485BPOS

Securities Act of 1933 Registration No. 002-69972

Investment Company Act of 1940 Registration No. 811-03114

SECURITIES AND EXCHANGE COMMISSION

Washington, D.C. 20549

FORM N-1A

REGISTRATION STATEMENT UNDER THE SECURITIES ACT OF 1933 x

o Pre-Effective Amendment No.  ______

x Post-Effective Amendment No.  131

and

REGISTRATION STATEMENT UNDER THE INVESTMENT COMPANY ACT OF 1940 x

x Amendment No.  131

Fidelity Select Portfolios

 (Exact Name of Registrant as Specified in Charter)

245 Summer Street, Boston, Massachusetts 02210

(Address of Principal Executive Offices)(Zip Code)

Registrant’s Telephone Number: 617-563-7000

Marc Bryant, Secretary

245 Summer Street

Boston, Massachusetts 02210

(Name and Address of Agent for Service)

It is proposed that this filing will become effective immediately upon filing pursuant to paragraph (b).

EXHIBIT INDEX

Exhibit	Exhibit No.
XBRL Instance Document	EX-101.INS
XBRL Taxonomy Extension Schema Document	EX-101.SCH
XBRL Taxonomy Extension Calculation Linkbase Document	EX-101.CAL
XBRL Taxonomy Extension Definition Linkbase Document	EX-101.DEF
XBRL Taxonomy Extension Labels Linkbase Document	EX-101.LAB
XBRL Taxonomy Extension Presentation Linkbase Document	EX-101.PRE

SIGNATURES

Pursuant to the requirements of the Securities Act of 1933 and the Investment Company Act of 1940, the Registrant certifies that it meets all of the requirements for the effectiveness of this Registration Statement pursuant to Rule 485(b) under the Securities Act of 1933 and has duly caused this Post-Effective Amendment No. 131 to the Registration Statement to be signed on its behalf by the undersigned, thereunto duly authorized, in the City of Boston, and Commonwealth of Massachusetts, on the 18th day of May 2017.

	Fidelity Select Portfolios
	By	/s/Adrien E. Deberghes
||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||		Adrien E. Deberghes, President

Pursuant to the requirements of the Securities Act of 1933, this Registration Statement has been signed below by the following persons in the capacities and on the dates indicated.

(Signature)		(Title)	(Date)
/s/Adrien E. Deberghes		President and Treasurer	May 18, 2017
Adrien E. Deberghes		(Principal Executive Officer)
/s/Howard J. Galligan III		Chief Financial Officer	May 18, 2017
Howard J. Galligan III		(Principal Financial Officer)
/s/Brian B. Hogan	*	Trustee	May 18, 2017
Brian B. Hogan
/s/David A. Rosow	*	Trustee	May 18, 2017
David A. Rosow
/s/Garnett A. Smith	*	Trustee	May 18, 2017
Garnett A. Smith
/s/Michael E. Wiley	*	Trustee	May 18, 2017
Michael E. Wiley

*	By:	/s/Megan C. Johnson
		Megan C. Johnson, pursuant to a power of attorney dated November 1, 2014 and filed herewith.

POWER OF ATTORNEY

We, the undersigned Directors or Trustees, as the case may be, of the following investment companies:

Fidelity Advisor Series VII Fidelity Covington Trust Fidelity Select Portfolios Variable Insurance Products Fund IV

in addition to any other investment company for which Fidelity SelectCo, LLC (“SelectCo”) or an affiliate acts as investment adviser and for which the undersigned individuals serve as Directors or Trustees (collectively, the “Funds”), hereby revoke all previous powers of attorney we have given to sign and otherwise act in our names and behalf in matters involving any investment company for which SelectCo or an affiliate acts as investment adviser and hereby constitute and appoint Thomas C. Bogle, Joseph R. Fleming, John V. O’Hanlon, Robert W. Helm, Megan C. Johnson, and Anthony H. Zacharski, each of them singly, our true and lawful attorneys-in-fact, with full power of substitution, and with full power to each of them, to sign for us and in our names in the appropriate capacities, all Registration Statements of the Funds on Form N-1A, or any successors thereto, any and all subsequent Amendments, Pre-Effective Amendments, or Post-Effective Amendments to said Registration Statements or any successors thereto, and any supplements or other instruments in connection therewith, and generally to do all such things in our names and behalf in connection therewith as said attorneys-in-fact deem necessary or appropriate, to comply with the provisions of the Securities Act of 1933 and the Investment Company Act of 1940, and all related requirements of the Securities and Exchange Commission.  We hereby ratify and confirm all that said attorneys-in-fact or their substitutes may do or cause to be done by virtue hereof.  This power of attorney is effective for all documents filed on or after November 1, 2014.

WITNESS our hands on this 1st day of November 2014.

/s/Brian B. Hogan	/s/Garnett A. Smith
Brian B. Hogan	Garnett A. Smith
/s/David A. Rosow	/s/Michael E. Wiley
David A. Rosow	Michael E. Wiley

XML

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Risk/Return:	rr_RiskReturnAbstract
Document Type	dei_DocumentType	485BPOS
Document Period End Date	dei_DocumentPeriodEndDate	Feb. 28, 2017
Registrant Name	dei_EntityRegistrantName	FIDELITY SELECT PORTFOLIOS
Central Index Key	dei_EntityCentralIndexKey	0000320351
Amendment Flag	dei_AmendmentFlag	false
Document Creation Date	dei_DocumentCreationDate	Apr. 27, 2017
Document Effective Date	dei_DocumentEffectiveDate	Apr. 29, 2017
Prospectus Date	rr_ProspectusDate	Apr. 29, 2017

XML

02.28 Select Portfolios: Group 3 Energy Sector Combo PRO-03 | Energy Portfolio

Fund Summary

Fund:
Energy Portfolio

Investment Objective

The fund seeks capital appreciation.

Fee Table

The following table describes the fees and expenses that may be incurred when you buy and hold shares of the fund.

Shareholder fees

Shareholder Fees {- Energy Portfolio}	02.28 Select Portfolios: Group 3 Energy Sector Combo PRO-03 Energy Portfolio USD ($)
(fees paid directly from your investment)	none

Annual Operating Expenses

(expenses that you pay each year as a % of the value of your investment)

Annual Operating Expenses {- Energy Portfolio}	02.28 Select Portfolios: Group 3 Energy Sector Combo PRO-03 Energy Portfolio Energy Portfolio-Default
Management fee	0.55%
Distribution and/or Service (12b-1) fees	none
Other expenses	0.24%
Total annual operating expenses	0.79%

This example helps compare the cost of investing in the fund with the cost of investing in other funds.

Let's say, hypothetically, that the annual return for shares of the fund is 5% and that your shareholder fees and the annual operating expenses for shares of the fund are exactly as described in the fee table. This example illustrates the effect of fees and expenses, but is not meant to suggest actual or expected fees and expenses or returns, all of which may vary. For every $10,000 you invested, here's how much you would pay in total expenses if you sell all of your shares at the end of each time period indicated:

Sell All Shares

Expense Example {- Energy Portfolio}	02.28 Select Portfolios: Group 3 Energy Sector Combo PRO-03 Energy Portfolio Energy Portfolio-Default USD ($)
1 year	$ 81
3 years	252
5 years	439
10 years	$ 978

Portfolio Turnover

The fund pays transaction costs, such as commissions, when it buys and sells securities (or "turns over" its portfolio). A higher portfolio turnover rate may indicate higher transaction costs and may result in higher taxes when fund shares are held in a taxable account. These costs, which are not reflected in annual operating expenses or in the example, affect the fund's performance. During the most recent fiscal year, the fund's portfolio turnover rate was 93% of the average value of its portfolio.

Principal Investment Strategies

• Normally investing primarily in common stocks.

• Normally investing at least 80% of assets in securities of companies principally engaged in the energy field, including the conventional areas of oil, gas, electricity, and coal, and newer sources of energy such as nuclear, geothermal, oil shale, and solar power.

• Investing in domestic and foreign issuers.

• Using fundamental analysis of factors such as each issuer's financial condition and industry position, as well as market and economic conditions, to select investments.

Principal Investment Risks

• Stock Market Volatility. Stock markets are volatile and can decline significantly in response to adverse issuer, political, regulatory, market, or economic developments. Different parts of the market, including different market sectors, and different types of securities can react differently to these developments.

• Foreign Exposure. Foreign markets can be more volatile than the U.S. market due to increased risks of adverse issuer, political, regulatory, market, or economic developments and can perform differently from the U.S. market.

• Energy Industry Concentration. The energy industries can be significantly affected by fluctuations in energy prices and supply and demand of energy fuels, energy conservation, the success of exploration projects, and tax and other government regulations.

• Issuer-Specific Changes. The value of an individual security or particular type of security can be more volatile than, and can perform differently from, the market as a whole. The value of securities of smaller issuers can be more volatile than that of larger issuers.

In addition, the fund is considered non-diversified and can invest a greater portion of assets in securities of a smaller number of individual issuers than a diversified fund. As a result, changes in the market value of a single investment could cause greater fluctuations in share price than would occur in a more diversified fund.

An investment in the fund is not a deposit of a bank and is not insured or guaranteed by the Federal Deposit Insurance Corporation or any other government agency. You could lose money by investing in the fund.

Performance

The following information is intended to help you understand the risks of investing in the fund. The information illustrates the changes in the performance of the fund's shares from year to year and compares the performance of the fund's shares to the performance of a securities market index and an additional index over various periods of time. The indexes have characteristics relevant to the fund's investment strategies. Index descriptions appear in the Additional Index Information section of the prospectus. Past performance (before and after taxes) is not an indication of future performance.

Visit www.fidelity.com for more recent performance information.

Year-by-Year Returns

Calendar Years

During the periods shown in the chart:	Returns	Quarter ended
Highest Quarter Return	24.43%	December 31, 2010
Lowest Quarter Return	-37.94%	September 30, 2008
Year-to-Date Return	-6.42%	March 31, 2017

Average Annual Returns

After-tax returns are calculated using the historical highest individual federal marginal income tax rates, but do not reflect the impact of state or local taxes. Actual after-tax returns may differ depending on your individual circumstances. The after-tax returns shown are not relevant if you hold your shares in a retirement account or in another tax-deferred arrangement, such as an employee benefit plan (profit sharing, 401(k), or 403(b) plan). Return After Taxes on Distributions and Sale of Fund Shares may be higher than other returns for the same period due to a tax benefit of realizing a capital loss upon the sale of fund shares.

For the periods ended December 31, 2016

Average Annual Total Returns{- Energy Portfolio} - 02.28 Select Portfolios: Group 3 Energy Sector Combo PRO-03 - Energy Portfolio	Past 1 year	Past 5 years	Past 10 years
Energy Portfolio-Default | Return Before Taxes	33.84%	3.84%	3.02%
Energy Portfolio-Default | After Taxes on Distributions	33.63%	2.65%	2.28%
Energy Portfolio-Default | After Taxes on Distributions and Sales	19.30%	2.96%	2.45%
S&P 500® Index(reflects no deduction for fees, expenses, or taxes)	11.96%	14.66%	6.95%
MSCI U.S. IMI Energy 25-50 Index(reflects no deduction for fees, expenses, or taxes)	29.56%	3.18%	4.01%

XML

Label

Element

Value

Risk/Return:

rr_RiskReturnAbstract

Registrant Name

dei_EntityRegistrantName

FIDELITY SELECT PORTFOLIOS

Prospectus Date

rr_ProspectusDate

Apr. 29, 2017

02.28 Select Portfolios: Group 3 Energy Sector Combo PRO-03 | Energy Portfolio

Risk/Return:

rr_RiskReturnAbstract

Risk/Return [Heading]

rr_RiskReturnHeading

Fund Summary

Fund:
Energy Portfolio

Objective [Heading]

rr_ObjectiveHeading

Investment Objective

Objective, Primary [Text Block]

rr_ObjectivePrimaryTextBlock

The fund seeks capital appreciation.

Expense [Heading]

rr_ExpenseHeading

Fee Table

Expense Narrative [Text Block]

rr_ExpenseNarrativeTextBlock

The following table describes the fees and expenses that may be incurred when you buy and hold shares of the fund.

Shareholder Fees Caption [Text]

rr_ShareholderFeesCaption

Shareholder fees

(fees paid directly from your investment)

rr_ShareholderFeeOther

none

Operating Expenses Caption [Text]

rr_OperatingExpensesCaption

Annual Operating Expenses

(expenses that you pay each year as a % of the value of your investment)

Portfolio Turnover [Heading]

rr_PortfolioTurnoverHeading

Portfolio Turnover

Portfolio Turnover [Text Block]

rr_PortfolioTurnoverTextBlock

The fund pays transaction costs, such as commissions, when it buys and sells securities (or "turns over" its portfolio). A higher portfolio turnover rate may indicate higher transaction costs and may result in higher taxes when fund shares are held in a taxable account. These costs, which are not reflected in annual operating expenses or in the example, affect the fund's performance. During the most recent fiscal year, the fund's portfolio turnover rate was 93% of the average value of its portfolio.

Portfolio Turnover, Rate

rr_PortfolioTurnoverRate

93.00%

Expense Example Narrative [Text Block]

rr_ExpenseExampleNarrativeTextBlock

This example helps compare the cost of investing in the fund with the cost of investing in other funds.

Let's say, hypothetically, that the annual return for shares of the fund is 5% and that your shareholder fees and the annual operating expenses for shares of the fund are exactly as described in the fee table. This example illustrates the effect of fees and expenses, but is not meant to suggest actual or expected fees and expenses or returns, all of which may vary. For every $10,000 you invested, here's how much you would pay in total expenses if you sell all of your shares at the end of each time period indicated:

Expense Example by, Year, Caption [Text]

rr_ExpenseExampleByYearCaption

Sell All Shares

Strategy [Heading]

rr_StrategyHeading

Principal Investment Strategies

Strategy Narrative [Text Block]

rr_StrategyNarrativeTextBlock

• Normally investing primarily in common stocks.

• Normally investing at least 80% of assets in securities of companies principally engaged in the energy field, including the conventional areas of oil, gas, electricity, and coal, and newer sources of energy such as nuclear, geothermal, oil shale, and solar power.

• Investing in domestic and foreign issuers.

• Using fundamental analysis of factors such as each issuer's financial condition and industry position, as well as market and economic conditions, to select investments.

Strategy Portfolio Concentration [Text]

rr_StrategyPortfolioConcentration

Normally investing at least 80% of assets in securities of companies principally engaged in the energy field, including the conventional areas of oil, gas, electricity, and coal, and newer sources of energy such as nuclear, geothermal, oil shale, and solar power.

Risk [Heading]

rr_RiskHeading

Principal Investment Risks

Risk Narrative [Text Block]

rr_RiskNarrativeTextBlock

• Stock Market Volatility. Stock markets are volatile and can decline significantly in response to adverse issuer, political, regulatory, market, or economic developments. Different parts of the market, including different market sectors, and different types of securities can react differently to these developments.

• Foreign Exposure. Foreign markets can be more volatile than the U.S. market due to increased risks of adverse issuer, political, regulatory, market, or economic developments and can perform differently from the U.S. market.

• Energy Industry Concentration. The energy industries can be significantly affected by fluctuations in energy prices and supply and demand of energy fuels, energy conservation, the success of exploration projects, and tax and other government regulations.

• Issuer-Specific Changes. The value of an individual security or particular type of security can be more volatile than, and can perform differently from, the market as a whole. The value of securities of smaller issuers can be more volatile than that of larger issuers.

In addition, the fund is considered non-diversified and can invest a greater portion of assets in securities of a smaller number of individual issuers than a diversified fund. As a result, changes in the market value of a single investment could cause greater fluctuations in share price than would occur in a more diversified fund.

An investment in the fund is not a deposit of a bank and is not insured or guaranteed by the Federal Deposit Insurance Corporation or any other government agency. You could lose money by investing in the fund.

Risk Lose Money [Text]

rr_RiskLoseMoney

You could lose money by investing in the fund.

Risk Nondiversified Status [Text]

rr_RiskNondiversifiedStatus

In addition, the fund is considered non-diversified and can invest a greater portion of assets in securities of a smaller number of individual issuers than a diversified fund. As a result, changes in the market value of a single investment could cause greater fluctuations in share price than would occur in a more diversified fund.

Risk Not Insured Depository Institution [Text]

rr_RiskNotInsuredDepositoryInstitution

An investment in the fund is not a deposit of a bank and is not insured or guaranteed by the Federal Deposit Insurance Corporation or any other government agency.

Bar Chart and Performance Table [Heading]

rr_BarChartAndPerformanceTableHeading

Performance

Performance Narrative [Text Block]

rr_PerformanceNarrativeTextBlock

The following information is intended to help you understand the risks of investing in the fund. The information illustrates the changes in the performance of the fund's shares from year to year and compares the performance of the fund's shares to the performance of a securities market index and an additional index over various periods of time. The indexes have characteristics relevant to the fund's investment strategies. Index descriptions appear in the Additional Index Information section of the prospectus. Past performance (before and after taxes) is not an indication of future performance.

Visit www.fidelity.com for more recent performance information.

Performance Information Illustrates Variability of Returns [Text]

rr_PerformanceInformationIllustratesVariabilityOfReturns

The information illustrates the changes in the performance of the fund's shares from year to year and compares the performance of the fund's shares to the performance of a securities market index and an additional index over various periods of time.

Performance Availability Website Address [Text]

rr_PerformanceAvailabilityWebSiteAddress

www.fidelity.com

Performance Past Does Not Indicate Future [Text]

rr_PerformancePastDoesNotIndicateFuture

Past performance (before and after taxes) is not an indication of future performance.

Bar Chart [Heading]

rr_BarChartHeading

Year-by-Year Returns

Calendar Years

Bar Chart Closing [Text Block]

rr_BarChartClosingTextBlock

During the periods shown in the chart:	Returns	Quarter ended
Highest Quarter Return	24.43%	December 31, 2010
Lowest Quarter Return	-37.94%	September 30, 2008
Year-to-Date Return	-6.42%	March 31, 2017

Performance Table Heading

rr_PerformanceTableHeading

Average Annual Returns

Performance Table Uses Highest Federal Rate

rr_PerformanceTableUsesHighestFederalRate

After-tax returns are calculated using the historical highest individual federal marginal income tax rates, but do not reflect the impact of state or local taxes.

Performance Table Not Relevant to Tax Deferred

rr_PerformanceTableNotRelevantToTaxDeferred

The after-tax returns shown are not relevant if you hold your shares in a retirement account or in another tax-deferred arrangement, such as an employee benefit plan (profit sharing, 401(k), or 403(b) plan).

Performance Table Explanation after Tax Higher

rr_PerformanceTableExplanationAfterTaxHigher

Return After Taxes on Distributions and Sale of Fund Shares may be higher than other returns for the same period due to a tax benefit of realizing a capital loss upon the sale of fund shares.

Performance Table Narrative

rr_PerformanceTableNarrativeTextBlock

After-tax returns are calculated using the historical highest individual federal marginal income tax rates, but do not reflect the impact of state or local taxes. Actual after-tax returns may differ depending on your individual circumstances. The after-tax returns shown are not relevant if you hold your shares in a retirement account or in another tax-deferred arrangement, such as an employee benefit plan (profit sharing, 401(k), or 403(b) plan). Return After Taxes on Distributions and Sale of Fund Shares may be higher than other returns for the same period due to a tax benefit of realizing a capital loss upon the sale of fund shares.

For the periods ended December 31, 2016

02.28 Select Portfolios: Group 3 Energy Sector Combo PRO-03 | Energy Portfolio | Energy Portfolio-Default

Risk/Return:

rr_RiskReturnAbstract

Management fee

rr_ManagementFeesOverAssets

0.55%

Distribution and/or Service (12b-1) fees

rr_DistributionAndService12b1FeesOverAssets

none

Other expenses

rr_OtherExpensesOverAssets

0.24%

Total annual operating expenses

rr_ExpensesOverAssets

0.79%

1 year

rr_ExpenseExampleYear01

$ 81

3 years

rr_ExpenseExampleYear03

252

5 years

rr_ExpenseExampleYear05

439

10 years

rr_ExpenseExampleYear10

$ 978

2007

rr_AnnualReturn2007

45.53%

2008

rr_AnnualReturn2008

(54.00%)

2009

rr_AnnualReturn2009

47.09%

2010

rr_AnnualReturn2010

18.99%

2011

rr_AnnualReturn2011

(4.85%)

2012

rr_AnnualReturn2012

4.64%

2013

rr_AnnualReturn2013

24.21%

2014

rr_AnnualReturn2014

(12.64%)

2015

rr_AnnualReturn2015

(20.53%)

2016

rr_AnnualReturn2016

33.84%

Year to Date Return, Label

rr_YearToDateReturnLabel

Year-to-Date Return

Bar Chart, Year to Date Return, Date

rr_BarChartYearToDateReturnDate

Mar. 31, 2017

Bar Chart, Year to Date Return

rr_BarChartYearToDateReturn

(6.42%)

Highest Quarterly Return, Label

rr_HighestQuarterlyReturnLabel

Highest Quarter Return

Highest Quarterly Return, Date

rr_BarChartHighestQuarterlyReturnDate

Dec. 31, 2010

Highest Quarterly Return

rr_BarChartHighestQuarterlyReturn

24.43%

Lowest Quarterly Return, Label

rr_LowestQuarterlyReturnLabel

Lowest Quarter Return

Lowest Quarterly Return, Date

rr_BarChartLowestQuarterlyReturnDate

Sep. 30, 2008

Lowest Quarterly Return

rr_BarChartLowestQuarterlyReturn

(37.94%)

02.28 Select Portfolios: Group 3 Energy Sector Combo PRO-03 | Energy Portfolio | Return Before Taxes | Energy Portfolio-Default

Risk/Return:

rr_RiskReturnAbstract

Column

rr_AverageAnnualReturnColumnName

Energy Portfolio

Label

rr_AverageAnnualReturnLabel

Return Before Taxes

Past 1 year

rr_AverageAnnualReturnYear01

33.84%

Past 5 years

rr_AverageAnnualReturnYear05

3.84%

Past 10 years

rr_AverageAnnualReturnYear10

3.02%

02.28 Select Portfolios: Group 3 Energy Sector Combo PRO-03 | Energy Portfolio | After Taxes on Distributions | Energy Portfolio-Default

Risk/Return:

rr_RiskReturnAbstract

Column

rr_AverageAnnualReturnColumnName

Energy Portfolio

Label

rr_AverageAnnualReturnLabel

Return After Taxes on Distributions

Past 1 year

rr_AverageAnnualReturnYear01

33.63%

Past 5 years

rr_AverageAnnualReturnYear05

2.65%

Past 10 years

rr_AverageAnnualReturnYear10

2.28%

02.28 Select Portfolios: Group 3 Energy Sector Combo PRO-03 | Energy Portfolio | After Taxes on Distributions and Sales | Energy Portfolio-Default

Risk/Return:

rr_RiskReturnAbstract

Column

rr_AverageAnnualReturnColumnName

Energy Portfolio

Label

rr_AverageAnnualReturnLabel

Return After Taxes on Distributions and Sale of Fund Shares

Past 1 year

rr_AverageAnnualReturnYear01

19.30%

Past 5 years

rr_AverageAnnualReturnYear05

2.96%

Past 10 years

rr_AverageAnnualReturnYear10

2.45%

02.28 Select Portfolios: Group 3 Energy Sector Combo PRO-03 | Energy Portfolio | S&P 500® Index(reflects no deduction for fees, expenses, or taxes)

Risk/Return:

rr_RiskReturnAbstract

Past 1 year

rr_AverageAnnualReturnYear01

11.96%

Past 5 years

rr_AverageAnnualReturnYear05

14.66%

Past 10 years

rr_AverageAnnualReturnYear10

6.95%

02.28 Select Portfolios: Group 3 Energy Sector Combo PRO-03 | Energy Portfolio | MSCI U.S. IMI Energy 25-50 Index(reflects no deduction for fees, expenses, or taxes)

Risk/Return:

rr_RiskReturnAbstract

Past 1 year

rr_AverageAnnualReturnYear01

29.56%

Past 5 years

rr_AverageAnnualReturnYear05

3.18%

Past 10 years

rr_AverageAnnualReturnYear10

4.01%

XML

02.28 Select Portfolios: Group 3 Energy Sector Combo PRO-03 | Energy Service Portfolio

Fund Summary

Fund:
Energy Service Portfolio

Investment Objective

The fund seeks capital appreciation.

Fee Table

The following table describes the fees and expenses that may be incurred when you buy and hold shares of the fund.

Shareholder fees

(fees paid directly from your investment)

Shareholder Fees {- Energy Service Portfolio}	02.28 Select Portfolios: Group 3 Energy Sector Combo PRO-03 Energy Service Portfolio Energy Service Portfolio-Default
Redemption fee on shares held less than 30 days (as a % of amount redeemed)	0.75%

Annual Operating Expenses

(expenses that you pay each year as a % of the value of your investment)

Annual Operating Expenses {- Energy Service Portfolio}	02.28 Select Portfolios: Group 3 Energy Sector Combo PRO-03 Energy Service Portfolio Energy Service Portfolio-Default
Management fee	0.55%
Distribution and/or Service (12b-1) fees	none
Other expenses	0.30%
Total annual operating expenses	0.85%

This example helps compare the cost of investing in the fund with the cost of investing in other funds.

Let's say, hypothetically, that the annual return for shares of the fund is 5% and that your shareholder fees and the annual operating expenses for shares of the fund are exactly as described in the fee table. This example illustrates the effect of fees and expenses, but is not meant to suggest actual or expected fees and expenses or returns, all of which may vary. For every $10,000 you invested, here's how much you would pay in total expenses if you sell all of your shares at the end of each time period indicated:

Sell All Shares

Expense Example {- Energy Service Portfolio}	02.28 Select Portfolios: Group 3 Energy Sector Combo PRO-03 Energy Service Portfolio Energy Service Portfolio-Default USD ($)
1 year	$ 87
3 years	271
5 years	471
10 years	$ 1,049

Portfolio Turnover

The fund pays transaction costs, such as commissions, when it buys and sells securities (or "turns over" its portfolio). A higher portfolio turnover rate may indicate higher transaction costs and may result in higher taxes when fund shares are held in a taxable account. These costs, which are not reflected in annual operating expenses or in the example, affect the fund's performance. During the most recent fiscal year, the fund's portfolio turnover rate was 96% of the average value of its portfolio.

Principal Investment Strategies

• Normally investing primarily in common stocks.

• Normally investing at least 80% of assets in securities of companies principally engaged in the energy service field, including those that provide services and equipment to the conventional areas of oil, gas, electricity, and coal, and newer sources of energy such as nuclear, geothermal, oil shale, and solar power.

• Investing in domestic and foreign issuers.

• Using fundamental analysis of factors such as each issuer's financial condition and industry position, as well as market and economic conditions, to select investments.

Principal Investment Risks

• Stock Market Volatility. Stock markets are volatile and can decline significantly in response to adverse issuer, political, regulatory, market, or economic developments. Different parts of the market, including different market sectors, and different types of securities can react differently to these developments.

• Foreign Exposure. Foreign markets can be more volatile than the U.S. market due to increased risks of adverse issuer, political, regulatory, market, or economic developments and can perform differently from the U.S. market.

• Energy Service Industry Concentration. The energy service industry can be significantly affected by the supply of and demand for specific equipment or services, the supply of and demand for oil and gas, the price of oil and gas, exploration and production spending, government regulation, world events, and economic conditions.

• Issuer-Specific Changes. The value of an individual security or particular type of security can be more volatile than, and can perform differently from, the market as a whole. The value of securities of smaller issuers can be more volatile than that of larger issuers.

In addition, the fund is considered non-diversified and can invest a greater portion of assets in securities of a smaller number of individual issuers than a diversified fund. As a result, changes in the market value of a single investment could cause greater fluctuations in share price than would occur in a more diversified fund.

An investment in the fund is not a deposit of a bank and is not insured or guaranteed by the Federal Deposit Insurance Corporation or any other government agency. You could lose money by investing in the fund.

Performance

The following information is intended to help you understand the risks of investing in the fund. The information illustrates the changes in the performance of the fund's shares from year to year and compares the performance of the fund's shares to the performance of a securities market index and an additional index over various periods of time. The indexes have characteristics relevant to the fund's investment strategies. Index descriptions appear in the Additional Index Information section of the prospectus. Past performance (before and after taxes) is not an indication of future performance.

Visit www.fidelity.com for more recent performance information.

Year-by-Year Returns

Calendar Years

During the periods shown in the chart:	Returns	Quarter ended
Highest Quarter Return	31.42%	June 30, 2009
Lowest Quarter Return	-50.71%	December 31, 2008
Year-to-Date Return	-4.39%	March 31, 2017

Average Annual Returns

After-tax returns are calculated using the historical highest individual federal marginal income tax rates, but do not reflect the impact of state or local taxes. Actual after-tax returns may differ depending on your individual circumstances. The after-tax returns shown are not relevant if you hold your shares in a retirement account or in another tax-deferred arrangement, such as an employee benefit plan (profit sharing, 401(k), or 403(b) plan). Return After Taxes on Distributions and Sale of Fund Shares may be higher than other returns for the same period due to a tax benefit of realizing a capital loss upon the sale of fund shares.

For the periods ended December 31, 2016

Average Annual Total Returns{- Energy Service Portfolio} - 02.28 Select Portfolios: Group 3 Energy Sector Combo PRO-03 - Energy Service Portfolio	Past 1 year	Past 5 years	Past 10 years
Energy Service Portfolio-Default | Return Before Taxes	36.57%	(0.06%)	0.32%
Energy Service Portfolio-Default | After Taxes on Distributions	36.42%	(0.75%)	(0.13%)
Energy Service Portfolio-Default | After Taxes on Distributions and Sales	20.80%	none	0.38%
S&P 500® Index(reflects no deduction for fees, expenses, or taxes)	11.96%	14.66%	6.95%
MSCI U.S. IMI Energy Equipment & Services 25-50 Index(reflects no deduction for fees, expenses, or taxes)	34.70%	(0.17%)	1.31%

XML

Label

Element

Value

Risk/Return:

rr_RiskReturnAbstract

Registrant Name

dei_EntityRegistrantName

FIDELITY SELECT PORTFOLIOS

Prospectus Date

rr_ProspectusDate

Apr. 29, 2017

02.28 Select Portfolios: Group 3 Energy Sector Combo PRO-03 | Energy Service Portfolio

Risk/Return:

rr_RiskReturnAbstract

Risk/Return [Heading]

rr_RiskReturnHeading

Fund Summary

Fund:
Energy Service Portfolio

Objective [Heading]

rr_ObjectiveHeading

Investment Objective

Objective, Primary [Text Block]

rr_ObjectivePrimaryTextBlock

The fund seeks capital appreciation.

Expense [Heading]

rr_ExpenseHeading

Fee Table

Expense Narrative [Text Block]

rr_ExpenseNarrativeTextBlock

The following table describes the fees and expenses that may be incurred when you buy and hold shares of the fund.

Shareholder Fees Caption [Text]

rr_ShareholderFeesCaption

Shareholder fees

(fees paid directly from your investment)

Operating Expenses Caption [Text]

rr_OperatingExpensesCaption

Annual Operating Expenses

(expenses that you pay each year as a % of the value of your investment)

Portfolio Turnover [Heading]

rr_PortfolioTurnoverHeading

Portfolio Turnover

Portfolio Turnover [Text Block]

rr_PortfolioTurnoverTextBlock

The fund pays transaction costs, such as commissions, when it buys and sells securities (or "turns over" its portfolio). A higher portfolio turnover rate may indicate higher transaction costs and may result in higher taxes when fund shares are held in a taxable account. These costs, which are not reflected in annual operating expenses or in the example, affect the fund's performance. During the most recent fiscal year, the fund's portfolio turnover rate was 96% of the average value of its portfolio.

Portfolio Turnover, Rate

rr_PortfolioTurnoverRate

96.00%

Expense Example Narrative [Text Block]

rr_ExpenseExampleNarrativeTextBlock

This example helps compare the cost of investing in the fund with the cost of investing in other funds.

Let's say, hypothetically, that the annual return for shares of the fund is 5% and that your shareholder fees and the annual operating expenses for shares of the fund are exactly as described in the fee table. This example illustrates the effect of fees and expenses, but is not meant to suggest actual or expected fees and expenses or returns, all of which may vary. For every $10,000 you invested, here's how much you would pay in total expenses if you sell all of your shares at the end of each time period indicated:

Expense Example by, Year, Caption [Text]

rr_ExpenseExampleByYearCaption

Sell All Shares

Strategy [Heading]

rr_StrategyHeading

Principal Investment Strategies

Strategy Narrative [Text Block]

rr_StrategyNarrativeTextBlock

• Normally investing primarily in common stocks.

• Normally investing at least 80% of assets in securities of companies principally engaged in the energy service field, including those that provide services and equipment to the conventional areas of oil, gas, electricity, and coal, and newer sources of energy such as nuclear, geothermal, oil shale, and solar power.

• Investing in domestic and foreign issuers.

• Using fundamental analysis of factors such as each issuer's financial condition and industry position, as well as market and economic conditions, to select investments.

Strategy Portfolio Concentration [Text]

rr_StrategyPortfolioConcentration

Normally investing at least 80% of assets in securities of companies principally engaged in the energy service field, including those that provide services and equipment to the conventional areas of oil, gas, electricity, and coal, and newer sources of energy such as nuclear, geothermal, oil shale, and solar power.

Risk [Heading]

rr_RiskHeading

Principal Investment Risks

Risk Narrative [Text Block]

rr_RiskNarrativeTextBlock

• Stock Market Volatility. Stock markets are volatile and can decline significantly in response to adverse issuer, political, regulatory, market, or economic developments. Different parts of the market, including different market sectors, and different types of securities can react differently to these developments.

• Foreign Exposure. Foreign markets can be more volatile than the U.S. market due to increased risks of adverse issuer, political, regulatory, market, or economic developments and can perform differently from the U.S. market.

• Energy Service Industry Concentration. The energy service industry can be significantly affected by the supply of and demand for specific equipment or services, the supply of and demand for oil and gas, the price of oil and gas, exploration and production spending, government regulation, world events, and economic conditions.

• Issuer-Specific Changes. The value of an individual security or particular type of security can be more volatile than, and can perform differently from, the market as a whole. The value of securities of smaller issuers can be more volatile than that of larger issuers.

In addition, the fund is considered non-diversified and can invest a greater portion of assets in securities of a smaller number of individual issuers than a diversified fund. As a result, changes in the market value of a single investment could cause greater fluctuations in share price than would occur in a more diversified fund.

An investment in the fund is not a deposit of a bank and is not insured or guaranteed by the Federal Deposit Insurance Corporation or any other government agency. You could lose money by investing in the fund.

Risk Lose Money [Text]

rr_RiskLoseMoney

You could lose money by investing in the fund.

Risk Nondiversified Status [Text]

rr_RiskNondiversifiedStatus

In addition, the fund is considered non-diversified and can invest a greater portion of assets in securities of a smaller number of individual issuers than a diversified fund. As a result, changes in the market value of a single investment could cause greater fluctuations in share price than would occur in a more diversified fund.

Risk Not Insured Depository Institution [Text]

rr_RiskNotInsuredDepositoryInstitution

An investment in the fund is not a deposit of a bank and is not insured or guaranteed by the Federal Deposit Insurance Corporation or any other government agency.

Bar Chart and Performance Table [Heading]

rr_BarChartAndPerformanceTableHeading

Performance

Performance Narrative [Text Block]

rr_PerformanceNarrativeTextBlock

The following information is intended to help you understand the risks of investing in the fund. The information illustrates the changes in the performance of the fund's shares from year to year and compares the performance of the fund's shares to the performance of a securities market index and an additional index over various periods of time. The indexes have characteristics relevant to the fund's investment strategies. Index descriptions appear in the Additional Index Information section of the prospectus. Past performance (before and after taxes) is not an indication of future performance.

Visit www.fidelity.com for more recent performance information.

Performance Information Illustrates Variability of Returns [Text]

rr_PerformanceInformationIllustratesVariabilityOfReturns

The information illustrates the changes in the performance of the fund's shares from year to year and compares the performance of the fund's shares to the performance of a securities market index and an additional index over various periods of time.

Performance Availability Website Address [Text]

rr_PerformanceAvailabilityWebSiteAddress

www.fidelity.com

Performance Past Does Not Indicate Future [Text]

rr_PerformancePastDoesNotIndicateFuture

Past performance (before and after taxes) is not an indication of future performance.

Bar Chart [Heading]

rr_BarChartHeading

Year-by-Year Returns

Calendar Years

Bar Chart Closing [Text Block]

rr_BarChartClosingTextBlock

During the periods shown in the chart:	Returns	Quarter ended
Highest Quarter Return	31.42%	June 30, 2009
Lowest Quarter Return	-50.71%	December 31, 2008
Year-to-Date Return	-4.39%	March 31, 2017

Performance Table Heading

rr_PerformanceTableHeading

Average Annual Returns

Performance Table Uses Highest Federal Rate

rr_PerformanceTableUsesHighestFederalRate

After-tax returns are calculated using the historical highest individual federal marginal income tax rates, but do not reflect the impact of state or local taxes.

Performance Table Not Relevant to Tax Deferred

rr_PerformanceTableNotRelevantToTaxDeferred

The after-tax returns shown are not relevant if you hold your shares in a retirement account or in another tax-deferred arrangement, such as an employee benefit plan (profit sharing, 401(k), or 403(b) plan).

Performance Table Explanation after Tax Higher

rr_PerformanceTableExplanationAfterTaxHigher

Return After Taxes on Distributions and Sale of Fund Shares may be higher than other returns for the same period due to a tax benefit of realizing a capital loss upon the sale of fund shares.

Performance Table Narrative

rr_PerformanceTableNarrativeTextBlock

After-tax returns are calculated using the historical highest individual federal marginal income tax rates, but do not reflect the impact of state or local taxes. Actual after-tax returns may differ depending on your individual circumstances. The after-tax returns shown are not relevant if you hold your shares in a retirement account or in another tax-deferred arrangement, such as an employee benefit plan (profit sharing, 401(k), or 403(b) plan). Return After Taxes on Distributions and Sale of Fund Shares may be higher than other returns for the same period due to a tax benefit of realizing a capital loss upon the sale of fund shares.

For the periods ended December 31, 2016

02.28 Select Portfolios: Group 3 Energy Sector Combo PRO-03 | Energy Service Portfolio | Energy Service Portfolio-Default

Risk/Return:

rr_RiskReturnAbstract

Redemption fee on shares held less than 30 days (as a % of amount redeemed)

rr_RedemptionFeeOverRedemption

0.75%

Management fee

rr_ManagementFeesOverAssets

0.55%

Distribution and/or Service (12b-1) fees

rr_DistributionAndService12b1FeesOverAssets

none

Other expenses

rr_OtherExpensesOverAssets

0.30%

Total annual operating expenses

rr_ExpensesOverAssets

0.85%

1 year

rr_ExpenseExampleYear01

$ 87

3 years

rr_ExpenseExampleYear03

271

5 years

rr_ExpenseExampleYear05

471

10 years

rr_ExpenseExampleYear10

$ 1,049

2007

rr_AnnualReturn2007

55.21%

2008

rr_AnnualReturn2008

(63.16%)

2009

rr_AnnualReturn2009

61.96%

2010

rr_AnnualReturn2010

27.92%

2011

rr_AnnualReturn2011

(12.56%)

2012

rr_AnnualReturn2012

2.57%

2013

rr_AnnualReturn2013

27.48%

2014

rr_AnnualReturn2014

(24.13%)

2015

rr_AnnualReturn2015

(26.41%)

2016

rr_AnnualReturn2016

36.57%

Year to Date Return, Label

rr_YearToDateReturnLabel

Year-to-Date Return

Bar Chart, Year to Date Return, Date

rr_BarChartYearToDateReturnDate

Mar. 31, 2017

Bar Chart, Year to Date Return

rr_BarChartYearToDateReturn

(4.39%)

Highest Quarterly Return, Label

rr_HighestQuarterlyReturnLabel

Highest Quarter Return

Highest Quarterly Return, Date

rr_BarChartHighestQuarterlyReturnDate

Jun. 30, 2009

Highest Quarterly Return

rr_BarChartHighestQuarterlyReturn

31.42%

Lowest Quarterly Return, Label

rr_LowestQuarterlyReturnLabel

Lowest Quarter Return

Lowest Quarterly Return, Date

rr_BarChartLowestQuarterlyReturnDate

Dec. 31, 2008

Lowest Quarterly Return

rr_BarChartLowestQuarterlyReturn

(50.71%)

02.28 Select Portfolios: Group 3 Energy Sector Combo PRO-03 | Energy Service Portfolio | Return Before Taxes | Energy Service Portfolio-Default

Risk/Return:

rr_RiskReturnAbstract

Column

rr_AverageAnnualReturnColumnName

Energy Service Portfolio

Label

rr_AverageAnnualReturnLabel

Return Before Taxes

Past 1 year

rr_AverageAnnualReturnYear01

36.57%

Past 5 years

rr_AverageAnnualReturnYear05

(0.06%)

Past 10 years

rr_AverageAnnualReturnYear10

0.32%

02.28 Select Portfolios: Group 3 Energy Sector Combo PRO-03 | Energy Service Portfolio | After Taxes on Distributions | Energy Service Portfolio-Default

Risk/Return:

rr_RiskReturnAbstract

Column

rr_AverageAnnualReturnColumnName

Energy Service Portfolio

Label

rr_AverageAnnualReturnLabel

Return After Taxes on Distributions

Past 1 year

rr_AverageAnnualReturnYear01

36.42%

Past 5 years

rr_AverageAnnualReturnYear05

(0.75%)

Past 10 years

rr_AverageAnnualReturnYear10

(0.13%)

02.28 Select Portfolios: Group 3 Energy Sector Combo PRO-03 | Energy Service Portfolio | After Taxes on Distributions and Sales | Energy Service Portfolio-Default

Risk/Return:

rr_RiskReturnAbstract

Column

rr_AverageAnnualReturnColumnName

Energy Service Portfolio

Label

rr_AverageAnnualReturnLabel

Return After Taxes on Distributions and Sale of Fund Shares

Past 1 year

rr_AverageAnnualReturnYear01

20.80%

Past 5 years

rr_AverageAnnualReturnYear05

none

Past 10 years

rr_AverageAnnualReturnYear10

0.38%

02.28 Select Portfolios: Group 3 Energy Sector Combo PRO-03 | Energy Service Portfolio | S&P 500® Index(reflects no deduction for fees, expenses, or taxes)

Risk/Return:

rr_RiskReturnAbstract

Past 1 year

rr_AverageAnnualReturnYear01

11.96%

Past 5 years

rr_AverageAnnualReturnYear05

14.66%

Past 10 years

rr_AverageAnnualReturnYear10

6.95%

02.28 Select Portfolios: Group 3 Energy Sector Combo PRO-03 | Energy Service Portfolio | MSCI U.S. IMI Energy Equipment & Services 25-50 Index(reflects no deduction for fees, expenses, or taxes)

Risk/Return:

rr_RiskReturnAbstract

Past 1 year

rr_AverageAnnualReturnYear01

34.70%

Past 5 years

rr_AverageAnnualReturnYear05

(0.17%)

Past 10 years

rr_AverageAnnualReturnYear10

1.31%

XML

02.28 Select Portfolios: Group 3 Energy Sector Combo PRO-03 | Natural Gas Portfolio

Fund Summary

Fund:
Natural Gas Portfolio

Investment Objective

The fund seeks capital appreciation.

Fee Table

The following table describes the fees and expenses that may be incurred when you buy and hold shares of the fund.

Shareholder fees

(fees paid directly from your investment)

Shareholder Fees {- Natural Gas Portfolio}	02.28 Select Portfolios: Group 3 Energy Sector Combo PRO-03 Natural Gas Portfolio Natural Gas Portfolio-Default
Redemption fee on shares held less than 30 days (as a % of amount redeemed)	0.75%

Annual Operating Expenses

(expenses that you pay each year as a % of the value of your investment)

Annual Operating Expenses {- Natural Gas Portfolio}	02.28 Select Portfolios: Group 3 Energy Sector Combo PRO-03 Natural Gas Portfolio Natural Gas Portfolio-Default
Management fee	0.55%
Distribution and/or Service (12b-1) fees	none
Other expenses	0.32%
Total annual operating expenses	0.87%

This example helps compare the cost of investing in the fund with the cost of investing in other funds.

Let's say, hypothetically, that the annual return for shares of the fund is 5% and that your shareholder fees and the annual operating expenses for shares of the fund are exactly as described in the fee table. This example illustrates the effect of fees and expenses, but is not meant to suggest actual or expected fees and expenses or returns, all of which may vary. For every $10,000 you invested, here's how much you would pay in total expenses if you sell all of your shares at the end of each time period indicated:

Sell All Shares

Expense Example {- Natural Gas Portfolio}	02.28 Select Portfolios: Group 3 Energy Sector Combo PRO-03 Natural Gas Portfolio Natural Gas Portfolio-Default USD ($)
1 year	$ 89
3 years	278
5 years	482
10 years	$ 1,073

Portfolio Turnover

The fund pays transaction costs, such as commissions, when it buys and sells securities (or "turns over" its portfolio). A higher portfolio turnover rate may indicate higher transaction costs and may result in higher taxes when fund shares are held in a taxable account. These costs, which are not reflected in annual operating expenses or in the example, affect the fund's performance. During the most recent fiscal year, the fund's portfolio turnover rate was 76% of the average value of its portfolio.

Principal Investment Strategies

• Normally investing primarily in common stocks.

• Normally investing at least 80% of assets in securities of companies principally engaged in the production, transmission, and distribution of natural gas, and involved in the exploration of potential natural gas sources, as well as those companies that provide services and equipment to natural gas producers, refineries, cogeneration facilities, converters, and distributors.

• Investing in domestic and foreign issuers.

• Using fundamental analysis of factors such as each issuer's financial condition and industry position, as well as market and economic conditions, to select investments.

Principal Investment Risks

• Stock Market Volatility. Stock markets are volatile and can decline significantly in response to adverse issuer, political, regulatory, market, or economic developments. Different parts of the market, including different market sectors, and different types of securities can react differently to these developments.

• Foreign Exposure. Foreign markets can be more volatile than the U.S. market due to increased risks of adverse issuer, political, regulatory, market, or economic developments and can perform differently from the U.S. market.

• Natural Gas Industry Concentration. The natural gas industry is subject to changes in price and supply of energy sources and can be significantly affected by events relating to international politics, energy conservation, the success of energy source exploration projects, and tax and other government regulations.

• Issuer-Specific Changes. The value of an individual security or particular type of security can be more volatile than, and can perform differently from, the market as a whole. The value of securities of smaller issuers can be more volatile than that of larger issuers.

In addition, the fund is considered non-diversified and can invest a greater portion of assets in securities of a smaller number of individual issuers than a diversified fund. As a result, changes in the market value of a single investment could cause greater fluctuations in share price than would occur in a more diversified fund.

An investment in the fund is not a deposit of a bank and is not insured or guaranteed by the Federal Deposit Insurance Corporation or any other government agency. You could lose money by investing in the fund.

Performance

The following information is intended to help you understand the risks of investing in the fund. The information illustrates the changes in the performance of the fund's shares from year to year and compares the performance of the fund's shares to the performance of a securities market index and an additional index over various periods of time. The indexes have characteristics relevant to the fund's investment strategies. Index descriptions appear in the Additional Index Information section of the prospectus. Past performance (before and after taxes) is not an indication of future performance.

Visit www.fidelity.com for more recent performance information.

Year-by-Year Returns

Calendar Years

During the periods shown in the chart:	Returns	Quarter ended
Highest Quarter Return	26.47%	June 30, 2009
Lowest Quarter Return	-40.29%	September 30, 2008
Year-to-Date Return	-6.96%	March 31, 2017

Average Annual Returns

After-tax returns are calculated using the historical highest individual federal marginal income tax rates, but do not reflect the impact of state or local taxes. Actual after-tax returns may differ depending on your individual circumstances. The after-tax returns shown are not relevant if you hold your shares in a retirement account or in another tax-deferred arrangement, such as an employee benefit plan (profit sharing, 401(k), or 403(b) plan). Return After Taxes on Distributions and Sale of Fund Shares may be higher than other returns for the same period due to a tax benefit of realizing a capital loss upon the sale of fund shares.

For the periods ended December 31, 2016

Average Annual Total Returns{- Natural Gas Portfolio} - 02.28 Select Portfolios: Group 3 Energy Sector Combo PRO-03 - Natural Gas Portfolio	Past 1 year	Past 5 years	Past 10 years
Natural Gas Portfolio-Default | Return Before Taxes	48.46%	0.76%	(0.26%)
Natural Gas Portfolio-Default | After Taxes on Distributions	48.22%	0.46%	(0.65%)
Natural Gas Portfolio-Default | After Taxes on Distributions and Sales	27.59%	0.59%	0.01%
S&P 500® Index(reflects no deduction for fees, expenses, or taxes)	11.96%	14.66%	6.95%
S&P® Custom Natural Gas Index(reflects no deduction for fees, expenses, or taxes)	42.07%	1.30%	3.73%

XML

Label

Element

Value

Risk/Return:

rr_RiskReturnAbstract

Registrant Name

dei_EntityRegistrantName

FIDELITY SELECT PORTFOLIOS

Prospectus Date

rr_ProspectusDate

Apr. 29, 2017

02.28 Select Portfolios: Group 3 Energy Sector Combo PRO-03 | Natural Gas Portfolio

Risk/Return:

rr_RiskReturnAbstract

Risk/Return [Heading]

rr_RiskReturnHeading

Fund Summary

Fund:
Natural Gas Portfolio

Objective [Heading]

rr_ObjectiveHeading

Investment Objective

Objective, Primary [Text Block]

rr_ObjectivePrimaryTextBlock

The fund seeks capital appreciation.

Expense [Heading]

rr_ExpenseHeading

Fee Table

Expense Narrative [Text Block]

rr_ExpenseNarrativeTextBlock

The following table describes the fees and expenses that may be incurred when you buy and hold shares of the fund.

Shareholder Fees Caption [Text]

rr_ShareholderFeesCaption

Shareholder fees

(fees paid directly from your investment)

Operating Expenses Caption [Text]

rr_OperatingExpensesCaption

Annual Operating Expenses

(expenses that you pay each year as a % of the value of your investment)

Portfolio Turnover [Heading]

rr_PortfolioTurnoverHeading

Portfolio Turnover

Portfolio Turnover [Text Block]

rr_PortfolioTurnoverTextBlock

The fund pays transaction costs, such as commissions, when it buys and sells securities (or "turns over" its portfolio). A higher portfolio turnover rate may indicate higher transaction costs and may result in higher taxes when fund shares are held in a taxable account. These costs, which are not reflected in annual operating expenses or in the example, affect the fund's performance. During the most recent fiscal year, the fund's portfolio turnover rate was 76% of the average value of its portfolio.

Portfolio Turnover, Rate

rr_PortfolioTurnoverRate

76.00%

Expense Example Narrative [Text Block]

rr_ExpenseExampleNarrativeTextBlock

This example helps compare the cost of investing in the fund with the cost of investing in other funds.

Let's say, hypothetically, that the annual return for shares of the fund is 5% and that your shareholder fees and the annual operating expenses for shares of the fund are exactly as described in the fee table. This example illustrates the effect of fees and expenses, but is not meant to suggest actual or expected fees and expenses or returns, all of which may vary. For every $10,000 you invested, here's how much you would pay in total expenses if you sell all of your shares at the end of each time period indicated:

Expense Example by, Year, Caption [Text]

rr_ExpenseExampleByYearCaption

Sell All Shares

Strategy [Heading]

rr_StrategyHeading

Principal Investment Strategies

Strategy Narrative [Text Block]

rr_StrategyNarrativeTextBlock

• Normally investing primarily in common stocks.

• Normally investing at least 80% of assets in securities of companies principally engaged in the production, transmission, and distribution of natural gas, and involved in the exploration of potential natural gas sources, as well as those companies that provide services and equipment to natural gas producers, refineries, cogeneration facilities, converters, and distributors.

• Investing in domestic and foreign issuers.

• Using fundamental analysis of factors such as each issuer's financial condition and industry position, as well as market and economic conditions, to select investments.

Strategy Portfolio Concentration [Text]

rr_StrategyPortfolioConcentration

Normally investing at least 80% of assets in securities of companies principally engaged in the production, transmission, and distribution of natural gas, and involved in the exploration of potential natural gas sources, as well as those companies that provide services and equipment to natural gas producers, refineries, cogeneration facilities, converters, and distributors.

Risk [Heading]

rr_RiskHeading

Principal Investment Risks

Risk Narrative [Text Block]

rr_RiskNarrativeTextBlock

• Stock Market Volatility. Stock markets are volatile and can decline significantly in response to adverse issuer, political, regulatory, market, or economic developments. Different parts of the market, including different market sectors, and different types of securities can react differently to these developments.

• Foreign Exposure. Foreign markets can be more volatile than the U.S. market due to increased risks of adverse issuer, political, regulatory, market, or economic developments and can perform differently from the U.S. market.

• Natural Gas Industry Concentration. The natural gas industry is subject to changes in price and supply of energy sources and can be significantly affected by events relating to international politics, energy conservation, the success of energy source exploration projects, and tax and other government regulations.

• Issuer-Specific Changes. The value of an individual security or particular type of security can be more volatile than, and can perform differently from, the market as a whole. The value of securities of smaller issuers can be more volatile than that of larger issuers.

In addition, the fund is considered non-diversified and can invest a greater portion of assets in securities of a smaller number of individual issuers than a diversified fund. As a result, changes in the market value of a single investment could cause greater fluctuations in share price than would occur in a more diversified fund.

An investment in the fund is not a deposit of a bank and is not insured or guaranteed by the Federal Deposit Insurance Corporation or any other government agency. You could lose money by investing in the fund.

Risk Lose Money [Text]

rr_RiskLoseMoney

You could lose money by investing in the fund.

Risk Nondiversified Status [Text]

rr_RiskNondiversifiedStatus

In addition, the fund is considered non-diversified and can invest a greater portion of assets in securities of a smaller number of individual issuers than a diversified fund. As a result, changes in the market value of a single investment could cause greater fluctuations in share price than would occur in a more diversified fund.

Risk Not Insured Depository Institution [Text]

rr_RiskNotInsuredDepositoryInstitution

An investment in the fund is not a deposit of a bank and is not insured or guaranteed by the Federal Deposit Insurance Corporation or any other government agency.

Bar Chart and Performance Table [Heading]

rr_BarChartAndPerformanceTableHeading

Performance

Performance Narrative [Text Block]

rr_PerformanceNarrativeTextBlock

The following information is intended to help you understand the risks of investing in the fund. The information illustrates the changes in the performance of the fund's shares from year to year and compares the performance of the fund's shares to the performance of a securities market index and an additional index over various periods of time. The indexes have characteristics relevant to the fund's investment strategies. Index descriptions appear in the Additional Index Information section of the prospectus. Past performance (before and after taxes) is not an indication of future performance.

Visit www.fidelity.com for more recent performance information.

Performance Information Illustrates Variability of Returns [Text]

rr_PerformanceInformationIllustratesVariabilityOfReturns

The information illustrates the changes in the performance of the fund's shares from year to year and compares the performance of the fund's shares to the performance of a securities market index and an additional index over various periods of time.

Performance Availability Website Address [Text]

rr_PerformanceAvailabilityWebSiteAddress

www.fidelity.com

Performance Past Does Not Indicate Future [Text]

rr_PerformancePastDoesNotIndicateFuture

Past performance (before and after taxes) is not an indication of future performance.

Bar Chart [Heading]

rr_BarChartHeading

Year-by-Year Returns

Calendar Years

Bar Chart Closing [Text Block]

rr_BarChartClosingTextBlock

During the periods shown in the chart:	Returns	Quarter ended
Highest Quarter Return	26.47%	June 30, 2009
Lowest Quarter Return	-40.29%	September 30, 2008
Year-to-Date Return	-6.96%	March 31, 2017

Performance Table Heading

rr_PerformanceTableHeading

Average Annual Returns

Performance Table Uses Highest Federal Rate

rr_PerformanceTableUsesHighestFederalRate

After-tax returns are calculated using the historical highest individual federal marginal income tax rates, but do not reflect the impact of state or local taxes.

Performance Table Not Relevant to Tax Deferred

rr_PerformanceTableNotRelevantToTaxDeferred

The after-tax returns shown are not relevant if you hold your shares in a retirement account or in another tax-deferred arrangement, such as an employee benefit plan (profit sharing, 401(k), or 403(b) plan).

Performance Table Explanation after Tax Higher

rr_PerformanceTableExplanationAfterTaxHigher

Return After Taxes on Distributions and Sale of Fund Shares may be higher than other returns for the same period due to a tax benefit of realizing a capital loss upon the sale of fund shares.

Performance Table Narrative

rr_PerformanceTableNarrativeTextBlock

After-tax returns are calculated using the historical highest individual federal marginal income tax rates, but do not reflect the impact of state or local taxes. Actual after-tax returns may differ depending on your individual circumstances. The after-tax returns shown are not relevant if you hold your shares in a retirement account or in another tax-deferred arrangement, such as an employee benefit plan (profit sharing, 401(k), or 403(b) plan). Return After Taxes on Distributions and Sale of Fund Shares may be higher than other returns for the same period due to a tax benefit of realizing a capital loss upon the sale of fund shares.

For the periods ended December 31, 2016

02.28 Select Portfolios: Group 3 Energy Sector Combo PRO-03 | Natural Gas Portfolio | Natural Gas Portfolio-Default

Risk/Return:

rr_RiskReturnAbstract

Redemption fee on shares held less than 30 days (as a % of amount redeemed)

rr_RedemptionFeeOverRedemption

0.75%

Management fee

rr_ManagementFeesOverAssets

0.55%

Distribution and/or Service (12b-1) fees

rr_DistributionAndService12b1FeesOverAssets

none

Other expenses

rr_OtherExpensesOverAssets

0.32%

Total annual operating expenses

rr_ExpensesOverAssets

0.87%

1 year

rr_ExpenseExampleYear01

$ 89

3 years

rr_ExpenseExampleYear03

278

5 years

rr_ExpenseExampleYear05

482

10 years

rr_ExpenseExampleYear10

$ 1,073

2007

rr_AnnualReturn2007

40.91%

2008

rr_AnnualReturn2008

(56.65%)

2009

rr_AnnualReturn2009

56.32%

2010

rr_AnnualReturn2010

6.43%

2011

rr_AnnualReturn2011

(7.67%)

2012

rr_AnnualReturn2012

2.44%

2013

rr_AnnualReturn2013

24.66%

2014

rr_AnnualReturn2014

(13.29%)

2015

rr_AnnualReturn2015

(36.82%)

2016

rr_AnnualReturn2016

48.46%

Year to Date Return, Label

rr_YearToDateReturnLabel

Year-to-Date Return

Bar Chart, Year to Date Return, Date

rr_BarChartYearToDateReturnDate

Mar. 31, 2017

Bar Chart, Year to Date Return

rr_BarChartYearToDateReturn

(6.96%)

Highest Quarterly Return, Label

rr_HighestQuarterlyReturnLabel

Highest Quarter Return

Highest Quarterly Return, Date

rr_BarChartHighestQuarterlyReturnDate

Jun. 30, 2009

Highest Quarterly Return

rr_BarChartHighestQuarterlyReturn

26.47%

Lowest Quarterly Return, Label

rr_LowestQuarterlyReturnLabel

Lowest Quarter Return

Lowest Quarterly Return, Date

rr_BarChartLowestQuarterlyReturnDate

Sep. 30, 2008

Lowest Quarterly Return

rr_BarChartLowestQuarterlyReturn

(40.29%)

02.28 Select Portfolios: Group 3 Energy Sector Combo PRO-03 | Natural Gas Portfolio | Return Before Taxes | Natural Gas Portfolio-Default

Risk/Return:

rr_RiskReturnAbstract

Column

rr_AverageAnnualReturnColumnName

Natural Gas Portfolio

Label

rr_AverageAnnualReturnLabel

Return Before Taxes

Past 1 year

rr_AverageAnnualReturnYear01

48.46%

Past 5 years

rr_AverageAnnualReturnYear05

0.76%

Past 10 years

rr_AverageAnnualReturnYear10

(0.26%)

02.28 Select Portfolios: Group 3 Energy Sector Combo PRO-03 | Natural Gas Portfolio | After Taxes on Distributions | Natural Gas Portfolio-Default

Risk/Return:

rr_RiskReturnAbstract

Column

rr_AverageAnnualReturnColumnName

Natural Gas Portfolio

Label

rr_AverageAnnualReturnLabel

Return After Taxes on Distributions

Past 1 year

rr_AverageAnnualReturnYear01

48.22%

Past 5 years

rr_AverageAnnualReturnYear05

0.46%

Past 10 years

rr_AverageAnnualReturnYear10

(0.65%)

02.28 Select Portfolios: Group 3 Energy Sector Combo PRO-03 | Natural Gas Portfolio | After Taxes on Distributions and Sales | Natural Gas Portfolio-Default

Risk/Return:

rr_RiskReturnAbstract

Column

rr_AverageAnnualReturnColumnName

Natural Gas Portfolio

Label

rr_AverageAnnualReturnLabel

Return After Taxes on Distributions and Sale of Fund Shares

Past 1 year

rr_AverageAnnualReturnYear01

27.59%

Past 5 years

rr_AverageAnnualReturnYear05

0.59%

Past 10 years

rr_AverageAnnualReturnYear10

0.01%

02.28 Select Portfolios: Group 3 Energy Sector Combo PRO-03 | Natural Gas Portfolio | S&P 500® Index(reflects no deduction for fees, expenses, or taxes)

Risk/Return:

rr_RiskReturnAbstract

Past 1 year

rr_AverageAnnualReturnYear01

11.96%

Past 5 years

rr_AverageAnnualReturnYear05

14.66%

Past 10 years

rr_AverageAnnualReturnYear10

6.95%

02.28 Select Portfolios: Group 3 Energy Sector Combo PRO-03 | Natural Gas Portfolio | S&P® Custom Natural Gas Index(reflects no deduction for fees, expenses, or taxes)

Risk/Return:

rr_RiskReturnAbstract

Past 1 year

rr_AverageAnnualReturnYear01

42.07%

Past 5 years

rr_AverageAnnualReturnYear05

1.30%

Past 10 years

rr_AverageAnnualReturnYear10

3.73%

XML

02.28 Select Portfolios: Group 3 Energy Sector Combo PRO-03 | Natural Resources Portfolio

Fund Summary

Fund:
Natural Resources Portfolio

Investment Objective

The fund seeks capital appreciation.

Fee Table

The following table describes the fees and expenses that may be incurred when you buy and hold shares of the fund.

Shareholder fees

(fees paid directly from your investment)

Shareholder Fees {- Natural Resources Portfolio}	02.28 Select Portfolios: Group 3 Energy Sector Combo PRO-03 Natural Resources Portfolio Natural Resources Portfolio-Default
Redemption fee on shares held less than 30 days (as a % of amount redeemed)	0.75%

Annual Operating Expenses

(expenses that you pay each year as a % of the value of your investment)

Annual Operating Expenses {- Natural Resources Portfolio}	02.28 Select Portfolios: Group 3 Energy Sector Combo PRO-03 Natural Resources Portfolio Natural Resources Portfolio-Default
Management fee	0.55%
Distribution and/or Service (12b-1) fees	none
Other expenses	0.29%
Total annual operating expenses	0.84%

This example helps compare the cost of investing in the fund with the cost of investing in other funds.

Let's say, hypothetically, that the annual return for shares of the fund is 5% and that your shareholder fees and the annual operating expenses for shares of the fund are exactly as described in the fee table. This example illustrates the effect of fees and expenses, but is not meant to suggest actual or expected fees and expenses or returns, all of which may vary. For every $10,000 you invested, here's how much you would pay in total expenses if you sell all of your shares at the end of each time period indicated:

Sell All Shares

Expense Example {- Natural Resources Portfolio}	02.28 Select Portfolios: Group 3 Energy Sector Combo PRO-03 Natural Resources Portfolio Natural Resources Portfolio-Default USD ($)
1 year	$ 86
3 years	268
5 years	466
10 years	$ 1,037

Portfolio Turnover

The fund pays transaction costs, such as commissions, when it buys and sells securities (or "turns over" its portfolio). A higher portfolio turnover rate may indicate higher transaction costs and may result in higher taxes when fund shares are held in a taxable account. These costs, which are not reflected in annual operating expenses or in the example, affect the fund's performance. During the most recent fiscal year, the fund's portfolio turnover rate was 84% of the average value of its portfolio.

Principal Investment Strategies

• Normally investing primarily in common stocks and in certain precious metals.

• Normally investing at least 80% of assets in securities of companies principally engaged in owning or developing natural resources, or supplying goods and services to such companies, and in precious metals.

• Investing in domestic and foreign issuers.

• Using fundamental analysis of factors such as each issuer's financial condition and industry position, as well as market and economic conditions, to select investments.

Principal Investment Risks

• Stock Market Volatility. Stock markets are volatile and can decline significantly in response to adverse issuer, political, regulatory, market, or economic developments. Different parts of the market, including different market sectors, and different types of securities can react differently to these developments.

• Foreign Exposure. Foreign markets can be more volatile than the U.S. market due to increased risks of adverse issuer, political, regulatory, market, or economic developments and can perform differently from the U.S. market.

• Natural Resources Industry Concentration. The natural resources industries can be significantly affected by events relating to international political and economic developments, energy conservation, the success of exploration projects, commodity prices, and tax and other government regulations.

• Issuer-Specific Changes. The value of an individual security or particular type of security can be more volatile than, and can perform differently from, the market as a whole. The value of securities of smaller issuers can be more volatile than that of larger issuers.

An investment in the fund is not a deposit of a bank and is not insured or guaranteed by the Federal Deposit Insurance Corporation or any other government agency. You could lose money by investing in the fund.

Performance

The following information is intended to help you understand the risks of investing in the fund. The information illustrates the changes in the performance of the fund's shares from year to year and compares the performance of the fund's shares to the performance of a securities market index and an additional index over various periods of time. The indexes have characteristics relevant to the fund's investment strategies. Index descriptions appear in the Additional Index Information section of the prospectus. Past performance (before and after taxes) is not an indication of future performance.

Visit www.fidelity.com for more recent performance information.

Year-by-Year Returns

Calendar Years

During the periods shown in the chart:	Returns	Quarter ended
Highest Quarter Return	24.75%	December 31, 2010
Lowest Quarter Return	-37.37%	September 30, 2008
Year-to-Date Return	-5.17%	March 31, 2017

Average Annual Returns

After-tax returns are calculated using the historical highest individual federal marginal income tax rates, but do not reflect the impact of state or local taxes. Actual after-tax returns may differ depending on your individual circumstances. The after-tax returns shown are not relevant if you hold your shares in a retirement account or in another tax-deferred arrangement, such as an employee benefit plan (profit sharing, 401(k), or 403(b) plan). Return After Taxes on Distributions and Sale of Fund Shares may be higher than other returns for the same period due to a tax benefit of realizing a capital loss upon the sale of fund shares.

For the periods ended December 31, 2016

Average Annual Total Returns{- Natural Resources Portfolio} - 02.28 Select Portfolios: Group 3 Energy Sector Combo PRO-03 - Natural Resources Portfolio	Past 1 year	Past 5 years	Past 10 years
Natural Resources Portfolio-Default | Return Before Taxes	30.24%	1.68%	2.79%
Natural Resources Portfolio-Default | After Taxes on Distributions	30.03%	1.18%	2.41%
Natural Resources Portfolio-Default | After Taxes on Distributions and Sales	17.26%	1.30%	2.25%
S&P 500® Index(reflects no deduction for fees, expenses, or taxes)	11.96%	14.66%	6.95%
S&P® North American Natural Resources Sector Index(reflects no deduction for fees, expenses, or taxes)	30.87%	1.26%	2.64%

XML

Label

Element

Value

Risk/Return:

rr_RiskReturnAbstract

Registrant Name

dei_EntityRegistrantName

FIDELITY SELECT PORTFOLIOS

Prospectus Date

rr_ProspectusDate

Apr. 29, 2017

02.28 Select Portfolios: Group 3 Energy Sector Combo PRO-03 | Natural Resources Portfolio

Risk/Return:

rr_RiskReturnAbstract

Risk/Return [Heading]

rr_RiskReturnHeading

Fund Summary

Fund:
Natural Resources Portfolio

Objective [Heading]

rr_ObjectiveHeading

Investment Objective

Objective, Primary [Text Block]

rr_ObjectivePrimaryTextBlock

The fund seeks capital appreciation.

Expense [Heading]

rr_ExpenseHeading

Fee Table

Expense Narrative [Text Block]

rr_ExpenseNarrativeTextBlock

The following table describes the fees and expenses that may be incurred when you buy and hold shares of the fund.

Shareholder Fees Caption [Text]

rr_ShareholderFeesCaption

Shareholder fees

(fees paid directly from your investment)

Operating Expenses Caption [Text]

rr_OperatingExpensesCaption

Annual Operating Expenses

(expenses that you pay each year as a % of the value of your investment)

Portfolio Turnover [Heading]

rr_PortfolioTurnoverHeading

Portfolio Turnover

Portfolio Turnover [Text Block]

rr_PortfolioTurnoverTextBlock

The fund pays transaction costs, such as commissions, when it buys and sells securities (or "turns over" its portfolio). A higher portfolio turnover rate may indicate higher transaction costs and may result in higher taxes when fund shares are held in a taxable account. These costs, which are not reflected in annual operating expenses or in the example, affect the fund's performance. During the most recent fiscal year, the fund's portfolio turnover rate was 84% of the average value of its portfolio.

Portfolio Turnover, Rate

rr_PortfolioTurnoverRate

84.00%

Expense Example Narrative [Text Block]

rr_ExpenseExampleNarrativeTextBlock

This example helps compare the cost of investing in the fund with the cost of investing in other funds.

Let's say, hypothetically, that the annual return for shares of the fund is 5% and that your shareholder fees and the annual operating expenses for shares of the fund are exactly as described in the fee table. This example illustrates the effect of fees and expenses, but is not meant to suggest actual or expected fees and expenses or returns, all of which may vary. For every $10,000 you invested, here's how much you would pay in total expenses if you sell all of your shares at the end of each time period indicated:

Expense Example by, Year, Caption [Text]

rr_ExpenseExampleByYearCaption

Sell All Shares

Strategy [Heading]

rr_StrategyHeading

Principal Investment Strategies

Strategy Narrative [Text Block]

rr_StrategyNarrativeTextBlock

• Normally investing primarily in common stocks and in certain precious metals.

• Normally investing at least 80% of assets in securities of companies principally engaged in owning or developing natural resources, or supplying goods and services to such companies, and in precious metals.

• Investing in domestic and foreign issuers.

• Using fundamental analysis of factors such as each issuer's financial condition and industry position, as well as market and economic conditions, to select investments.

Strategy Portfolio Concentration [Text]

rr_StrategyPortfolioConcentration

Normally investing at least 80% of assets in securities of companies principally engaged in owning or developing natural resources, or supplying goods and services to such companies, and in precious metals.

Risk [Heading]

rr_RiskHeading

Principal Investment Risks

Risk Narrative [Text Block]

rr_RiskNarrativeTextBlock

• Stock Market Volatility. Stock markets are volatile and can decline significantly in response to adverse issuer, political, regulatory, market, or economic developments. Different parts of the market, including different market sectors, and different types of securities can react differently to these developments.

• Foreign Exposure. Foreign markets can be more volatile than the U.S. market due to increased risks of adverse issuer, political, regulatory, market, or economic developments and can perform differently from the U.S. market.

• Natural Resources Industry Concentration. The natural resources industries can be significantly affected by events relating to international political and economic developments, energy conservation, the success of exploration projects, commodity prices, and tax and other government regulations.

• Issuer-Specific Changes. The value of an individual security or particular type of security can be more volatile than, and can perform differently from, the market as a whole. The value of securities of smaller issuers can be more volatile than that of larger issuers.

An investment in the fund is not a deposit of a bank and is not insured or guaranteed by the Federal Deposit Insurance Corporation or any other government agency. You could lose money by investing in the fund.

Risk Lose Money [Text]

rr_RiskLoseMoney

You could lose money by investing in the fund.

Risk Not Insured Depository Institution [Text]

rr_RiskNotInsuredDepositoryInstitution

An investment in the fund is not a deposit of a bank and is not insured or guaranteed by the Federal Deposit Insurance Corporation or any other government agency.

Bar Chart and Performance Table [Heading]

rr_BarChartAndPerformanceTableHeading

Performance

Performance Narrative [Text Block]

rr_PerformanceNarrativeTextBlock

The following information is intended to help you understand the risks of investing in the fund. The information illustrates the changes in the performance of the fund's shares from year to year and compares the performance of the fund's shares to the performance of a securities market index and an additional index over various periods of time. The indexes have characteristics relevant to the fund's investment strategies. Index descriptions appear in the Additional Index Information section of the prospectus. Past performance (before and after taxes) is not an indication of future performance.

Visit www.fidelity.com for more recent performance information.

Performance Information Illustrates Variability of Returns [Text]

rr_PerformanceInformationIllustratesVariabilityOfReturns

The information illustrates the changes in the performance of the fund's shares from year to year and compares the performance of the fund's shares to the performance of a securities market index and an additional index over various periods of time.

Performance Availability Website Address [Text]

rr_PerformanceAvailabilityWebSiteAddress

www.fidelity.com

Performance Past Does Not Indicate Future [Text]

rr_PerformancePastDoesNotIndicateFuture

Past performance (before and after taxes) is not an indication of future performance.

Bar Chart [Heading]

rr_BarChartHeading

Year-by-Year Returns

Calendar Years

Bar Chart Closing [Text Block]

rr_BarChartClosingTextBlock

During the periods shown in the chart:	Returns	Quarter ended
Highest Quarter Return	24.75%	December 31, 2010
Lowest Quarter Return	-37.37%	September 30, 2008
Year-to-Date Return	-5.17%	March 31, 2017

Performance Table Heading

rr_PerformanceTableHeading

Average Annual Returns

Performance Table Uses Highest Federal Rate

rr_PerformanceTableUsesHighestFederalRate

After-tax returns are calculated using the historical highest individual federal marginal income tax rates, but do not reflect the impact of state or local taxes.

Performance Table Not Relevant to Tax Deferred

rr_PerformanceTableNotRelevantToTaxDeferred

The after-tax returns shown are not relevant if you hold your shares in a retirement account or in another tax-deferred arrangement, such as an employee benefit plan (profit sharing, 401(k), or 403(b) plan).

Performance Table Explanation after Tax Higher

rr_PerformanceTableExplanationAfterTaxHigher

Return After Taxes on Distributions and Sale of Fund Shares may be higher than other returns for the same period due to a tax benefit of realizing a capital loss upon the sale of fund shares.

Performance Table Narrative

rr_PerformanceTableNarrativeTextBlock

After-tax returns are calculated using the historical highest individual federal marginal income tax rates, but do not reflect the impact of state or local taxes. Actual after-tax returns may differ depending on your individual circumstances. The after-tax returns shown are not relevant if you hold your shares in a retirement account or in another tax-deferred arrangement, such as an employee benefit plan (profit sharing, 401(k), or 403(b) plan). Return After Taxes on Distributions and Sale of Fund Shares may be higher than other returns for the same period due to a tax benefit of realizing a capital loss upon the sale of fund shares.

For the periods ended December 31, 2016

02.28 Select Portfolios: Group 3 Energy Sector Combo PRO-03 | Natural Resources Portfolio | Natural Resources Portfolio-Default

Risk/Return:

rr_RiskReturnAbstract

Redemption fee on shares held less than 30 days (as a % of amount redeemed)

rr_RedemptionFeeOverRedemption

0.75%

Management fee

rr_ManagementFeesOverAssets

0.55%

Distribution and/or Service (12b-1) fees

rr_DistributionAndService12b1FeesOverAssets

none

Other expenses

rr_OtherExpensesOverAssets

0.29%

Total annual operating expenses

rr_ExpensesOverAssets

0.84%

1 year

rr_ExpenseExampleYear01

$ 86

3 years

rr_ExpenseExampleYear03

268

5 years

rr_ExpenseExampleYear05

466

10 years

rr_ExpenseExampleYear10

$ 1,037

2007

rr_AnnualReturn2007

50.08%

2008

rr_AnnualReturn2008

(52.39%)

2009

rr_AnnualReturn2009

51.74%

2010

rr_AnnualReturn2010

23.09%

2011

rr_AnnualReturn2011

(9.25%)

2012

rr_AnnualReturn2012

3.35%

2013

rr_AnnualReturn2013

17.49%

2014

rr_AnnualReturn2014

(12.29%)

2015

rr_AnnualReturn2015

(21.64%)

2016

rr_AnnualReturn2016

30.24%

Year to Date Return, Label

rr_YearToDateReturnLabel

Year-to-Date Return

Bar Chart, Year to Date Return, Date

rr_BarChartYearToDateReturnDate

Mar. 31, 2017

Bar Chart, Year to Date Return

rr_BarChartYearToDateReturn

(5.17%)

Highest Quarterly Return, Label

rr_HighestQuarterlyReturnLabel

Highest Quarter Return

Highest Quarterly Return, Date

rr_BarChartHighestQuarterlyReturnDate

Dec. 31, 2010

Highest Quarterly Return

rr_BarChartHighestQuarterlyReturn

24.75%

Lowest Quarterly Return, Label

rr_LowestQuarterlyReturnLabel

Lowest Quarter Return

Lowest Quarterly Return, Date

rr_BarChartLowestQuarterlyReturnDate

Sep. 30, 2008

Lowest Quarterly Return

rr_BarChartLowestQuarterlyReturn

(37.37%)

02.28 Select Portfolios: Group 3 Energy Sector Combo PRO-03 | Natural Resources Portfolio | Return Before Taxes | Natural Resources Portfolio-Default

Risk/Return:

rr_RiskReturnAbstract

Column

rr_AverageAnnualReturnColumnName

Natural Resources Portfolio

Label

rr_AverageAnnualReturnLabel

Return Before Taxes

Past 1 year

rr_AverageAnnualReturnYear01

30.24%

Past 5 years

rr_AverageAnnualReturnYear05

1.68%

Past 10 years

rr_AverageAnnualReturnYear10

2.79%

02.28 Select Portfolios: Group 3 Energy Sector Combo PRO-03 | Natural Resources Portfolio | After Taxes on Distributions | Natural Resources Portfolio-Default

Risk/Return:

rr_RiskReturnAbstract

Column

rr_AverageAnnualReturnColumnName

Natural Resources Portfolio

Label

rr_AverageAnnualReturnLabel

Return After Taxes on Distributions

Past 1 year

rr_AverageAnnualReturnYear01

30.03%

Past 5 years

rr_AverageAnnualReturnYear05

1.18%

Past 10 years

rr_AverageAnnualReturnYear10

2.41%

02.28 Select Portfolios: Group 3 Energy Sector Combo PRO-03 | Natural Resources Portfolio | After Taxes on Distributions and Sales | Natural Resources Portfolio-Default

Risk/Return:

rr_RiskReturnAbstract

Column

rr_AverageAnnualReturnColumnName

Natural Resources Portfolio

Label

rr_AverageAnnualReturnLabel

Return After Taxes on Distributions and Sale of Fund Shares

Past 1 year

rr_AverageAnnualReturnYear01

17.26%

Past 5 years

rr_AverageAnnualReturnYear05

1.30%

Past 10 years

rr_AverageAnnualReturnYear10

2.25%

02.28 Select Portfolios: Group 3 Energy Sector Combo PRO-03 | Natural Resources Portfolio | S&P 500® Index(reflects no deduction for fees, expenses, or taxes)

Risk/Return:

rr_RiskReturnAbstract

Past 1 year

rr_AverageAnnualReturnYear01

11.96%

Past 5 years

rr_AverageAnnualReturnYear05

14.66%

Past 10 years

rr_AverageAnnualReturnYear10

6.95%

02.28 Select Portfolios: Group 3 Energy Sector Combo PRO-03 | Natural Resources Portfolio | S&P® North American Natural Resources Sector Index(reflects no deduction for fees, expenses, or taxes)

Risk/Return:

rr_RiskReturnAbstract

Past 1 year

rr_AverageAnnualReturnYear01

30.87%

Past 5 years

rr_AverageAnnualReturnYear05

1.26%

Past 10 years

rr_AverageAnnualReturnYear10

2.64%

XML

02.28 Select Portfolios: Group 1 Consumer Discretionary Sector Combo PRO-06 | Automotive Portfolio

Fund Summary

Fund:
Automotive Portfolio

Investment Objective

The fund seeks capital appreciation.

Fee Table

The following table describes the fees and expenses that may be incurred when you buy and hold shares of the fund.

Shareholder fees

(fees paid directly from your investment)

Shareholder Fees {- Automotive Portfolio}	02.28 Select Portfolios: Group 1 Consumer Discretionary Sector Combo PRO-06 Automotive Portfolio Automotive Portfolio-Default
Redemption fee on shares held less than 30 days (as a % of amount redeemed)	0.75%

Annual Operating Expenses

(expenses that you pay each year as a % of the value of your investment)

Annual Operating Expenses {- Automotive Portfolio}	02.28 Select Portfolios: Group 1 Consumer Discretionary Sector Combo PRO-06 Automotive Portfolio Automotive Portfolio-Default
Management fee	0.55%
Distribution and/or Service (12b-1) fees	none
Other expenses	0.41%
Total annual operating expenses	0.96%

This example helps compare the cost of investing in the fund with the cost of investing in other funds.

Let's say, hypothetically, that the annual return for shares of the fund is 5% and that your shareholder fees and the annual operating expenses for shares of the fund are exactly as described in the fee table. This example illustrates the effect of fees and expenses, but is not meant to suggest actual or expected fees and expenses or returns, all of which may vary. For every $10,000 you invested, here's how much you would pay in total expenses if you sell all of your shares at the end of each time period indicated:

Sell All Shares

Expense Example {- Automotive Portfolio}	02.28 Select Portfolios: Group 1 Consumer Discretionary Sector Combo PRO-06 Automotive Portfolio Automotive Portfolio-Default USD ($)
1 year	$ 98
3 years	306
5 years	531
10 years	$ 1,178

Portfolio Turnover

The fund pays transaction costs, such as commissions, when it buys and sells securities (or "turns over" its portfolio). A higher portfolio turnover rate may indicate higher transaction costs and may result in higher taxes when fund shares are held in a taxable account. These costs, which are not reflected in annual operating expenses or in the example, affect the fund's performance. During the most recent fiscal year, the fund's portfolio turnover rate was 83% of the average value of its portfolio.

Principal Investment Strategies

• Normally investing primarily in common stocks.

• Normally investing at least 80% of assets in securities of companies principally engaged in the manufacture, marketing or sale of automobiles, trucks, specialty vehicles, parts, tires, and related services.

• Investing in domestic and foreign issuers.

• Using fundamental analysis of factors such as each issuer's financial condition and industry position, as well as market and economic conditions, to select investments.

Principal Investment Risks

• Stock Market Volatility. Stock markets are volatile and can decline significantly in response to adverse issuer, political, regulatory, market, or economic developments. Different parts of the market, including different market sectors, and different types of securities can react differently to these developments.

• Foreign Exposure. Foreign markets can be more volatile than the U.S. market due to increased risks of adverse issuer, political, regulatory, market, or economic developments and can perform differently from the U.S. market.

• Automotive Industry Concentration. The automotive industry is highly cyclical and can be significantly affected by labor relations and fluctuating component prices.

• Issuer-Specific Changes. The value of an individual security or particular type of security can be more volatile than, and can perform differently from, the market as a whole. The value of securities of smaller issuers can be more volatile than that of larger issuers.

In addition, the fund is considered non-diversified and can invest a greater portion of assets in securities of a smaller number of individual issuers than a diversified fund. As a result, changes in the market value of a single investment could cause greater fluctuations in share price than would occur in a more diversified fund.

An investment in the fund is not a deposit of a bank and is not insured or guaranteed by the Federal Deposit Insurance Corporation or any other government agency. You could lose money by investing in the fund.

Performance

The following information is intended to help you understand the risks of investing in the fund. The information illustrates the changes in the performance of the fund's shares from year to year and compares the performance of the fund's shares to the performance of a securities market index and an additional index over various periods of time. The indexes have characteristics relevant to the fund's investment strategies. Index descriptions appear in the Additional Index Information section of the prospectus. Past performance (before and after taxes) is not an indication of future performance.

Visit www.fidelity.com for more recent performance information.

Year-by-Year Returns

Calendar Years

During the periods shown in the chart:	Returns	Quarter ended
Highest Quarter Return	81.42%	June 30, 2009
Lowest Quarter Return	-44.67%	December 31, 2008
Year-to-Date Return	5.98%	March 31, 2017

Average Annual Returns

After-tax returns are calculated using the historical highest individual federal marginal income tax rates, but do not reflect the impact of state or local taxes. Actual after-tax returns may differ depending on your individual circumstances. The after-tax returns shown are not relevant if you hold your shares in a retirement account or in another tax-deferred arrangement, such as an employee benefit plan (profit sharing, 401(k), or 403(b) plan). Return After Taxes on Distributions and Sale of Fund Shares may be higher than other returns for the same period due to a tax benefit of realizing a capital loss upon the sale of fund shares.

For the periods ended December 31, 2016

Average Annual Total Returns{- Automotive Portfolio} - 02.28 Select Portfolios: Group 1 Consumer Discretionary Sector Combo PRO-06 - Automotive Portfolio	Past 1 year	Past 5 years	Past 10 years
Automotive Portfolio-Default | Return Before Taxes	(5.83%)	12.40%	5.26%
Automotive Portfolio-Default | After Taxes on Distributions	(7.32%)	9.95%	3.82%
Automotive Portfolio-Default | After Taxes on Distributions and Sales	(2.06%)	9.94%	4.15%
S&P 500® Index(reflects no deduction for fees, expenses, or taxes)	11.96%	14.66%	6.95%
S&P® Custom Automobiles & Components Index(reflects no deduction for fees, expenses, or taxes)	5.42%	14.96%	4.60%

XML

Label

Element

Value

Risk/Return:

rr_RiskReturnAbstract

Registrant Name

dei_EntityRegistrantName

FIDELITY SELECT PORTFOLIOS

Prospectus Date

rr_ProspectusDate

Apr. 29, 2017

02.28 Select Portfolios: Group 1 Consumer Discretionary Sector Combo PRO-06 | Automotive Portfolio

Risk/Return:

rr_RiskReturnAbstract

Risk/Return [Heading]

rr_RiskReturnHeading

Fund Summary

Fund:
Automotive Portfolio

Objective [Heading]

rr_ObjectiveHeading

Investment Objective

Objective, Primary [Text Block]

rr_ObjectivePrimaryTextBlock

The fund seeks capital appreciation.

Expense [Heading]

rr_ExpenseHeading

Fee Table

Expense Narrative [Text Block]

rr_ExpenseNarrativeTextBlock

The following table describes the fees and expenses that may be incurred when you buy and hold shares of the fund.

Shareholder Fees Caption [Text]

rr_ShareholderFeesCaption

Shareholder fees

(fees paid directly from your investment)

Operating Expenses Caption [Text]

rr_OperatingExpensesCaption

Annual Operating Expenses

(expenses that you pay each year as a % of the value of your investment)

Portfolio Turnover [Heading]

rr_PortfolioTurnoverHeading

Portfolio Turnover

Portfolio Turnover [Text Block]

rr_PortfolioTurnoverTextBlock

The fund pays transaction costs, such as commissions, when it buys and sells securities (or "turns over" its portfolio). A higher portfolio turnover rate may indicate higher transaction costs and may result in higher taxes when fund shares are held in a taxable account. These costs, which are not reflected in annual operating expenses or in the example, affect the fund's performance. During the most recent fiscal year, the fund's portfolio turnover rate was 83% of the average value of its portfolio.

Portfolio Turnover, Rate

rr_PortfolioTurnoverRate

83.00%

Expense Example Narrative [Text Block]

rr_ExpenseExampleNarrativeTextBlock

This example helps compare the cost of investing in the fund with the cost of investing in other funds.

Let's say, hypothetically, that the annual return for shares of the fund is 5% and that your shareholder fees and the annual operating expenses for shares of the fund are exactly as described in the fee table. This example illustrates the effect of fees and expenses, but is not meant to suggest actual or expected fees and expenses or returns, all of which may vary. For every $10,000 you invested, here's how much you would pay in total expenses if you sell all of your shares at the end of each time period indicated:

Expense Example by, Year, Caption [Text]

rr_ExpenseExampleByYearCaption

Sell All Shares

Strategy [Heading]

rr_StrategyHeading

Principal Investment Strategies

Strategy Narrative [Text Block]

rr_StrategyNarrativeTextBlock

• Normally investing primarily in common stocks.

• Normally investing at least 80% of assets in securities of companies principally engaged in the manufacture, marketing or sale of automobiles, trucks, specialty vehicles, parts, tires, and related services.

• Investing in domestic and foreign issuers.

• Using fundamental analysis of factors such as each issuer's financial condition and industry position, as well as market and economic conditions, to select investments.

Strategy Portfolio Concentration [Text]

rr_StrategyPortfolioConcentration

Normally investing at least 80% of assets in securities of companies principally engaged in the manufacture, marketing or sale of automobiles, trucks, specialty vehicles, parts, tires, and related services.

Risk [Heading]

rr_RiskHeading

Principal Investment Risks

Risk Narrative [Text Block]

rr_RiskNarrativeTextBlock

• Stock Market Volatility. Stock markets are volatile and can decline significantly in response to adverse issuer, political, regulatory, market, or economic developments. Different parts of the market, including different market sectors, and different types of securities can react differently to these developments.

• Foreign Exposure. Foreign markets can be more volatile than the U.S. market due to increased risks of adverse issuer, political, regulatory, market, or economic developments and can perform differently from the U.S. market.

• Automotive Industry Concentration. The automotive industry is highly cyclical and can be significantly affected by labor relations and fluctuating component prices.

• Issuer-Specific Changes. The value of an individual security or particular type of security can be more volatile than, and can perform differently from, the market as a whole. The value of securities of smaller issuers can be more volatile than that of larger issuers.

In addition, the fund is considered non-diversified and can invest a greater portion of assets in securities of a smaller number of individual issuers than a diversified fund. As a result, changes in the market value of a single investment could cause greater fluctuations in share price than would occur in a more diversified fund.

An investment in the fund is not a deposit of a bank and is not insured or guaranteed by the Federal Deposit Insurance Corporation or any other government agency. You could lose money by investing in the fund.

Risk Lose Money [Text]

rr_RiskLoseMoney

You could lose money by investing in the fund.

Risk Nondiversified Status [Text]

rr_RiskNondiversifiedStatus

In addition, the fund is considered non-diversified and can invest a greater portion of assets in securities of a smaller number of individual issuers than a diversified fund. As a result, changes in the market value of a single investment could cause greater fluctuations in share price than would occur in a more diversified fund.

Risk Not Insured Depository Institution [Text]

rr_RiskNotInsuredDepositoryInstitution

An investment in the fund is not a deposit of a bank and is not insured or guaranteed by the Federal Deposit Insurance Corporation or any other government agency.

Bar Chart and Performance Table [Heading]

rr_BarChartAndPerformanceTableHeading

Performance

Performance Narrative [Text Block]

rr_PerformanceNarrativeTextBlock

The following information is intended to help you understand the risks of investing in the fund. The information illustrates the changes in the performance of the fund's shares from year to year and compares the performance of the fund's shares to the performance of a securities market index and an additional index over various periods of time. The indexes have characteristics relevant to the fund's investment strategies. Index descriptions appear in the Additional Index Information section of the prospectus. Past performance (before and after taxes) is not an indication of future performance.

Visit www.fidelity.com for more recent performance information.

Performance Information Illustrates Variability of Returns [Text]

rr_PerformanceInformationIllustratesVariabilityOfReturns

The information illustrates the changes in the performance of the fund's shares from year to year and compares the performance of the fund's shares to the performance of a securities market index and an additional index over various periods of time.

Performance Availability Website Address [Text]

rr_PerformanceAvailabilityWebSiteAddress

www.fidelity.com

Performance Past Does Not Indicate Future [Text]

rr_PerformancePastDoesNotIndicateFuture

Past performance (before and after taxes) is not an indication of future performance.

Bar Chart [Heading]

rr_BarChartHeading

Year-by-Year Returns

Calendar Years

Bar Chart Closing [Text Block]

rr_BarChartClosingTextBlock

During the periods shown in the chart:	Returns	Quarter ended
Highest Quarter Return	81.42%	June 30, 2009
Lowest Quarter Return	-44.67%	December 31, 2008
Year-to-Date Return	5.98%	March 31, 2017

Performance Table Heading

rr_PerformanceTableHeading

Average Annual Returns

Performance Table Uses Highest Federal Rate

rr_PerformanceTableUsesHighestFederalRate

After-tax returns are calculated using the historical highest individual federal marginal income tax rates, but do not reflect the impact of state or local taxes.

Performance Table Not Relevant to Tax Deferred

rr_PerformanceTableNotRelevantToTaxDeferred

The after-tax returns shown are not relevant if you hold your shares in a retirement account or in another tax-deferred arrangement, such as an employee benefit plan (profit sharing, 401(k), or 403(b) plan).

Performance Table Explanation after Tax Higher

rr_PerformanceTableExplanationAfterTaxHigher

Return After Taxes on Distributions and Sale of Fund Shares may be higher than other returns for the same period due to a tax benefit of realizing a capital loss upon the sale of fund shares.

Performance Table Narrative

rr_PerformanceTableNarrativeTextBlock

After-tax returns are calculated using the historical highest individual federal marginal income tax rates, but do not reflect the impact of state or local taxes. Actual after-tax returns may differ depending on your individual circumstances. The after-tax returns shown are not relevant if you hold your shares in a retirement account or in another tax-deferred arrangement, such as an employee benefit plan (profit sharing, 401(k), or 403(b) plan). Return After Taxes on Distributions and Sale of Fund Shares may be higher than other returns for the same period due to a tax benefit of realizing a capital loss upon the sale of fund shares.

For the periods ended December 31, 2016

02.28 Select Portfolios: Group 1 Consumer Discretionary Sector Combo PRO-06 | Automotive Portfolio | Automotive Portfolio-Default

Risk/Return:

rr_RiskReturnAbstract

Redemption fee on shares held less than 30 days (as a % of amount redeemed)

rr_RedemptionFeeOverRedemption

0.75%

Management fee

rr_ManagementFeesOverAssets

0.55%

Distribution and/or Service (12b-1) fees

rr_DistributionAndService12b1FeesOverAssets

none

Other expenses

rr_OtherExpensesOverAssets

0.41%

Total annual operating expenses

rr_ExpensesOverAssets

0.96%

1 year

rr_ExpenseExampleYear01

$ 98

3 years

rr_ExpenseExampleYear03

306

5 years

rr_ExpenseExampleYear05

531

10 years

rr_ExpenseExampleYear10

$ 1,178

2007

rr_AnnualReturn2007

0.01%

2008

rr_AnnualReturn2008

(61.20%)

2009

rr_AnnualReturn2009

122.28%

2010

rr_AnnualReturn2010

46.18%

2011

rr_AnnualReturn2011

(26.16%)

2012

rr_AnnualReturn2012

26.17%

2013

rr_AnnualReturn2013

46.67%

2014

rr_AnnualReturn2014

2.79%

2015

rr_AnnualReturn2015

0.17%

2016

rr_AnnualReturn2016

(5.83%)

Year to Date Return, Label

rr_YearToDateReturnLabel

Year-to-Date Return

Bar Chart, Year to Date Return, Date

rr_BarChartYearToDateReturnDate

Mar. 31, 2017

Bar Chart, Year to Date Return

rr_BarChartYearToDateReturn

5.98%

Highest Quarterly Return, Label

rr_HighestQuarterlyReturnLabel

Highest Quarter Return

Highest Quarterly Return, Date

rr_BarChartHighestQuarterlyReturnDate

Jun. 30, 2009

Highest Quarterly Return

rr_BarChartHighestQuarterlyReturn

81.42%

Lowest Quarterly Return, Label

rr_LowestQuarterlyReturnLabel

Lowest Quarter Return

Lowest Quarterly Return, Date

rr_BarChartLowestQuarterlyReturnDate

Dec. 31, 2008

Lowest Quarterly Return

rr_BarChartLowestQuarterlyReturn

(44.67%)

02.28 Select Portfolios: Group 1 Consumer Discretionary Sector Combo PRO-06 | Automotive Portfolio | Return Before Taxes | Automotive Portfolio-Default

Risk/Return:

rr_RiskReturnAbstract

Column

rr_AverageAnnualReturnColumnName

Automotive Portfolio

Label

rr_AverageAnnualReturnLabel

Return Before Taxes

Past 1 year

rr_AverageAnnualReturnYear01

(5.83%)

Past 5 years

rr_AverageAnnualReturnYear05

12.40%

Past 10 years

rr_AverageAnnualReturnYear10

5.26%

02.28 Select Portfolios: Group 1 Consumer Discretionary Sector Combo PRO-06 | Automotive Portfolio | After Taxes on Distributions | Automotive Portfolio-Default

Risk/Return:

rr_RiskReturnAbstract

Column

rr_AverageAnnualReturnColumnName

Automotive Portfolio

Label

rr_AverageAnnualReturnLabel

Return After Taxes on Distributions

Past 1 year

rr_AverageAnnualReturnYear01

(7.32%)

Past 5 years

rr_AverageAnnualReturnYear05

9.95%

Past 10 years

rr_AverageAnnualReturnYear10

3.82%

02.28 Select Portfolios: Group 1 Consumer Discretionary Sector Combo PRO-06 | Automotive Portfolio | After Taxes on Distributions and Sales | Automotive Portfolio-Default

Risk/Return:

rr_RiskReturnAbstract

Column

rr_AverageAnnualReturnColumnName

Automotive Portfolio

Label

rr_AverageAnnualReturnLabel

Return After Taxes on Distributions and Sale of Fund Shares

Past 1 year

rr_AverageAnnualReturnYear01

(2.06%)

Past 5 years

rr_AverageAnnualReturnYear05

9.94%

Past 10 years

rr_AverageAnnualReturnYear10

4.15%

02.28 Select Portfolios: Group 1 Consumer Discretionary Sector Combo PRO-06 | Automotive Portfolio | S&P 500® Index(reflects no deduction for fees, expenses, or taxes)

Risk/Return:

rr_RiskReturnAbstract

Past 1 year

rr_AverageAnnualReturnYear01

11.96%

Past 5 years

rr_AverageAnnualReturnYear05

14.66%

Past 10 years

rr_AverageAnnualReturnYear10

6.95%

02.28 Select Portfolios: Group 1 Consumer Discretionary Sector Combo PRO-06 | Automotive Portfolio | S&P® Custom Automobiles & Components Index(reflects no deduction for fees, expenses, or taxes)

Risk/Return:

rr_RiskReturnAbstract

Past 1 year

rr_AverageAnnualReturnYear01

5.42%

Past 5 years

rr_AverageAnnualReturnYear05

14.96%

Past 10 years

rr_AverageAnnualReturnYear10

4.60%

XML

02.28 Select Portfolios: Group 1 Consumer Discretionary Sector Combo PRO-06 | Construction and Housing Portfolio

Fund Summary

Fund:
Construction and Housing Portfolio

Investment Objective

The fund seeks capital appreciation.

Fee Table

The following table describes the fees and expenses that may be incurred when you buy and hold shares of the fund.

Shareholder fees

(fees paid directly from your investment)

Shareholder Fees {- Construction and Housing Portfolio}	02.28 Select Portfolios: Group 1 Consumer Discretionary Sector Combo PRO-06 Construction and Housing Portfolio Construction and Housing Portfolio-Default
Redemption fee on shares held less than 30 days (as a % of amount redeemed)	0.75%

Annual Operating Expenses

(expenses that you pay each year as a % of the value of your investment)

Annual Operating Expenses {- Construction and Housing Portfolio}	02.28 Select Portfolios: Group 1 Consumer Discretionary Sector Combo PRO-06 Construction and Housing Portfolio Construction and Housing Portfolio-Default
Management fee	0.55%
Distribution and/or Service (12b-1) fees	none
Other expenses	0.25%
Total annual operating expenses	0.80%

This example helps compare the cost of investing in the fund with the cost of investing in other funds.

Let's say, hypothetically, that the annual return for shares of the fund is 5% and that your shareholder fees and the annual operating expenses for shares of the fund are exactly as described in the fee table. This example illustrates the effect of fees and expenses, but is not meant to suggest actual or expected fees and expenses or returns, all of which may vary. For every $10,000 you invested, here's how much you would pay in total expenses if you sell all of your shares at the end of each time period indicated:

Sell All Shares

Expense Example {- Construction and Housing Portfolio}	02.28 Select Portfolios: Group 1 Consumer Discretionary Sector Combo PRO-06 Construction and Housing Portfolio Construction and Housing Portfolio-Default USD ($)
1 year	$ 82
3 years	255
5 years	444
10 years	$ 990

Portfolio Turnover

The fund pays transaction costs, such as commissions, when it buys and sells securities (or "turns over" its portfolio). A higher portfolio turnover rate may indicate higher transaction costs and may result in higher taxes when fund shares are held in a taxable account. These costs, which are not reflected in annual operating expenses or in the example, affect the fund's performance. During the most recent fiscal year, the fund's portfolio turnover rate was 87% of the average value of its portfolio.

Principal Investment Strategies

• Normally investing primarily in common stocks.

• Normally investing at least 80% of assets in securities of companies principally engaged in the design and construction of residential, commercial, industrial, and public works facilities, as well as companies engaged in the manufacture, supply, distribution, or sale of construction and housing products or services.

• Investing in domestic and foreign issuers.

• Using fundamental analysis of factors such as each issuer's financial condition and industry position, as well as market and economic conditions, to select investments.

Principal Investment Risks

• Stock Market Volatility. Stock markets are volatile and can decline significantly in response to adverse issuer, political, regulatory, market, or economic developments. Different parts of the market, including different market sectors, and different types of securities can react differently to these developments.

• Foreign Exposure. Foreign markets can be more volatile than the U.S. market due to increased risks of adverse issuer, political, regulatory, market, or economic developments and can perform differently from the U.S. market.

• Construction and Housing Industry Concentration. The construction and housing industry can be significantly affected by changes in housing starts, the level of new and existing home sales, government spending, public works, interest rates, consumer confidence and spending, taxation, and demographic patterns.

• Issuer-Specific Changes. The value of an individual security or particular type of security can be more volatile than, and can perform differently from, the market as a whole. The value of securities of smaller issuers can be more volatile than that of larger issuers.

In addition, the fund is considered non-diversified and can invest a greater portion of assets in securities of a smaller number of individual issuers than a diversified fund. As a result, changes in the market value of a single investment could cause greater fluctuations in share price than would occur in a more diversified fund.

An investment in the fund is not a deposit of a bank and is not insured or guaranteed by the Federal Deposit Insurance Corporation or any other government agency. You could lose money by investing in the fund.

Performance

The following information is intended to help you understand the risks of investing in the fund. The information illustrates the changes in the performance of the fund's shares from year to year and compares the performance of the fund's shares to the performance of a securities market index and an additional index over various periods of time. The indexes have characteristics relevant to the fund's investment strategies. Index descriptions appear in the Additional Index Information section of the prospectus. Past performance (before and after taxes) is not an indication of future performance.

Visit www.fidelity.com for more recent performance information.

Year-by-Year Returns

Calendar Years

During the periods shown in the chart:	Returns	Quarter ended
Highest Quarter Return	24.65%	December 31, 2011
Lowest Quarter Return	-19.41%	September 30, 2011
Year-to-Date Return	6.83%	March 31, 2017

Average Annual Returns

After-tax returns are calculated using the historical highest individual federal marginal income tax rates, but do not reflect the impact of state or local taxes. Actual after-tax returns may differ depending on your individual circumstances. The after-tax returns shown are not relevant if you hold your shares in a retirement account or in another tax-deferred arrangement, such as an employee benefit plan (profit sharing, 401(k), or 403(b) plan).

For the periods ended December 31, 2016

Average Annual Total Returns{- Construction and Housing Portfolio} - 02.28 Select Portfolios: Group 1 Consumer Discretionary Sector Combo PRO-06 - Construction and Housing Portfolio	Past 1 year	Past 5 years	Past 10 years
Construction and Housing Portfolio-Default | Return Before Taxes	5.05%	16.82%	7.74%
Construction and Housing Portfolio-Default | After Taxes on Distributions	4.18%	15.31%	6.75%
Construction and Housing Portfolio-Default | After Taxes on Distributions and Sales	3.58%	13.44%	6.14%
S&P 500® Index(reflects no deduction for fees, expenses, or taxes)	11.96%	14.66%	6.95%
MSCI U.S. IMI Custom Construction & Housing 25-50 Index(reflects no deduction for fees, expenses, or taxes)	8.78%	19.25%	7.45%

XML

Label

Element

Value

Risk/Return:

rr_RiskReturnAbstract

Registrant Name

dei_EntityRegistrantName

FIDELITY SELECT PORTFOLIOS

Prospectus Date

rr_ProspectusDate

Apr. 29, 2017

02.28 Select Portfolios: Group 1 Consumer Discretionary Sector Combo PRO-06 | Construction and Housing Portfolio

Risk/Return:

rr_RiskReturnAbstract

Risk/Return [Heading]

rr_RiskReturnHeading

Fund Summary

Fund:
Construction and Housing Portfolio

Objective [Heading]

rr_ObjectiveHeading

Investment Objective

Objective, Primary [Text Block]

rr_ObjectivePrimaryTextBlock

The fund seeks capital appreciation.

Expense [Heading]

rr_ExpenseHeading

Fee Table

Expense Narrative [Text Block]

rr_ExpenseNarrativeTextBlock

The following table describes the fees and expenses that may be incurred when you buy and hold shares of the fund.

Shareholder Fees Caption [Text]

rr_ShareholderFeesCaption

Shareholder fees

(fees paid directly from your investment)

Operating Expenses Caption [Text]

rr_OperatingExpensesCaption

Annual Operating Expenses

(expenses that you pay each year as a % of the value of your investment)

Portfolio Turnover [Heading]

rr_PortfolioTurnoverHeading

Portfolio Turnover

Portfolio Turnover [Text Block]

rr_PortfolioTurnoverTextBlock

The fund pays transaction costs, such as commissions, when it buys and sells securities (or "turns over" its portfolio). A higher portfolio turnover rate may indicate higher transaction costs and may result in higher taxes when fund shares are held in a taxable account. These costs, which are not reflected in annual operating expenses or in the example, affect the fund's performance. During the most recent fiscal year, the fund's portfolio turnover rate was 87% of the average value of its portfolio.

Portfolio Turnover, Rate

rr_PortfolioTurnoverRate

87.00%

Expense Example Narrative [Text Block]

rr_ExpenseExampleNarrativeTextBlock

This example helps compare the cost of investing in the fund with the cost of investing in other funds.

Let's say, hypothetically, that the annual return for shares of the fund is 5% and that your shareholder fees and the annual operating expenses for shares of the fund are exactly as described in the fee table. This example illustrates the effect of fees and expenses, but is not meant to suggest actual or expected fees and expenses or returns, all of which may vary. For every $10,000 you invested, here's how much you would pay in total expenses if you sell all of your shares at the end of each time period indicated:

Expense Example by, Year, Caption [Text]

rr_ExpenseExampleByYearCaption

Sell All Shares

Strategy [Heading]

rr_StrategyHeading

Principal Investment Strategies

Strategy Narrative [Text Block]

rr_StrategyNarrativeTextBlock

• Normally investing primarily in common stocks.

• Normally investing at least 80% of assets in securities of companies principally engaged in the design and construction of residential, commercial, industrial, and public works facilities, as well as companies engaged in the manufacture, supply, distribution, or sale of construction and housing products or services.

• Investing in domestic and foreign issuers.

• Using fundamental analysis of factors such as each issuer's financial condition and industry position, as well as market and economic conditions, to select investments.

Strategy Portfolio Concentration [Text]

rr_StrategyPortfolioConcentration

Normally investing at least 80% of assets in securities of companies principally engaged in the design and construction of residential, commercial, industrial, and public works facilities, as well as companies engaged in the manufacture, supply, distribution, or sale of construction and housing products or services.

Risk [Heading]

rr_RiskHeading

Principal Investment Risks

Risk Narrative [Text Block]

rr_RiskNarrativeTextBlock

• Stock Market Volatility. Stock markets are volatile and can decline significantly in response to adverse issuer, political, regulatory, market, or economic developments. Different parts of the market, including different market sectors, and different types of securities can react differently to these developments.

• Foreign Exposure. Foreign markets can be more volatile than the U.S. market due to increased risks of adverse issuer, political, regulatory, market, or economic developments and can perform differently from the U.S. market.

• Construction and Housing Industry Concentration. The construction and housing industry can be significantly affected by changes in housing starts, the level of new and existing home sales, government spending, public works, interest rates, consumer confidence and spending, taxation, and demographic patterns.

• Issuer-Specific Changes. The value of an individual security or particular type of security can be more volatile than, and can perform differently from, the market as a whole. The value of securities of smaller issuers can be more volatile than that of larger issuers.

In addition, the fund is considered non-diversified and can invest a greater portion of assets in securities of a smaller number of individual issuers than a diversified fund. As a result, changes in the market value of a single investment could cause greater fluctuations in share price than would occur in a more diversified fund.

An investment in the fund is not a deposit of a bank and is not insured or guaranteed by the Federal Deposit Insurance Corporation or any other government agency. You could lose money by investing in the fund.

Risk Lose Money [Text]

rr_RiskLoseMoney

You could lose money by investing in the fund.

Risk Nondiversified Status [Text]

rr_RiskNondiversifiedStatus

In addition, the fund is considered non-diversified and can invest a greater portion of assets in securities of a smaller number of individual issuers than a diversified fund. As a result, changes in the market value of a single investment could cause greater fluctuations in share price than would occur in a more diversified fund.

Risk Not Insured Depository Institution [Text]

rr_RiskNotInsuredDepositoryInstitution

An investment in the fund is not a deposit of a bank and is not insured or guaranteed by the Federal Deposit Insurance Corporation or any other government agency.

Bar Chart and Performance Table [Heading]

rr_BarChartAndPerformanceTableHeading

Performance

Performance Narrative [Text Block]

rr_PerformanceNarrativeTextBlock

The following information is intended to help you understand the risks of investing in the fund. The information illustrates the changes in the performance of the fund's shares from year to year and compares the performance of the fund's shares to the performance of a securities market index and an additional index over various periods of time. The indexes have characteristics relevant to the fund's investment strategies. Index descriptions appear in the Additional Index Information section of the prospectus. Past performance (before and after taxes) is not an indication of future performance.

Visit www.fidelity.com for more recent performance information.

Performance Information Illustrates Variability of Returns [Text]

rr_PerformanceInformationIllustratesVariabilityOfReturns

The information illustrates the changes in the performance of the fund's shares from year to year and compares the performance of the fund's shares to the performance of a securities market index and an additional index over various periods of time.

Performance Availability Website Address [Text]

rr_PerformanceAvailabilityWebSiteAddress

www.fidelity.com

Performance Past Does Not Indicate Future [Text]

rr_PerformancePastDoesNotIndicateFuture

Past performance (before and after taxes) is not an indication of future performance.

Bar Chart [Heading]

rr_BarChartHeading

Year-by-Year Returns

Calendar Years

Bar Chart Closing [Text Block]

rr_BarChartClosingTextBlock

During the periods shown in the chart:	Returns	Quarter ended
Highest Quarter Return	24.65%	December 31, 2011
Lowest Quarter Return	-19.41%	September 30, 2011
Year-to-Date Return	6.83%	March 31, 2017

Performance Table Heading

rr_PerformanceTableHeading

Average Annual Returns

Performance Table Uses Highest Federal Rate

rr_PerformanceTableUsesHighestFederalRate

After-tax returns are calculated using the historical highest individual federal marginal income tax rates, but do not reflect the impact of state or local taxes.

Performance Table Not Relevant to Tax Deferred

rr_PerformanceTableNotRelevantToTaxDeferred

The after-tax returns shown are not relevant if you hold your shares in a retirement account or in another tax-deferred arrangement, such as an employee benefit plan (profit sharing, 401(k), or 403(b) plan).

Performance Table Narrative

rr_PerformanceTableNarrativeTextBlock

After-tax returns are calculated using the historical highest individual federal marginal income tax rates, but do not reflect the impact of state or local taxes. Actual after-tax returns may differ depending on your individual circumstances. The after-tax returns shown are not relevant if you hold your shares in a retirement account or in another tax-deferred arrangement, such as an employee benefit plan (profit sharing, 401(k), or 403(b) plan).

For the periods ended December 31, 2016

02.28 Select Portfolios: Group 1 Consumer Discretionary Sector Combo PRO-06 | Construction and Housing Portfolio | Construction and Housing Portfolio-Default

Risk/Return:

rr_RiskReturnAbstract

Redemption fee on shares held less than 30 days (as a % of amount redeemed)

rr_RedemptionFeeOverRedemption

0.75%

Management fee

rr_ManagementFeesOverAssets

0.55%

Distribution and/or Service (12b-1) fees

rr_DistributionAndService12b1FeesOverAssets

none

Other expenses

rr_OtherExpensesOverAssets

0.25%

Total annual operating expenses

rr_ExpensesOverAssets

0.80%

1 year

rr_ExpenseExampleYear01

$ 82

3 years

rr_ExpenseExampleYear03

255

5 years

rr_ExpenseExampleYear05

444

10 years

rr_ExpenseExampleYear10

$ 990

2007

rr_AnnualReturn2007

(13.87%)

2008

rr_AnnualReturn2008

(26.81%)

2009

rr_AnnualReturn2009

22.92%

2010

rr_AnnualReturn2010

21.54%

2011

rr_AnnualReturn2011

2.89%

2012

rr_AnnualReturn2012

38.01%

2013

rr_AnnualReturn2013

21.25%

2014

rr_AnnualReturn2014

15.74%

2015

rr_AnnualReturn2015

6.91%

2016

rr_AnnualReturn2016

5.05%

Year to Date Return, Label

rr_YearToDateReturnLabel

Year-to-Date Return

Bar Chart, Year to Date Return, Date

rr_BarChartYearToDateReturnDate

Mar. 31, 2017

Bar Chart, Year to Date Return

rr_BarChartYearToDateReturn

6.83%

Highest Quarterly Return, Label

rr_HighestQuarterlyReturnLabel

Highest Quarter Return

Highest Quarterly Return, Date

rr_BarChartHighestQuarterlyReturnDate

Dec. 31, 2011

Highest Quarterly Return

rr_BarChartHighestQuarterlyReturn

24.65%

Lowest Quarterly Return, Label

rr_LowestQuarterlyReturnLabel

Lowest Quarter Return

Lowest Quarterly Return, Date

rr_BarChartLowestQuarterlyReturnDate

Sep. 30, 2011

Lowest Quarterly Return

rr_BarChartLowestQuarterlyReturn

(19.41%)

02.28 Select Portfolios: Group 1 Consumer Discretionary Sector Combo PRO-06 | Construction and Housing Portfolio | Return Before Taxes | Construction and Housing Portfolio-Default

Risk/Return:

rr_RiskReturnAbstract

Column

rr_AverageAnnualReturnColumnName

Construction and Housing Portfolio

Label

rr_AverageAnnualReturnLabel

Return Before Taxes

Past 1 year

rr_AverageAnnualReturnYear01

5.05%

Past 5 years

rr_AverageAnnualReturnYear05

16.82%

Past 10 years

rr_AverageAnnualReturnYear10

7.74%

02.28 Select Portfolios: Group 1 Consumer Discretionary Sector Combo PRO-06 | Construction and Housing Portfolio | After Taxes on Distributions | Construction and Housing Portfolio-Default

Risk/Return:

rr_RiskReturnAbstract

Column

rr_AverageAnnualReturnColumnName

Construction and Housing Portfolio

Label

rr_AverageAnnualReturnLabel

Return After Taxes on Distributions

Past 1 year

rr_AverageAnnualReturnYear01

4.18%

Past 5 years

rr_AverageAnnualReturnYear05

15.31%

Past 10 years

rr_AverageAnnualReturnYear10

6.75%

02.28 Select Portfolios: Group 1 Consumer Discretionary Sector Combo PRO-06 | Construction and Housing Portfolio | After Taxes on Distributions and Sales | Construction and Housing Portfolio-Default

Risk/Return:

rr_RiskReturnAbstract

Column

rr_AverageAnnualReturnColumnName

Construction and Housing Portfolio

Label

rr_AverageAnnualReturnLabel

Return After Taxes on Distributions and Sale of Fund Shares

Past 1 year

rr_AverageAnnualReturnYear01

3.58%

Past 5 years

rr_AverageAnnualReturnYear05

13.44%

Past 10 years

rr_AverageAnnualReturnYear10

6.14%

02.28 Select Portfolios: Group 1 Consumer Discretionary Sector Combo PRO-06 | Construction and Housing Portfolio | S&P 500® Index(reflects no deduction for fees, expenses, or taxes)

Risk/Return:

rr_RiskReturnAbstract

Past 1 year

rr_AverageAnnualReturnYear01

11.96%

Past 5 years

rr_AverageAnnualReturnYear05

14.66%

Past 10 years

rr_AverageAnnualReturnYear10

6.95%

02.28 Select Portfolios: Group 1 Consumer Discretionary Sector Combo PRO-06 | Construction and Housing Portfolio | MSCI U.S. IMI Custom Construction & Housing 25-50 Index(reflects no deduction for fees, expenses, or taxes)

Risk/Return:

rr_RiskReturnAbstract

Past 1 year

rr_AverageAnnualReturnYear01

8.78%

Past 5 years

rr_AverageAnnualReturnYear05

19.25%

Past 10 years

rr_AverageAnnualReturnYear10

7.45%

XML

02.28 Select Portfolios: Group 1 Consumer Discretionary Sector Combo PRO-06 | Consumer Discretionary Portfolio

Fund Summary

Fund:
Consumer Discretionary Portfolio

Investment Objective

The fund seeks capital appreciation.

Fee Table

The following table describes the fees and expenses that may be incurred when you buy and hold shares of the fund.

Shareholder fees

Shareholder Fees {- Consumer Discretionary Portfolio}	02.28 Select Portfolios: Group 1 Consumer Discretionary Sector Combo PRO-06 Consumer Discretionary Portfolio USD ($)
(fees paid directly from your investment)	none

Annual Operating Expenses

(expenses that you pay each year as a % of the value of your investment)

Annual Operating Expenses {- Consumer Discretionary Portfolio}	02.28 Select Portfolios: Group 1 Consumer Discretionary Sector Combo PRO-06 Consumer Discretionary Portfolio Consumer Discretionary Portfolio-Default
Management fee	0.55%
Distribution and/or Service (12b-1) fees	none
Other expenses	0.21%
Total annual operating expenses	0.76%

This example helps compare the cost of investing in the fund with the cost of investing in other funds.

Let's say, hypothetically, that the annual return for shares of the fund is 5% and that your shareholder fees and the annual operating expenses for shares of the fund are exactly as described in the fee table. This example illustrates the effect of fees and expenses, but is not meant to suggest actual or expected fees and expenses or returns, all of which may vary. For every $10,000 you invested, here's how much you would pay in total expenses if you sell all of your shares at the end of each time period indicated:

Sell All Shares

Expense Example {- Consumer Discretionary Portfolio}	02.28 Select Portfolios: Group 1 Consumer Discretionary Sector Combo PRO-06 Consumer Discretionary Portfolio Consumer Discretionary Portfolio-Default USD ($)
1 year	$ 78
3 years	243
5 years	422
10 years	$ 942

Portfolio Turnover

The fund pays transaction costs, such as commissions, when it buys and sells securities (or "turns over" its portfolio). A higher portfolio turnover rate may indicate higher transaction costs and may result in higher taxes when fund shares are held in a taxable account. These costs, which are not reflected in annual operating expenses or in the example, affect the fund's performance. During the most recent fiscal year, the fund's portfolio turnover rate was 39% of the average value of its portfolio.

Principal Investment Strategies

• Normally investing primarily in common stocks.

• Normally investing at least 80% of assets in securities of companies principally engaged in the manufacture and distribution of consumer discretionary products and services.

• Investing in domestic and foreign issuers.

• Using fundamental analysis of factors such as each issuer's financial condition and industry position, as well as market and economic conditions, to select investments.

Principal Investment Risks

• Stock Market Volatility. Stock markets are volatile and can decline significantly in response to adverse issuer, political, regulatory, market, or economic developments. Different parts of the market, including different market sectors, and different types of securities can react differently to these developments.

• Foreign Exposure. Foreign markets can be more volatile than the U.S. market due to increased risks of adverse issuer, political, regulatory, market, or economic developments and can perform differently from the U.S. market.

• Consumer Discretionary Industry Concentration. The consumer discretionary industries can be significantly affected by the performance of the overall economy, interest rates, competition, consumer confidence and spending, and changes in demographics and consumer tastes.

• Issuer-Specific Changes. The value of an individual security or particular type of security can be more volatile than, and can perform differently from, the market as a whole. The value of securities of smaller issuers can be more volatile than that of larger issuers.

In addition, the fund is considered non-diversified and can invest a greater portion of assets in securities of a smaller number of individual issuers than a diversified fund. As a result, changes in the market value of a single investment could cause greater fluctuations in share price than would occur in a more diversified fund.

An investment in the fund is not a deposit of a bank and is not insured or guaranteed by the Federal Deposit Insurance Corporation or any other government agency. You could lose money by investing in the fund.

Performance

The following information is intended to help you understand the risks of investing in the fund. The information illustrates the changes in the performance of the fund's shares from year to year and compares the performance of the fund's shares to the performance of a securities market index and an additional index over various periods of time. The indexes have characteristics relevant to the fund's investment strategies. Index descriptions appear in the Additional Index Information section of the prospectus. Past performance (before and after taxes) is not an indication of future performance.

Visit www.fidelity.com for more recent performance information.

Year-by-Year Returns

Calendar Years

During the periods shown in the chart:	Returns	Quarter ended
Highest Quarter Return	18.12%	September 30, 2009
Lowest Quarter Return	-22.55%	December 31, 2008
Year-to-Date Return	6.73%	March 31, 2017

Average Annual Returns

After-tax returns are calculated using the historical highest individual federal marginal income tax rates, but do not reflect the impact of state or local taxes. Actual after-tax returns may differ depending on your individual circumstances. The after-tax returns shown are not relevant if you hold your shares in a retirement account or in another tax-deferred arrangement, such as an employee benefit plan (profit sharing, 401(k), or 403(b) plan).

For the periods ended December 31, 2016

Average Annual Total Returns{- Consumer Discretionary Portfolio} - 02.28 Select Portfolios: Group 1 Consumer Discretionary Sector Combo PRO-06 - Consumer Discretionary Portfolio	Past 1 year	Past 5 years	Past 10 years
Consumer Discretionary Portfolio-Default | Return Before Taxes	4.35%	15.67%	8.27%
Consumer Discretionary Portfolio-Default | After Taxes on Distributions	4.13%	14.02%	7.12%
Consumer Discretionary Portfolio-Default | After Taxes on Distributions and Sales	2.65%	12.31%	6.47%
S&P 500® Index(reflects no deduction for fees, expenses, or taxes)	11.96%	14.66%	6.95%
MSCI U.S. IMI Consumer Discretionary 25-50 Index(reflects no deduction for fees, expenses, or taxes)	6.72%	17.42%	9.34%

XML

Label

Element

Value

Risk/Return:

rr_RiskReturnAbstract

Registrant Name

dei_EntityRegistrantName

FIDELITY SELECT PORTFOLIOS

Prospectus Date

rr_ProspectusDate

Apr. 29, 2017

02.28 Select Portfolios: Group 1 Consumer Discretionary Sector Combo PRO-06 | Consumer Discretionary Portfolio

Risk/Return:

rr_RiskReturnAbstract

Risk/Return [Heading]

rr_RiskReturnHeading

Fund Summary

Fund:
Consumer Discretionary Portfolio

Objective [Heading]

rr_ObjectiveHeading

Investment Objective

Objective, Primary [Text Block]

rr_ObjectivePrimaryTextBlock

The fund seeks capital appreciation.

Expense [Heading]

rr_ExpenseHeading

Fee Table

Expense Narrative [Text Block]

rr_ExpenseNarrativeTextBlock

The following table describes the fees and expenses that may be incurred when you buy and hold shares of the fund.

Shareholder Fees Caption [Text]

rr_ShareholderFeesCaption

Shareholder fees

(fees paid directly from your investment)

rr_ShareholderFeeOther

none

Operating Expenses Caption [Text]

rr_OperatingExpensesCaption

Annual Operating Expenses

(expenses that you pay each year as a % of the value of your investment)

Portfolio Turnover [Heading]

rr_PortfolioTurnoverHeading

Portfolio Turnover

Portfolio Turnover [Text Block]

rr_PortfolioTurnoverTextBlock

The fund pays transaction costs, such as commissions, when it buys and sells securities (or "turns over" its portfolio). A higher portfolio turnover rate may indicate higher transaction costs and may result in higher taxes when fund shares are held in a taxable account. These costs, which are not reflected in annual operating expenses or in the example, affect the fund's performance. During the most recent fiscal year, the fund's portfolio turnover rate was 39% of the average value of its portfolio.

Portfolio Turnover, Rate

rr_PortfolioTurnoverRate

39.00%

Expense Example Narrative [Text Block]

rr_ExpenseExampleNarrativeTextBlock

This example helps compare the cost of investing in the fund with the cost of investing in other funds.

Let's say, hypothetically, that the annual return for shares of the fund is 5% and that your shareholder fees and the annual operating expenses for shares of the fund are exactly as described in the fee table. This example illustrates the effect of fees and expenses, but is not meant to suggest actual or expected fees and expenses or returns, all of which may vary. For every $10,000 you invested, here's how much you would pay in total expenses if you sell all of your shares at the end of each time period indicated:

Expense Example by, Year, Caption [Text]

rr_ExpenseExampleByYearCaption

Sell All Shares

Strategy [Heading]

rr_StrategyHeading

Principal Investment Strategies

Strategy Narrative [Text Block]

rr_StrategyNarrativeTextBlock

• Normally investing primarily in common stocks.

• Normally investing at least 80% of assets in securities of companies principally engaged in the manufacture and distribution of consumer discretionary products and services.

• Investing in domestic and foreign issuers.

• Using fundamental analysis of factors such as each issuer's financial condition and industry position, as well as market and economic conditions, to select investments.

Strategy Portfolio Concentration [Text]

rr_StrategyPortfolioConcentration

Normally investing at least 80% of assets in securities of companies principally engaged in the manufacture and distribution of consumer discretionary products and services.

Risk [Heading]

rr_RiskHeading

Principal Investment Risks

Risk Narrative [Text Block]

rr_RiskNarrativeTextBlock

• Stock Market Volatility. Stock markets are volatile and can decline significantly in response to adverse issuer, political, regulatory, market, or economic developments. Different parts of the market, including different market sectors, and different types of securities can react differently to these developments.

• Foreign Exposure. Foreign markets can be more volatile than the U.S. market due to increased risks of adverse issuer, political, regulatory, market, or economic developments and can perform differently from the U.S. market.

• Consumer Discretionary Industry Concentration. The consumer discretionary industries can be significantly affected by the performance of the overall economy, interest rates, competition, consumer confidence and spending, and changes in demographics and consumer tastes.

• Issuer-Specific Changes. The value of an individual security or particular type of security can be more volatile than, and can perform differently from, the market as a whole. The value of securities of smaller issuers can be more volatile than that of larger issuers.

In addition, the fund is considered non-diversified and can invest a greater portion of assets in securities of a smaller number of individual issuers than a diversified fund. As a result, changes in the market value of a single investment could cause greater fluctuations in share price than would occur in a more diversified fund.

An investment in the fund is not a deposit of a bank and is not insured or guaranteed by the Federal Deposit Insurance Corporation or any other government agency. You could lose money by investing in the fund.

Risk Lose Money [Text]

rr_RiskLoseMoney

You could lose money by investing in the fund.

Risk Nondiversified Status [Text]

rr_RiskNondiversifiedStatus

In addition, the fund is considered non-diversified and can invest a greater portion of assets in securities of a smaller number of individual issuers than a diversified fund. As a result, changes in the market value of a single investment could cause greater fluctuations in share price than would occur in a more diversified fund.

Risk Not Insured Depository Institution [Text]

rr_RiskNotInsuredDepositoryInstitution

An investment in the fund is not a deposit of a bank and is not insured or guaranteed by the Federal Deposit Insurance Corporation or any other government agency.

Bar Chart and Performance Table [Heading]

rr_BarChartAndPerformanceTableHeading

Performance

Performance Narrative [Text Block]

rr_PerformanceNarrativeTextBlock

The following information is intended to help you understand the risks of investing in the fund. The information illustrates the changes in the performance of the fund's shares from year to year and compares the performance of the fund's shares to the performance of a securities market index and an additional index over various periods of time. The indexes have characteristics relevant to the fund's investment strategies. Index descriptions appear in the Additional Index Information section of the prospectus. Past performance (before and after taxes) is not an indication of future performance.

Visit www.fidelity.com for more recent performance information.

Performance Information Illustrates Variability of Returns [Text]

rr_PerformanceInformationIllustratesVariabilityOfReturns

The information illustrates the changes in the performance of the fund's shares from year to year and compares the performance of the fund's shares to the performance of a securities market index and an additional index over various periods of time.

Performance Availability Website Address [Text]

rr_PerformanceAvailabilityWebSiteAddress

www.fidelity.com

Performance Past Does Not Indicate Future [Text]

rr_PerformancePastDoesNotIndicateFuture

Past performance (before and after taxes) is not an indication of future performance.

Bar Chart [Heading]

rr_BarChartHeading

Year-by-Year Returns

Calendar Years

Bar Chart Closing [Text Block]

rr_BarChartClosingTextBlock

During the periods shown in the chart:	Returns	Quarter ended
Highest Quarter Return	18.12%	September 30, 2009
Lowest Quarter Return	-22.55%	December 31, 2008
Year-to-Date Return	6.73%	March 31, 2017

Performance Table Heading

rr_PerformanceTableHeading

Average Annual Returns

Performance Table Uses Highest Federal Rate

rr_PerformanceTableUsesHighestFederalRate

After-tax returns are calculated using the historical highest individual federal marginal income tax rates, but do not reflect the impact of state or local taxes.

Performance Table Not Relevant to Tax Deferred

rr_PerformanceTableNotRelevantToTaxDeferred

The after-tax returns shown are not relevant if you hold your shares in a retirement account or in another tax-deferred arrangement, such as an employee benefit plan (profit sharing, 401(k), or 403(b) plan).

Performance Table Narrative

rr_PerformanceTableNarrativeTextBlock

After-tax returns are calculated using the historical highest individual federal marginal income tax rates, but do not reflect the impact of state or local taxes. Actual after-tax returns may differ depending on your individual circumstances. The after-tax returns shown are not relevant if you hold your shares in a retirement account or in another tax-deferred arrangement, such as an employee benefit plan (profit sharing, 401(k), or 403(b) plan).

For the periods ended December 31, 2016

02.28 Select Portfolios: Group 1 Consumer Discretionary Sector Combo PRO-06 | Consumer Discretionary Portfolio | Consumer Discretionary Portfolio-Default

Risk/Return:

rr_RiskReturnAbstract

Management fee

rr_ManagementFeesOverAssets

0.55%

Distribution and/or Service (12b-1) fees

rr_DistributionAndService12b1FeesOverAssets

none

Other expenses

rr_OtherExpensesOverAssets

0.21%

Total annual operating expenses

rr_ExpensesOverAssets

0.76%

1 year

rr_ExpenseExampleYear01

$ 78

3 years

rr_ExpenseExampleYear03

243

5 years

rr_ExpenseExampleYear05

422

10 years

rr_ExpenseExampleYear10

$ 942

2007

rr_AnnualReturn2007

(8.31%)

2008

rr_AnnualReturn2008

(34.64%)

2009

rr_AnnualReturn2009

38.12%

2010

rr_AnnualReturn2010

31.24%

2011

rr_AnnualReturn2011

(1.66%)

2012

rr_AnnualReturn2012

21.12%

2013

rr_AnnualReturn2013

41.03%

2014

rr_AnnualReturn2014

10.21%

2015

rr_AnnualReturn2015

5.43%

2016

rr_AnnualReturn2016

4.35%

Year to Date Return, Label

rr_YearToDateReturnLabel

Year-to-Date Return

Bar Chart, Year to Date Return, Date

rr_BarChartYearToDateReturnDate

Mar. 31, 2017

Bar Chart, Year to Date Return

rr_BarChartYearToDateReturn

6.73%

Highest Quarterly Return, Label

rr_HighestQuarterlyReturnLabel

Highest Quarter Return

Highest Quarterly Return, Date

rr_BarChartHighestQuarterlyReturnDate

Sep. 30, 2009

Highest Quarterly Return

rr_BarChartHighestQuarterlyReturn

18.12%

Lowest Quarterly Return, Label

rr_LowestQuarterlyReturnLabel

Lowest Quarter Return

Lowest Quarterly Return, Date

rr_BarChartLowestQuarterlyReturnDate

Dec. 31, 2008

Lowest Quarterly Return

rr_BarChartLowestQuarterlyReturn

(22.55%)

02.28 Select Portfolios: Group 1 Consumer Discretionary Sector Combo PRO-06 | Consumer Discretionary Portfolio | Return Before Taxes | Consumer Discretionary Portfolio-Default

Risk/Return:

rr_RiskReturnAbstract

Column

rr_AverageAnnualReturnColumnName

Consumer Discretionary Portfolio

Label

rr_AverageAnnualReturnLabel

Return Before Taxes

Past 1 year

rr_AverageAnnualReturnYear01

4.35%

Past 5 years

rr_AverageAnnualReturnYear05

15.67%

Past 10 years

rr_AverageAnnualReturnYear10

8.27%

02.28 Select Portfolios: Group 1 Consumer Discretionary Sector Combo PRO-06 | Consumer Discretionary Portfolio | After Taxes on Distributions | Consumer Discretionary Portfolio-Default

Risk/Return:

rr_RiskReturnAbstract

Column

rr_AverageAnnualReturnColumnName

Consumer Discretionary Portfolio

Label

rr_AverageAnnualReturnLabel

Return After Taxes on Distributions

Past 1 year

rr_AverageAnnualReturnYear01

4.13%

Past 5 years

rr_AverageAnnualReturnYear05

14.02%

Past 10 years

rr_AverageAnnualReturnYear10

7.12%

02.28 Select Portfolios: Group 1 Consumer Discretionary Sector Combo PRO-06 | Consumer Discretionary Portfolio | After Taxes on Distributions and Sales | Consumer Discretionary Portfolio-Default

Risk/Return:

rr_RiskReturnAbstract

Column

rr_AverageAnnualReturnColumnName

Consumer Discretionary Portfolio

Label

rr_AverageAnnualReturnLabel

Return After Taxes on Distributions and Sale of Fund Shares

Past 1 year

rr_AverageAnnualReturnYear01

2.65%

Past 5 years

rr_AverageAnnualReturnYear05

12.31%

Past 10 years

rr_AverageAnnualReturnYear10

6.47%

02.28 Select Portfolios: Group 1 Consumer Discretionary Sector Combo PRO-06 | Consumer Discretionary Portfolio | S&P 500® Index(reflects no deduction for fees, expenses, or taxes)

Risk/Return:

rr_RiskReturnAbstract

Past 1 year

rr_AverageAnnualReturnYear01

11.96%

Past 5 years

rr_AverageAnnualReturnYear05

14.66%

Past 10 years

rr_AverageAnnualReturnYear10

6.95%

02.28 Select Portfolios: Group 1 Consumer Discretionary Sector Combo PRO-06 | Consumer Discretionary Portfolio | MSCI U.S. IMI Consumer Discretionary 25-50 Index(reflects no deduction for fees, expenses, or taxes)

Risk/Return:

rr_RiskReturnAbstract

Past 1 year

rr_AverageAnnualReturnYear01

6.72%

Past 5 years

rr_AverageAnnualReturnYear05

17.42%

Past 10 years

rr_AverageAnnualReturnYear10

9.34%

XML

02.28 Select Portfolios: Group 1 Consumer Discretionary Sector Combo PRO-06 | Leisure Portfolio

Fund Summary

Fund:
Leisure Portfolio

Investment Objective

The fund seeks capital appreciation.

Fee Table

The following table describes the fees and expenses that may be incurred when you buy and hold shares of the fund.

Shareholder fees

(fees paid directly from your investment)

Shareholder Fees {- Leisure Portfolio}	02.28 Select Portfolios: Group 1 Consumer Discretionary Sector Combo PRO-06 Leisure Portfolio Leisure Portfolio-Default
Redemption fee on shares held less than 30 days (as a % of amount redeemed)	0.75%

Annual Operating Expenses

(expenses that you pay each year as a % of the value of your investment)

Annual Operating Expenses {- Leisure Portfolio}	02.28 Select Portfolios: Group 1 Consumer Discretionary Sector Combo PRO-06 Leisure Portfolio Leisure Portfolio-Default
Management fee	0.55%
Distribution and/or Service (12b-1) fees	none
Other expenses	0.25%
Total annual operating expenses	0.80%

This example helps compare the cost of investing in the fund with the cost of investing in other funds.

Let's say, hypothetically, that the annual return for shares of the fund is 5% and that your shareholder fees and the annual operating expenses for shares of the fund are exactly as described in the fee table. This example illustrates the effect of fees and expenses, but is not meant to suggest actual or expected fees and expenses or returns, all of which may vary. For every $10,000 you invested, here's how much you would pay in total expenses if you sell all of your shares at the end of each time period indicated:

Sell All Shares

Expense Example {- Leisure Portfolio}	02.28 Select Portfolios: Group 1 Consumer Discretionary Sector Combo PRO-06 Leisure Portfolio Leisure Portfolio-Default USD ($)
1 year	$ 82
3 years	255
5 years	444
10 years	$ 990

Portfolio Turnover

The fund pays transaction costs, such as commissions, when it buys and sells securities (or "turns over" its portfolio). A higher portfolio turnover rate may indicate higher transaction costs and may result in higher taxes when fund shares are held in a taxable account. These costs, which are not reflected in annual operating expenses or in the example, affect the fund's performance. During the most recent fiscal year, the fund's portfolio turnover rate was 23% of the average value of its portfolio.

Principal Investment Strategies

• Normally investing primarily in common stocks.

• Normally investing at least 80% of assets in securities of companies principally engaged in the design, production, or distribution of goods or services in the leisure industries.

• Investing in domestic and foreign issuers.

• Using fundamental analysis of factors such as each issuer's financial condition and industry position, as well as market and economic conditions, to select investments.

Principal Investment Risks

• Stock Market Volatility. Stock markets are volatile and can decline significantly in response to adverse issuer, political, regulatory, market, or economic developments. Different parts of the market, including different market sectors, and different types of securities can react differently to these developments.

• Foreign Exposure. Foreign markets can be more volatile than the U.S. market due to increased risks of adverse issuer, political, regulatory, market, or economic developments and can perform differently from the U.S. market.

• Leisure Industry Concentration. The leisure industry can be significantly affected by the performance of the overall economy, changing consumer tastes, intense competition, and government regulation.

• Issuer-Specific Changes. The value of an individual security or particular type of security can be more volatile than, and can perform differently from, the market as a whole. The value of securities of smaller issuers can be more volatile than that of larger issuers.

In addition, the fund is considered non-diversified and can invest a greater portion of assets in securities of a smaller number of individual issuers than a diversified fund. As a result, changes in the market value of a single investment could cause greater fluctuations in share price than would occur in a more diversified fund.

An investment in the fund is not a deposit of a bank and is not insured or guaranteed by the Federal Deposit Insurance Corporation or any other government agency. You could lose money by investing in the fund.

Performance

The following information is intended to help you understand the risks of investing in the fund. The information illustrates the changes in the performance of the fund's shares from year to year and compares the performance of the fund's shares to the performance of a securities market index and an additional index over various periods of time. The indexes have characteristics relevant to the fund's investment strategies. Index descriptions appear in the Additional Index Information section of the prospectus. Past performance (before and after taxes) is not an indication of future performance.

Visit www.fidelity.com for more recent performance information.

Year-by-Year Returns

Calendar Years

During the periods shown in the chart:	Returns	Quarter ended
Highest Quarter Return	15.87%	March 31, 2012
Lowest Quarter Return	-14.08%	September 30, 2011
Year-to-Date Return	7.10%	March 31, 2017

Average Annual Returns

After-tax returns are calculated using the historical highest individual federal marginal income tax rates, but do not reflect the impact of state or local taxes. Actual after-tax returns may differ depending on your individual circumstances. The after-tax returns shown are not relevant if you hold your shares in a retirement account or in another tax-deferred arrangement, such as an employee benefit plan (profit sharing, 401(k), or 403(b) plan).

For the periods ended December 31, 2016

Average Annual Total Returns{- Leisure Portfolio} - 02.28 Select Portfolios: Group 1 Consumer Discretionary Sector Combo PRO-06 - Leisure Portfolio	Past 1 year	Past 5 years	Past 10 years
Leisure Portfolio-Default | Return Before Taxes	6.35%	13.45%	9.68%
Leisure Portfolio-Default | After Taxes on Distributions	6.11%	11.96%	8.76%
Leisure Portfolio-Default | After Taxes on Distributions and Sales	3.81%	10.55%	7.79%
S&P 500® Index(reflects no deduction for fees, expenses, or taxes)	11.96%	14.66%	6.95%
MSCI U.S. IMI Consumer Services 25-50 Index(reflects no deduction for fees, expenses, or taxes)	8.55%	13.21%	9.16%

XML

Label

Element

Value

Risk/Return:

rr_RiskReturnAbstract

Registrant Name

dei_EntityRegistrantName

FIDELITY SELECT PORTFOLIOS

Prospectus Date

rr_ProspectusDate

Apr. 29, 2017

02.28 Select Portfolios: Group 1 Consumer Discretionary Sector Combo PRO-06 | Leisure Portfolio

Risk/Return:

rr_RiskReturnAbstract

Risk/Return [Heading]

rr_RiskReturnHeading

Fund Summary

Fund:
Leisure Portfolio

Objective [Heading]

rr_ObjectiveHeading

Investment Objective

Objective, Primary [Text Block]

rr_ObjectivePrimaryTextBlock

The fund seeks capital appreciation.

Expense [Heading]

rr_ExpenseHeading

Fee Table

Expense Narrative [Text Block]

rr_ExpenseNarrativeTextBlock

The following table describes the fees and expenses that may be incurred when you buy and hold shares of the fund.

Shareholder Fees Caption [Text]

rr_ShareholderFeesCaption

Shareholder fees

(fees paid directly from your investment)

Operating Expenses Caption [Text]

rr_OperatingExpensesCaption

Annual Operating Expenses

(expenses that you pay each year as a % of the value of your investment)

Portfolio Turnover [Heading]

rr_PortfolioTurnoverHeading

Portfolio Turnover

Portfolio Turnover [Text Block]

rr_PortfolioTurnoverTextBlock

The fund pays transaction costs, such as commissions, when it buys and sells securities (or "turns over" its portfolio). A higher portfolio turnover rate may indicate higher transaction costs and may result in higher taxes when fund shares are held in a taxable account. These costs, which are not reflected in annual operating expenses or in the example, affect the fund's performance. During the most recent fiscal year, the fund's portfolio turnover rate was 23% of the average value of its portfolio.

Portfolio Turnover, Rate

rr_PortfolioTurnoverRate

23.00%

Expense Example Narrative [Text Block]

rr_ExpenseExampleNarrativeTextBlock

This example helps compare the cost of investing in the fund with the cost of investing in other funds.

Let's say, hypothetically, that the annual return for shares of the fund is 5% and that your shareholder fees and the annual operating expenses for shares of the fund are exactly as described in the fee table. This example illustrates the effect of fees and expenses, but is not meant to suggest actual or expected fees and expenses or returns, all of which may vary. For every $10,000 you invested, here's how much you would pay in total expenses if you sell all of your shares at the end of each time period indicated:

Expense Example by, Year, Caption [Text]

rr_ExpenseExampleByYearCaption

Sell All Shares

Strategy [Heading]

rr_StrategyHeading

Principal Investment Strategies

Strategy Narrative [Text Block]

rr_StrategyNarrativeTextBlock

• Normally investing primarily in common stocks.

• Normally investing at least 80% of assets in securities of companies principally engaged in the design, production, or distribution of goods or services in the leisure industries.

• Investing in domestic and foreign issuers.

• Using fundamental analysis of factors such as each issuer's financial condition and industry position, as well as market and economic conditions, to select investments.

Strategy Portfolio Concentration [Text]

rr_StrategyPortfolioConcentration

Normally investing at least 80% of assets in securities of companies principally engaged in the design, production, or distribution of goods or services in the leisure industries.

Risk [Heading]

rr_RiskHeading

Principal Investment Risks

Risk Narrative [Text Block]

rr_RiskNarrativeTextBlock

• Stock Market Volatility. Stock markets are volatile and can decline significantly in response to adverse issuer, political, regulatory, market, or economic developments. Different parts of the market, including different market sectors, and different types of securities can react differently to these developments.

• Foreign Exposure. Foreign markets can be more volatile than the U.S. market due to increased risks of adverse issuer, political, regulatory, market, or economic developments and can perform differently from the U.S. market.

• Leisure Industry Concentration. The leisure industry can be significantly affected by the performance of the overall economy, changing consumer tastes, intense competition, and government regulation.

• Issuer-Specific Changes. The value of an individual security or particular type of security can be more volatile than, and can perform differently from, the market as a whole. The value of securities of smaller issuers can be more volatile than that of larger issuers.

In addition, the fund is considered non-diversified and can invest a greater portion of assets in securities of a smaller number of individual issuers than a diversified fund. As a result, changes in the market value of a single investment could cause greater fluctuations in share price than would occur in a more diversified fund.

An investment in the fund is not a deposit of a bank and is not insured or guaranteed by the Federal Deposit Insurance Corporation or any other government agency. You could lose money by investing in the fund.

Risk Lose Money [Text]

rr_RiskLoseMoney

You could lose money by investing in the fund.

Risk Nondiversified Status [Text]

rr_RiskNondiversifiedStatus

In addition, the fund is considered non-diversified and can invest a greater portion of assets in securities of a smaller number of individual issuers than a diversified fund. As a result, changes in the market value of a single investment could cause greater fluctuations in share price than would occur in a more diversified fund.

Risk Not Insured Depository Institution [Text]

rr_RiskNotInsuredDepositoryInstitution

An investment in the fund is not a deposit of a bank and is not insured or guaranteed by the Federal Deposit Insurance Corporation or any other government agency.

Bar Chart and Performance Table [Heading]

rr_BarChartAndPerformanceTableHeading

Performance

Performance Narrative [Text Block]

rr_PerformanceNarrativeTextBlock

The following information is intended to help you understand the risks of investing in the fund. The information illustrates the changes in the performance of the fund's shares from year to year and compares the performance of the fund's shares to the performance of a securities market index and an additional index over various periods of time. The indexes have characteristics relevant to the fund's investment strategies. Index descriptions appear in the Additional Index Information section of the prospectus. Past performance (before and after taxes) is not an indication of future performance.

Visit www.fidelity.com for more recent performance information.

Performance Information Illustrates Variability of Returns [Text]

rr_PerformanceInformationIllustratesVariabilityOfReturns

The information illustrates the changes in the performance of the fund's shares from year to year and compares the performance of the fund's shares to the performance of a securities market index and an additional index over various periods of time.

Performance Availability Website Address [Text]

rr_PerformanceAvailabilityWebSiteAddress

www.fidelity.com

Performance Past Does Not Indicate Future [Text]

rr_PerformancePastDoesNotIndicateFuture

Past performance (before and after taxes) is not an indication of future performance.

Bar Chart [Heading]

rr_BarChartHeading

Year-by-Year Returns

Calendar Years

Bar Chart Closing [Text Block]

rr_BarChartClosingTextBlock

During the periods shown in the chart:	Returns	Quarter ended
Highest Quarter Return	15.87%	March 31, 2012
Lowest Quarter Return	-14.08%	September 30, 2011
Year-to-Date Return	7.10%	March 31, 2017

Performance Table Heading

rr_PerformanceTableHeading

Average Annual Returns

Performance Table Uses Highest Federal Rate

rr_PerformanceTableUsesHighestFederalRate

After-tax returns are calculated using the historical highest individual federal marginal income tax rates, but do not reflect the impact of state or local taxes.

Performance Table Not Relevant to Tax Deferred

rr_PerformanceTableNotRelevantToTaxDeferred

The after-tax returns shown are not relevant if you hold your shares in a retirement account or in another tax-deferred arrangement, such as an employee benefit plan (profit sharing, 401(k), or 403(b) plan).

Performance Table Narrative

rr_PerformanceTableNarrativeTextBlock

After-tax returns are calculated using the historical highest individual federal marginal income tax rates, but do not reflect the impact of state or local taxes. Actual after-tax returns may differ depending on your individual circumstances. The after-tax returns shown are not relevant if you hold your shares in a retirement account or in another tax-deferred arrangement, such as an employee benefit plan (profit sharing, 401(k), or 403(b) plan).

For the periods ended December 31, 2016

02.28 Select Portfolios: Group 1 Consumer Discretionary Sector Combo PRO-06 | Leisure Portfolio | Leisure Portfolio-Default

Risk/Return:

rr_RiskReturnAbstract

Redemption fee on shares held less than 30 days (as a % of amount redeemed)

rr_RedemptionFeeOverRedemption

0.75%

Management fee

rr_ManagementFeesOverAssets

0.55%

Distribution and/or Service (12b-1) fees

rr_DistributionAndService12b1FeesOverAssets

none

Other expenses

rr_OtherExpensesOverAssets

0.25%

Total annual operating expenses

rr_ExpensesOverAssets

0.80%

1 year

rr_ExpenseExampleYear01

$ 82

3 years

rr_ExpenseExampleYear03

255

5 years

rr_ExpenseExampleYear05

444

10 years

rr_ExpenseExampleYear10

$ 990

2007

rr_AnnualReturn2007

4.19%

2008

rr_AnnualReturn2008

(29.05%)

2009

rr_AnnualReturn2009

24.25%

2010

rr_AnnualReturn2010

37.88%

2011

rr_AnnualReturn2011

5.85%

2012

rr_AnnualReturn2012

11.40%

2013

rr_AnnualReturn2013

41.72%

2014

rr_AnnualReturn2014

8.33%

2015

rr_AnnualReturn2015

3.32%

2016

rr_AnnualReturn2016

6.35%

Year to Date Return, Label

rr_YearToDateReturnLabel

Year-to-Date Return

Bar Chart, Year to Date Return, Date

rr_BarChartYearToDateReturnDate

Mar. 31, 2017

Bar Chart, Year to Date Return

rr_BarChartYearToDateReturn

7.10%

Highest Quarterly Return, Label

rr_HighestQuarterlyReturnLabel

Highest Quarter Return

Highest Quarterly Return, Date

rr_BarChartHighestQuarterlyReturnDate

Mar. 31, 2012

Highest Quarterly Return

rr_BarChartHighestQuarterlyReturn

15.87%

Lowest Quarterly Return, Label

rr_LowestQuarterlyReturnLabel

Lowest Quarter Return

Lowest Quarterly Return, Date

rr_BarChartLowestQuarterlyReturnDate

Sep. 30, 2011

Lowest Quarterly Return

rr_BarChartLowestQuarterlyReturn

(14.08%)

02.28 Select Portfolios: Group 1 Consumer Discretionary Sector Combo PRO-06 | Leisure Portfolio | Return Before Taxes | Leisure Portfolio-Default

Risk/Return:

rr_RiskReturnAbstract

Column

rr_AverageAnnualReturnColumnName

Leisure Portfolio

Label

rr_AverageAnnualReturnLabel

Return Before Taxes

Past 1 year

rr_AverageAnnualReturnYear01

6.35%

Past 5 years

rr_AverageAnnualReturnYear05

13.45%

Past 10 years

rr_AverageAnnualReturnYear10

9.68%

02.28 Select Portfolios: Group 1 Consumer Discretionary Sector Combo PRO-06 | Leisure Portfolio | After Taxes on Distributions | Leisure Portfolio-Default

Risk/Return:

rr_RiskReturnAbstract

Column

rr_AverageAnnualReturnColumnName

Leisure Portfolio

Label

rr_AverageAnnualReturnLabel

Return After Taxes on Distributions

Past 1 year

rr_AverageAnnualReturnYear01

6.11%

Past 5 years

rr_AverageAnnualReturnYear05

11.96%

Past 10 years

rr_AverageAnnualReturnYear10

8.76%

02.28 Select Portfolios: Group 1 Consumer Discretionary Sector Combo PRO-06 | Leisure Portfolio | After Taxes on Distributions and Sales | Leisure Portfolio-Default

Risk/Return:

rr_RiskReturnAbstract

Column

rr_AverageAnnualReturnColumnName

Leisure Portfolio

Label

rr_AverageAnnualReturnLabel

Return After Taxes on Distributions and Sale of Fund Shares

Past 1 year

rr_AverageAnnualReturnYear01

3.81%

Past 5 years

rr_AverageAnnualReturnYear05

10.55%

Past 10 years

rr_AverageAnnualReturnYear10

7.79%

02.28 Select Portfolios: Group 1 Consumer Discretionary Sector Combo PRO-06 | Leisure Portfolio | S&P 500® Index(reflects no deduction for fees, expenses, or taxes)

Risk/Return:

rr_RiskReturnAbstract

Past 1 year

rr_AverageAnnualReturnYear01

11.96%

Past 5 years

rr_AverageAnnualReturnYear05

14.66%

Past 10 years

rr_AverageAnnualReturnYear10

6.95%

02.28 Select Portfolios: Group 1 Consumer Discretionary Sector Combo PRO-06 | Leisure Portfolio | MSCI U.S. IMI Consumer Services 25-50 Index(reflects no deduction for fees, expenses, or taxes)

Risk/Return:

rr_RiskReturnAbstract

Past 1 year

rr_AverageAnnualReturnYear01

8.55%

Past 5 years

rr_AverageAnnualReturnYear05

13.21%

Past 10 years

rr_AverageAnnualReturnYear10

9.16%

XML

02.28 Select Portfolios: Group 1 Consumer Discretionary Sector Combo PRO-06 | Multimedia Portfolio

Fund Summary

Fund:
Multimedia Portfolio

Investment Objective

The fund seeks capital appreciation.

Fee Table

The following table describes the fees and expenses that may be incurred when you buy and hold shares of the fund.

Shareholder fees

(fees paid directly from your investment)

Shareholder Fees {- Multimedia Portfolio}	02.28 Select Portfolios: Group 1 Consumer Discretionary Sector Combo PRO-06 Multimedia Portfolio Multimedia Portfolio-Default
Redemption fee on shares held less than 30 days (as a % of amount redeemed)	0.75%

Annual Operating Expenses

(expenses that you pay each year as a % of the value of your investment)

Annual Operating Expenses {- Multimedia Portfolio}	02.28 Select Portfolios: Group 1 Consumer Discretionary Sector Combo PRO-06 Multimedia Portfolio Multimedia Portfolio-Default
Management fee	0.55%
Distribution and/or Service (12b-1) fees	none
Other expenses	0.27%
Total annual operating expenses	0.82%

This example helps compare the cost of investing in the fund with the cost of investing in other funds.

Let's say, hypothetically, that the annual return for shares of the fund is 5% and that your shareholder fees and the annual operating expenses for shares of the fund are exactly as described in the fee table. This example illustrates the effect of fees and expenses, but is not meant to suggest actual or expected fees and expenses or returns, all of which may vary. For every $10,000 you invested, here's how much you would pay in total expenses if you sell all of your shares at the end of each time period indicated:

Sell All Shares

Expense Example {- Multimedia Portfolio}	02.28 Select Portfolios: Group 1 Consumer Discretionary Sector Combo PRO-06 Multimedia Portfolio Multimedia Portfolio-Default USD ($)
1 year	$ 84
3 years	262
5 years	455
10 years	$ 1,014

Portfolio Turnover

The fund pays transaction costs, such as commissions, when it buys and sells securities (or "turns over" its portfolio). A higher portfolio turnover rate may indicate higher transaction costs and may result in higher taxes when fund shares are held in a taxable account. These costs, which are not reflected in annual operating expenses or in the example, affect the fund's performance. During the most recent fiscal year, the fund's portfolio turnover rate was 33% of the average value of its portfolio.

Principal Investment Strategies

• Normally investing primarily in common stocks.

• Normally investing at least 80% of assets in securities of companies principally engaged in the development, production, sale, and distribution of goods or services used in the broadcast and media industries.

• Investing in domestic and foreign issuers.

• Using fundamental analysis of factors such as each issuer's financial condition and industry position, as well as market and economic conditions, to select investments.

Principal Investment Risks

• Stock Market Volatility. Stock markets are volatile and can decline significantly in response to adverse issuer, political, regulatory, market, or economic developments. Different parts of the market, including different market sectors, and different types of securities can react differently to these developments.

• Foreign Exposure. Foreign markets can be more volatile than the U.S. market due to increased risks of adverse issuer, political, regulatory, market, or economic developments and can perform differently from the U.S. market.

• Multimedia Industry Concentration. The multimedia industry can be significantly affected by the federal deregulation of cable and broadcasting, competition, technology, and government regulation.

• Issuer-Specific Changes. The value of an individual security or particular type of security can be more volatile than, and can perform differently from, the market as a whole. The value of securities of smaller issuers can be more volatile than that of larger issuers.

In addition, the fund is considered non-diversified and can invest a greater portion of assets in securities of a smaller number of individual issuers than a diversified fund. As a result, changes in the market value of a single investment could cause greater fluctuations in share price than would occur in a more diversified fund.

An investment in the fund is not a deposit of a bank and is not insured or guaranteed by the Federal Deposit Insurance Corporation or any other government agency. You could lose money by investing in the fund.

Performance

The following information is intended to help you understand the risks of investing in the fund. The information illustrates the changes in the performance of the fund's shares from year to year and compares the performance of the fund's shares to the performance of a securities market index and an additional index over various periods of time. The indexes have characteristics relevant to the fund's investment strategies. Index descriptions appear in the Additional Index Information section of the prospectus. Past performance (before and after taxes) is not an indication of future performance.

Visit www.fidelity.com for more recent performance information.

Year-by-Year Returns

Calendar Years

During the periods shown in the chart:	Returns	Quarter ended
Highest Quarter Return	26.72%	June 30, 2009
Lowest Quarter Return	-24.41%	December 31, 2008
Year-to-Date Return	10.76%	March 31, 2017

Average Annual Returns

After-tax returns are calculated using the historical highest individual federal marginal income tax rates, but do not reflect the impact of state or local taxes. Actual after-tax returns may differ depending on your individual circumstances. The after-tax returns shown are not relevant if you hold your shares in a retirement account or in another tax-deferred arrangement, such as an employee benefit plan (profit sharing, 401(k), or 403(b) plan).

For the periods ended December 31, 2016

Average Annual Total Returns{- Multimedia Portfolio} - 02.28 Select Portfolios: Group 1 Consumer Discretionary Sector Combo PRO-06 - Multimedia Portfolio	Past 1 year	Past 5 years	Past 10 years
Multimedia Portfolio-Default | Return Before Taxes	9.50%	17.79%	9.47%
Multimedia Portfolio-Default | After Taxes on Distributions	7.60%	16.29%	8.46%
Multimedia Portfolio-Default | After Taxes on Distributions and Sales	6.85%	14.34%	7.65%
S&P 500® Index(reflects no deduction for fees, expenses, or taxes)	11.96%	14.66%	6.95%
MSCI U.S. IMI Media 25-50 Index(reflects no deduction for fees, expenses, or taxes)	11.98%	19.75%	9.45%

XML

Label

Element

Value

Risk/Return:

rr_RiskReturnAbstract

Registrant Name

dei_EntityRegistrantName

FIDELITY SELECT PORTFOLIOS

Prospectus Date

rr_ProspectusDate

Apr. 29, 2017

02.28 Select Portfolios: Group 1 Consumer Discretionary Sector Combo PRO-06 | Multimedia Portfolio

Risk/Return:

rr_RiskReturnAbstract

Risk/Return [Heading]

rr_RiskReturnHeading

Fund Summary

Fund:
Multimedia Portfolio

Objective [Heading]

rr_ObjectiveHeading

Investment Objective

Objective, Primary [Text Block]

rr_ObjectivePrimaryTextBlock

The fund seeks capital appreciation.

Expense [Heading]

rr_ExpenseHeading

Fee Table

Expense Narrative [Text Block]

rr_ExpenseNarrativeTextBlock

The following table describes the fees and expenses that may be incurred when you buy and hold shares of the fund.

Shareholder Fees Caption [Text]

rr_ShareholderFeesCaption

Shareholder fees

(fees paid directly from your investment)

Operating Expenses Caption [Text]

rr_OperatingExpensesCaption

Annual Operating Expenses

(expenses that you pay each year as a % of the value of your investment)

Portfolio Turnover [Heading]

rr_PortfolioTurnoverHeading

Portfolio Turnover

Portfolio Turnover [Text Block]

rr_PortfolioTurnoverTextBlock

The fund pays transaction costs, such as commissions, when it buys and sells securities (or "turns over" its portfolio). A higher portfolio turnover rate may indicate higher transaction costs and may result in higher taxes when fund shares are held in a taxable account. These costs, which are not reflected in annual operating expenses or in the example, affect the fund's performance. During the most recent fiscal year, the fund's portfolio turnover rate was 33% of the average value of its portfolio.

Portfolio Turnover, Rate

rr_PortfolioTurnoverRate

33.00%

Expense Example Narrative [Text Block]

rr_ExpenseExampleNarrativeTextBlock

This example helps compare the cost of investing in the fund with the cost of investing in other funds.

Let's say, hypothetically, that the annual return for shares of the fund is 5% and that your shareholder fees and the annual operating expenses for shares of the fund are exactly as described in the fee table. This example illustrates the effect of fees and expenses, but is not meant to suggest actual or expected fees and expenses or returns, all of which may vary. For every $10,000 you invested, here's how much you would pay in total expenses if you sell all of your shares at the end of each time period indicated:

Expense Example by, Year, Caption [Text]

rr_ExpenseExampleByYearCaption

Sell All Shares

Strategy [Heading]

rr_StrategyHeading

Principal Investment Strategies

Strategy Narrative [Text Block]

rr_StrategyNarrativeTextBlock

• Normally investing primarily in common stocks.

• Normally investing at least 80% of assets in securities of companies principally engaged in the development, production, sale, and distribution of goods or services used in the broadcast and media industries.

• Investing in domestic and foreign issuers.

• Using fundamental analysis of factors such as each issuer's financial condition and industry position, as well as market and economic conditions, to select investments.

Strategy Portfolio Concentration [Text]

rr_StrategyPortfolioConcentration

Normally investing at least 80% of assets in securities of companies principally engaged in the development, production, sale, and distribution of goods or services used in the broadcast and media industries.

Risk [Heading]

rr_RiskHeading

Principal Investment Risks

Risk Narrative [Text Block]

rr_RiskNarrativeTextBlock

• Stock Market Volatility. Stock markets are volatile and can decline significantly in response to adverse issuer, political, regulatory, market, or economic developments. Different parts of the market, including different market sectors, and different types of securities can react differently to these developments.

• Foreign Exposure. Foreign markets can be more volatile than the U.S. market due to increased risks of adverse issuer, political, regulatory, market, or economic developments and can perform differently from the U.S. market.

• Multimedia Industry Concentration. The multimedia industry can be significantly affected by the federal deregulation of cable and broadcasting, competition, technology, and government regulation.

• Issuer-Specific Changes. The value of an individual security or particular type of security can be more volatile than, and can perform differently from, the market as a whole. The value of securities of smaller issuers can be more volatile than that of larger issuers.

In addition, the fund is considered non-diversified and can invest a greater portion of assets in securities of a smaller number of individual issuers than a diversified fund. As a result, changes in the market value of a single investment could cause greater fluctuations in share price than would occur in a more diversified fund.

An investment in the fund is not a deposit of a bank and is not insured or guaranteed by the Federal Deposit Insurance Corporation or any other government agency. You could lose money by investing in the fund.

Risk Lose Money [Text]

rr_RiskLoseMoney

You could lose money by investing in the fund.

Risk Nondiversified Status [Text]

rr_RiskNondiversifiedStatus

In addition, the fund is considered non-diversified and can invest a greater portion of assets in securities of a smaller number of individual issuers than a diversified fund. As a result, changes in the market value of a single investment could cause greater fluctuations in share price than would occur in a more diversified fund.

Risk Not Insured Depository Institution [Text]

rr_RiskNotInsuredDepositoryInstitution

An investment in the fund is not a deposit of a bank and is not insured or guaranteed by the Federal Deposit Insurance Corporation or any other government agency.

Bar Chart and Performance Table [Heading]

rr_BarChartAndPerformanceTableHeading

Performance

Performance Narrative [Text Block]

rr_PerformanceNarrativeTextBlock

The following information is intended to help you understand the risks of investing in the fund. The information illustrates the changes in the performance of the fund's shares from year to year and compares the performance of the fund's shares to the performance of a securities market index and an additional index over various periods of time. The indexes have characteristics relevant to the fund's investment strategies. Index descriptions appear in the Additional Index Information section of the prospectus. Past performance (before and after taxes) is not an indication of future performance.

Visit www.fidelity.com for more recent performance information.

Performance Information Illustrates Variability of Returns [Text]

rr_PerformanceInformationIllustratesVariabilityOfReturns

The information illustrates the changes in the performance of the fund's shares from year to year and compares the performance of the fund's shares to the performance of a securities market index and an additional index over various periods of time.

Performance Availability Website Address [Text]

rr_PerformanceAvailabilityWebSiteAddress

www.fidelity.com

Performance Past Does Not Indicate Future [Text]

rr_PerformancePastDoesNotIndicateFuture

Past performance (before and after taxes) is not an indication of future performance.

Bar Chart [Heading]

rr_BarChartHeading

Year-by-Year Returns

Calendar Years

Bar Chart Closing [Text Block]

rr_BarChartClosingTextBlock

During the periods shown in the chart:	Returns	Quarter ended
Highest Quarter Return	26.72%	June 30, 2009
Lowest Quarter Return	-24.41%	December 31, 2008
Year-to-Date Return	10.76%	March 31, 2017

Performance Table Heading

rr_PerformanceTableHeading

Average Annual Returns

Performance Table Uses Highest Federal Rate

rr_PerformanceTableUsesHighestFederalRate

After-tax returns are calculated using the historical highest individual federal marginal income tax rates, but do not reflect the impact of state or local taxes.

Performance Table Not Relevant to Tax Deferred

rr_PerformanceTableNotRelevantToTaxDeferred

The after-tax returns shown are not relevant if you hold your shares in a retirement account or in another tax-deferred arrangement, such as an employee benefit plan (profit sharing, 401(k), or 403(b) plan).

Performance Table Narrative

rr_PerformanceTableNarrativeTextBlock

After-tax returns are calculated using the historical highest individual federal marginal income tax rates, but do not reflect the impact of state or local taxes. Actual after-tax returns may differ depending on your individual circumstances. The after-tax returns shown are not relevant if you hold your shares in a retirement account or in another tax-deferred arrangement, such as an employee benefit plan (profit sharing, 401(k), or 403(b) plan).

For the periods ended December 31, 2016

02.28 Select Portfolios: Group 1 Consumer Discretionary Sector Combo PRO-06 | Multimedia Portfolio | Multimedia Portfolio-Default

Risk/Return:

rr_RiskReturnAbstract

Redemption fee on shares held less than 30 days (as a % of amount redeemed)

rr_RedemptionFeeOverRedemption

0.75%

Management fee

rr_ManagementFeesOverAssets

0.55%

Distribution and/or Service (12b-1) fees

rr_DistributionAndService12b1FeesOverAssets

none

Other expenses

rr_OtherExpensesOverAssets

0.27%

Total annual operating expenses

rr_ExpensesOverAssets

0.82%

1 year

rr_ExpenseExampleYear01

$ 84

3 years

rr_ExpenseExampleYear03

262

5 years

rr_ExpenseExampleYear05

455

10 years

rr_ExpenseExampleYear10

$ 1,014

2007

rr_AnnualReturn2007

(9.28%)

2008

rr_AnnualReturn2008

(39.29%)

2009

rr_AnnualReturn2009

54.41%

2010

rr_AnnualReturn2010

25.80%

2011

rr_AnnualReturn2011

1.83%

2012

rr_AnnualReturn2012

34.22%

2013

rr_AnnualReturn2013

45.65%

2014

rr_AnnualReturn2014

8.29%

2015

rr_AnnualReturn2015

(2.17%)

2016

rr_AnnualReturn2016

9.50%

Year to Date Return, Label

rr_YearToDateReturnLabel

Year-to-Date Return

Bar Chart, Year to Date Return, Date

rr_BarChartYearToDateReturnDate

Mar. 31, 2017

Bar Chart, Year to Date Return

rr_BarChartYearToDateReturn

10.76%

Highest Quarterly Return, Label

rr_HighestQuarterlyReturnLabel

Highest Quarter Return

Highest Quarterly Return, Date

rr_BarChartHighestQuarterlyReturnDate

Jun. 30, 2009

Highest Quarterly Return

rr_BarChartHighestQuarterlyReturn

26.72%

Lowest Quarterly Return, Label

rr_LowestQuarterlyReturnLabel

Lowest Quarter Return

Lowest Quarterly Return, Date

rr_BarChartLowestQuarterlyReturnDate

Dec. 31, 2008

Lowest Quarterly Return

rr_BarChartLowestQuarterlyReturn

(24.41%)

02.28 Select Portfolios: Group 1 Consumer Discretionary Sector Combo PRO-06 | Multimedia Portfolio | Return Before Taxes | Multimedia Portfolio-Default

Risk/Return:

rr_RiskReturnAbstract

Column

rr_AverageAnnualReturnColumnName

Multimedia Portfolio

Label

rr_AverageAnnualReturnLabel

Return Before Taxes

Past 1 year

rr_AverageAnnualReturnYear01

9.50%

Past 5 years

rr_AverageAnnualReturnYear05

17.79%

Past 10 years

rr_AverageAnnualReturnYear10

9.47%

02.28 Select Portfolios: Group 1 Consumer Discretionary Sector Combo PRO-06 | Multimedia Portfolio | After Taxes on Distributions | Multimedia Portfolio-Default

Risk/Return:

rr_RiskReturnAbstract

Column

rr_AverageAnnualReturnColumnName

Multimedia Portfolio

Label

rr_AverageAnnualReturnLabel

Return After Taxes on Distributions

Past 1 year

rr_AverageAnnualReturnYear01

7.60%

Past 5 years

rr_AverageAnnualReturnYear05

16.29%

Past 10 years

rr_AverageAnnualReturnYear10

8.46%

02.28 Select Portfolios: Group 1 Consumer Discretionary Sector Combo PRO-06 | Multimedia Portfolio | After Taxes on Distributions and Sales | Multimedia Portfolio-Default

Risk/Return:

rr_RiskReturnAbstract

Column

rr_AverageAnnualReturnColumnName

Multimedia Portfolio

Label

rr_AverageAnnualReturnLabel

Return After Taxes on Distributions and Sale of Fund Shares

Past 1 year

rr_AverageAnnualReturnYear01

6.85%

Past 5 years

rr_AverageAnnualReturnYear05

14.34%

Past 10 years

rr_AverageAnnualReturnYear10

7.65%

02.28 Select Portfolios: Group 1 Consumer Discretionary Sector Combo PRO-06 | Multimedia Portfolio | S&P 500® Index(reflects no deduction for fees, expenses, or taxes)

Risk/Return:

rr_RiskReturnAbstract

Past 1 year

rr_AverageAnnualReturnYear01

11.96%

Past 5 years

rr_AverageAnnualReturnYear05

14.66%

Past 10 years

rr_AverageAnnualReturnYear10

6.95%

02.28 Select Portfolios: Group 1 Consumer Discretionary Sector Combo PRO-06 | Multimedia Portfolio | MSCI U.S. IMI Media 25-50 Index(reflects no deduction for fees, expenses, or taxes)

Risk/Return:

rr_RiskReturnAbstract

Past 1 year

rr_AverageAnnualReturnYear01

11.98%

Past 5 years

rr_AverageAnnualReturnYear05

19.75%

Past 10 years

rr_AverageAnnualReturnYear10

9.45%

XML

02.28 Select Portfolios: Group 1 Consumer Discretionary Sector Combo PRO-06 | Retailing Portfolio

Fund Summary

Fund:
Retailing Portfolio

Investment Objective

The fund seeks capital appreciation.

Fee Table

The following table describes the fees and expenses that may be incurred when you buy and hold shares of the fund.

Shareholder fees

Shareholder Fees {- Retailing Portfolio}	02.28 Select Portfolios: Group 1 Consumer Discretionary Sector Combo PRO-06 Retailing Portfolio USD ($)
(fees paid directly from your investment)	none

Annual Operating Expenses

(expenses that you pay each year as a % of the value of your investment)

Annual Operating Expenses {- Retailing Portfolio}	02.28 Select Portfolios: Group 1 Consumer Discretionary Sector Combo PRO-06 Retailing Portfolio Retailing Portfolio-Default
Management fee	0.55%
Distribution and/or Service (12b-1) fees	none
Other expenses	0.23%
Total annual operating expenses	0.78%

This example helps compare the cost of investing in the fund with the cost of investing in other funds.

Let's say, hypothetically, that the annual return for shares of the fund is 5% and that your shareholder fees and the annual operating expenses for shares of the fund are exactly as described in the fee table. This example illustrates the effect of fees and expenses, but is not meant to suggest actual or expected fees and expenses or returns, all of which may vary. For every $10,000 you invested, here's how much you would pay in total expenses if you sell all of your shares at the end of each time period indicated:

Sell All Shares

Expense Example {- Retailing Portfolio}	02.28 Select Portfolios: Group 1 Consumer Discretionary Sector Combo PRO-06 Retailing Portfolio Retailing Portfolio-Default USD ($)
1 year	$ 80
3 years	249
5 years	433
10 years	$ 966

Portfolio Turnover

The fund pays transaction costs, such as commissions, when it buys and sells securities (or "turns over" its portfolio). A higher portfolio turnover rate may indicate higher transaction costs and may result in higher taxes when fund shares are held in a taxable account. These costs, which are not reflected in annual operating expenses or in the example, affect the fund's performance. During the most recent fiscal year, the fund's portfolio turnover rate was 17% of the average value of its portfolio.

Principal Investment Strategies

• Normally investing primarily in common stocks.

• Normally investing at least 80% of assets in securities of companies principally engaged in merchandising finished goods and services primarily to individual consumers.

• Investing in domestic and foreign issuers.

• Using fundamental analysis of factors such as each issuer's financial condition and industry position, as well as market and economic conditions, to select investments.

Principal Investment Risks

• Stock Market Volatility. Stock markets are volatile and can decline significantly in response to adverse issuer, political, regulatory, market, or economic developments. Different parts of the market, including different market sectors, and different types of securities can react differently to these developments.

• Foreign Exposure. Foreign markets can be more volatile than the U.S. market due to increased risks of adverse issuer, political, regulatory, market, or economic developments and can perform differently from the U.S. market.

• Retail Industry Concentration. The retail industry can be significantly affected by consumer confidence and spending, intense competition, and changing consumer tastes.

• Issuer-Specific Changes. The value of an individual security or particular type of security can be more volatile than, and can perform differently from, the market as a whole. The value of securities of smaller issuers can be more volatile than that of larger issuers.

In addition, the fund is considered non-diversified and can invest a greater portion of assets in securities of a smaller number of individual issuers than a diversified fund. As a result, changes in the market value of a single investment could cause greater fluctuations in share price than would occur in a more diversified fund.

An investment in the fund is not a deposit of a bank and is not insured or guaranteed by the Federal Deposit Insurance Corporation or any other government agency. You could lose money by investing in the fund.

Performance

The following information is intended to help you understand the risks of investing in the fund. The information illustrates the changes in the performance of the fund's shares from year to year and compares the performance of the fund's shares to the performance of a securities market index and an additional index over various periods of time. The indexes have characteristics relevant to the fund's investment strategies. Index descriptions appear in the Additional Index Information section of the prospectus. Past performance (before and after taxes) is not an indication of future performance.

Visit www.fidelity.com for more recent performance information.

Year-by-Year Returns

Calendar Years

During the periods shown in the chart:	Returns	Quarter ended
Highest Quarter Return	20.23%	March 31, 2012
Lowest Quarter Return	-19.86%	December 31, 2008
Year-to-Date Return	7.21%	March 31, 2017

Average Annual Returns

After-tax returns are calculated using the historical highest individual federal marginal income tax rates, but do not reflect the impact of state or local taxes. Actual after-tax returns may differ depending on your individual circumstances. The after-tax returns shown are not relevant if you hold your shares in a retirement account or in another tax-deferred arrangement, such as an employee benefit plan (profit sharing, 401(k), or 403(b) plan).

For the periods ended December 31, 2016

Average Annual Total Returns{- Retailing Portfolio} - 02.28 Select Portfolios: Group 1 Consumer Discretionary Sector Combo PRO-06 - Retailing Portfolio	Past 1 year	Past 5 years	Past 10 years
Retailing Portfolio-Default | Return Before Taxes	4.43%	20.01%	12.92%
Retailing Portfolio-Default | After Taxes on Distributions	4.40%	19.12%	11.84%
Retailing Portfolio-Default | After Taxes on Distributions and Sales	2.54%	16.11%	10.41%
S&P 500® Index(reflects no deduction for fees, expenses, or taxes)	11.96%	14.66%	6.95%
MSCI U.S. IMI Retailing 25-50 Index(reflects no deduction for fees, expenses, or taxes)	5.30%	19.97%	11.38%

XML

Label

Element

Value

Risk/Return:

rr_RiskReturnAbstract

Registrant Name

dei_EntityRegistrantName

FIDELITY SELECT PORTFOLIOS

Prospectus Date

rr_ProspectusDate

Apr. 29, 2017

02.28 Select Portfolios: Group 1 Consumer Discretionary Sector Combo PRO-06 | Retailing Portfolio

Risk/Return:

rr_RiskReturnAbstract

Risk/Return [Heading]

rr_RiskReturnHeading

Fund Summary

Fund:
Retailing Portfolio

Objective [Heading]

rr_ObjectiveHeading

Investment Objective

Objective, Primary [Text Block]

rr_ObjectivePrimaryTextBlock

The fund seeks capital appreciation.

Expense [Heading]

rr_ExpenseHeading

Fee Table

Expense Narrative [Text Block]

rr_ExpenseNarrativeTextBlock

The following table describes the fees and expenses that may be incurred when you buy and hold shares of the fund.

Shareholder Fees Caption [Text]

rr_ShareholderFeesCaption

Shareholder fees

(fees paid directly from your investment)

rr_ShareholderFeeOther

none

Operating Expenses Caption [Text]

rr_OperatingExpensesCaption

Annual Operating Expenses

(expenses that you pay each year as a % of the value of your investment)

Portfolio Turnover [Heading]

rr_PortfolioTurnoverHeading

Portfolio Turnover

Portfolio Turnover [Text Block]

rr_PortfolioTurnoverTextBlock

The fund pays transaction costs, such as commissions, when it buys and sells securities (or "turns over" its portfolio). A higher portfolio turnover rate may indicate higher transaction costs and may result in higher taxes when fund shares are held in a taxable account. These costs, which are not reflected in annual operating expenses or in the example, affect the fund's performance. During the most recent fiscal year, the fund's portfolio turnover rate was 17% of the average value of its portfolio.

Portfolio Turnover, Rate

rr_PortfolioTurnoverRate

17.00%

Expense Example Narrative [Text Block]

rr_ExpenseExampleNarrativeTextBlock

This example helps compare the cost of investing in the fund with the cost of investing in other funds.

Let's say, hypothetically, that the annual return for shares of the fund is 5% and that your shareholder fees and the annual operating expenses for shares of the fund are exactly as described in the fee table. This example illustrates the effect of fees and expenses, but is not meant to suggest actual or expected fees and expenses or returns, all of which may vary. For every $10,000 you invested, here's how much you would pay in total expenses if you sell all of your shares at the end of each time period indicated:

Expense Example by, Year, Caption [Text]

rr_ExpenseExampleByYearCaption

Sell All Shares

Strategy [Heading]

rr_StrategyHeading

Principal Investment Strategies

Strategy Narrative [Text Block]

rr_StrategyNarrativeTextBlock

• Normally investing primarily in common stocks.

• Normally investing at least 80% of assets in securities of companies principally engaged in merchandising finished goods and services primarily to individual consumers.

• Investing in domestic and foreign issuers.

• Using fundamental analysis of factors such as each issuer's financial condition and industry position, as well as market and economic conditions, to select investments.

Strategy Portfolio Concentration [Text]

rr_StrategyPortfolioConcentration

Normally investing at least 80% of assets in securities of companies principally engaged in merchandising finished goods and services primarily to individual consumers.

Risk [Heading]

rr_RiskHeading

Principal Investment Risks

Risk Narrative [Text Block]

rr_RiskNarrativeTextBlock

• Stock Market Volatility. Stock markets are volatile and can decline significantly in response to adverse issuer, political, regulatory, market, or economic developments. Different parts of the market, including different market sectors, and different types of securities can react differently to these developments.

• Foreign Exposure. Foreign markets can be more volatile than the U.S. market due to increased risks of adverse issuer, political, regulatory, market, or economic developments and can perform differently from the U.S. market.

• Retail Industry Concentration. The retail industry can be significantly affected by consumer confidence and spending, intense competition, and changing consumer tastes.

• Issuer-Specific Changes. The value of an individual security or particular type of security can be more volatile than, and can perform differently from, the market as a whole. The value of securities of smaller issuers can be more volatile than that of larger issuers.

In addition, the fund is considered non-diversified and can invest a greater portion of assets in securities of a smaller number of individual issuers than a diversified fund. As a result, changes in the market value of a single investment could cause greater fluctuations in share price than would occur in a more diversified fund.

An investment in the fund is not a deposit of a bank and is not insured or guaranteed by the Federal Deposit Insurance Corporation or any other government agency. You could lose money by investing in the fund.

Risk Lose Money [Text]

rr_RiskLoseMoney

You could lose money by investing in the fund.

Risk Nondiversified Status [Text]

rr_RiskNondiversifiedStatus

In addition, the fund is considered non-diversified and can invest a greater portion of assets in securities of a smaller number of individual issuers than a diversified fund. As a result, changes in the market value of a single investment could cause greater fluctuations in share price than would occur in a more diversified fund.

Risk Not Insured Depository Institution [Text]

rr_RiskNotInsuredDepositoryInstitution

An investment in the fund is not a deposit of a bank and is not insured or guaranteed by the Federal Deposit Insurance Corporation or any other government agency.

Bar Chart and Performance Table [Heading]

rr_BarChartAndPerformanceTableHeading

Performance

Performance Narrative [Text Block]

rr_PerformanceNarrativeTextBlock

The following information is intended to help you understand the risks of investing in the fund. The information illustrates the changes in the performance of the fund's shares from year to year and compares the performance of the fund's shares to the performance of a securities market index and an additional index over various periods of time. The indexes have characteristics relevant to the fund's investment strategies. Index descriptions appear in the Additional Index Information section of the prospectus. Past performance (before and after taxes) is not an indication of future performance.

Visit www.fidelity.com for more recent performance information.

Performance Information Illustrates Variability of Returns [Text]

rr_PerformanceInformationIllustratesVariabilityOfReturns

The information illustrates the changes in the performance of the fund's shares from year to year and compares the performance of the fund's shares to the performance of a securities market index and an additional index over various periods of time.

Performance Availability Website Address [Text]

rr_PerformanceAvailabilityWebSiteAddress

www.fidelity.com

Performance Past Does Not Indicate Future [Text]

rr_PerformancePastDoesNotIndicateFuture

Past performance (before and after taxes) is not an indication of future performance.

Bar Chart [Heading]

rr_BarChartHeading

Year-by-Year Returns

Calendar Years

Bar Chart Closing [Text Block]

rr_BarChartClosingTextBlock

During the periods shown in the chart:	Returns	Quarter ended
Highest Quarter Return	20.23%	March 31, 2012
Lowest Quarter Return	-19.86%	December 31, 2008
Year-to-Date Return	7.21%	March 31, 2017

Performance Table Heading

rr_PerformanceTableHeading

Average Annual Returns

Performance Table Uses Highest Federal Rate

rr_PerformanceTableUsesHighestFederalRate

After-tax returns are calculated using the historical highest individual federal marginal income tax rates, but do not reflect the impact of state or local taxes.

Performance Table Not Relevant to Tax Deferred

rr_PerformanceTableNotRelevantToTaxDeferred

The after-tax returns shown are not relevant if you hold your shares in a retirement account or in another tax-deferred arrangement, such as an employee benefit plan (profit sharing, 401(k), or 403(b) plan).

Performance Table Narrative

rr_PerformanceTableNarrativeTextBlock

After-tax returns are calculated using the historical highest individual federal marginal income tax rates, but do not reflect the impact of state or local taxes. Actual after-tax returns may differ depending on your individual circumstances. The after-tax returns shown are not relevant if you hold your shares in a retirement account or in another tax-deferred arrangement, such as an employee benefit plan (profit sharing, 401(k), or 403(b) plan).

For the periods ended December 31, 2016

02.28 Select Portfolios: Group 1 Consumer Discretionary Sector Combo PRO-06 | Retailing Portfolio | Retailing Portfolio-Default

Risk/Return:

rr_RiskReturnAbstract

Management fee

rr_ManagementFeesOverAssets

0.55%

Distribution and/or Service (12b-1) fees

rr_DistributionAndService12b1FeesOverAssets

none

Other expenses

rr_OtherExpensesOverAssets

0.23%

Total annual operating expenses

rr_ExpensesOverAssets

0.78%

1 year

rr_ExpenseExampleYear01

$ 80

3 years

rr_ExpenseExampleYear03

249

5 years

rr_ExpenseExampleYear05

433

10 years

rr_ExpenseExampleYear10

$ 966

2007

rr_AnnualReturn2007

(7.97%)

2008

rr_AnnualReturn2008

(29.58%)

2009

rr_AnnualReturn2009

57.82%

2010

rr_AnnualReturn2010

28.06%

2011

rr_AnnualReturn2011

3.36%

2012

rr_AnnualReturn2012

24.83%

2013

rr_AnnualReturn2013

43.93%

2014

rr_AnnualReturn2014

12.02%

2015

rr_AnnualReturn2015

18.41%

2016

rr_AnnualReturn2016

4.43%

Year to Date Return, Label

rr_YearToDateReturnLabel

Year-to-Date Return

Bar Chart, Year to Date Return, Date

rr_BarChartYearToDateReturnDate

Mar. 31, 2017

Bar Chart, Year to Date Return

rr_BarChartYearToDateReturn

7.21%

Highest Quarterly Return, Label

rr_HighestQuarterlyReturnLabel

Highest Quarter Return

Highest Quarterly Return, Date

rr_BarChartHighestQuarterlyReturnDate

Mar. 31, 2012

Highest Quarterly Return

rr_BarChartHighestQuarterlyReturn

20.23%

Lowest Quarterly Return, Label

rr_LowestQuarterlyReturnLabel

Lowest Quarter Return

Lowest Quarterly Return, Date

rr_BarChartLowestQuarterlyReturnDate

Dec. 31, 2008

Lowest Quarterly Return

rr_BarChartLowestQuarterlyReturn

(19.86%)

02.28 Select Portfolios: Group 1 Consumer Discretionary Sector Combo PRO-06 | Retailing Portfolio | Return Before Taxes | Retailing Portfolio-Default

Risk/Return:

rr_RiskReturnAbstract

Column

rr_AverageAnnualReturnColumnName

Retailing Portfolio

Label

rr_AverageAnnualReturnLabel

Return Before Taxes

Past 1 year

rr_AverageAnnualReturnYear01

4.43%

Past 5 years

rr_AverageAnnualReturnYear05

20.01%

Past 10 years

rr_AverageAnnualReturnYear10

12.92%

02.28 Select Portfolios: Group 1 Consumer Discretionary Sector Combo PRO-06 | Retailing Portfolio | After Taxes on Distributions | Retailing Portfolio-Default

Risk/Return:

rr_RiskReturnAbstract

Column

rr_AverageAnnualReturnColumnName

Retailing Portfolio

Label

rr_AverageAnnualReturnLabel

Return After Taxes on Distributions

Past 1 year

rr_AverageAnnualReturnYear01

4.40%

Past 5 years

rr_AverageAnnualReturnYear05

19.12%

Past 10 years

rr_AverageAnnualReturnYear10

11.84%

02.28 Select Portfolios: Group 1 Consumer Discretionary Sector Combo PRO-06 | Retailing Portfolio | After Taxes on Distributions and Sales | Retailing Portfolio-Default

Risk/Return:

rr_RiskReturnAbstract

Column

rr_AverageAnnualReturnColumnName

Retailing Portfolio

Label

rr_AverageAnnualReturnLabel

Return After Taxes on Distributions and Sale of Fund Shares

Past 1 year

rr_AverageAnnualReturnYear01

2.54%

Past 5 years

rr_AverageAnnualReturnYear05

16.11%

Past 10 years

rr_AverageAnnualReturnYear10

10.41%

02.28 Select Portfolios: Group 1 Consumer Discretionary Sector Combo PRO-06 | Retailing Portfolio | S&P 500® Index(reflects no deduction for fees, expenses, or taxes)

Risk/Return:

rr_RiskReturnAbstract

Past 1 year

rr_AverageAnnualReturnYear01

11.96%

Past 5 years

rr_AverageAnnualReturnYear05

14.66%

Past 10 years

rr_AverageAnnualReturnYear10

6.95%

02.28 Select Portfolios: Group 1 Consumer Discretionary Sector Combo PRO-06 | Retailing Portfolio | MSCI U.S. IMI Retailing 25-50 Index(reflects no deduction for fees, expenses, or taxes)

Risk/Return:

rr_RiskReturnAbstract

Past 1 year

rr_AverageAnnualReturnYear01

5.30%

Past 5 years

rr_AverageAnnualReturnYear05

19.97%

Past 10 years

rr_AverageAnnualReturnYear10

11.38%

XML

02.28 Select Portfolios: Group 9 Telecommunications Services Sector Retail Combo PRO-08 | Telecommunications Portfolio

Fund Summary

Fund/Class:
Telecommunications Portfolio/Telecommunications Portfolio

Investment Objective

The fund seeks capital appreciation.

Fee Table

The following table describes the fees and expenses that may be incurred when you buy and hold shares of the fund.

Shareholder fees

Shareholder Fees {- Telecommunications Portfolio}	02.28 Select Portfolios: Group 9 Telecommunications Services Sector Retail Combo PRO-08 Telecommunications Portfolio USD ($)
(fees paid directly from your investment)	none

Annual Operating Expenses

(expenses that you pay each year as a % of the value of your investment)

Annual Operating Expenses {- Telecommunications Portfolio}	02.28 Select Portfolios: Group 9 Telecommunications Services Sector Retail Combo PRO-08 Telecommunications Portfolio Telecommunications Portfolio-Retail Class
Management fee	0.55%
Distribution and/or Service (12b-1) fees	none
Other expenses	0.25%
Total annual operating expenses	0.80%

This example helps compare the cost of investing in the fund with the cost of investing in other funds.

Let's say, hypothetically, that the annual return for shares of the fund is 5% and that your shareholder fees and the annual operating expenses for shares of the fund are exactly as described in the fee table. This example illustrates the effect of fees and expenses, but is not meant to suggest actual or expected fees and expenses or returns, all of which may vary. For every $10,000 you invested, here's how much you would pay in total expenses if you sell all of your shares at the end of each time period indicated:

Sell All Shares

Expense Example {- Telecommunications Portfolio}	02.28 Select Portfolios: Group 9 Telecommunications Services Sector Retail Combo PRO-08 Telecommunications Portfolio Telecommunications Portfolio-Retail Class USD ($)
1 year	$ 82
3 years	255
5 years	444
10 years	$ 990

Portfolio Turnover

The fund pays transaction costs, such as commissions, when it buys and sells securities (or "turns over" its portfolio). A higher portfolio turnover rate may indicate higher transaction costs and may result in higher taxes when fund shares are held in a taxable account. These costs, which are not reflected in annual operating expenses or in the example, affect the fund's performance. During the most recent fiscal year, the fund's portfolio turnover rate was 105% of the average value of its portfolio.

Principal Investment Strategies

• Normally investing primarily in common stocks.

• Normally investing at least 80% of assets in securities of companies principally engaged in the development, manufacture, or sale of communications services or communications equipment.

• Investing in domestic and foreign issuers.

• Using fundamental analysis of factors such as each issuer's financial condition and industry position, as well as market and economic conditions, to select investments.

Principal Investment Risks

• Stock Market Volatility. Stock markets are volatile and can decline significantly in response to adverse issuer, political, regulatory, market, or economic developments. Different parts of the market, including different market sectors, and different types of securities can react differently to these developments.

• Foreign Exposure. Foreign markets can be more volatile than the U.S. market due to increased risks of adverse issuer, political, regulatory, market, or economic developments and can perform differently from the U.S. market.

• Telecom Services Industry Concentration. The telecom services industry is subject to government regulation and can be significantly affected by intense competition and technology changes.

• Issuer-Specific Changes. The value of an individual security or particular type of security can be more volatile than, and can perform differently from, the market as a whole. The value of securities of smaller issuers can be more volatile than that of larger issuers.

In addition, the fund is considered non-diversified and can invest a greater portion of assets in securities of a smaller number of individual issuers than a diversified fund. As a result, changes in the market value of a single investment could cause greater fluctuations in share price than would occur in a more diversified fund.

An investment in the fund is not a deposit of a bank and is not insured or guaranteed by the Federal Deposit Insurance Corporation or any other government agency. You could lose money by investing in the fund.

Performance

The following information is intended to help you understand the risks of investing in the fund. The information illustrates the changes in the performance of the fund's shares from year to year and compares the performance of the fund's shares to the performance of a securities market index and an additional index over various periods of time. The indexes have characteristics relevant to the fund's investment strategies. Index descriptions appear in the Additional Index Information section of the prospectus. Past performance (before and after taxes) is not an indication of future performance.

Visit www.fidelity.com for more recent performance information.

Year-by-Year Returns

Calendar Years

During the periods shown in the chart:	Returns	Quarter ended
Highest Quarter Return	18.66%	June 30, 2009
Lowest Quarter Return	-21.99%	December 31, 2008
Year-to-Date Return	0.11%	March 31, 2017

Average Annual Returns

After-tax returns are calculated using the historical highest individual federal marginal income tax rates, but do not reflect the impact of state or local taxes. Actual after-tax returns may differ depending on your individual circumstances. The after-tax returns shown are not relevant if you hold your shares in a retirement account or in another tax-deferred arrangement, such as an employee benefit plan (profit sharing, 401(k), or 403(b) plan).

For the periods ended December 31, 2016

Average Annual Total Returns{- Telecommunications Portfolio} - 02.28 Select Portfolios: Group 9 Telecommunications Services Sector Retail Combo PRO-08 - Telecommunications Portfolio	Past 1 year	Past 5 years	Past 10 years
Telecommunications Portfolio-Retail Class | Return Before Taxes	22.81%	13.42%	6.21%
Telecommunications Portfolio-Retail Class | After Taxes on Distributions	20.47%	12.49%	5.65%
Telecommunications Portfolio-Retail Class | After Taxes on Distributions and Sales	13.79%	10.58%	4.90%
S&P 500® Index(reflects no deduction for fees, expenses, or taxes)	11.96%	14.66%	6.95%
MSCI U.S. IMI Telecommunications Services 25-50 Index(reflects no deduction for fees, expenses, or taxes)	22.45%	13.65%	6.30%

XML

Label

Element

Value

Risk/Return:

rr_RiskReturnAbstract

Registrant Name

dei_EntityRegistrantName

FIDELITY SELECT PORTFOLIOS

Prospectus Date

rr_ProspectusDate

Apr. 29, 2017

02.28 Select Portfolios: Group 9 Telecommunications Services Sector Retail Combo PRO-08 | Telecommunications Portfolio

Risk/Return:

rr_RiskReturnAbstract

Risk/Return [Heading]

rr_RiskReturnHeading

Fund Summary

Fund/Class:
Telecommunications Portfolio/Telecommunications Portfolio

Objective [Heading]

rr_ObjectiveHeading

Investment Objective

Objective, Primary [Text Block]

rr_ObjectivePrimaryTextBlock

The fund seeks capital appreciation.

Expense [Heading]

rr_ExpenseHeading

Fee Table

Expense Narrative [Text Block]

rr_ExpenseNarrativeTextBlock

The following table describes the fees and expenses that may be incurred when you buy and hold shares of the fund.

Shareholder Fees Caption [Text]

rr_ShareholderFeesCaption

Shareholder fees

(fees paid directly from your investment)

rr_ShareholderFeeOther

none

Operating Expenses Caption [Text]

rr_OperatingExpensesCaption

Annual Operating Expenses

(expenses that you pay each year as a % of the value of your investment)

Portfolio Turnover [Heading]

rr_PortfolioTurnoverHeading

Portfolio Turnover

Portfolio Turnover [Text Block]

rr_PortfolioTurnoverTextBlock

The fund pays transaction costs, such as commissions, when it buys and sells securities (or "turns over" its portfolio). A higher portfolio turnover rate may indicate higher transaction costs and may result in higher taxes when fund shares are held in a taxable account. These costs, which are not reflected in annual operating expenses or in the example, affect the fund's performance. During the most recent fiscal year, the fund's portfolio turnover rate was 105% of the average value of its portfolio.

Portfolio Turnover, Rate

rr_PortfolioTurnoverRate

105.00%

Expense Example Narrative [Text Block]

rr_ExpenseExampleNarrativeTextBlock

This example helps compare the cost of investing in the fund with the cost of investing in other funds.

Let's say, hypothetically, that the annual return for shares of the fund is 5% and that your shareholder fees and the annual operating expenses for shares of the fund are exactly as described in the fee table. This example illustrates the effect of fees and expenses, but is not meant to suggest actual or expected fees and expenses or returns, all of which may vary. For every $10,000 you invested, here's how much you would pay in total expenses if you sell all of your shares at the end of each time period indicated:

Expense Example by, Year, Caption [Text]

rr_ExpenseExampleByYearCaption

Sell All Shares

Strategy [Heading]

rr_StrategyHeading

Principal Investment Strategies

Strategy Narrative [Text Block]

rr_StrategyNarrativeTextBlock

• Normally investing primarily in common stocks.

• Normally investing at least 80% of assets in securities of companies principally engaged in the development, manufacture, or sale of communications services or communications equipment.

• Investing in domestic and foreign issuers.

• Using fundamental analysis of factors such as each issuer's financial condition and industry position, as well as market and economic conditions, to select investments.

Strategy Portfolio Concentration [Text]

rr_StrategyPortfolioConcentration

Normally investing at least 80% of assets in securities of companies principally engaged in the development, manufacture, or sale of communications services or communications equipment.

Risk [Heading]

rr_RiskHeading

Principal Investment Risks

Risk Narrative [Text Block]

rr_RiskNarrativeTextBlock

• Stock Market Volatility. Stock markets are volatile and can decline significantly in response to adverse issuer, political, regulatory, market, or economic developments. Different parts of the market, including different market sectors, and different types of securities can react differently to these developments.

• Foreign Exposure. Foreign markets can be more volatile than the U.S. market due to increased risks of adverse issuer, political, regulatory, market, or economic developments and can perform differently from the U.S. market.

• Telecom Services Industry Concentration. The telecom services industry is subject to government regulation and can be significantly affected by intense competition and technology changes.

• Issuer-Specific Changes. The value of an individual security or particular type of security can be more volatile than, and can perform differently from, the market as a whole. The value of securities of smaller issuers can be more volatile than that of larger issuers.

In addition, the fund is considered non-diversified and can invest a greater portion of assets in securities of a smaller number of individual issuers than a diversified fund. As a result, changes in the market value of a single investment could cause greater fluctuations in share price than would occur in a more diversified fund.

An investment in the fund is not a deposit of a bank and is not insured or guaranteed by the Federal Deposit Insurance Corporation or any other government agency. You could lose money by investing in the fund.

Risk Lose Money [Text]

rr_RiskLoseMoney

You could lose money by investing in the fund.

Risk Nondiversified Status [Text]

rr_RiskNondiversifiedStatus

In addition, the fund is considered non-diversified and can invest a greater portion of assets in securities of a smaller number of individual issuers than a diversified fund. As a result, changes in the market value of a single investment could cause greater fluctuations in share price than would occur in a more diversified fund.

Risk Not Insured Depository Institution [Text]

rr_RiskNotInsuredDepositoryInstitution

An investment in the fund is not a deposit of a bank and is not insured or guaranteed by the Federal Deposit Insurance Corporation or any other government agency.

Bar Chart and Performance Table [Heading]

rr_BarChartAndPerformanceTableHeading

Performance

Performance Narrative [Text Block]

rr_PerformanceNarrativeTextBlock

The following information is intended to help you understand the risks of investing in the fund. The information illustrates the changes in the performance of the fund's shares from year to year and compares the performance of the fund's shares to the performance of a securities market index and an additional index over various periods of time. The indexes have characteristics relevant to the fund's investment strategies. Index descriptions appear in the Additional Index Information section of the prospectus. Past performance (before and after taxes) is not an indication of future performance.

Visit www.fidelity.com for more recent performance information.

Performance Information Illustrates Variability of Returns [Text]

rr_PerformanceInformationIllustratesVariabilityOfReturns

The information illustrates the changes in the performance of the fund's shares from year to year and compares the performance of the fund's shares to the performance of a securities market index and an additional index over various periods of time.

Performance Availability Website Address [Text]

rr_PerformanceAvailabilityWebSiteAddress

www.fidelity.com

Performance Past Does Not Indicate Future [Text]

rr_PerformancePastDoesNotIndicateFuture

Past performance (before and after taxes) is not an indication of future performance.

Bar Chart [Heading]

rr_BarChartHeading

Year-by-Year Returns

Calendar Years

Bar Chart Closing [Text Block]

rr_BarChartClosingTextBlock

During the periods shown in the chart:	Returns	Quarter ended
Highest Quarter Return	18.66%	June 30, 2009
Lowest Quarter Return	-21.99%	December 31, 2008
Year-to-Date Return	0.11%	March 31, 2017

Performance Table Heading

rr_PerformanceTableHeading

Average Annual Returns

Performance Table Uses Highest Federal Rate

rr_PerformanceTableUsesHighestFederalRate

After-tax returns are calculated using the historical highest individual federal marginal income tax rates, but do not reflect the impact of state or local taxes.

Performance Table Not Relevant to Tax Deferred

rr_PerformanceTableNotRelevantToTaxDeferred

The after-tax returns shown are not relevant if you hold your shares in a retirement account or in another tax-deferred arrangement, such as an employee benefit plan (profit sharing, 401(k), or 403(b) plan).

Performance Table Narrative

rr_PerformanceTableNarrativeTextBlock

After-tax returns are calculated using the historical highest individual federal marginal income tax rates, but do not reflect the impact of state or local taxes. Actual after-tax returns may differ depending on your individual circumstances. The after-tax returns shown are not relevant if you hold your shares in a retirement account or in another tax-deferred arrangement, such as an employee benefit plan (profit sharing, 401(k), or 403(b) plan).

For the periods ended December 31, 2016

02.28 Select Portfolios: Group 9 Telecommunications Services Sector Retail Combo PRO-08 | Telecommunications Portfolio | Telecommunications Portfolio-Retail Class

Risk/Return:

rr_RiskReturnAbstract

Management fee

rr_ManagementFeesOverAssets

0.55%

Distribution and/or Service (12b-1) fees

rr_DistributionAndService12b1FeesOverAssets

none

Other expenses

rr_OtherExpensesOverAssets

0.25%

Total annual operating expenses

rr_ExpensesOverAssets

0.80%

1 year

rr_ExpenseExampleYear01

$ 82

3 years

rr_ExpenseExampleYear03

255

5 years

rr_ExpenseExampleYear05

444

10 years

rr_ExpenseExampleYear10

$ 990

2007

rr_AnnualReturn2007

8.20%

2008

rr_AnnualReturn2008

(47.64%)

2009

rr_AnnualReturn2009

51.56%

2010

rr_AnnualReturn2010

18.32%

2011

rr_AnnualReturn2011

(4.24%)

2012

rr_AnnualReturn2012

18.64%

2013

rr_AnnualReturn2013

21.52%

2014

rr_AnnualReturn2014

3.61%

2015

rr_AnnualReturn2015

2.31%

2016

rr_AnnualReturn2016

22.81%

Year to Date Return, Label

rr_YearToDateReturnLabel

Year-to-Date Return

Bar Chart, Year to Date Return, Date

rr_BarChartYearToDateReturnDate

Mar. 31, 2017

Bar Chart, Year to Date Return

rr_BarChartYearToDateReturn

0.11%

Highest Quarterly Return, Label

rr_HighestQuarterlyReturnLabel

Highest Quarter Return

Highest Quarterly Return, Date

rr_BarChartHighestQuarterlyReturnDate

Jun. 30, 2009

Highest Quarterly Return

rr_BarChartHighestQuarterlyReturn

18.66%

Lowest Quarterly Return, Label

rr_LowestQuarterlyReturnLabel

Lowest Quarter Return

Lowest Quarterly Return, Date

rr_BarChartLowestQuarterlyReturnDate

Dec. 31, 2008

Lowest Quarterly Return

rr_BarChartLowestQuarterlyReturn

(21.99%)

02.28 Select Portfolios: Group 9 Telecommunications Services Sector Retail Combo PRO-08 | Telecommunications Portfolio | Return Before Taxes | Telecommunications Portfolio-Retail Class

Risk/Return:

rr_RiskReturnAbstract

Column

rr_AverageAnnualReturnColumnName

Telecommunications Portfolio

Label

rr_AverageAnnualReturnLabel

Return Before Taxes

Past 1 year

rr_AverageAnnualReturnYear01

22.81%

Past 5 years

rr_AverageAnnualReturnYear05

13.42%

Past 10 years

rr_AverageAnnualReturnYear10

6.21%

02.28 Select Portfolios: Group 9 Telecommunications Services Sector Retail Combo PRO-08 | Telecommunications Portfolio | After Taxes on Distributions | Telecommunications Portfolio-Retail Class

Risk/Return:

rr_RiskReturnAbstract

Column

rr_AverageAnnualReturnColumnName

Telecommunications Portfolio

Label

rr_AverageAnnualReturnLabel

Return After Taxes on Distributions

Past 1 year

rr_AverageAnnualReturnYear01

20.47%

Past 5 years

rr_AverageAnnualReturnYear05

12.49%

Past 10 years

rr_AverageAnnualReturnYear10

5.65%

02.28 Select Portfolios: Group 9 Telecommunications Services Sector Retail Combo PRO-08 | Telecommunications Portfolio | After Taxes on Distributions and Sales | Telecommunications Portfolio-Retail Class

Risk/Return:

rr_RiskReturnAbstract

Column

rr_AverageAnnualReturnColumnName

Telecommunications Portfolio

Label

rr_AverageAnnualReturnLabel

Return After Taxes on Distributions and Sale of Fund Shares

Past 1 year

rr_AverageAnnualReturnYear01

13.79%

Past 5 years

rr_AverageAnnualReturnYear05

10.58%

Past 10 years

rr_AverageAnnualReturnYear10

4.90%

02.28 Select Portfolios: Group 9 Telecommunications Services Sector Retail Combo PRO-08 | Telecommunications Portfolio | S&P 500® Index(reflects no deduction for fees, expenses, or taxes)

Risk/Return:

rr_RiskReturnAbstract

Past 1 year

rr_AverageAnnualReturnYear01

11.96%

Past 5 years

rr_AverageAnnualReturnYear05

14.66%

Past 10 years

rr_AverageAnnualReturnYear10

6.95%

02.28 Select Portfolios: Group 9 Telecommunications Services Sector Retail Combo PRO-08 | Telecommunications Portfolio | MSCI U.S. IMI Telecommunications Services 25-50 Index(reflects no deduction for fees, expenses, or taxes)

Risk/Return:

rr_RiskReturnAbstract

Past 1 year

rr_AverageAnnualReturnYear01

22.45%

Past 5 years

rr_AverageAnnualReturnYear05

13.65%

Past 10 years

rr_AverageAnnualReturnYear10

6.30%

XML

02.28 Select Portfolios: Group 9 Telecommunications Services Sector Retail Combo PRO-08 | Wireless Portfolio

Fund Summary

Fund:
Wireless Portfolio

Investment Objective

The fund seeks capital appreciation.

Fee Table

The following table describes the fees and expenses that may be incurred when you buy and hold shares of the fund.

Shareholder fees

(fees paid directly from your investment)

Shareholder Fees {- Wireless Portfolio}	02.28 Select Portfolios: Group 9 Telecommunications Services Sector Retail Combo PRO-08 Wireless Portfolio Wireless Portfolio-Default
Redemption fee on shares held less than 30 days (as a % of amount redeemed)	0.75%

Annual Operating Expenses

(expenses that you pay each year as a % of the value of your investment)

Annual Operating Expenses {- Wireless Portfolio}	02.28 Select Portfolios: Group 9 Telecommunications Services Sector Retail Combo PRO-08 Wireless Portfolio Wireless Portfolio-Default
Management fee	0.55%
Distribution and/or Service (12b-1) fees	none
Other expenses	0.32%
Total annual operating expenses	0.87%

This example helps compare the cost of investing in the fund with the cost of investing in other funds.

Let's say, hypothetically, that the annual return for shares of the fund is 5% and that your shareholder fees and the annual operating expenses for shares of the fund are exactly as described in the fee table. This example illustrates the effect of fees and expenses, but is not meant to suggest actual or expected fees and expenses or returns, all of which may vary. For every $10,000 you invested, here's how much you would pay in total expenses if you sell all of your shares at the end of each time period indicated:

Sell All Shares

Expense Example {- Wireless Portfolio}	02.28 Select Portfolios: Group 9 Telecommunications Services Sector Retail Combo PRO-08 Wireless Portfolio Wireless Portfolio-Default USD ($)
1 year	$ 89
3 years	278
5 years	482
10 years	$ 1,073

Portfolio Turnover

The fund pays transaction costs, such as commissions, when it buys and sells securities (or "turns over" its portfolio). A higher portfolio turnover rate may indicate higher transaction costs and may result in higher taxes when fund shares are held in a taxable account. These costs, which are not reflected in annual operating expenses or in the example, affect the fund's performance. During the most recent fiscal year, the fund's portfolio turnover rate was 98% of the average value of its portfolio.

Principal Investment Strategies

• Normally investing primarily in common stocks.

• Normally investing at least 80% of assets in securities of companies principally engaged in activities relating to wireless communications services or products.

• Investing in domestic and foreign issuers.

• Using fundamental analysis of factors such as each issuer's financial condition and industry position, as well as market and economic conditions, to select investments.

Principal Investment Risks

• Stock Market Volatility. Stock markets are volatile and can decline significantly in response to adverse issuer, political, regulatory, market, or economic developments. Different parts of the market, including different market sectors, and different types of securities can react differently to these developments.

• Foreign Exposure. Foreign markets can be more volatile than the U.S. market due to increased risks of adverse issuer, political, regulatory, market, or economic developments and can perform differently from the U.S. market.

• Wireless Industry Concentration. The wireless industry can be significantly affected by failure or delays in obtaining financing or regulatory approval, intense competition, product incompatibility, changing consumer preferences, rapid obsolescence, significant capital expenditures, and heavy debt burdens.

• Issuer-Specific Changes. The value of an individual security or particular type of security can be more volatile than, and can perform differently from, the market as a whole. The value of securities of smaller issuers can be more volatile than that of larger issuers.

In addition, the fund is considered non-diversified and can invest a greater portion of assets in securities of a smaller number of individual issuers than a diversified fund. As a result, changes in the market value of a single investment could cause greater fluctuations in share price than would occur in a more diversified fund.

An investment in the fund is not a deposit of a bank and is not insured or guaranteed by the Federal Deposit Insurance Corporation or any other government agency. You could lose money by investing in the fund.

Performance

The following information is intended to help you understand the risks of investing in the fund. The information illustrates the changes in the performance of the fund's shares from year to year and compares the performance of the fund's shares to the performance of a securities market index and an additional index over various periods of time. The indexes have characteristics relevant to the fund's investment strategies. Index descriptions appear in the Additional Index Information section of the prospectus. Past performance (before and after taxes) is not an indication of future performance.

Visit www.fidelity.com for more recent performance information.

Year-by-Year Returns

Calendar Years

During the periods shown in the chart:	Returns	Quarter ended
Highest Quarter Return	24.64%	June 30, 2009
Lowest Quarter Return	-24.68%	December 31, 2008
Year-to-Date Return	12.14%	March 31, 2017

Average Annual Returns

After-tax returns are calculated using the historical highest individual federal marginal income tax rates, but do not reflect the impact of state or local taxes. Actual after-tax returns may differ depending on your individual circumstances. The after-tax returns shown are not relevant if you hold your shares in a retirement account or in another tax-deferred arrangement, such as an employee benefit plan (profit sharing, 401(k), or 403(b) plan).

For the periods ended December 31, 2016

Average Annual Total Returns{- Wireless Portfolio} - 02.28 Select Portfolios: Group 9 Telecommunications Services Sector Retail Combo PRO-08 - Wireless Portfolio	Past 1 year	Past 5 years	Past 10 years
Wireless Portfolio-Default | Return Before Taxes	10.07%	10.38%	6.68%
Wireless Portfolio-Default | After Taxes on Distributions	8.37%	8.60%	5.57%
Wireless Portfolio-Default | After Taxes on Distributions and Sales	6.98%	8.09%	5.27%
S&P 500® Index(reflects no deduction for fees, expenses, or taxes)	11.96%	14.66%	6.95%
Fidelity® Wireless Index(reflects no deduction for fees, expenses, or taxes)	9.44%	8.51%	2.62%

XML

Label

Element

Value

Risk/Return:

rr_RiskReturnAbstract

Registrant Name

dei_EntityRegistrantName

FIDELITY SELECT PORTFOLIOS

Prospectus Date

rr_ProspectusDate

Apr. 29, 2017

02.28 Select Portfolios: Group 9 Telecommunications Services Sector Retail Combo PRO-08 | Wireless Portfolio

Risk/Return:

rr_RiskReturnAbstract

Risk/Return [Heading]

rr_RiskReturnHeading

Fund Summary

Fund:
Wireless Portfolio

Objective [Heading]

rr_ObjectiveHeading

Investment Objective

Objective, Primary [Text Block]

rr_ObjectivePrimaryTextBlock

The fund seeks capital appreciation.

Expense [Heading]

rr_ExpenseHeading

Fee Table

Expense Narrative [Text Block]

rr_ExpenseNarrativeTextBlock

The following table describes the fees and expenses that may be incurred when you buy and hold shares of the fund.

Shareholder Fees Caption [Text]

rr_ShareholderFeesCaption

Shareholder fees

(fees paid directly from your investment)

Operating Expenses Caption [Text]

rr_OperatingExpensesCaption

Annual Operating Expenses

(expenses that you pay each year as a % of the value of your investment)

Portfolio Turnover [Heading]

rr_PortfolioTurnoverHeading

Portfolio Turnover

Portfolio Turnover [Text Block]

rr_PortfolioTurnoverTextBlock

The fund pays transaction costs, such as commissions, when it buys and sells securities (or "turns over" its portfolio). A higher portfolio turnover rate may indicate higher transaction costs and may result in higher taxes when fund shares are held in a taxable account. These costs, which are not reflected in annual operating expenses or in the example, affect the fund's performance. During the most recent fiscal year, the fund's portfolio turnover rate was 98% of the average value of its portfolio.

Portfolio Turnover, Rate

rr_PortfolioTurnoverRate

98.00%

Expense Example Narrative [Text Block]

rr_ExpenseExampleNarrativeTextBlock

This example helps compare the cost of investing in the fund with the cost of investing in other funds.

Let's say, hypothetically, that the annual return for shares of the fund is 5% and that your shareholder fees and the annual operating expenses for shares of the fund are exactly as described in the fee table. This example illustrates the effect of fees and expenses, but is not meant to suggest actual or expected fees and expenses or returns, all of which may vary. For every $10,000 you invested, here's how much you would pay in total expenses if you sell all of your shares at the end of each time period indicated:

Expense Example by, Year, Caption [Text]

rr_ExpenseExampleByYearCaption

Sell All Shares

Strategy [Heading]

rr_StrategyHeading

Principal Investment Strategies

Strategy Narrative [Text Block]

rr_StrategyNarrativeTextBlock

• Normally investing primarily in common stocks.

• Normally investing at least 80% of assets in securities of companies principally engaged in activities relating to wireless communications services or products.

• Investing in domestic and foreign issuers.

• Using fundamental analysis of factors such as each issuer's financial condition and industry position, as well as market and economic conditions, to select investments.

Risk [Heading]

rr_RiskHeading

Principal Investment Risks

Risk Narrative [Text Block]

rr_RiskNarrativeTextBlock

• Stock Market Volatility. Stock markets are volatile and can decline significantly in response to adverse issuer, political, regulatory, market, or economic developments. Different parts of the market, including different market sectors, and different types of securities can react differently to these developments.

• Foreign Exposure. Foreign markets can be more volatile than the U.S. market due to increased risks of adverse issuer, political, regulatory, market, or economic developments and can perform differently from the U.S. market.

• Wireless Industry Concentration. The wireless industry can be significantly affected by failure or delays in obtaining financing or regulatory approval, intense competition, product incompatibility, changing consumer preferences, rapid obsolescence, significant capital expenditures, and heavy debt burdens.

• Issuer-Specific Changes. The value of an individual security or particular type of security can be more volatile than, and can perform differently from, the market as a whole. The value of securities of smaller issuers can be more volatile than that of larger issuers.

In addition, the fund is considered non-diversified and can invest a greater portion of assets in securities of a smaller number of individual issuers than a diversified fund. As a result, changes in the market value of a single investment could cause greater fluctuations in share price than would occur in a more diversified fund.

An investment in the fund is not a deposit of a bank and is not insured or guaranteed by the Federal Deposit Insurance Corporation or any other government agency. You could lose money by investing in the fund.

Risk Lose Money [Text]

rr_RiskLoseMoney

You could lose money by investing in the fund.

Risk Nondiversified Status [Text]

rr_RiskNondiversifiedStatus

In addition, the fund is considered non-diversified and can invest a greater portion of assets in securities of a smaller number of individual issuers than a diversified fund. As a result, changes in the market value of a single investment could cause greater fluctuations in share price than would occur in a more diversified fund.

Risk Not Insured Depository Institution [Text]

rr_RiskNotInsuredDepositoryInstitution

An investment in the fund is not a deposit of a bank and is not insured or guaranteed by the Federal Deposit Insurance Corporation or any other government agency.

Bar Chart and Performance Table [Heading]

rr_BarChartAndPerformanceTableHeading

Performance

Performance Narrative [Text Block]

rr_PerformanceNarrativeTextBlock

The following information is intended to help you understand the risks of investing in the fund. The information illustrates the changes in the performance of the fund's shares from year to year and compares the performance of the fund's shares to the performance of a securities market index and an additional index over various periods of time. The indexes have characteristics relevant to the fund's investment strategies. Index descriptions appear in the Additional Index Information section of the prospectus. Past performance (before and after taxes) is not an indication of future performance.

Visit www.fidelity.com for more recent performance information.

Performance Information Illustrates Variability of Returns [Text]

rr_PerformanceInformationIllustratesVariabilityOfReturns

The information illustrates the changes in the performance of the fund's shares from year to year and compares the performance of the fund's shares to the performance of a securities market index and an additional index over various periods of time.

Performance Availability Website Address [Text]

rr_PerformanceAvailabilityWebSiteAddress

www.fidelity.com

Performance Past Does Not Indicate Future [Text]

rr_PerformancePastDoesNotIndicateFuture

Past performance (before and after taxes) is not an indication of future performance.

Bar Chart [Heading]

rr_BarChartHeading

Year-by-Year Returns

Calendar Years

Bar Chart Closing [Text Block]

rr_BarChartClosingTextBlock

During the periods shown in the chart:	Returns	Quarter ended
Highest Quarter Return	24.64%	June 30, 2009
Lowest Quarter Return	-24.68%	December 31, 2008
Year-to-Date Return	12.14%	March 31, 2017

Performance Table Heading

rr_PerformanceTableHeading

Average Annual Returns

Performance Table Uses Highest Federal Rate

rr_PerformanceTableUsesHighestFederalRate

After-tax returns are calculated using the historical highest individual federal marginal income tax rates, but do not reflect the impact of state or local taxes.

Performance Table Not Relevant to Tax Deferred

rr_PerformanceTableNotRelevantToTaxDeferred

The after-tax returns shown are not relevant if you hold your shares in a retirement account or in another tax-deferred arrangement, such as an employee benefit plan (profit sharing, 401(k), or 403(b) plan).

Performance Table Narrative

rr_PerformanceTableNarrativeTextBlock

After-tax returns are calculated using the historical highest individual federal marginal income tax rates, but do not reflect the impact of state or local taxes. Actual after-tax returns may differ depending on your individual circumstances. The after-tax returns shown are not relevant if you hold your shares in a retirement account or in another tax-deferred arrangement, such as an employee benefit plan (profit sharing, 401(k), or 403(b) plan).

For the periods ended December 31, 2016

02.28 Select Portfolios: Group 9 Telecommunications Services Sector Retail Combo PRO-08 | Wireless Portfolio | Wireless Portfolio-Default

Risk/Return:

rr_RiskReturnAbstract

Redemption fee on shares held less than 30 days (as a % of amount redeemed)

rr_RedemptionFeeOverRedemption

0.75%

Management fee

rr_ManagementFeesOverAssets

0.55%

Distribution and/or Service (12b-1) fees

rr_DistributionAndService12b1FeesOverAssets

none

Other expenses

rr_OtherExpensesOverAssets

0.32%

Total annual operating expenses

rr_ExpensesOverAssets

0.87%

1 year

rr_ExpenseExampleYear01

$ 89

3 years

rr_ExpenseExampleYear03

278

5 years

rr_ExpenseExampleYear05

482

10 years

rr_ExpenseExampleYear10

$ 1,073

2007

rr_AnnualReturn2007

27.46%

2008

rr_AnnualReturn2008

(49.62%)

2009

rr_AnnualReturn2009

59.02%

2010

rr_AnnualReturn2010

15.17%

2011

rr_AnnualReturn2011

(0.96%)

2012

rr_AnnualReturn2012

16.30%

2013

rr_AnnualReturn2013

28.26%

2014

rr_AnnualReturn2014

2.98%

2015

rr_AnnualReturn2015

(3.09%)

2016

rr_AnnualReturn2016

10.07%

Year to Date Return, Label

rr_YearToDateReturnLabel

Year-to-Date Return

Bar Chart, Year to Date Return, Date

rr_BarChartYearToDateReturnDate

Mar. 31, 2017

Bar Chart, Year to Date Return

rr_BarChartYearToDateReturn

12.14%

Highest Quarterly Return, Label

rr_HighestQuarterlyReturnLabel

Highest Quarter Return

Highest Quarterly Return, Date

rr_BarChartHighestQuarterlyReturnDate

Jun. 30, 2009

Highest Quarterly Return

rr_BarChartHighestQuarterlyReturn

24.64%

Lowest Quarterly Return, Label

rr_LowestQuarterlyReturnLabel

Lowest Quarter Return

Lowest Quarterly Return, Date

rr_BarChartLowestQuarterlyReturnDate

Dec. 31, 2008

Lowest Quarterly Return

rr_BarChartLowestQuarterlyReturn

(24.68%)

02.28 Select Portfolios: Group 9 Telecommunications Services Sector Retail Combo PRO-08 | Wireless Portfolio | Return Before Taxes | Wireless Portfolio-Default

Risk/Return:

rr_RiskReturnAbstract

Column

rr_AverageAnnualReturnColumnName

Wireless Portfolio

Label

rr_AverageAnnualReturnLabel

Return Before Taxes

Past 1 year

rr_AverageAnnualReturnYear01

10.07%

Past 5 years

rr_AverageAnnualReturnYear05

10.38%

Past 10 years

rr_AverageAnnualReturnYear10

6.68%

02.28 Select Portfolios: Group 9 Telecommunications Services Sector Retail Combo PRO-08 | Wireless Portfolio | After Taxes on Distributions | Wireless Portfolio-Default

Risk/Return:

rr_RiskReturnAbstract

Column

rr_AverageAnnualReturnColumnName

Wireless Portfolio

Label

rr_AverageAnnualReturnLabel

Return After Taxes on Distributions

Past 1 year

rr_AverageAnnualReturnYear01

8.37%

Past 5 years

rr_AverageAnnualReturnYear05

8.60%

Past 10 years

rr_AverageAnnualReturnYear10

5.57%

02.28 Select Portfolios: Group 9 Telecommunications Services Sector Retail Combo PRO-08 | Wireless Portfolio | After Taxes on Distributions and Sales | Wireless Portfolio-Default

Risk/Return:

rr_RiskReturnAbstract

Column

rr_AverageAnnualReturnColumnName

Wireless Portfolio

Label

rr_AverageAnnualReturnLabel

Return After Taxes on Distributions and Sale of Fund Shares

Past 1 year

rr_AverageAnnualReturnYear01

6.98%

Past 5 years

rr_AverageAnnualReturnYear05

8.09%

Past 10 years

rr_AverageAnnualReturnYear10

5.27%

02.28 Select Portfolios: Group 9 Telecommunications Services Sector Retail Combo PRO-08 | Wireless Portfolio | S&P 500® Index(reflects no deduction for fees, expenses, or taxes)

Risk/Return:

rr_RiskReturnAbstract

Past 1 year

rr_AverageAnnualReturnYear01

11.96%

Past 5 years

rr_AverageAnnualReturnYear05

14.66%

Past 10 years

rr_AverageAnnualReturnYear10

6.95%

02.28 Select Portfolios: Group 9 Telecommunications Services Sector Retail Combo PRO-08 | Wireless Portfolio | Fidelity® Wireless Index(reflects no deduction for fees, expenses, or taxes)

Risk/Return:

rr_RiskReturnAbstract

Past 1 year

rr_AverageAnnualReturnYear01

9.44%

Past 5 years

rr_AverageAnnualReturnYear05

8.51%

Past 10 years

rr_AverageAnnualReturnYear10

2.62%

XML

02.28 Select Portfolios: Group 2 Consumer Staples Sector Retail PRO-03 | Consumer Staples Portfolio

Fund Summary

Fund/Class:
Consumer Staples Portfolio/Consumer Staples Portfolio

Investment Objective

The fund seeks capital appreciation.

Fee Table

The following table describes the fees and expenses that may be incurred when you buy and hold shares of the fund.

Shareholder fees

Shareholder Fees {- Consumer Staples Portfolio}	02.28 Select Portfolios: Group 2 Consumer Staples Sector Retail PRO-03 Consumer Staples Portfolio USD ($)
(fees paid directly from your investment)	none

Annual Operating Expenses

(expenses that you pay each year as a % of the value of your investment)

Annual Operating Expenses {- Consumer Staples Portfolio}	02.28 Select Portfolios: Group 2 Consumer Staples Sector Retail PRO-03 Consumer Staples Portfolio Consumer Staples Portfolio-Retail Class
Management fee	0.55%
Distribution and/or Service (12b-1) fees	none
Other expenses	0.21%
Total annual operating expenses	0.76%

This example helps compare the cost of investing in the fund with the cost of investing in other funds.

Let's say, hypothetically, that the annual return for shares of the fund is 5% and that your shareholder fees and the annual operating expenses for shares of the fund are exactly as described in the fee table. This example illustrates the effect of fees and expenses, but is not meant to suggest actual or expected fees and expenses or returns, all of which may vary. For every $10,000 you invested, here's how much you would pay in total expenses if you sell all of your shares at the end of each time period indicated:

Sell All Shares

Expense Example {- Consumer Staples Portfolio}	02.28 Select Portfolios: Group 2 Consumer Staples Sector Retail PRO-03 Consumer Staples Portfolio Consumer Staples Portfolio-Retail Class USD ($)
1 year	$ 78
3 years	243
5 years	422
10 years	$ 942

Portfolio Turnover

The fund pays transaction costs, such as commissions, when it buys and sells securities (or "turns over" its portfolio). A higher portfolio turnover rate may indicate higher transaction costs and may result in higher taxes when fund shares are held in a taxable account. These costs, which are not reflected in annual operating expenses or in the example, affect the fund's performance. During the most recent fiscal year, the fund's portfolio turnover rate was 56% of the average value of its portfolio.

Principal Investment Strategies

• Normally investing primarily in common stocks.

• Normally investing at least 80% of assets in securities of companies principally engaged in the manufacture, sale, or distribution of consumer staples.

• Investing in domestic and foreign issuers.

• Using fundamental analysis of factors such as each issuer's financial condition and industry position, as well as market and economic conditions, to select investments.

Principal Investment Risks

• Stock Market Volatility. Stock markets are volatile and can decline significantly in response to adverse issuer, political, regulatory, market, or economic developments. Different parts of the market, including different market sectors, and different types of securities can react differently to these developments.

• Foreign Exposure. Foreign markets can be more volatile than the U.S. market due to increased risks of adverse issuer, political, regulatory, market, or economic developments and can perform differently from the U.S. market.

• Consumer Staples Industry Concentration. The consumer staples industries can be significantly affected by demographics and product trends, competitive pricing, food fads, marketing campaigns, environmental factors, government regulation, the performance of the overall economy, interest rates, consumer confidence, and the cost of commodities.

• Issuer-Specific Changes. The value of an individual security or particular type of security can be more volatile than, and can perform differently from, the market as a whole. The value of securities of smaller issuers can be more volatile than that of larger issuers.

In addition, the fund is considered non-diversified and can invest a greater portion of assets in securities of a smaller number of individual issuers than a diversified fund. As a result, changes in the market value of a single investment could cause greater fluctuations in share price than would occur in a more diversified fund.

An investment in the fund is not a deposit of a bank and is not insured or guaranteed by the Federal Deposit Insurance Corporation or any other government agency. You could lose money by investing in the fund.

Performance

The following information is intended to help you understand the risks of investing in the fund. The information illustrates the changes in the performance of the fund's shares from year to year and compares the performance of the fund's shares to the performance of a securities market index and an additional index over various periods of time. The indexes have characteristics relevant to the fund's investment strategies. Index descriptions appear in the Additional Index Information section of the prospectus. Prior to October 1, 2006, the fund was named Food and Agriculture Portfolio, and the fund operated under certain different investment policies and compared its performance to a different additional index. The fund's historical performance may not represent its current investment policies. Past performance (before and after taxes) is not an indication of future performance.

Visit www.fidelity.com for more recent performance information.

Year-by-Year Returns

Calendar Years

During the periods shown in the chart:	Returns	Quarter ended
Highest Quarter Return	14.48%	June 30, 2009
Lowest Quarter Return	-12.95%	December 31, 2008
Year-to-Date Return	9.28%	March 31, 2017

Average Annual Returns

After-tax returns are calculated using the historical highest individual federal marginal income tax rates, but do not reflect the impact of state or local taxes. Actual after-tax returns may differ depending on your individual circumstances. The after-tax returns shown are not relevant if you hold your shares in a retirement account or in another tax-deferred arrangement, such as an employee benefit plan (profit sharing, 401(k), or 403(b) plan). Return After Taxes on Distributions and Sale of Fund Shares may be higher than other returns for the same period due to a tax benefit of realizing a capital loss upon the sale of fund shares.

For the periods ended December 31, 2016

Average Annual Total Returns{- Consumer Staples Portfolio} - 02.28 Select Portfolios: Group 2 Consumer Staples Sector Retail PRO-03 - Consumer Staples Portfolio	Past 1 year	Past 5 years	Past 10 years
Consumer Staples Portfolio-Retail Class | Return Before Taxes	3.07%	11.12%	9.26%
Consumer Staples Portfolio-Retail Class | After Taxes on Distributions	1.96%	9.63%	8.28%
Consumer Staples Portfolio-Retail Class | After Taxes on Distributions and Sales	2.65%	8.77%	7.53%
S&P 500® Index(reflects no deduction for fees, expenses, or taxes)	11.96%	14.66%	6.95%
MSCI U.S. IMI Consumer Staples 25-50 Index(reflects no deduction for fees, expenses, or taxes)	6.39%	13.28%	10.36%

XML

Label

Element

Value

Risk/Return:

rr_RiskReturnAbstract

Registrant Name

dei_EntityRegistrantName

FIDELITY SELECT PORTFOLIOS

Prospectus Date

rr_ProspectusDate

Apr. 29, 2017

02.28 Select Portfolios: Group 2 Consumer Staples Sector Retail PRO-03 | Consumer Staples Portfolio

Risk/Return:

rr_RiskReturnAbstract

Risk/Return [Heading]

rr_RiskReturnHeading

Fund Summary

Fund/Class:
Consumer Staples Portfolio/Consumer Staples Portfolio

Objective [Heading]

rr_ObjectiveHeading

Investment Objective

Objective, Primary [Text Block]

rr_ObjectivePrimaryTextBlock

The fund seeks capital appreciation.

Expense [Heading]

rr_ExpenseHeading

Fee Table

Expense Narrative [Text Block]

rr_ExpenseNarrativeTextBlock

The following table describes the fees and expenses that may be incurred when you buy and hold shares of the fund.

Shareholder Fees Caption [Text]

rr_ShareholderFeesCaption

Shareholder fees

(fees paid directly from your investment)

rr_ShareholderFeeOther

none

Operating Expenses Caption [Text]

rr_OperatingExpensesCaption

Annual Operating Expenses

(expenses that you pay each year as a % of the value of your investment)

Portfolio Turnover [Heading]

rr_PortfolioTurnoverHeading

Portfolio Turnover

Portfolio Turnover [Text Block]

rr_PortfolioTurnoverTextBlock

The fund pays transaction costs, such as commissions, when it buys and sells securities (or "turns over" its portfolio). A higher portfolio turnover rate may indicate higher transaction costs and may result in higher taxes when fund shares are held in a taxable account. These costs, which are not reflected in annual operating expenses or in the example, affect the fund's performance. During the most recent fiscal year, the fund's portfolio turnover rate was 56% of the average value of its portfolio.

Portfolio Turnover, Rate

rr_PortfolioTurnoverRate

56.00%

Expense Example Narrative [Text Block]

rr_ExpenseExampleNarrativeTextBlock

This example helps compare the cost of investing in the fund with the cost of investing in other funds.

Let's say, hypothetically, that the annual return for shares of the fund is 5% and that your shareholder fees and the annual operating expenses for shares of the fund are exactly as described in the fee table. This example illustrates the effect of fees and expenses, but is not meant to suggest actual or expected fees and expenses or returns, all of which may vary. For every $10,000 you invested, here's how much you would pay in total expenses if you sell all of your shares at the end of each time period indicated:

Expense Example by, Year, Caption [Text]

rr_ExpenseExampleByYearCaption

Sell All Shares

Strategy [Heading]

rr_StrategyHeading

Principal Investment Strategies

Strategy Narrative [Text Block]

rr_StrategyNarrativeTextBlock

• Normally investing primarily in common stocks.

• Normally investing at least 80% of assets in securities of companies principally engaged in the manufacture, sale, or distribution of consumer staples.

• Investing in domestic and foreign issuers.

• Using fundamental analysis of factors such as each issuer's financial condition and industry position, as well as market and economic conditions, to select investments.

Strategy Portfolio Concentration [Text]

rr_StrategyPortfolioConcentration

Normally investing at least 80% of assets in securities of companies principally engaged in the manufacture, sale, or distribution of consumer staples.

Risk [Heading]

rr_RiskHeading

Principal Investment Risks

Risk Narrative [Text Block]

rr_RiskNarrativeTextBlock

• Stock Market Volatility. Stock markets are volatile and can decline significantly in response to adverse issuer, political, regulatory, market, or economic developments. Different parts of the market, including different market sectors, and different types of securities can react differently to these developments.

• Foreign Exposure. Foreign markets can be more volatile than the U.S. market due to increased risks of adverse issuer, political, regulatory, market, or economic developments and can perform differently from the U.S. market.

• Consumer Staples Industry Concentration. The consumer staples industries can be significantly affected by demographics and product trends, competitive pricing, food fads, marketing campaigns, environmental factors, government regulation, the performance of the overall economy, interest rates, consumer confidence, and the cost of commodities.

• Issuer-Specific Changes. The value of an individual security or particular type of security can be more volatile than, and can perform differently from, the market as a whole. The value of securities of smaller issuers can be more volatile than that of larger issuers.

In addition, the fund is considered non-diversified and can invest a greater portion of assets in securities of a smaller number of individual issuers than a diversified fund. As a result, changes in the market value of a single investment could cause greater fluctuations in share price than would occur in a more diversified fund.

An investment in the fund is not a deposit of a bank and is not insured or guaranteed by the Federal Deposit Insurance Corporation or any other government agency. You could lose money by investing in the fund.

Risk Lose Money [Text]

rr_RiskLoseMoney

You could lose money by investing in the fund.

Risk Nondiversified Status [Text]

rr_RiskNondiversifiedStatus

In addition, the fund is considered non-diversified and can invest a greater portion of assets in securities of a smaller number of individual issuers than a diversified fund. As a result, changes in the market value of a single investment could cause greater fluctuations in share price than would occur in a more diversified fund.

Risk Not Insured Depository Institution [Text]

rr_RiskNotInsuredDepositoryInstitution

An investment in the fund is not a deposit of a bank and is not insured or guaranteed by the Federal Deposit Insurance Corporation or any other government agency.

Bar Chart and Performance Table [Heading]

rr_BarChartAndPerformanceTableHeading

Performance

Performance Narrative [Text Block]

rr_PerformanceNarrativeTextBlock

The following information is intended to help you understand the risks of investing in the fund. The information illustrates the changes in the performance of the fund's shares from year to year and compares the performance of the fund's shares to the performance of a securities market index and an additional index over various periods of time. The indexes have characteristics relevant to the fund's investment strategies. Index descriptions appear in the Additional Index Information section of the prospectus. Prior to October 1, 2006, the fund was named Food and Agriculture Portfolio, and the fund operated under certain different investment policies and compared its performance to a different additional index. The fund's historical performance may not represent its current investment policies. Past performance (before and after taxes) is not an indication of future performance.

Visit www.fidelity.com for more recent performance information.

Performance Information Illustrates Variability of Returns [Text]

rr_PerformanceInformationIllustratesVariabilityOfReturns

The information illustrates the changes in the performance of the fund's shares from year to year and compares the performance of the fund's shares to the performance of a securities market index and an additional index over various periods of time.

Performance Availability Website Address [Text]

rr_PerformanceAvailabilityWebSiteAddress

www.fidelity.com

Performance Past Does Not Indicate Future [Text]

rr_PerformancePastDoesNotIndicateFuture

Past performance (before and after taxes) is not an indication of future performance.

Bar Chart [Heading]

rr_BarChartHeading

Year-by-Year Returns

Calendar Years

Bar Chart Closing [Text Block]

rr_BarChartClosingTextBlock

During the periods shown in the chart:	Returns	Quarter ended
Highest Quarter Return	14.48%	June 30, 2009
Lowest Quarter Return	-12.95%	December 31, 2008
Year-to-Date Return	9.28%	March 31, 2017

Performance Table Heading

rr_PerformanceTableHeading

Average Annual Returns

Performance Table Uses Highest Federal Rate

rr_PerformanceTableUsesHighestFederalRate

After-tax returns are calculated using the historical highest individual federal marginal income tax rates, but do not reflect the impact of state or local taxes.

Performance Table Not Relevant to Tax Deferred

rr_PerformanceTableNotRelevantToTaxDeferred

The after-tax returns shown are not relevant if you hold your shares in a retirement account or in another tax-deferred arrangement, such as an employee benefit plan (profit sharing, 401(k), or 403(b) plan).

Performance Table Explanation after Tax Higher

rr_PerformanceTableExplanationAfterTaxHigher

Return After Taxes on Distributions and Sale of Fund Shares may be higher than other returns for the same period due to a tax benefit of realizing a capital loss upon the sale of fund shares.

Performance Table Narrative

rr_PerformanceTableNarrativeTextBlock

After-tax returns are calculated using the historical highest individual federal marginal income tax rates, but do not reflect the impact of state or local taxes. Actual after-tax returns may differ depending on your individual circumstances. The after-tax returns shown are not relevant if you hold your shares in a retirement account or in another tax-deferred arrangement, such as an employee benefit plan (profit sharing, 401(k), or 403(b) plan). Return After Taxes on Distributions and Sale of Fund Shares may be higher than other returns for the same period due to a tax benefit of realizing a capital loss upon the sale of fund shares.

For the periods ended December 31, 2016

02.28 Select Portfolios: Group 2 Consumer Staples Sector Retail PRO-03 | Consumer Staples Portfolio | Consumer Staples Portfolio-Retail Class

Risk/Return:

rr_RiskReturnAbstract

Management fee

rr_ManagementFeesOverAssets

0.55%

Distribution and/or Service (12b-1) fees

rr_DistributionAndService12b1FeesOverAssets

none

Other expenses

rr_OtherExpensesOverAssets

0.21%

Total annual operating expenses

rr_ExpensesOverAssets

0.76%

1 year

rr_ExpenseExampleYear01

$ 78

3 years

rr_ExpenseExampleYear03

243

5 years

rr_ExpenseExampleYear05

422

10 years

rr_ExpenseExampleYear10

$ 942

2007

rr_AnnualReturn2007

21.49%

2008

rr_AnnualReturn2008

(22.31%)

2009

rr_AnnualReturn2009

20.93%

2010

rr_AnnualReturn2010

15.20%

2011

rr_AnnualReturn2011

8.84%

2012

rr_AnnualReturn2012

15.39%

2013

rr_AnnualReturn2013

21.63%

2014

rr_AnnualReturn2014

14.91%

2015

rr_AnnualReturn2015

1.90%

2016

rr_AnnualReturn2016

3.07%

Year to Date Return, Label

rr_YearToDateReturnLabel

Year-to-Date Return

Bar Chart, Year to Date Return, Date

rr_BarChartYearToDateReturnDate

Mar. 31, 2017

Bar Chart, Year to Date Return

rr_BarChartYearToDateReturn

9.28%

Highest Quarterly Return, Label

rr_HighestQuarterlyReturnLabel

Highest Quarter Return

Highest Quarterly Return, Date

rr_BarChartHighestQuarterlyReturnDate

Jun. 30, 2009

Highest Quarterly Return

rr_BarChartHighestQuarterlyReturn

14.48%

Lowest Quarterly Return, Label

rr_LowestQuarterlyReturnLabel

Lowest Quarter Return

Lowest Quarterly Return, Date

rr_BarChartLowestQuarterlyReturnDate

Dec. 31, 2008

Lowest Quarterly Return

rr_BarChartLowestQuarterlyReturn

(12.95%)

02.28 Select Portfolios: Group 2 Consumer Staples Sector Retail PRO-03 | Consumer Staples Portfolio | Return Before Taxes | Consumer Staples Portfolio-Retail Class

Risk/Return:

rr_RiskReturnAbstract

Column

rr_AverageAnnualReturnColumnName

Consumer Staples Portfolio

Label

rr_AverageAnnualReturnLabel

Return Before Taxes

Past 1 year

rr_AverageAnnualReturnYear01

3.07%

Past 5 years

rr_AverageAnnualReturnYear05

11.12%

Past 10 years

rr_AverageAnnualReturnYear10

9.26%

02.28 Select Portfolios: Group 2 Consumer Staples Sector Retail PRO-03 | Consumer Staples Portfolio | After Taxes on Distributions | Consumer Staples Portfolio-Retail Class

Risk/Return:

rr_RiskReturnAbstract

Column

rr_AverageAnnualReturnColumnName

Consumer Staples Portfolio

Label

rr_AverageAnnualReturnLabel

Return After Taxes on Distributions

Past 1 year

rr_AverageAnnualReturnYear01

1.96%

Past 5 years

rr_AverageAnnualReturnYear05

9.63%

Past 10 years

rr_AverageAnnualReturnYear10

8.28%

02.28 Select Portfolios: Group 2 Consumer Staples Sector Retail PRO-03 | Consumer Staples Portfolio | After Taxes on Distributions and Sales | Consumer Staples Portfolio-Retail Class

Risk/Return:

rr_RiskReturnAbstract

Column

rr_AverageAnnualReturnColumnName

Consumer Staples Portfolio

Label

rr_AverageAnnualReturnLabel

Return After Taxes on Distributions and Sale of Fund Shares

Past 1 year

rr_AverageAnnualReturnYear01

2.65%

Past 5 years

rr_AverageAnnualReturnYear05

8.77%

Past 10 years

rr_AverageAnnualReturnYear10

7.53%

02.28 Select Portfolios: Group 2 Consumer Staples Sector Retail PRO-03 | Consumer Staples Portfolio | S&P 500® Index(reflects no deduction for fees, expenses, or taxes)

Risk/Return:

rr_RiskReturnAbstract

Past 1 year

rr_AverageAnnualReturnYear01

11.96%

Past 5 years

rr_AverageAnnualReturnYear05

14.66%

Past 10 years

rr_AverageAnnualReturnYear10

6.95%

02.28 Select Portfolios: Group 2 Consumer Staples Sector Retail PRO-03 | Consumer Staples Portfolio | MSCI U.S. IMI Consumer Staples 25-50 Index(reflects no deduction for fees, expenses, or taxes)

Risk/Return:

rr_RiskReturnAbstract

Past 1 year

rr_AverageAnnualReturnYear01

6.39%

Past 5 years

rr_AverageAnnualReturnYear05

13.28%

Past 10 years

rr_AverageAnnualReturnYear10

10.36%

XML

02.28 Select Portfolios: Group 6 Industrials Sector Combo PRO-04 | Air Transportation Portfolio

Fund Summary

Fund:
Air Transportation Portfolio

Investment Objective

The fund seeks capital appreciation.

Fee Table

The following table describes the fees and expenses that may be incurred when you buy and hold shares of the fund.

Shareholder fees

(fees paid directly from your investment)

Shareholder Fees {- Air Transportation Portfolio}	02.28 Select Portfolios: Group 6 Industrials Sector Combo PRO-04 Air Transportation Portfolio Air Transportation Portfolio-Default
Redemption fee on shares held less than 30 days (as a % of amount redeemed)	0.75%

Annual Operating Expenses

(expenses that you pay each year as a % of the value of your investment)

Annual Operating Expenses {- Air Transportation Portfolio}	02.28 Select Portfolios: Group 6 Industrials Sector Combo PRO-04 Air Transportation Portfolio Air Transportation Portfolio-Default
Management fee	0.55%
Distribution and/or Service (12b-1) fees	none
Other expenses	0.30%
Total annual operating expenses	0.85%

This example helps compare the cost of investing in the fund with the cost of investing in other funds.

Let's say, hypothetically, that the annual return for shares of the fund is 5% and that your shareholder fees and the annual operating expenses for shares of the fund are exactly as described in the fee table. This example illustrates the effect of fees and expenses, but is not meant to suggest actual or expected fees and expenses or returns, all of which may vary. For every $10,000 you invested, here's how much you would pay in total expenses if you sell all of your shares at the end of each time period indicated:

Sell All Shares

Expense Example {- Air Transportation Portfolio}	02.28 Select Portfolios: Group 6 Industrials Sector Combo PRO-04 Air Transportation Portfolio Air Transportation Portfolio-Default USD ($)
1 year	$ 87
3 years	271
5 years	471
10 years	$ 1,049

Portfolio Turnover

The fund pays transaction costs, such as commissions, when it buys and sells securities (or "turns over" its portfolio). A higher portfolio turnover rate may indicate higher transaction costs and may result in higher taxes when fund shares are held in a taxable account. These costs, which are not reflected in annual operating expenses or in the example, affect the fund's performance. During the most recent fiscal year, the fund's portfolio turnover rate was 106% of the average value of its portfolio.

Principal Investment Strategies

• Normally investing primarily in common stocks.

• Normally investing at least 80% of assets in securities of companies principally engaged in the regional, national, and international movement of passengers, mail, and freight via aircraft.

• Investing in domestic and foreign issuers.

• Using fundamental analysis of factors such as each issuer's financial condition and industry position, as well as market and economic conditions, to select investments.

Principal Investment Risks

• Stock Market Volatility. Stock markets are volatile and can decline significantly in response to adverse issuer, political, regulatory, market, or economic developments. Different parts of the market, including different market sectors, and different types of securities can react differently to these developments.

• Foreign Exposure. Foreign markets can be more volatile than the U.S. market due to increased risks of adverse issuer, political, regulatory, market, or economic developments and can perform differently from the U.S. market.

• Air Transportation Industry Concentration. The air transportation industry can be significantly affected by competition within the industry, domestic and foreign economies, government regulation, labor relations, the price of fuel, and geopolitical developments.

• Issuer-Specific Changes. The value of an individual security or particular type of security can be more volatile than, and can perform differently from, the market as a whole. The value of securities of smaller issuers can be more volatile than that of larger issuers.

In addition, the fund is considered non-diversified and can invest a greater portion of assets in securities of a smaller number of individual issuers than a diversified fund. As a result, changes in the market value of a single investment could cause greater fluctuations in share price than would occur in a more diversified fund.

An investment in the fund is not a deposit of a bank and is not insured or guaranteed by the Federal Deposit Insurance Corporation or any other government agency. You could lose money by investing in the fund.

Performance

The following information is intended to help you understand the risks of investing in the fund. The information illustrates the changes in the performance of the fund's shares from year to year and compares the performance of the fund's shares to the performance of a securities market index and an additional index over various periods of time. The indexes have characteristics relevant to the fund's investment strategies. Index descriptions appear in the Additional Index Information section of the prospectus. Past performance (before and after taxes) is not an indication of future performance.

Visit www.fidelity.com for more recent performance information.

Year-by-Year Returns

Calendar Years

During the periods shown in the chart:	Returns	Quarter ended
Highest Quarter Return	35.56%	September 30, 2009
Lowest Quarter Return	-30.25%	March 31, 2009
Year-to-Date Return	0.03%	March 31, 2017

Average Annual Returns

After-tax returns are calculated using the historical highest individual federal marginal income tax rates, but do not reflect the impact of state or local taxes. Actual after-tax returns may differ depending on your individual circumstances. The after-tax returns shown are not relevant if you hold your shares in a retirement account or in another tax-deferred arrangement, such as an employee benefit plan (profit sharing, 401(k), or 403(b) plan).

For the periods ended December 31, 2016

Average Annual Total Returns{- Air Transportation Portfolio} - 02.28 Select Portfolios: Group 6 Industrials Sector Combo PRO-04 - Air Transportation Portfolio	Past 1 year	Past 5 years	Past 10 years
Air Transportation Portfolio-Default | Return Before Taxes	20.03%	20.33%	9.83%
Air Transportation Portfolio-Default | After Taxes on Distributions	19.84%	19.45%	8.88%
Air Transportation Portfolio-Default | After Taxes on Distributions and Sales	11.49%	16.48%	7.90%
S&P 500® Index(reflects no deduction for fees, expenses, or taxes)	11.96%	14.66%	6.95%
S&P® Custom Air Transportation Index(reflects no deduction for fees, expenses, or taxes)	20.12%	20.90%	8.58%

XML

Label

Element

Value

Risk/Return:

rr_RiskReturnAbstract

Registrant Name

dei_EntityRegistrantName

FIDELITY SELECT PORTFOLIOS

Prospectus Date

rr_ProspectusDate

Apr. 29, 2017

02.28 Select Portfolios: Group 6 Industrials Sector Combo PRO-04 | Air Transportation Portfolio

Risk/Return:

rr_RiskReturnAbstract

Risk/Return [Heading]

rr_RiskReturnHeading

Fund Summary

Fund:
Air Transportation Portfolio

Objective [Heading]

rr_ObjectiveHeading

Investment Objective

Objective, Primary [Text Block]

rr_ObjectivePrimaryTextBlock

The fund seeks capital appreciation.

Expense [Heading]

rr_ExpenseHeading

Fee Table

Expense Narrative [Text Block]

rr_ExpenseNarrativeTextBlock

The following table describes the fees and expenses that may be incurred when you buy and hold shares of the fund.

Shareholder Fees Caption [Text]

rr_ShareholderFeesCaption

Shareholder fees

(fees paid directly from your investment)

Operating Expenses Caption [Text]

rr_OperatingExpensesCaption

Annual Operating Expenses

(expenses that you pay each year as a % of the value of your investment)

Portfolio Turnover [Heading]

rr_PortfolioTurnoverHeading

Portfolio Turnover

Portfolio Turnover [Text Block]

rr_PortfolioTurnoverTextBlock

The fund pays transaction costs, such as commissions, when it buys and sells securities (or "turns over" its portfolio). A higher portfolio turnover rate may indicate higher transaction costs and may result in higher taxes when fund shares are held in a taxable account. These costs, which are not reflected in annual operating expenses or in the example, affect the fund's performance. During the most recent fiscal year, the fund's portfolio turnover rate was 106% of the average value of its portfolio.

Portfolio Turnover, Rate

rr_PortfolioTurnoverRate

106.00%

Expense Example Narrative [Text Block]

rr_ExpenseExampleNarrativeTextBlock

This example helps compare the cost of investing in the fund with the cost of investing in other funds.

Let's say, hypothetically, that the annual return for shares of the fund is 5% and that your shareholder fees and the annual operating expenses for shares of the fund are exactly as described in the fee table. This example illustrates the effect of fees and expenses, but is not meant to suggest actual or expected fees and expenses or returns, all of which may vary. For every $10,000 you invested, here's how much you would pay in total expenses if you sell all of your shares at the end of each time period indicated:

Expense Example by, Year, Caption [Text]

rr_ExpenseExampleByYearCaption

Sell All Shares

Strategy [Heading]

rr_StrategyHeading

Principal Investment Strategies

Strategy Narrative [Text Block]

rr_StrategyNarrativeTextBlock

• Normally investing primarily in common stocks.

• Normally investing at least 80% of assets in securities of companies principally engaged in the regional, national, and international movement of passengers, mail, and freight via aircraft.

• Investing in domestic and foreign issuers.

• Using fundamental analysis of factors such as each issuer's financial condition and industry position, as well as market and economic conditions, to select investments.

Risk [Heading]

rr_RiskHeading

Principal Investment Risks

Risk Narrative [Text Block]

rr_RiskNarrativeTextBlock

• Stock Market Volatility. Stock markets are volatile and can decline significantly in response to adverse issuer, political, regulatory, market, or economic developments. Different parts of the market, including different market sectors, and different types of securities can react differently to these developments.

• Foreign Exposure. Foreign markets can be more volatile than the U.S. market due to increased risks of adverse issuer, political, regulatory, market, or economic developments and can perform differently from the U.S. market.

• Air Transportation Industry Concentration. The air transportation industry can be significantly affected by competition within the industry, domestic and foreign economies, government regulation, labor relations, the price of fuel, and geopolitical developments.

• Issuer-Specific Changes. The value of an individual security or particular type of security can be more volatile than, and can perform differently from, the market as a whole. The value of securities of smaller issuers can be more volatile than that of larger issuers.

In addition, the fund is considered non-diversified and can invest a greater portion of assets in securities of a smaller number of individual issuers than a diversified fund. As a result, changes in the market value of a single investment could cause greater fluctuations in share price than would occur in a more diversified fund.

An investment in the fund is not a deposit of a bank and is not insured or guaranteed by the Federal Deposit Insurance Corporation or any other government agency. You could lose money by investing in the fund.

Risk Lose Money [Text]

rr_RiskLoseMoney

You could lose money by investing in the fund.

Risk Nondiversified Status [Text]

rr_RiskNondiversifiedStatus

In addition, the fund is considered non-diversified and can invest a greater portion of assets in securities of a smaller number of individual issuers than a diversified fund. As a result, changes in the market value of a single investment could cause greater fluctuations in share price than would occur in a more diversified fund.

Risk Not Insured Depository Institution [Text]

rr_RiskNotInsuredDepositoryInstitution

An investment in the fund is not a deposit of a bank and is not insured or guaranteed by the Federal Deposit Insurance Corporation or any other government agency.

Bar Chart and Performance Table [Heading]

rr_BarChartAndPerformanceTableHeading

Performance

Performance Narrative [Text Block]

rr_PerformanceNarrativeTextBlock

The following information is intended to help you understand the risks of investing in the fund. The information illustrates the changes in the performance of the fund's shares from year to year and compares the performance of the fund's shares to the performance of a securities market index and an additional index over various periods of time. The indexes have characteristics relevant to the fund's investment strategies. Index descriptions appear in the Additional Index Information section of the prospectus. Past performance (before and after taxes) is not an indication of future performance.

Visit www.fidelity.com for more recent performance information.

Performance Information Illustrates Variability of Returns [Text]

rr_PerformanceInformationIllustratesVariabilityOfReturns

The information illustrates the changes in the performance of the fund's shares from year to year and compares the performance of the fund's shares to the performance of a securities market index and an additional index over various periods of time.

Performance Availability Website Address [Text]

rr_PerformanceAvailabilityWebSiteAddress

www.fidelity.com

Performance Past Does Not Indicate Future [Text]

rr_PerformancePastDoesNotIndicateFuture

Past performance (before and after taxes) is not an indication of future performance.

Bar Chart [Heading]

rr_BarChartHeading

Year-by-Year Returns

Calendar Years

Bar Chart Closing [Text Block]

rr_BarChartClosingTextBlock

During the periods shown in the chart:	Returns	Quarter ended
Highest Quarter Return	35.56%	September 30, 2009
Lowest Quarter Return	-30.25%	March 31, 2009
Year-to-Date Return	0.03%	March 31, 2017

Performance Table Heading

rr_PerformanceTableHeading

Average Annual Returns

Performance Table Uses Highest Federal Rate

rr_PerformanceTableUsesHighestFederalRate

After-tax returns are calculated using the historical highest individual federal marginal income tax rates, but do not reflect the impact of state or local taxes.

Performance Table Not Relevant to Tax Deferred

rr_PerformanceTableNotRelevantToTaxDeferred

The after-tax returns shown are not relevant if you hold your shares in a retirement account or in another tax-deferred arrangement, such as an employee benefit plan (profit sharing, 401(k), or 403(b) plan).

Performance Table Narrative

rr_PerformanceTableNarrativeTextBlock

After-tax returns are calculated using the historical highest individual federal marginal income tax rates, but do not reflect the impact of state or local taxes. Actual after-tax returns may differ depending on your individual circumstances. The after-tax returns shown are not relevant if you hold your shares in a retirement account or in another tax-deferred arrangement, such as an employee benefit plan (profit sharing, 401(k), or 403(b) plan).

For the periods ended December 31, 2016

02.28 Select Portfolios: Group 6 Industrials Sector Combo PRO-04 | Air Transportation Portfolio | Air Transportation Portfolio-Default

Risk/Return:

rr_RiskReturnAbstract

Redemption fee on shares held less than 30 days (as a % of amount redeemed)

rr_RedemptionFeeOverRedemption

0.75%

Management fee

rr_ManagementFeesOverAssets

0.55%

Distribution and/or Service (12b-1) fees

rr_DistributionAndService12b1FeesOverAssets

none

Other expenses

rr_OtherExpensesOverAssets

0.30%

Total annual operating expenses

rr_ExpensesOverAssets

0.85%

1 year

rr_ExpenseExampleYear01

$ 87

3 years

rr_ExpenseExampleYear03

271

5 years

rr_ExpenseExampleYear05

471

10 years

rr_ExpenseExampleYear10

$ 1,049

2007

rr_AnnualReturn2007

(1.92%)

2008

rr_AnnualReturn2008

(32.57%)

2009

rr_AnnualReturn2009

22.26%

2010

rr_AnnualReturn2010

33.37%

2011

rr_AnnualReturn2011

(6.07%)

2012

rr_AnnualReturn2012

19.16%

2013

rr_AnnualReturn2013

50.65%

2014

rr_AnnualReturn2014

28.08%

2015

rr_AnnualReturn2015

(8.61%)

2016

rr_AnnualReturn2016

20.03%

Year to Date Return, Label

rr_YearToDateReturnLabel

Year-to-Date Return

Bar Chart, Year to Date Return, Date

rr_BarChartYearToDateReturnDate

Mar. 31, 2017

Bar Chart, Year to Date Return

rr_BarChartYearToDateReturn

0.03%

Highest Quarterly Return, Label

rr_HighestQuarterlyReturnLabel

Highest Quarter Return

Highest Quarterly Return, Date

rr_BarChartHighestQuarterlyReturnDate

Sep. 30, 2009

Highest Quarterly Return

rr_BarChartHighestQuarterlyReturn

35.56%

Lowest Quarterly Return, Label

rr_LowestQuarterlyReturnLabel

Lowest Quarter Return

Lowest Quarterly Return, Date

rr_BarChartLowestQuarterlyReturnDate

Mar. 31, 2009

Lowest Quarterly Return

rr_BarChartLowestQuarterlyReturn

(30.25%)

02.28 Select Portfolios: Group 6 Industrials Sector Combo PRO-04 | Air Transportation Portfolio | Return Before Taxes | Air Transportation Portfolio-Default

Risk/Return:

rr_RiskReturnAbstract

Column

rr_AverageAnnualReturnColumnName

Air Transportation Portfolio

Label

rr_AverageAnnualReturnLabel

Return Before Taxes

Past 1 year

rr_AverageAnnualReturnYear01

20.03%

Past 5 years

rr_AverageAnnualReturnYear05

20.33%

Past 10 years

rr_AverageAnnualReturnYear10

9.83%

02.28 Select Portfolios: Group 6 Industrials Sector Combo PRO-04 | Air Transportation Portfolio | After Taxes on Distributions | Air Transportation Portfolio-Default

Risk/Return:

rr_RiskReturnAbstract

Column

rr_AverageAnnualReturnColumnName

Air Transportation Portfolio

Label

rr_AverageAnnualReturnLabel

Return After Taxes on Distributions

Past 1 year

rr_AverageAnnualReturnYear01

19.84%

Past 5 years

rr_AverageAnnualReturnYear05

19.45%

Past 10 years

rr_AverageAnnualReturnYear10

8.88%

02.28 Select Portfolios: Group 6 Industrials Sector Combo PRO-04 | Air Transportation Portfolio | After Taxes on Distributions and Sales | Air Transportation Portfolio-Default

Risk/Return:

rr_RiskReturnAbstract

Column

rr_AverageAnnualReturnColumnName

Air Transportation Portfolio

Label

rr_AverageAnnualReturnLabel

Return After Taxes on Distributions and Sale of Fund Shares

Past 1 year

rr_AverageAnnualReturnYear01

11.49%

Past 5 years

rr_AverageAnnualReturnYear05

16.48%

Past 10 years

rr_AverageAnnualReturnYear10

7.90%

02.28 Select Portfolios: Group 6 Industrials Sector Combo PRO-04 | Air Transportation Portfolio | S&P 500® Index(reflects no deduction for fees, expenses, or taxes)

Risk/Return:

rr_RiskReturnAbstract

Past 1 year

rr_AverageAnnualReturnYear01

11.96%

Past 5 years

rr_AverageAnnualReturnYear05

14.66%

Past 10 years

rr_AverageAnnualReturnYear10

6.95%

02.28 Select Portfolios: Group 6 Industrials Sector Combo PRO-04 | Air Transportation Portfolio | S&P® Custom Air Transportation Index(reflects no deduction for fees, expenses, or taxes)

Risk/Return:

rr_RiskReturnAbstract

Past 1 year

rr_AverageAnnualReturnYear01

20.12%

Past 5 years

rr_AverageAnnualReturnYear05

20.90%

Past 10 years

rr_AverageAnnualReturnYear10

8.58%

XML

02.28 Select Portfolios: Group 6 Industrials Sector Combo PRO-04 | Defense and Aerospace Portfolio

Fund Summary

Fund:
Defense and Aerospace Portfolio

Investment Objective

The fund seeks capital appreciation.

Fee Table

The following table describes the fees and expenses that may be incurred when you buy and hold shares of the fund.

Shareholder fees

Shareholder Fees {- Defense and Aerospace Portfolio}	02.28 Select Portfolios: Group 6 Industrials Sector Combo PRO-04 Defense and Aerospace Portfolio USD ($)
(fees paid directly from your investment)	none

Annual Operating Expenses

(expenses that you pay each year as a % of the value of your investment)

Annual Operating Expenses {- Defense and Aerospace Portfolio}	02.28 Select Portfolios: Group 6 Industrials Sector Combo PRO-04 Defense and Aerospace Portfolio Defense and Aerospace Portfolio-Default
Management fee	0.55%
Distribution and/or Service (12b-1) fees	none
Other expenses	0.24%
Total annual operating expenses	0.79%

This example helps compare the cost of investing in the fund with the cost of investing in other funds.

Let's say, hypothetically, that the annual return for shares of the fund is 5% and that your shareholder fees and the annual operating expenses for shares of the fund are exactly as described in the fee table. This example illustrates the effect of fees and expenses, but is not meant to suggest actual or expected fees and expenses or returns, all of which may vary. For every $10,000 you invested, here's how much you would pay in total expenses if you sell all of your shares at the end of each time period indicated:

Sell All Shares

Expense Example {- Defense and Aerospace Portfolio}	02.28 Select Portfolios: Group 6 Industrials Sector Combo PRO-04 Defense and Aerospace Portfolio Defense and Aerospace Portfolio-Default USD ($)
1 year	$ 81
3 years	252
5 years	439
10 years	$ 978

Portfolio Turnover

The fund pays transaction costs, such as commissions, when it buys and sells securities (or "turns over" its portfolio). A higher portfolio turnover rate may indicate higher transaction costs and may result in higher taxes when fund shares are held in a taxable account. These costs, which are not reflected in annual operating expenses or in the example, affect the fund's performance. During the most recent fiscal year, the fund's portfolio turnover rate was 24% of the average value of its portfolio.

Principal Investment Strategies

• Normally investing primarily in common stocks.

• Normally investing at least 80% of assets in securities of companies principally engaged in the research, manufacture, or sale of products or services related to the defense or aerospace industries.

• Investing in domestic and foreign issuers.

• Using fundamental analysis of factors such as each issuer's financial condition and industry position, as well as market and economic conditions, to select investments.

Principal Investment Risks

• Stock Market Volatility. Stock markets are volatile and can decline significantly in response to adverse issuer, political, regulatory, market, or economic developments. Different parts of the market, including different market sectors, and different types of securities can react differently to these developments.

• Foreign Exposure. Foreign markets can be more volatile than the U.S. market due to increased risks of adverse issuer, political, regulatory, market, or economic developments and can perform differently from the U.S. market.

• Defense and Aerospace Industry Concentration. The defense and aerospace industry can be significantly affected by government defense and aerospace regulation and spending policies.

• Issuer-Specific Changes. The value of an individual security or particular type of security can be more volatile than, and can perform differently from, the market as a whole. The value of securities of smaller issuers can be more volatile than that of larger issuers.

In addition, the fund is considered non-diversified and can invest a greater portion of assets in securities of a smaller number of individual issuers than a diversified fund. As a result, changes in the market value of a single investment could cause greater fluctuations in share price than would occur in a more diversified fund.

An investment in the fund is not a deposit of a bank and is not insured or guaranteed by the Federal Deposit Insurance Corporation or any other government agency. You could lose money by investing in the fund.

Performance

The following information is intended to help you understand the risks of investing in the fund. The information illustrates the changes in the performance of the fund's shares from year to year and compares the performance of the fund's shares to the performance of a securities market index and an additional index over various periods of time. The indexes have characteristics relevant to the fund's investment strategies. Index descriptions appear in the Additional Index Information section of the prospectus. Past performance (before and after taxes) is not an indication of future performance.

Visit www.fidelity.com for more recent performance information.

Year-by-Year Returns

Calendar Years

During the periods shown in the chart:	Returns	Quarter ended
Highest Quarter Return	20.57%	June 30, 2009
Lowest Quarter Return	-18.55%	December 31, 2008
Year-to-Date Return	5.01%	March 31, 2017

Average Annual Returns

After-tax returns are calculated using the historical highest individual federal marginal income tax rates, but do not reflect the impact of state or local taxes. Actual after-tax returns may differ depending on your individual circumstances. The after-tax returns shown are not relevant if you hold your shares in a retirement account or in another tax-deferred arrangement, such as an employee benefit plan (profit sharing, 401(k), or 403(b) plan).

For the periods ended December 31, 2016

Average Annual Total Returns{- Defense and Aerospace Portfolio} - 02.28 Select Portfolios: Group 6 Industrials Sector Combo PRO-04 - Defense and Aerospace Portfolio	Past 1 year	Past 5 years	Past 10 years
Defense and Aerospace Portfolio-Default | Return Before Taxes	17.89%	16.15%	9.30%
Defense and Aerospace Portfolio-Default | After Taxes on Distributions	16.55%	14.82%	8.36%
Defense and Aerospace Portfolio-Default | After Taxes on Distributions and Sales	11.19%	12.86%	7.49%
S&P 500® Index(reflects no deduction for fees, expenses, or taxes)	11.96%	14.66%	6.95%
MSCI U.S. IMI Aerospace & Defense 25-50 Index(reflects no deduction for fees, expenses, or taxes)	21.95%	20.29%	11.65%

XML

Label

Element

Value

Risk/Return:

rr_RiskReturnAbstract

Registrant Name

dei_EntityRegistrantName

FIDELITY SELECT PORTFOLIOS

Prospectus Date

rr_ProspectusDate

Apr. 29, 2017

02.28 Select Portfolios: Group 6 Industrials Sector Combo PRO-04 | Defense and Aerospace Portfolio

Risk/Return:

rr_RiskReturnAbstract

Risk/Return [Heading]

rr_RiskReturnHeading

Fund Summary

Fund:
Defense and Aerospace Portfolio

Objective [Heading]

rr_ObjectiveHeading

Investment Objective

Objective, Primary [Text Block]

rr_ObjectivePrimaryTextBlock

The fund seeks capital appreciation.

Expense [Heading]

rr_ExpenseHeading

Fee Table

Expense Narrative [Text Block]

rr_ExpenseNarrativeTextBlock

The following table describes the fees and expenses that may be incurred when you buy and hold shares of the fund.

Shareholder Fees Caption [Text]

rr_ShareholderFeesCaption

Shareholder fees

(fees paid directly from your investment)

rr_ShareholderFeeOther

none

Operating Expenses Caption [Text]

rr_OperatingExpensesCaption

Annual Operating Expenses

(expenses that you pay each year as a % of the value of your investment)

Portfolio Turnover [Heading]

rr_PortfolioTurnoverHeading

Portfolio Turnover

Portfolio Turnover [Text Block]

rr_PortfolioTurnoverTextBlock

The fund pays transaction costs, such as commissions, when it buys and sells securities (or "turns over" its portfolio). A higher portfolio turnover rate may indicate higher transaction costs and may result in higher taxes when fund shares are held in a taxable account. These costs, which are not reflected in annual operating expenses or in the example, affect the fund's performance. During the most recent fiscal year, the fund's portfolio turnover rate was 24% of the average value of its portfolio.

Portfolio Turnover, Rate

rr_PortfolioTurnoverRate

24.00%

Expense Example Narrative [Text Block]

rr_ExpenseExampleNarrativeTextBlock

This example helps compare the cost of investing in the fund with the cost of investing in other funds.

Let's say, hypothetically, that the annual return for shares of the fund is 5% and that your shareholder fees and the annual operating expenses for shares of the fund are exactly as described in the fee table. This example illustrates the effect of fees and expenses, but is not meant to suggest actual or expected fees and expenses or returns, all of which may vary. For every $10,000 you invested, here's how much you would pay in total expenses if you sell all of your shares at the end of each time period indicated:

Expense Example by, Year, Caption [Text]

rr_ExpenseExampleByYearCaption

Sell All Shares

Strategy [Heading]

rr_StrategyHeading

Principal Investment Strategies

Strategy Narrative [Text Block]

rr_StrategyNarrativeTextBlock

• Normally investing primarily in common stocks.

• Normally investing at least 80% of assets in securities of companies principally engaged in the research, manufacture, or sale of products or services related to the defense or aerospace industries.

• Investing in domestic and foreign issuers.

• Using fundamental analysis of factors such as each issuer's financial condition and industry position, as well as market and economic conditions, to select investments.

Strategy Portfolio Concentration [Text]

rr_StrategyPortfolioConcentration

Normally investing at least 80% of assets in securities of companies principally engaged in the research, manufacture, or sale of products or services related to the defense or aerospace industries.

Risk [Heading]

rr_RiskHeading

Principal Investment Risks

Risk Narrative [Text Block]

rr_RiskNarrativeTextBlock

• Stock Market Volatility. Stock markets are volatile and can decline significantly in response to adverse issuer, political, regulatory, market, or economic developments. Different parts of the market, including different market sectors, and different types of securities can react differently to these developments.

• Foreign Exposure. Foreign markets can be more volatile than the U.S. market due to increased risks of adverse issuer, political, regulatory, market, or economic developments and can perform differently from the U.S. market.

• Defense and Aerospace Industry Concentration. The defense and aerospace industry can be significantly affected by government defense and aerospace regulation and spending policies.

• Issuer-Specific Changes. The value of an individual security or particular type of security can be more volatile than, and can perform differently from, the market as a whole. The value of securities of smaller issuers can be more volatile than that of larger issuers.

In addition, the fund is considered non-diversified and can invest a greater portion of assets in securities of a smaller number of individual issuers than a diversified fund. As a result, changes in the market value of a single investment could cause greater fluctuations in share price than would occur in a more diversified fund.

An investment in the fund is not a deposit of a bank and is not insured or guaranteed by the Federal Deposit Insurance Corporation or any other government agency. You could lose money by investing in the fund.

Risk Lose Money [Text]

rr_RiskLoseMoney

You could lose money by investing in the fund.

Risk Nondiversified Status [Text]

rr_RiskNondiversifiedStatus

In addition, the fund is considered non-diversified and can invest a greater portion of assets in securities of a smaller number of individual issuers than a diversified fund. As a result, changes in the market value of a single investment could cause greater fluctuations in share price than would occur in a more diversified fund.

Risk Not Insured Depository Institution [Text]

rr_RiskNotInsuredDepositoryInstitution

An investment in the fund is not a deposit of a bank and is not insured or guaranteed by the Federal Deposit Insurance Corporation or any other government agency.

Bar Chart and Performance Table [Heading]

rr_BarChartAndPerformanceTableHeading

Performance

Performance Narrative [Text Block]

rr_PerformanceNarrativeTextBlock

The following information is intended to help you understand the risks of investing in the fund. The information illustrates the changes in the performance of the fund's shares from year to year and compares the performance of the fund's shares to the performance of a securities market index and an additional index over various periods of time. The indexes have characteristics relevant to the fund's investment strategies. Index descriptions appear in the Additional Index Information section of the prospectus. Past performance (before and after taxes) is not an indication of future performance.

Visit www.fidelity.com for more recent performance information.

Performance Information Illustrates Variability of Returns [Text]

rr_PerformanceInformationIllustratesVariabilityOfReturns

The information illustrates the changes in the performance of the fund's shares from year to year and compares the performance of the fund's shares to the performance of a securities market index and an additional index over various periods of time.

Performance Availability Website Address [Text]

rr_PerformanceAvailabilityWebSiteAddress

www.fidelity.com

Performance Past Does Not Indicate Future [Text]

rr_PerformancePastDoesNotIndicateFuture

Past performance (before and after taxes) is not an indication of future performance.

Bar Chart [Heading]

rr_BarChartHeading

Year-by-Year Returns

Calendar Years

Bar Chart Closing [Text Block]

rr_BarChartClosingTextBlock

During the periods shown in the chart:	Returns	Quarter ended
Highest Quarter Return	20.57%	June 30, 2009
Lowest Quarter Return	-18.55%	December 31, 2008
Year-to-Date Return	5.01%	March 31, 2017

Performance Table Heading

rr_PerformanceTableHeading

Average Annual Returns

Performance Table Uses Highest Federal Rate

rr_PerformanceTableUsesHighestFederalRate

After-tax returns are calculated using the historical highest individual federal marginal income tax rates, but do not reflect the impact of state or local taxes.

Performance Table Not Relevant to Tax Deferred

rr_PerformanceTableNotRelevantToTaxDeferred

The after-tax returns shown are not relevant if you hold your shares in a retirement account or in another tax-deferred arrangement, such as an employee benefit plan (profit sharing, 401(k), or 403(b) plan).

Performance Table Narrative

rr_PerformanceTableNarrativeTextBlock

After-tax returns are calculated using the historical highest individual federal marginal income tax rates, but do not reflect the impact of state or local taxes. Actual after-tax returns may differ depending on your individual circumstances. The after-tax returns shown are not relevant if you hold your shares in a retirement account or in another tax-deferred arrangement, such as an employee benefit plan (profit sharing, 401(k), or 403(b) plan).

For the periods ended December 31, 2016

02.28 Select Portfolios: Group 6 Industrials Sector Combo PRO-04 | Defense and Aerospace Portfolio | Defense and Aerospace Portfolio-Default

Risk/Return:

rr_RiskReturnAbstract

Management fee

rr_ManagementFeesOverAssets

0.55%

Distribution and/or Service (12b-1) fees

rr_DistributionAndService12b1FeesOverAssets

none

Other expenses

rr_OtherExpensesOverAssets

0.24%

Total annual operating expenses

rr_ExpensesOverAssets

0.79%

1 year

rr_ExpenseExampleYear01

$ 81

3 years

rr_ExpenseExampleYear03

252

5 years

rr_ExpenseExampleYear05

439

10 years

rr_ExpenseExampleYear10

$ 978

2007

rr_AnnualReturn2007

17.81%

2008

rr_AnnualReturn2008

(40.17%)

2009

rr_AnnualReturn2009

24.87%

2010

rr_AnnualReturn2010

21.88%

2011

rr_AnnualReturn2011

7.33%

2012

rr_AnnualReturn2012

13.51%

2013

rr_AnnualReturn2013

48.14%

2014

rr_AnnualReturn2014

2.92%

2015

rr_AnnualReturn2015

3.60%

2016

rr_AnnualReturn2016

17.89%

Year to Date Return, Label

rr_YearToDateReturnLabel

Year-to-Date Return

Bar Chart, Year to Date Return, Date

rr_BarChartYearToDateReturnDate

Mar. 31, 2017

Bar Chart, Year to Date Return

rr_BarChartYearToDateReturn

5.01%

Highest Quarterly Return, Label

rr_HighestQuarterlyReturnLabel

Highest Quarter Return

Highest Quarterly Return, Date

rr_BarChartHighestQuarterlyReturnDate

Jun. 30, 2009

Highest Quarterly Return

rr_BarChartHighestQuarterlyReturn

20.57%

Lowest Quarterly Return, Label

rr_LowestQuarterlyReturnLabel

Lowest Quarter Return

Lowest Quarterly Return, Date

rr_BarChartLowestQuarterlyReturnDate

Dec. 31, 2008

Lowest Quarterly Return

rr_BarChartLowestQuarterlyReturn

(18.55%)

02.28 Select Portfolios: Group 6 Industrials Sector Combo PRO-04 | Defense and Aerospace Portfolio | Return Before Taxes | Defense and Aerospace Portfolio-Default

Risk/Return:

rr_RiskReturnAbstract

Column

rr_AverageAnnualReturnColumnName

Defense and Aerospace Portfolio

Label

rr_AverageAnnualReturnLabel

Return Before Taxes

Past 1 year

rr_AverageAnnualReturnYear01

17.89%

Past 5 years

rr_AverageAnnualReturnYear05

16.15%

Past 10 years

rr_AverageAnnualReturnYear10

9.30%

02.28 Select Portfolios: Group 6 Industrials Sector Combo PRO-04 | Defense and Aerospace Portfolio | After Taxes on Distributions | Defense and Aerospace Portfolio-Default

Risk/Return:

rr_RiskReturnAbstract

Column

rr_AverageAnnualReturnColumnName

Defense and Aerospace Portfolio

Label

rr_AverageAnnualReturnLabel

Return After Taxes on Distributions

Past 1 year

rr_AverageAnnualReturnYear01

16.55%

Past 5 years

rr_AverageAnnualReturnYear05

14.82%

Past 10 years

rr_AverageAnnualReturnYear10

8.36%

02.28 Select Portfolios: Group 6 Industrials Sector Combo PRO-04 | Defense and Aerospace Portfolio | After Taxes on Distributions and Sales | Defense and Aerospace Portfolio-Default

Risk/Return:

rr_RiskReturnAbstract

Column

rr_AverageAnnualReturnColumnName

Defense and Aerospace Portfolio

Label

rr_AverageAnnualReturnLabel

Return After Taxes on Distributions and Sale of Fund Shares

Past 1 year

rr_AverageAnnualReturnYear01

11.19%

Past 5 years

rr_AverageAnnualReturnYear05

12.86%

Past 10 years

rr_AverageAnnualReturnYear10

7.49%

02.28 Select Portfolios: Group 6 Industrials Sector Combo PRO-04 | Defense and Aerospace Portfolio | S&P 500® Index(reflects no deduction for fees, expenses, or taxes)

Risk/Return:

rr_RiskReturnAbstract

Past 1 year

rr_AverageAnnualReturnYear01

11.96%

Past 5 years

rr_AverageAnnualReturnYear05

14.66%

Past 10 years

rr_AverageAnnualReturnYear10

6.95%

02.28 Select Portfolios: Group 6 Industrials Sector Combo PRO-04 | Defense and Aerospace Portfolio | MSCI U.S. IMI Aerospace & Defense 25-50 Index(reflects no deduction for fees, expenses, or taxes)

Risk/Return:

rr_RiskReturnAbstract

Past 1 year

rr_AverageAnnualReturnYear01

21.95%

Past 5 years

rr_AverageAnnualReturnYear05

20.29%

Past 10 years

rr_AverageAnnualReturnYear10

11.65%

XML

02.28 Select Portfolios: Group 6 Industrials Sector Combo PRO-04 | Environment and Alternative Energy Portfolio

Fund Summary

Fund:
Environment and Alternative Energy Portfolio

Investment Objective

The fund seeks capital appreciation.

Fee Table

The following table describes the fees and expenses that may be incurred when you buy and hold shares of the fund.

Shareholder fees

(fees paid directly from your investment)

Shareholder Fees {- Environment and Alternative Energy Portfolio}	02.28 Select Portfolios: Group 6 Industrials Sector Combo PRO-04 Environment and Alternative Energy Portfolio Environment and Alternative Energy Portfolio-Default
Redemption fee on shares held less than 30 days (as a % of amount redeemed)	0.75%

Annual Operating Expenses

(expenses that you pay each year as a % of the value of your investment)

Annual Operating Expenses {- Environment and Alternative Energy Portfolio}	02.28 Select Portfolios: Group 6 Industrials Sector Combo PRO-04 Environment and Alternative Energy Portfolio Environment and Alternative Energy Portfolio-Default
Management fee	0.55%
Distribution and/or Service (12b-1) fees	none
Other expenses	0.39%
Total annual operating expenses	0.94%

This example helps compare the cost of investing in the fund with the cost of investing in other funds.

Let's say, hypothetically, that the annual return for shares of the fund is 5% and that your shareholder fees and the annual operating expenses for shares of the fund are exactly as described in the fee table. This example illustrates the effect of fees and expenses, but is not meant to suggest actual or expected fees and expenses or returns, all of which may vary. For every $10,000 you invested, here's how much you would pay in total expenses if you sell all of your shares at the end of each time period indicated:

Sell All Shares

Expense Example {- Environment and Alternative Energy Portfolio}	02.28 Select Portfolios: Group 6 Industrials Sector Combo PRO-04 Environment and Alternative Energy Portfolio Environment and Alternative Energy Portfolio-Default USD ($)
1 year	$ 96
3 years	300
5 years	520
10 years	$ 1,155

Portfolio Turnover

The fund pays transaction costs, such as commissions, when it buys and sells securities (or "turns over" its portfolio). A higher portfolio turnover rate may indicate higher transaction costs and may result in higher taxes when fund shares are held in a taxable account. These costs, which are not reflected in annual operating expenses or in the example, affect the fund's performance. During the most recent fiscal year, the fund's portfolio turnover rate was 82% of the average value of its portfolio.

Principal Investment Strategies

• Normally investing primarily in common stocks.

• Normally investing at least 80% of assets in securities of companies principally engaged in business activities related to alternative and renewable energy, energy efficiency, pollution control, water infrastructure, waste and recycling technologies, or other environmental support services.

• Investing in domestic and foreign issuers.

• Using fundamental analysis of factors such as each issuer's financial condition and industry position, as well as market and economic conditions, to select investments.

Principal Investment Risks

• Stock Market Volatility. Stock markets are volatile and can decline significantly in response to adverse issuer, political, regulatory, market, or economic developments. Different parts of the market, including different market sectors, and different types of securities can react differently to these developments.

• Foreign Exposure. Foreign markets can be more volatile than the U.S. market due to increased risks of adverse issuer, political, regulatory, market, or economic developments and can perform differently from the U.S. market.

• Environment and Alternative Energy Industry Concentration. The environment and alternative energy industries can be significantly affected by government regulations and subsidies, changing supply and demand for traditional energy sources, and availability of funding for remedial cleanup or development of new technologies, and can be subject to risks associated with hazardous materials.

• Issuer-Specific Changes. The value of an individual security or particular type of security can be more volatile than, and can perform differently from, the market as a whole. The value of securities of smaller issuers can be more volatile than that of larger issuers.

In addition, the fund is considered non-diversified and can invest a greater portion of assets in securities of a smaller number of individual issuers than a diversified fund. As a result, changes in the market value of a single investment could cause greater fluctuations in share price than would occur in a more diversified fund.

An investment in the fund is not a deposit of a bank and is not insured or guaranteed by the Federal Deposit Insurance Corporation or any other government agency. You could lose money by investing in the fund.

Performance

The following information is intended to help you understand the risks of investing in the fund. The information illustrates the changes in the performance of the fund's shares from year to year and compares the performance of the fund's shares to the performance of a securities market index and an additional index over various periods of time. The indexes have characteristics relevant to the fund's investment strategies. Index descriptions appear in the Additional Index Information section of the prospectus. Prior to July 1, 2010, the fund was named Environmental Portfolio, and the fund operated under certain different investment policies and compared its performance to a different additional index. The fund's historical performance may not represent its current investment policies. Past performance (before and after taxes) is not an indication of future performance.

Visit www.fidelity.com for more recent performance information.

Year-by-Year Returns

Calendar Years

During the periods shown in the chart:	Returns	Quarter ended
Highest Quarter Return	22.39%	June 30, 2009
Lowest Quarter Return	-25.92%	September 30, 2011
Year-to-Date Return	7.49%	March 31, 2017

Average Annual Returns

After-tax returns are calculated using the historical highest individual federal marginal income tax rates, but do not reflect the impact of state or local taxes. Actual after-tax returns may differ depending on your individual circumstances. The after-tax returns shown are not relevant if you hold your shares in a retirement account or in another tax-deferred arrangement, such as an employee benefit plan (profit sharing, 401(k), or 403(b) plan).

For the periods ended December 31, 2016

Average Annual Total Returns{- Environment and Alternative Energy Portfolio} - 02.28 Select Portfolios: Group 6 Industrials Sector Combo PRO-04 - Environment and Alternative Energy Portfolio	Past 1 year	Past 5 years	Past 10 years
Environment and Alternative Energy Portfolio-Default | Return Before Taxes	20.72%	12.57%	5.02%
Environment and Alternative Energy Portfolio-Default | After Taxes on Distributions	20.34%	11.62%	4.51%
Environment and Alternative Energy Portfolio-Default | After Taxes on Distributions and Sales	12.02%	9.98%	3.96%
S&P 500® Index(reflects no deduction for fees, expenses, or taxes)	11.96%	14.66%	6.95%
FTSE® Environmental Opportunities & Alternative Energy Index(reflects no deduction for fees, expenses, or taxes)	15.21%	13.27%	3.29%

XML

Label

Element

Value

Risk/Return:

rr_RiskReturnAbstract

Registrant Name

dei_EntityRegistrantName

FIDELITY SELECT PORTFOLIOS

Prospectus Date

rr_ProspectusDate

Apr. 29, 2017

02.28 Select Portfolios: Group 6 Industrials Sector Combo PRO-04 | Environment and Alternative Energy Portfolio

Risk/Return:

rr_RiskReturnAbstract

Risk/Return [Heading]

rr_RiskReturnHeading

Fund Summary

Fund:
Environment and Alternative Energy Portfolio

Objective [Heading]

rr_ObjectiveHeading

Investment Objective

Objective, Primary [Text Block]

rr_ObjectivePrimaryTextBlock

The fund seeks capital appreciation.

Expense [Heading]

rr_ExpenseHeading

Fee Table

Expense Narrative [Text Block]

rr_ExpenseNarrativeTextBlock

The following table describes the fees and expenses that may be incurred when you buy and hold shares of the fund.

Shareholder Fees Caption [Text]

rr_ShareholderFeesCaption

Shareholder fees

(fees paid directly from your investment)

Operating Expenses Caption [Text]

rr_OperatingExpensesCaption

Annual Operating Expenses

(expenses that you pay each year as a % of the value of your investment)

Portfolio Turnover [Heading]

rr_PortfolioTurnoverHeading

Portfolio Turnover

Portfolio Turnover [Text Block]

rr_PortfolioTurnoverTextBlock

The fund pays transaction costs, such as commissions, when it buys and sells securities (or "turns over" its portfolio). A higher portfolio turnover rate may indicate higher transaction costs and may result in higher taxes when fund shares are held in a taxable account. These costs, which are not reflected in annual operating expenses or in the example, affect the fund's performance. During the most recent fiscal year, the fund's portfolio turnover rate was 82% of the average value of its portfolio.

Portfolio Turnover, Rate

rr_PortfolioTurnoverRate

82.00%

Expense Example Narrative [Text Block]

rr_ExpenseExampleNarrativeTextBlock

This example helps compare the cost of investing in the fund with the cost of investing in other funds.

Let's say, hypothetically, that the annual return for shares of the fund is 5% and that your shareholder fees and the annual operating expenses for shares of the fund are exactly as described in the fee table. This example illustrates the effect of fees and expenses, but is not meant to suggest actual or expected fees and expenses or returns, all of which may vary. For every $10,000 you invested, here's how much you would pay in total expenses if you sell all of your shares at the end of each time period indicated:

Expense Example by, Year, Caption [Text]

rr_ExpenseExampleByYearCaption

Sell All Shares

Strategy [Heading]

rr_StrategyHeading

Principal Investment Strategies

Strategy Narrative [Text Block]

rr_StrategyNarrativeTextBlock

• Normally investing primarily in common stocks.

• Normally investing at least 80% of assets in securities of companies principally engaged in business activities related to alternative and renewable energy, energy efficiency, pollution control, water infrastructure, waste and recycling technologies, or other environmental support services.

• Investing in domestic and foreign issuers.

• Using fundamental analysis of factors such as each issuer's financial condition and industry position, as well as market and economic conditions, to select investments.

Strategy Portfolio Concentration [Text]

rr_StrategyPortfolioConcentration

Normally investing at least 80% of assets in securities of companies principally engaged in business activities related to alternative and renewable energy, energy efficiency, pollution control, water infrastructure, waste and recycling technologies, or other environmental support services.

Risk [Heading]

rr_RiskHeading

Principal Investment Risks

Risk Narrative [Text Block]

rr_RiskNarrativeTextBlock

• Stock Market Volatility. Stock markets are volatile and can decline significantly in response to adverse issuer, political, regulatory, market, or economic developments. Different parts of the market, including different market sectors, and different types of securities can react differently to these developments.

• Foreign Exposure. Foreign markets can be more volatile than the U.S. market due to increased risks of adverse issuer, political, regulatory, market, or economic developments and can perform differently from the U.S. market.

• Environment and Alternative Energy Industry Concentration. The environment and alternative energy industries can be significantly affected by government regulations and subsidies, changing supply and demand for traditional energy sources, and availability of funding for remedial cleanup or development of new technologies, and can be subject to risks associated with hazardous materials.

• Issuer-Specific Changes. The value of an individual security or particular type of security can be more volatile than, and can perform differently from, the market as a whole. The value of securities of smaller issuers can be more volatile than that of larger issuers.

In addition, the fund is considered non-diversified and can invest a greater portion of assets in securities of a smaller number of individual issuers than a diversified fund. As a result, changes in the market value of a single investment could cause greater fluctuations in share price than would occur in a more diversified fund.

An investment in the fund is not a deposit of a bank and is not insured or guaranteed by the Federal Deposit Insurance Corporation or any other government agency. You could lose money by investing in the fund.

Risk Lose Money [Text]

rr_RiskLoseMoney

You could lose money by investing in the fund.

Risk Nondiversified Status [Text]

rr_RiskNondiversifiedStatus

In addition, the fund is considered non-diversified and can invest a greater portion of assets in securities of a smaller number of individual issuers than a diversified fund. As a result, changes in the market value of a single investment could cause greater fluctuations in share price than would occur in a more diversified fund.

Risk Not Insured Depository Institution [Text]

rr_RiskNotInsuredDepositoryInstitution

An investment in the fund is not a deposit of a bank and is not insured or guaranteed by the Federal Deposit Insurance Corporation or any other government agency.

Bar Chart and Performance Table [Heading]

rr_BarChartAndPerformanceTableHeading

Performance

Performance Narrative [Text Block]

rr_PerformanceNarrativeTextBlock

The following information is intended to help you understand the risks of investing in the fund. The information illustrates the changes in the performance of the fund's shares from year to year and compares the performance of the fund's shares to the performance of a securities market index and an additional index over various periods of time. The indexes have characteristics relevant to the fund's investment strategies. Index descriptions appear in the Additional Index Information section of the prospectus. Prior to July 1, 2010, the fund was named Environmental Portfolio, and the fund operated under certain different investment policies and compared its performance to a different additional index. The fund's historical performance may not represent its current investment policies. Past performance (before and after taxes) is not an indication of future performance.

Visit www.fidelity.com for more recent performance information.

Performance Information Illustrates Variability of Returns [Text]

rr_PerformanceInformationIllustratesVariabilityOfReturns

The information illustrates the changes in the performance of the fund's shares from year to year and compares the performance of the fund's shares to the performance of a securities market index and an additional index over various periods of time.

Performance Availability Website Address [Text]

rr_PerformanceAvailabilityWebSiteAddress

www.fidelity.com

Performance Past Does Not Indicate Future [Text]

rr_PerformancePastDoesNotIndicateFuture

Past performance (before and after taxes) is not an indication of future performance.

Bar Chart [Heading]

rr_BarChartHeading

Year-by-Year Returns

Calendar Years

Bar Chart Closing [Text Block]

rr_BarChartClosingTextBlock

During the periods shown in the chart:	Returns	Quarter ended
Highest Quarter Return	22.39%	June 30, 2009
Lowest Quarter Return	-25.92%	September 30, 2011
Year-to-Date Return	7.49%	March 31, 2017

Performance Table Heading

rr_PerformanceTableHeading

Average Annual Returns

Performance Table Uses Highest Federal Rate

rr_PerformanceTableUsesHighestFederalRate

After-tax returns are calculated using the historical highest individual federal marginal income tax rates, but do not reflect the impact of state or local taxes.

Performance Table Not Relevant to Tax Deferred

rr_PerformanceTableNotRelevantToTaxDeferred

The after-tax returns shown are not relevant if you hold your shares in a retirement account or in another tax-deferred arrangement, such as an employee benefit plan (profit sharing, 401(k), or 403(b) plan).

Performance Table Narrative

rr_PerformanceTableNarrativeTextBlock

After-tax returns are calculated using the historical highest individual federal marginal income tax rates, but do not reflect the impact of state or local taxes. Actual after-tax returns may differ depending on your individual circumstances. The after-tax returns shown are not relevant if you hold your shares in a retirement account or in another tax-deferred arrangement, such as an employee benefit plan (profit sharing, 401(k), or 403(b) plan).

For the periods ended December 31, 2016

02.28 Select Portfolios: Group 6 Industrials Sector Combo PRO-04 | Environment and Alternative Energy Portfolio | Environment and Alternative Energy Portfolio-Default

Risk/Return:

rr_RiskReturnAbstract

Redemption fee on shares held less than 30 days (as a % of amount redeemed)

rr_RedemptionFeeOverRedemption

0.75%

Management fee

rr_ManagementFeesOverAssets

0.55%

Distribution and/or Service (12b-1) fees

rr_DistributionAndService12b1FeesOverAssets

none

Other expenses

rr_OtherExpensesOverAssets

0.39%

Total annual operating expenses

rr_ExpensesOverAssets

0.94%

1 year

rr_ExpenseExampleYear01

$ 96

3 years

rr_ExpenseExampleYear03

300

5 years

rr_ExpenseExampleYear05

520

10 years

rr_ExpenseExampleYear10

$ 1,155

2007

rr_AnnualReturn2007

12.44%

2008

rr_AnnualReturn2008

(30.45%)

2009

rr_AnnualReturn2009

17.16%

2010

rr_AnnualReturn2010

14.93%

2011

rr_AnnualReturn2011

(14.30%)

2012

rr_AnnualReturn2012

14.15%

2013

rr_AnnualReturn2013

34.99%

2014

rr_AnnualReturn2014

1.86%

2015

rr_AnnualReturn2015

(4.59%)

2016

rr_AnnualReturn2016

20.72%

Year to Date Return, Label

rr_YearToDateReturnLabel

Year-to-Date Return

Bar Chart, Year to Date Return, Date

rr_BarChartYearToDateReturnDate

Mar. 31, 2017

Bar Chart, Year to Date Return

rr_BarChartYearToDateReturn

7.49%

Highest Quarterly Return, Label

rr_HighestQuarterlyReturnLabel

Highest Quarter Return

Highest Quarterly Return, Date

rr_BarChartHighestQuarterlyReturnDate

Jun. 30, 2009

Highest Quarterly Return

rr_BarChartHighestQuarterlyReturn

22.39%

Lowest Quarterly Return, Label

rr_LowestQuarterlyReturnLabel

Lowest Quarter Return

Lowest Quarterly Return, Date

rr_BarChartLowestQuarterlyReturnDate

Sep. 30, 2011

Lowest Quarterly Return

rr_BarChartLowestQuarterlyReturn

(25.92%)

02.28 Select Portfolios: Group 6 Industrials Sector Combo PRO-04 | Environment and Alternative Energy Portfolio | Return Before Taxes | Environment and Alternative Energy Portfolio-Default

Risk/Return:

rr_RiskReturnAbstract

Column

rr_AverageAnnualReturnColumnName

Environment and Alternative Energy Portfolio

Label

rr_AverageAnnualReturnLabel

Return Before Taxes

Past 1 year

rr_AverageAnnualReturnYear01

20.72%

Past 5 years

rr_AverageAnnualReturnYear05

12.57%

Past 10 years

rr_AverageAnnualReturnYear10

5.02%

02.28 Select Portfolios: Group 6 Industrials Sector Combo PRO-04 | Environment and Alternative Energy Portfolio | After Taxes on Distributions | Environment and Alternative Energy Portfolio-Default

Risk/Return:

rr_RiskReturnAbstract

Column

rr_AverageAnnualReturnColumnName

Environment and Alternative Energy Portfolio

Label

rr_AverageAnnualReturnLabel

Return After Taxes on Distributions

Past 1 year

rr_AverageAnnualReturnYear01

20.34%

Past 5 years

rr_AverageAnnualReturnYear05

11.62%

Past 10 years

rr_AverageAnnualReturnYear10

4.51%

02.28 Select Portfolios: Group 6 Industrials Sector Combo PRO-04 | Environment and Alternative Energy Portfolio | After Taxes on Distributions and Sales | Environment and Alternative Energy Portfolio-Default

Risk/Return:

rr_RiskReturnAbstract

Column

rr_AverageAnnualReturnColumnName

Environment and Alternative Energy Portfolio

Label

rr_AverageAnnualReturnLabel

Return After Taxes on Distributions and Sale of Fund Shares

Past 1 year

rr_AverageAnnualReturnYear01

12.02%

Past 5 years

rr_AverageAnnualReturnYear05

9.98%

Past 10 years

rr_AverageAnnualReturnYear10

3.96%

02.28 Select Portfolios: Group 6 Industrials Sector Combo PRO-04 | Environment and Alternative Energy Portfolio | S&P 500® Index(reflects no deduction for fees, expenses, or taxes)

Risk/Return:

rr_RiskReturnAbstract

Past 1 year

rr_AverageAnnualReturnYear01

11.96%

Past 5 years

rr_AverageAnnualReturnYear05

14.66%

Past 10 years

rr_AverageAnnualReturnYear10

6.95%

02.28 Select Portfolios: Group 6 Industrials Sector Combo PRO-04 | Environment and Alternative Energy Portfolio | FTSE® Environmental Opportunities & Alternative Energy Index(reflects no deduction for fees, expenses, or taxes)

Risk/Return:

rr_RiskReturnAbstract

Past 1 year

rr_AverageAnnualReturnYear01

15.21%

Past 5 years

rr_AverageAnnualReturnYear05

13.27%

Past 10 years

rr_AverageAnnualReturnYear10

3.29%

XML

02.28 Select Portfolios: Group 6 Industrials Sector Combo PRO-04 | Industrial Equipment Portfolio

Fund Summary

Fund:
Industrial Equipment Portfolio

Investment Objective

The fund seeks capital appreciation.

Fee Table

The following table describes the fees and expenses that may be incurred when you buy and hold shares of the fund.

Shareholder fees

(fees paid directly from your investment)

Shareholder Fees {- Industrial Equipment Portfolio}	02.28 Select Portfolios: Group 6 Industrials Sector Combo PRO-04 Industrial Equipment Portfolio Industrial Equipment Portfolio-Default
Redemption fee on shares held less than 30 days (as a % of amount redeemed)	0.75%

Annual Operating Expenses

(expenses that you pay each year as a % of the value of your investment)

Annual Operating Expenses {- Industrial Equipment Portfolio}	02.28 Select Portfolios: Group 6 Industrials Sector Combo PRO-04 Industrial Equipment Portfolio Industrial Equipment Portfolio-Default
Management fee	0.55%
Distribution and/or Service (12b-1) fees	none
Other expenses	0.28%
Total annual operating expenses	0.83%

This example helps compare the cost of investing in the fund with the cost of investing in other funds.

Let's say, hypothetically, that the annual return for shares of the fund is 5% and that your shareholder fees and the annual operating expenses for shares of the fund are exactly as described in the fee table. This example illustrates the effect of fees and expenses, but is not meant to suggest actual or expected fees and expenses or returns, all of which may vary. For every $10,000 you invested, here's how much you would pay in total expenses if you sell all of your shares at the end of each time period indicated:

Sell All Shares

Expense Example {- Industrial Equipment Portfolio}	02.28 Select Portfolios: Group 6 Industrials Sector Combo PRO-04 Industrial Equipment Portfolio Industrial Equipment Portfolio-Default USD ($)
1 year	$ 85
3 years	265
5 years	460
10 years	$ 1,025

Portfolio Turnover

The fund pays transaction costs, such as commissions, when it buys and sells securities (or "turns over" its portfolio). A higher portfolio turnover rate may indicate higher transaction costs and may result in higher taxes when fund shares are held in a taxable account. These costs, which are not reflected in annual operating expenses or in the example, affect the fund's performance. During the most recent fiscal year, the fund's portfolio turnover rate was 166% of the average value of its portfolio.

Principal Investment Strategies

• Normally investing primarily in common stocks.

• Normally investing at least 80% of assets in securities of companies principally engaged in the manufacture, distribution, or service of products and equipment for the industrial sector, including integrated producers of capital equipment, parts suppliers, and subcontractors.

• Investing in domestic and foreign issuers.

• Using fundamental analysis of factors such as each issuer's financial condition and industry position, as well as market and economic conditions, to select investments.

Principal Investment Risks

• Stock Market Volatility. Stock markets are volatile and can decline significantly in response to adverse issuer, political, regulatory, market, or economic developments. Different parts of the market, including different market sectors, and different types of securities can react differently to these developments.

• Foreign Exposure. Foreign markets can be more volatile than the U.S. market due to increased risks of adverse issuer, political, regulatory, market, or economic developments and can perform differently from the U.S. market.

• Industrial Equipment Industry Concentration. The industrial equipment industry can be significantly affected by overall capital spending levels, economic cycles, technical obsolescence, labor relations, and government regulations.

• Issuer-Specific Changes. The value of an individual security or particular type of security can be more volatile than, and can perform differently from, the market as a whole. The value of securities of smaller issuers can be more volatile than that of larger issuers.

In addition, the fund is considered non-diversified and can invest a greater portion of assets in securities of a smaller number of individual issuers than a diversified fund. As a result, changes in the market value of a single investment could cause greater fluctuations in share price than would occur in a more diversified fund.

An investment in the fund is not a deposit of a bank and is not insured or guaranteed by the Federal Deposit Insurance Corporation or any other government agency. You could lose money by investing in the fund.

Performance

The following information is intended to help you understand the risks of investing in the fund. The information illustrates the changes in the performance of the fund's shares from year to year and compares the performance of the fund's shares to the performance of a securities market index and an additional index over various periods of time. The indexes have characteristics relevant to the fund's investment strategies. Index descriptions appear in the Additional Index Information section of the prospectus. Past performance (before and after taxes) is not an indication of future performance.

Visit www.fidelity.com for more recent performance information.

Year-by-Year Returns

Calendar Years

During the periods shown in the chart:	Returns	Quarter ended
Highest Quarter Return	24.86%	June 30, 2009
Lowest Quarter Return	-28.55%	December 31, 2008
Year-to-Date Return	3.35%	March 31, 2017

Average Annual Returns

After-tax returns are calculated using the historical highest individual federal marginal income tax rates, but do not reflect the impact of state or local taxes. Actual after-tax returns may differ depending on your individual circumstances. The after-tax returns shown are not relevant if you hold your shares in a retirement account or in another tax-deferred arrangement, such as an employee benefit plan (profit sharing, 401(k), or 403(b) plan).

For the periods ended December 31, 2016

Average Annual Total Returns{- Industrial Equipment Portfolio} - 02.28 Select Portfolios: Group 6 Industrials Sector Combo PRO-04 - Industrial Equipment Portfolio	Past 1 year	Past 5 years	Past 10 years
Industrial Equipment Portfolio-Default | Return Before Taxes	12.73%	13.20%	7.66%
Industrial Equipment Portfolio-Default | After Taxes on Distributions	11.42%	11.13%	6.49%
Industrial Equipment Portfolio-Default | After Taxes on Distributions and Sales	8.29%	10.30%	6.09%
S&P 500® Index(reflects no deduction for fees, expenses, or taxes)	11.96%	14.66%	6.95%
MSCI U.S. IMI Capital Goods 25-50 Index(reflects no deduction for fees, expenses, or taxes)	19.90%	15.85%	7.87%

XML

Label

Element

Value

Risk/Return:

rr_RiskReturnAbstract

Registrant Name

dei_EntityRegistrantName

FIDELITY SELECT PORTFOLIOS

Prospectus Date

rr_ProspectusDate

Apr. 29, 2017

02.28 Select Portfolios: Group 6 Industrials Sector Combo PRO-04 | Industrial Equipment Portfolio

Risk/Return:

rr_RiskReturnAbstract

Risk/Return [Heading]

rr_RiskReturnHeading

Fund Summary

Fund:
Industrial Equipment Portfolio

Objective [Heading]

rr_ObjectiveHeading

Investment Objective

Objective, Primary [Text Block]

rr_ObjectivePrimaryTextBlock

The fund seeks capital appreciation.

Expense [Heading]

rr_ExpenseHeading

Fee Table

Expense Narrative [Text Block]

rr_ExpenseNarrativeTextBlock

The following table describes the fees and expenses that may be incurred when you buy and hold shares of the fund.

Shareholder Fees Caption [Text]

rr_ShareholderFeesCaption

Shareholder fees

(fees paid directly from your investment)

Operating Expenses Caption [Text]

rr_OperatingExpensesCaption

Annual Operating Expenses

(expenses that you pay each year as a % of the value of your investment)

Portfolio Turnover [Heading]

rr_PortfolioTurnoverHeading

Portfolio Turnover

Portfolio Turnover [Text Block]

rr_PortfolioTurnoverTextBlock

The fund pays transaction costs, such as commissions, when it buys and sells securities (or "turns over" its portfolio). A higher portfolio turnover rate may indicate higher transaction costs and may result in higher taxes when fund shares are held in a taxable account. These costs, which are not reflected in annual operating expenses or in the example, affect the fund's performance. During the most recent fiscal year, the fund's portfolio turnover rate was 166% of the average value of its portfolio.

Portfolio Turnover, Rate

rr_PortfolioTurnoverRate

166.00%

Expense Example Narrative [Text Block]

rr_ExpenseExampleNarrativeTextBlock

This example helps compare the cost of investing in the fund with the cost of investing in other funds.

Let's say, hypothetically, that the annual return for shares of the fund is 5% and that your shareholder fees and the annual operating expenses for shares of the fund are exactly as described in the fee table. This example illustrates the effect of fees and expenses, but is not meant to suggest actual or expected fees and expenses or returns, all of which may vary. For every $10,000 you invested, here's how much you would pay in total expenses if you sell all of your shares at the end of each time period indicated:

Expense Example by, Year, Caption [Text]

rr_ExpenseExampleByYearCaption

Sell All Shares

Strategy [Heading]

rr_StrategyHeading

Principal Investment Strategies

Strategy Narrative [Text Block]

rr_StrategyNarrativeTextBlock

• Normally investing primarily in common stocks.

• Normally investing at least 80% of assets in securities of companies principally engaged in the manufacture, distribution, or service of products and equipment for the industrial sector, including integrated producers of capital equipment, parts suppliers, and subcontractors.

• Investing in domestic and foreign issuers.

• Using fundamental analysis of factors such as each issuer's financial condition and industry position, as well as market and economic conditions, to select investments.

Strategy Portfolio Concentration [Text]

rr_StrategyPortfolioConcentration

Normally investing at least 80% of assets in securities of companies principally engaged in the manufacture, distribution, or service of products and equipment for the industrial sector, including integrated producers of capital equipment, parts suppliers, and subcontractors.

Risk [Heading]

rr_RiskHeading

Principal Investment Risks

Risk Narrative [Text Block]

rr_RiskNarrativeTextBlock

• Stock Market Volatility. Stock markets are volatile and can decline significantly in response to adverse issuer, political, regulatory, market, or economic developments. Different parts of the market, including different market sectors, and different types of securities can react differently to these developments.

• Foreign Exposure. Foreign markets can be more volatile than the U.S. market due to increased risks of adverse issuer, political, regulatory, market, or economic developments and can perform differently from the U.S. market.

• Industrial Equipment Industry Concentration. The industrial equipment industry can be significantly affected by overall capital spending levels, economic cycles, technical obsolescence, labor relations, and government regulations.

• Issuer-Specific Changes. The value of an individual security or particular type of security can be more volatile than, and can perform differently from, the market as a whole. The value of securities of smaller issuers can be more volatile than that of larger issuers.

In addition, the fund is considered non-diversified and can invest a greater portion of assets in securities of a smaller number of individual issuers than a diversified fund. As a result, changes in the market value of a single investment could cause greater fluctuations in share price than would occur in a more diversified fund.

An investment in the fund is not a deposit of a bank and is not insured or guaranteed by the Federal Deposit Insurance Corporation or any other government agency. You could lose money by investing in the fund.

Risk Lose Money [Text]

rr_RiskLoseMoney

You could lose money by investing in the fund.

Risk Nondiversified Status [Text]

rr_RiskNondiversifiedStatus

In addition, the fund is considered non-diversified and can invest a greater portion of assets in securities of a smaller number of individual issuers than a diversified fund. As a result, changes in the market value of a single investment could cause greater fluctuations in share price than would occur in a more diversified fund.

Risk Not Insured Depository Institution [Text]

rr_RiskNotInsuredDepositoryInstitution

An investment in the fund is not a deposit of a bank and is not insured or guaranteed by the Federal Deposit Insurance Corporation or any other government agency.

Bar Chart and Performance Table [Heading]

rr_BarChartAndPerformanceTableHeading

Performance

Performance Narrative [Text Block]

rr_PerformanceNarrativeTextBlock

The following information is intended to help you understand the risks of investing in the fund. The information illustrates the changes in the performance of the fund's shares from year to year and compares the performance of the fund's shares to the performance of a securities market index and an additional index over various periods of time. The indexes have characteristics relevant to the fund's investment strategies. Index descriptions appear in the Additional Index Information section of the prospectus. Past performance (before and after taxes) is not an indication of future performance.

Visit www.fidelity.com for more recent performance information.

Performance Information Illustrates Variability of Returns [Text]

rr_PerformanceInformationIllustratesVariabilityOfReturns

The information illustrates the changes in the performance of the fund's shares from year to year and compares the performance of the fund's shares to the performance of a securities market index and an additional index over various periods of time.

Performance Availability Website Address [Text]

rr_PerformanceAvailabilityWebSiteAddress

www.fidelity.com

Performance Past Does Not Indicate Future [Text]

rr_PerformancePastDoesNotIndicateFuture

Past performance (before and after taxes) is not an indication of future performance.

Bar Chart [Heading]

rr_BarChartHeading

Year-by-Year Returns

Calendar Years

Bar Chart Closing [Text Block]

rr_BarChartClosingTextBlock

During the periods shown in the chart:	Returns	Quarter ended
Highest Quarter Return	24.86%	June 30, 2009
Lowest Quarter Return	-28.55%	December 31, 2008
Year-to-Date Return	3.35%	March 31, 2017

Performance Table Heading

rr_PerformanceTableHeading

Average Annual Returns

Performance Table Uses Highest Federal Rate

rr_PerformanceTableUsesHighestFederalRate

After-tax returns are calculated using the historical highest individual federal marginal income tax rates, but do not reflect the impact of state or local taxes.

Performance Table Not Relevant to Tax Deferred

rr_PerformanceTableNotRelevantToTaxDeferred

The after-tax returns shown are not relevant if you hold your shares in a retirement account or in another tax-deferred arrangement, such as an employee benefit plan (profit sharing, 401(k), or 403(b) plan).

Performance Table Narrative

rr_PerformanceTableNarrativeTextBlock

After-tax returns are calculated using the historical highest individual federal marginal income tax rates, but do not reflect the impact of state or local taxes. Actual after-tax returns may differ depending on your individual circumstances. The after-tax returns shown are not relevant if you hold your shares in a retirement account or in another tax-deferred arrangement, such as an employee benefit plan (profit sharing, 401(k), or 403(b) plan).

For the periods ended December 31, 2016

02.28 Select Portfolios: Group 6 Industrials Sector Combo PRO-04 | Industrial Equipment Portfolio | Industrial Equipment Portfolio-Default

Risk/Return:

rr_RiskReturnAbstract

Redemption fee on shares held less than 30 days (as a % of amount redeemed)

rr_RedemptionFeeOverRedemption

0.75%

Management fee

rr_ManagementFeesOverAssets

0.55%

Distribution and/or Service (12b-1) fees

rr_DistributionAndService12b1FeesOverAssets

none

Other expenses

rr_OtherExpensesOverAssets

0.28%

Total annual operating expenses

rr_ExpensesOverAssets

0.83%

1 year

rr_ExpenseExampleYear01

$ 85

3 years

rr_ExpenseExampleYear03

265

5 years

rr_ExpenseExampleYear05

460

10 years

rr_ExpenseExampleYear10

$ 1,025

2007

rr_AnnualReturn2007

23.18%

2008

rr_AnnualReturn2008

(46.77%)

2009

rr_AnnualReturn2009

38.91%

2010

rr_AnnualReturn2010

33.90%

2011

rr_AnnualReturn2011

(7.69%)

2012

rr_AnnualReturn2012

20.64%

2013

rr_AnnualReturn2013

32.76%

2014

rr_AnnualReturn2014

0.47%

2015

rr_AnnualReturn2015

2.47%

2016

rr_AnnualReturn2016

12.73%

Year to Date Return, Label

rr_YearToDateReturnLabel

Year-to-Date Return

Bar Chart, Year to Date Return, Date

rr_BarChartYearToDateReturnDate

Mar. 31, 2017

Bar Chart, Year to Date Return

rr_BarChartYearToDateReturn

3.35%

Highest Quarterly Return, Label

rr_HighestQuarterlyReturnLabel

Highest Quarter Return

Highest Quarterly Return, Date

rr_BarChartHighestQuarterlyReturnDate

Jun. 30, 2009

Highest Quarterly Return

rr_BarChartHighestQuarterlyReturn

24.86%

Lowest Quarterly Return, Label

rr_LowestQuarterlyReturnLabel

Lowest Quarter Return

Lowest Quarterly Return, Date

rr_BarChartLowestQuarterlyReturnDate

Dec. 31, 2008

Lowest Quarterly Return

rr_BarChartLowestQuarterlyReturn

(28.55%)

02.28 Select Portfolios: Group 6 Industrials Sector Combo PRO-04 | Industrial Equipment Portfolio | Return Before Taxes | Industrial Equipment Portfolio-Default

Risk/Return:

rr_RiskReturnAbstract

Column

rr_AverageAnnualReturnColumnName

Industrial Equipment Portfolio

Label

rr_AverageAnnualReturnLabel

Return Before Taxes

Past 1 year

rr_AverageAnnualReturnYear01

12.73%

Past 5 years

rr_AverageAnnualReturnYear05

13.20%

Past 10 years

rr_AverageAnnualReturnYear10

7.66%

02.28 Select Portfolios: Group 6 Industrials Sector Combo PRO-04 | Industrial Equipment Portfolio | After Taxes on Distributions | Industrial Equipment Portfolio-Default

Risk/Return:

rr_RiskReturnAbstract

Column

rr_AverageAnnualReturnColumnName

Industrial Equipment Portfolio

Label

rr_AverageAnnualReturnLabel

Return After Taxes on Distributions

Past 1 year

rr_AverageAnnualReturnYear01

11.42%

Past 5 years

rr_AverageAnnualReturnYear05

11.13%

Past 10 years

rr_AverageAnnualReturnYear10

6.49%

02.28 Select Portfolios: Group 6 Industrials Sector Combo PRO-04 | Industrial Equipment Portfolio | After Taxes on Distributions and Sales | Industrial Equipment Portfolio-Default

Risk/Return:

rr_RiskReturnAbstract

Column

rr_AverageAnnualReturnColumnName

Industrial Equipment Portfolio

Label

rr_AverageAnnualReturnLabel

Return After Taxes on Distributions and Sale of Fund Shares

Past 1 year

rr_AverageAnnualReturnYear01

8.29%

Past 5 years

rr_AverageAnnualReturnYear05

10.30%

Past 10 years

rr_AverageAnnualReturnYear10

6.09%

02.28 Select Portfolios: Group 6 Industrials Sector Combo PRO-04 | Industrial Equipment Portfolio | S&P 500® Index(reflects no deduction for fees, expenses, or taxes)

Risk/Return:

rr_RiskReturnAbstract

Past 1 year

rr_AverageAnnualReturnYear01

11.96%

Past 5 years

rr_AverageAnnualReturnYear05

14.66%

Past 10 years

rr_AverageAnnualReturnYear10

6.95%

02.28 Select Portfolios: Group 6 Industrials Sector Combo PRO-04 | Industrial Equipment Portfolio | MSCI U.S. IMI Capital Goods 25-50 Index(reflects no deduction for fees, expenses, or taxes)

Risk/Return:

rr_RiskReturnAbstract

Past 1 year

rr_AverageAnnualReturnYear01

19.90%

Past 5 years

rr_AverageAnnualReturnYear05

15.85%

Past 10 years

rr_AverageAnnualReturnYear10

7.87%

XML

02.28 Select Portfolios: Group 6 Industrials Sector Combo PRO-04 | Industrials Portfolio

Fund Summary

Fund:
Industrials Portfolio

Investment Objective

The fund seeks capital appreciation.

Fee Table

The following table describes the fees and expenses that may be incurred when you buy and hold shares of the fund.

Shareholder fees

Shareholder Fees {- Industrials Portfolio}	02.28 Select Portfolios: Group 6 Industrials Sector Combo PRO-04 Industrials Portfolio USD ($)
(fees paid directly from your investment)	none

Annual Operating Expenses

(expenses that you pay each year as a % of the value of your investment)

Annual Operating Expenses {- Industrials Portfolio}	02.28 Select Portfolios: Group 6 Industrials Sector Combo PRO-04 Industrials Portfolio Industrials Portfolio-Default
Management fee	0.55%
Distribution and/or Service (12b-1) fees	none
Other expenses	0.22%
Total annual operating expenses	0.77%

This example helps compare the cost of investing in the fund with the cost of investing in other funds.

Let's say, hypothetically, that the annual return for shares of the fund is 5% and that your shareholder fees and the annual operating expenses for shares of the fund are exactly as described in the fee table. This example illustrates the effect of fees and expenses, but is not meant to suggest actual or expected fees and expenses or returns, all of which may vary. For every $10,000 you invested, here's how much you would pay in total expenses if you sell all of your shares at the end of each time period indicated:

Sell All Shares

Expense Example {- Industrials Portfolio}	02.28 Select Portfolios: Group 6 Industrials Sector Combo PRO-04 Industrials Portfolio Industrials Portfolio-Default USD ($)
1 year	$ 79
3 years	246
5 years	428
10 years	$ 954

Portfolio Turnover

The fund pays transaction costs, such as commissions, when it buys and sells securities (or "turns over" its portfolio). A higher portfolio turnover rate may indicate higher transaction costs and may result in higher taxes when fund shares are held in a taxable account. These costs, which are not reflected in annual operating expenses or in the example, affect the fund's performance. During the most recent fiscal year, the fund's portfolio turnover rate was 62% of the average value of its portfolio.

Principal Investment Strategies

• Normally investing primarily in common stocks.

• Normally investing at least 80% of assets in securities of companies principally engaged in the research, development, manufacture, distribution, supply, or sale of industrial products, services, or equipment.

• Investing in domestic and foreign issuers.

• Using fundamental analysis of factors such as each issuer's financial condition and industry position, as well as market and economic conditions, to select investments.

Principal Investment Risks

• Stock Market Volatility. Stock markets are volatile and can decline significantly in response to adverse issuer, political, regulatory, market, or economic developments. Different parts of the market, including different market sectors, and different types of securities can react differently to these developments.

• Foreign Exposure. Foreign markets can be more volatile than the U.S. market due to increased risks of adverse issuer, political, regulatory, market, or economic developments and can perform differently from the U.S. market.

• Industrials Industry Concentration. Industrial industries can be significantly affected by general economic trends, changes in consumer sentiment and spending, commodity prices, legislation, government regulation and spending, import controls, worldwide competition, and liability for environmental damage, depletion of resources, and mandated expenditures for safety and pollution control.

• Issuer-Specific Changes. The value of an individual security or particular type of security can be more volatile than, and can perform differently from, the market as a whole. The value of securities of smaller issuers can be more volatile than that of larger issuers.

In addition, the fund is considered non-diversified and can invest a greater portion of assets in securities of a smaller number of individual issuers than a diversified fund. As a result, changes in the market value of a single investment could cause greater fluctuations in share price than would occur in a more diversified fund.

An investment in the fund is not a deposit of a bank and is not insured or guaranteed by the Federal Deposit Insurance Corporation or any other government agency. You could lose money by investing in the fund.

Performance

The following information is intended to help you understand the risks of investing in the fund. The information illustrates the changes in the performance of the fund's shares from year to year and compares the performance of the fund's shares to the performance of a securities market index and an additional index over various periods of time. The indexes have characteristics relevant to the fund's investment strategies. Index descriptions appear in the Additional Index Information section of the prospectus. Past performance (before and after taxes) is not an indication of future performance.

Visit www.fidelity.com for more recent performance information.

Year-by-Year Returns

Calendar Years

During the periods shown in the chart:	Returns	Quarter ended
Highest Quarter Return	23.63%	June 30, 2009
Lowest Quarter Return	-25.19%	December 31, 2008
Year-to-Date Return	3.00%	March 31, 2017

Average Annual Returns

After-tax returns are calculated using the historical highest individual federal marginal income tax rates, but do not reflect the impact of state or local taxes. Actual after-tax returns may differ depending on your individual circumstances. The after-tax returns shown are not relevant if you hold your shares in a retirement account or in another tax-deferred arrangement, such as an employee benefit plan (profit sharing, 401(k), or 403(b) plan).

For the periods ended December 31, 2016

Average Annual Total Returns{- Industrials Portfolio} - 02.28 Select Portfolios: Group 6 Industrials Sector Combo PRO-04 - Industrials Portfolio	Past 1 year	Past 5 years	Past 10 years
Industrials Portfolio-Default | Return Before Taxes	15.53%	14.93%	9.36%
Industrials Portfolio-Default | After Taxes on Distributions	14.39%	13.29%	8.34%
Industrials Portfolio-Default | After Taxes on Distributions and Sales	9.73%	11.79%	7.53%
S&P 500® Index(reflects no deduction for fees, expenses, or taxes)	11.96%	14.66%	6.95%
MSCI U.S. IMI Industrials 25-50 Index(reflects no deduction for fees, expenses, or taxes)	20.43%	16.02%	8.16%

XML

Label

Element

Value

Risk/Return:

rr_RiskReturnAbstract

Registrant Name

dei_EntityRegistrantName

FIDELITY SELECT PORTFOLIOS

Prospectus Date

rr_ProspectusDate

Apr. 29, 2017

02.28 Select Portfolios: Group 6 Industrials Sector Combo PRO-04 | Industrials Portfolio

Risk/Return:

rr_RiskReturnAbstract

Risk/Return [Heading]

rr_RiskReturnHeading

Fund Summary

Fund:
Industrials Portfolio

Objective [Heading]

rr_ObjectiveHeading

Investment Objective

Objective, Primary [Text Block]

rr_ObjectivePrimaryTextBlock

The fund seeks capital appreciation.

Expense [Heading]

rr_ExpenseHeading

Fee Table

Expense Narrative [Text Block]

rr_ExpenseNarrativeTextBlock

The following table describes the fees and expenses that may be incurred when you buy and hold shares of the fund.

Shareholder Fees Caption [Text]

rr_ShareholderFeesCaption

Shareholder fees

(fees paid directly from your investment)

rr_ShareholderFeeOther

none

Operating Expenses Caption [Text]

rr_OperatingExpensesCaption

Annual Operating Expenses

(expenses that you pay each year as a % of the value of your investment)

Portfolio Turnover [Heading]

rr_PortfolioTurnoverHeading

Portfolio Turnover

Portfolio Turnover [Text Block]

rr_PortfolioTurnoverTextBlock

The fund pays transaction costs, such as commissions, when it buys and sells securities (or "turns over" its portfolio). A higher portfolio turnover rate may indicate higher transaction costs and may result in higher taxes when fund shares are held in a taxable account. These costs, which are not reflected in annual operating expenses or in the example, affect the fund's performance. During the most recent fiscal year, the fund's portfolio turnover rate was 62% of the average value of its portfolio.

Portfolio Turnover, Rate

rr_PortfolioTurnoverRate

62.00%

Expense Example Narrative [Text Block]

rr_ExpenseExampleNarrativeTextBlock

This example helps compare the cost of investing in the fund with the cost of investing in other funds.

Let's say, hypothetically, that the annual return for shares of the fund is 5% and that your shareholder fees and the annual operating expenses for shares of the fund are exactly as described in the fee table. This example illustrates the effect of fees and expenses, but is not meant to suggest actual or expected fees and expenses or returns, all of which may vary. For every $10,000 you invested, here's how much you would pay in total expenses if you sell all of your shares at the end of each time period indicated:

Expense Example by, Year, Caption [Text]

rr_ExpenseExampleByYearCaption

Sell All Shares

Strategy [Heading]

rr_StrategyHeading

Principal Investment Strategies

Strategy Narrative [Text Block]

rr_StrategyNarrativeTextBlock

• Normally investing primarily in common stocks.

• Normally investing at least 80% of assets in securities of companies principally engaged in the research, development, manufacture, distribution, supply, or sale of industrial products, services, or equipment.

• Investing in domestic and foreign issuers.

• Using fundamental analysis of factors such as each issuer's financial condition and industry position, as well as market and economic conditions, to select investments.

Strategy Portfolio Concentration [Text]

rr_StrategyPortfolioConcentration

Normally investing at least 80% of assets in securities of companies principally engaged in the research, development, manufacture, distribution, supply, or sale of industrial products, services, or equipment.

Risk [Heading]

rr_RiskHeading

Principal Investment Risks

Risk Narrative [Text Block]

rr_RiskNarrativeTextBlock

• Stock Market Volatility. Stock markets are volatile and can decline significantly in response to adverse issuer, political, regulatory, market, or economic developments. Different parts of the market, including different market sectors, and different types of securities can react differently to these developments.

• Foreign Exposure. Foreign markets can be more volatile than the U.S. market due to increased risks of adverse issuer, political, regulatory, market, or economic developments and can perform differently from the U.S. market.

• Industrials Industry Concentration. Industrial industries can be significantly affected by general economic trends, changes in consumer sentiment and spending, commodity prices, legislation, government regulation and spending, import controls, worldwide competition, and liability for environmental damage, depletion of resources, and mandated expenditures for safety and pollution control.

• Issuer-Specific Changes. The value of an individual security or particular type of security can be more volatile than, and can perform differently from, the market as a whole. The value of securities of smaller issuers can be more volatile than that of larger issuers.

In addition, the fund is considered non-diversified and can invest a greater portion of assets in securities of a smaller number of individual issuers than a diversified fund. As a result, changes in the market value of a single investment could cause greater fluctuations in share price than would occur in a more diversified fund.

An investment in the fund is not a deposit of a bank and is not insured or guaranteed by the Federal Deposit Insurance Corporation or any other government agency. You could lose money by investing in the fund.

Risk Lose Money [Text]

rr_RiskLoseMoney

You could lose money by investing in the fund.

Risk Nondiversified Status [Text]

rr_RiskNondiversifiedStatus

In addition, the fund is considered non-diversified and can invest a greater portion of assets in securities of a smaller number of individual issuers than a diversified fund. As a result, changes in the market value of a single investment could cause greater fluctuations in share price than would occur in a more diversified fund.

Risk Not Insured Depository Institution [Text]

rr_RiskNotInsuredDepositoryInstitution

An investment in the fund is not a deposit of a bank and is not insured or guaranteed by the Federal Deposit Insurance Corporation or any other government agency.

Bar Chart and Performance Table [Heading]

rr_BarChartAndPerformanceTableHeading

Performance

Performance Narrative [Text Block]

rr_PerformanceNarrativeTextBlock

The following information is intended to help you understand the risks of investing in the fund. The information illustrates the changes in the performance of the fund's shares from year to year and compares the performance of the fund's shares to the performance of a securities market index and an additional index over various periods of time. The indexes have characteristics relevant to the fund's investment strategies. Index descriptions appear in the Additional Index Information section of the prospectus. Past performance (before and after taxes) is not an indication of future performance.

Visit www.fidelity.com for more recent performance information.

Performance Information Illustrates Variability of Returns [Text]

rr_PerformanceInformationIllustratesVariabilityOfReturns

The information illustrates the changes in the performance of the fund's shares from year to year and compares the performance of the fund's shares to the performance of a securities market index and an additional index over various periods of time.

Performance Availability Website Address [Text]

rr_PerformanceAvailabilityWebSiteAddress

www.fidelity.com

Performance Past Does Not Indicate Future [Text]

rr_PerformancePastDoesNotIndicateFuture

Past performance (before and after taxes) is not an indication of future performance.

Bar Chart [Heading]

rr_BarChartHeading

Year-by-Year Returns

Calendar Years

Bar Chart Closing [Text Block]

rr_BarChartClosingTextBlock

During the periods shown in the chart:	Returns	Quarter ended
Highest Quarter Return	23.63%	June 30, 2009
Lowest Quarter Return	-25.19%	December 31, 2008
Year-to-Date Return	3.00%	March 31, 2017

Performance Table Heading

rr_PerformanceTableHeading

Average Annual Returns

Performance Table Uses Highest Federal Rate

rr_PerformanceTableUsesHighestFederalRate

After-tax returns are calculated using the historical highest individual federal marginal income tax rates, but do not reflect the impact of state or local taxes.

Performance Table Not Relevant to Tax Deferred

rr_PerformanceTableNotRelevantToTaxDeferred

The after-tax returns shown are not relevant if you hold your shares in a retirement account or in another tax-deferred arrangement, such as an employee benefit plan (profit sharing, 401(k), or 403(b) plan).

Performance Table Narrative

rr_PerformanceTableNarrativeTextBlock

After-tax returns are calculated using the historical highest individual federal marginal income tax rates, but do not reflect the impact of state or local taxes. Actual after-tax returns may differ depending on your individual circumstances. The after-tax returns shown are not relevant if you hold your shares in a retirement account or in another tax-deferred arrangement, such as an employee benefit plan (profit sharing, 401(k), or 403(b) plan).

For the periods ended December 31, 2016

02.28 Select Portfolios: Group 6 Industrials Sector Combo PRO-04 | Industrials Portfolio | Industrials Portfolio-Default

Risk/Return:

rr_RiskReturnAbstract

Management fee

rr_ManagementFeesOverAssets

0.55%

Distribution and/or Service (12b-1) fees

rr_DistributionAndService12b1FeesOverAssets

none

Other expenses

rr_OtherExpensesOverAssets

0.22%

Total annual operating expenses

rr_ExpensesOverAssets

0.77%

1 year

rr_ExpenseExampleYear01

$ 79

3 years

rr_ExpenseExampleYear03

246

5 years

rr_ExpenseExampleYear05

428

10 years

rr_ExpenseExampleYear10

$ 954

2007

rr_AnnualReturn2007

17.70%

2008

rr_AnnualReturn2008

(40.14%)

2009

rr_AnnualReturn2009

38.91%

2010

rr_AnnualReturn2010

31.08%

2011

rr_AnnualReturn2011

(4.88%)

2012

rr_AnnualReturn2012

19.60%

2013

rr_AnnualReturn2013

39.90%

2014

rr_AnnualReturn2014

5.81%

2015

rr_AnnualReturn2015

(1.97%)

2016

rr_AnnualReturn2016

15.53%

Year to Date Return, Label

rr_YearToDateReturnLabel

Year-to-Date Return

Bar Chart, Year to Date Return, Date

rr_BarChartYearToDateReturnDate

Mar. 31, 2017

Bar Chart, Year to Date Return

rr_BarChartYearToDateReturn

3.00%

Highest Quarterly Return, Label

rr_HighestQuarterlyReturnLabel

Highest Quarter Return

Highest Quarterly Return, Date

rr_BarChartHighestQuarterlyReturnDate

Jun. 30, 2009

Highest Quarterly Return

rr_BarChartHighestQuarterlyReturn

23.63%

Lowest Quarterly Return, Label

rr_LowestQuarterlyReturnLabel

Lowest Quarter Return

Lowest Quarterly Return, Date

rr_BarChartLowestQuarterlyReturnDate

Dec. 31, 2008

Lowest Quarterly Return

rr_BarChartLowestQuarterlyReturn

(25.19%)

02.28 Select Portfolios: Group 6 Industrials Sector Combo PRO-04 | Industrials Portfolio | Return Before Taxes | Industrials Portfolio-Default

Risk/Return:

rr_RiskReturnAbstract

Column

rr_AverageAnnualReturnColumnName

Industrials Portfolio

Label

rr_AverageAnnualReturnLabel

Return Before Taxes

Past 1 year

rr_AverageAnnualReturnYear01

15.53%

Past 5 years

rr_AverageAnnualReturnYear05

14.93%

Past 10 years

rr_AverageAnnualReturnYear10

9.36%

02.28 Select Portfolios: Group 6 Industrials Sector Combo PRO-04 | Industrials Portfolio | After Taxes on Distributions | Industrials Portfolio-Default

Risk/Return:

rr_RiskReturnAbstract

Column

rr_AverageAnnualReturnColumnName

Industrials Portfolio

Label

rr_AverageAnnualReturnLabel

Return After Taxes on Distributions

Past 1 year

rr_AverageAnnualReturnYear01

14.39%

Past 5 years

rr_AverageAnnualReturnYear05

13.29%

Past 10 years

rr_AverageAnnualReturnYear10

8.34%

02.28 Select Portfolios: Group 6 Industrials Sector Combo PRO-04 | Industrials Portfolio | After Taxes on Distributions and Sales | Industrials Portfolio-Default

Risk/Return:

rr_RiskReturnAbstract

Column

rr_AverageAnnualReturnColumnName

Industrials Portfolio

Label

rr_AverageAnnualReturnLabel

Return After Taxes on Distributions and Sale of Fund Shares

Past 1 year

rr_AverageAnnualReturnYear01

9.73%

Past 5 years

rr_AverageAnnualReturnYear05

11.79%

Past 10 years

rr_AverageAnnualReturnYear10

7.53%

02.28 Select Portfolios: Group 6 Industrials Sector Combo PRO-04 | Industrials Portfolio | S&P 500® Index(reflects no deduction for fees, expenses, or taxes)

Risk/Return:

rr_RiskReturnAbstract

Past 1 year

rr_AverageAnnualReturnYear01

11.96%

Past 5 years

rr_AverageAnnualReturnYear05

14.66%

Past 10 years

rr_AverageAnnualReturnYear10

6.95%

02.28 Select Portfolios: Group 6 Industrials Sector Combo PRO-04 | Industrials Portfolio | MSCI U.S. IMI Industrials 25-50 Index(reflects no deduction for fees, expenses, or taxes)

Risk/Return:

rr_RiskReturnAbstract

Past 1 year

rr_AverageAnnualReturnYear01

20.43%

Past 5 years

rr_AverageAnnualReturnYear05

16.02%

Past 10 years

rr_AverageAnnualReturnYear10

8.16%

XML

02.28 Select Portfolios: Group 6 Industrials Sector Combo PRO-04 | Transportation Portfolio

Fund Summary

Fund:
Transportation Portfolio

Investment Objective

The fund seeks capital appreciation.

Fee Table

The following table describes the fees and expenses that may be incurred when you buy and hold shares of the fund.

Shareholder fees

(fees paid directly from your investment)

Shareholder Fees {- Transportation Portfolio}	02.28 Select Portfolios: Group 6 Industrials Sector Combo PRO-04 Transportation Portfolio Transportation Portfolio-Default
Redemption fee on shares held less than 30 days (as a % of amount redeemed)	0.75%

Annual Operating Expenses

(expenses that you pay each year as a % of the value of your investment)

Annual Operating Expenses {- Transportation Portfolio}	02.28 Select Portfolios: Group 6 Industrials Sector Combo PRO-04 Transportation Portfolio Transportation Portfolio-Default
Management fee	0.55%
Distribution and/or Service (12b-1) fees	none
Other expenses	0.28%
Total annual operating expenses	0.83%

This example helps compare the cost of investing in the fund with the cost of investing in other funds.

Let's say, hypothetically, that the annual return for shares of the fund is 5% and that your shareholder fees and the annual operating expenses for shares of the fund are exactly as described in the fee table. This example illustrates the effect of fees and expenses, but is not meant to suggest actual or expected fees and expenses or returns, all of which may vary. For every $10,000 you invested, here's how much you would pay in total expenses if you sell all of your shares at the end of each time period indicated:

Sell All Shares

Expense Example {- Transportation Portfolio}	02.28 Select Portfolios: Group 6 Industrials Sector Combo PRO-04 Transportation Portfolio Transportation Portfolio-Default USD ($)
1 year	$ 85
3 years	265
5 years	460
10 years	$ 1,025

Portfolio Turnover

The fund pays transaction costs, such as commissions, when it buys and sells securities (or "turns over" its portfolio). A higher portfolio turnover rate may indicate higher transaction costs and may result in higher taxes when fund shares are held in a taxable account. These costs, which are not reflected in annual operating expenses or in the example, affect the fund's performance. During the most recent fiscal year, the fund's portfolio turnover rate was 104% of the average value of its portfolio.

Principal Investment Strategies

• Normally investing primarily in common stocks.

• Normally investing at least 80% of assets in securities of companies principally engaged in providing transportation services or companies principally engaged in the design, manufacture, distribution, or sale of transportation equipment.

• Investing in domestic and foreign issuers.

• Using fundamental analysis of factors such as each issuer's financial condition and industry position, as well as market and economic conditions, to select investments.

Principal Investment Risks

• Stock Market Volatility. Stock markets are volatile and can decline significantly in response to adverse issuer, political, regulatory, market, or economic developments. Different parts of the market, including different market sectors, and different types of securities can react differently to these developments.

• Foreign Exposure. Foreign markets can be more volatile than the U.S. market due to increased risks of adverse issuer, political, regulatory, market, or economic developments and can perform differently from the U.S. market.

• Transportation Industry Concentration. The transportation industry can be significantly affected by changes in the economy, fuel prices, labor relations, insurance costs, and government regulation.

• Issuer-Specific Changes. The value of an individual security or particular type of security can be more volatile than, and can perform differently from, the market as a whole. The value of securities of smaller issuers can be more volatile than that of larger issuers.

In addition, the fund is considered non-diversified and can invest a greater portion of assets in securities of a smaller number of individual issuers than a diversified fund. As a result, changes in the market value of a single investment could cause greater fluctuations in share price than would occur in a more diversified fund.

An investment in the fund is not a deposit of a bank and is not insured or guaranteed by the Federal Deposit Insurance Corporation or any other government agency. You could lose money by investing in the fund.

Performance

The following information is intended to help you understand the risks of investing in the fund. The information illustrates the changes in the performance of the fund's shares from year to year and compares the performance of the fund's shares to the performance of a securities market index and an additional index over various periods of time. The indexes have characteristics relevant to the fund's investment strategies. Index descriptions appear in the Additional Index Information section of the prospectus. Past performance (before and after taxes) is not an indication of future performance.

Visit www.fidelity.com for more recent performance information.

Year-by-Year Returns

Calendar Years

During the periods shown in the chart:	Returns	Quarter ended
Highest Quarter Return	21.71%	September 30, 2009
Lowest Quarter Return	-21.74%	September 30, 2011
Year-to-Date Return	-0.30%	March 31, 2017

Average Annual Returns

After-tax returns are calculated using the historical highest individual federal marginal income tax rates, but do not reflect the impact of state or local taxes. Actual after-tax returns may differ depending on your individual circumstances. The after-tax returns shown are not relevant if you hold your shares in a retirement account or in another tax-deferred arrangement, such as an employee benefit plan (profit sharing, 401(k), or 403(b) plan).

For the periods ended December 31, 2016

Average Annual Total Returns{- Transportation Portfolio} - 02.28 Select Portfolios: Group 6 Industrials Sector Combo PRO-04 - Transportation Portfolio	Past 1 year	Past 5 years	Past 10 years
Transportation Portfolio-Default | Return Before Taxes	25.90%	17.77%	10.49%
Transportation Portfolio-Default | After Taxes on Distributions	25.32%	16.65%	9.64%
Transportation Portfolio-Default | After Taxes on Distributions and Sales	15.14%	14.24%	8.51%
S&P 500® Index(reflects no deduction for fees, expenses, or taxes)	11.96%	14.66%	6.95%
MSCI U.S. IMI Transportation 25-50 Index(reflects no deduction for fees, expenses, or taxes)	23.61%	18.16%	10.59%

XML

Label

Element

Value

Risk/Return:

rr_RiskReturnAbstract

Registrant Name

dei_EntityRegistrantName

FIDELITY SELECT PORTFOLIOS

Prospectus Date

rr_ProspectusDate

Apr. 29, 2017

02.28 Select Portfolios: Group 6 Industrials Sector Combo PRO-04 | Transportation Portfolio

Risk/Return:

rr_RiskReturnAbstract

Risk/Return [Heading]

rr_RiskReturnHeading

Fund Summary

Fund:
Transportation Portfolio

Objective [Heading]

rr_ObjectiveHeading

Investment Objective

Objective, Primary [Text Block]

rr_ObjectivePrimaryTextBlock

The fund seeks capital appreciation.

Expense [Heading]

rr_ExpenseHeading

Fee Table

Expense Narrative [Text Block]

rr_ExpenseNarrativeTextBlock

The following table describes the fees and expenses that may be incurred when you buy and hold shares of the fund.

Shareholder Fees Caption [Text]

rr_ShareholderFeesCaption

Shareholder fees

(fees paid directly from your investment)

Operating Expenses Caption [Text]

rr_OperatingExpensesCaption

Annual Operating Expenses

(expenses that you pay each year as a % of the value of your investment)

Portfolio Turnover [Heading]

rr_PortfolioTurnoverHeading

Portfolio Turnover

Portfolio Turnover [Text Block]

rr_PortfolioTurnoverTextBlock

The fund pays transaction costs, such as commissions, when it buys and sells securities (or "turns over" its portfolio). A higher portfolio turnover rate may indicate higher transaction costs and may result in higher taxes when fund shares are held in a taxable account. These costs, which are not reflected in annual operating expenses or in the example, affect the fund's performance. During the most recent fiscal year, the fund's portfolio turnover rate was 104% of the average value of its portfolio.

Portfolio Turnover, Rate

rr_PortfolioTurnoverRate

104.00%

Expense Example Narrative [Text Block]

rr_ExpenseExampleNarrativeTextBlock

This example helps compare the cost of investing in the fund with the cost of investing in other funds.

Let's say, hypothetically, that the annual return for shares of the fund is 5% and that your shareholder fees and the annual operating expenses for shares of the fund are exactly as described in the fee table. This example illustrates the effect of fees and expenses, but is not meant to suggest actual or expected fees and expenses or returns, all of which may vary. For every $10,000 you invested, here's how much you would pay in total expenses if you sell all of your shares at the end of each time period indicated:

Expense Example by, Year, Caption [Text]

rr_ExpenseExampleByYearCaption

Sell All Shares

Strategy [Heading]

rr_StrategyHeading

Principal Investment Strategies

Strategy Narrative [Text Block]

rr_StrategyNarrativeTextBlock

• Normally investing primarily in common stocks.

• Normally investing at least 80% of assets in securities of companies principally engaged in providing transportation services or companies principally engaged in the design, manufacture, distribution, or sale of transportation equipment.

• Investing in domestic and foreign issuers.

• Using fundamental analysis of factors such as each issuer's financial condition and industry position, as well as market and economic conditions, to select investments.

Strategy Portfolio Concentration [Text]

rr_StrategyPortfolioConcentration

Normally investing at least 80% of assets in securities of companies principally engaged in providing transportation services or companies principally engaged in the design, manufacture, distribution, or sale of transportation equipment.

Risk [Heading]

rr_RiskHeading

Principal Investment Risks

Risk Narrative [Text Block]

rr_RiskNarrativeTextBlock

• Stock Market Volatility. Stock markets are volatile and can decline significantly in response to adverse issuer, political, regulatory, market, or economic developments. Different parts of the market, including different market sectors, and different types of securities can react differently to these developments.

• Foreign Exposure. Foreign markets can be more volatile than the U.S. market due to increased risks of adverse issuer, political, regulatory, market, or economic developments and can perform differently from the U.S. market.

• Transportation Industry Concentration. The transportation industry can be significantly affected by changes in the economy, fuel prices, labor relations, insurance costs, and government regulation.

• Issuer-Specific Changes. The value of an individual security or particular type of security can be more volatile than, and can perform differently from, the market as a whole. The value of securities of smaller issuers can be more volatile than that of larger issuers.

In addition, the fund is considered non-diversified and can invest a greater portion of assets in securities of a smaller number of individual issuers than a diversified fund. As a result, changes in the market value of a single investment could cause greater fluctuations in share price than would occur in a more diversified fund.

An investment in the fund is not a deposit of a bank and is not insured or guaranteed by the Federal Deposit Insurance Corporation or any other government agency. You could lose money by investing in the fund.

Risk Lose Money [Text]

rr_RiskLoseMoney

You could lose money by investing in the fund.

Risk Nondiversified Status [Text]

rr_RiskNondiversifiedStatus

In addition, the fund is considered non-diversified and can invest a greater portion of assets in securities of a smaller number of individual issuers than a diversified fund. As a result, changes in the market value of a single investment could cause greater fluctuations in share price than would occur in a more diversified fund.

Risk Not Insured Depository Institution [Text]

rr_RiskNotInsuredDepositoryInstitution

An investment in the fund is not a deposit of a bank and is not insured or guaranteed by the Federal Deposit Insurance Corporation or any other government agency.

Bar Chart and Performance Table [Heading]

rr_BarChartAndPerformanceTableHeading

Performance

Performance Narrative [Text Block]

rr_PerformanceNarrativeTextBlock

The following information is intended to help you understand the risks of investing in the fund. The information illustrates the changes in the performance of the fund's shares from year to year and compares the performance of the fund's shares to the performance of a securities market index and an additional index over various periods of time. The indexes have characteristics relevant to the fund's investment strategies. Index descriptions appear in the Additional Index Information section of the prospectus. Past performance (before and after taxes) is not an indication of future performance.

Visit www.fidelity.com for more recent performance information.

Performance Information Illustrates Variability of Returns [Text]

rr_PerformanceInformationIllustratesVariabilityOfReturns

The information illustrates the changes in the performance of the fund's shares from year to year and compares the performance of the fund's shares to the performance of a securities market index and an additional index over various periods of time.

Performance Availability Website Address [Text]

rr_PerformanceAvailabilityWebSiteAddress

www.fidelity.com

Performance Past Does Not Indicate Future [Text]

rr_PerformancePastDoesNotIndicateFuture

Past performance (before and after taxes) is not an indication of future performance.

Bar Chart [Heading]

rr_BarChartHeading

Year-by-Year Returns

Calendar Years

Bar Chart Closing [Text Block]

rr_BarChartClosingTextBlock

During the periods shown in the chart:	Returns	Quarter ended
Highest Quarter Return	21.71%	September 30, 2009
Lowest Quarter Return	-21.74%	September 30, 2011
Year-to-Date Return	-0.30%	March 31, 2017

Performance Table Heading

rr_PerformanceTableHeading

Average Annual Returns

Performance Table Uses Highest Federal Rate

rr_PerformanceTableUsesHighestFederalRate

After-tax returns are calculated using the historical highest individual federal marginal income tax rates, but do not reflect the impact of state or local taxes.

Performance Table Not Relevant to Tax Deferred

rr_PerformanceTableNotRelevantToTaxDeferred

The after-tax returns shown are not relevant if you hold your shares in a retirement account or in another tax-deferred arrangement, such as an employee benefit plan (profit sharing, 401(k), or 403(b) plan).

Performance Table Narrative

rr_PerformanceTableNarrativeTextBlock

After-tax returns are calculated using the historical highest individual federal marginal income tax rates, but do not reflect the impact of state or local taxes. Actual after-tax returns may differ depending on your individual circumstances. The after-tax returns shown are not relevant if you hold your shares in a retirement account or in another tax-deferred arrangement, such as an employee benefit plan (profit sharing, 401(k), or 403(b) plan).

For the periods ended December 31, 2016

02.28 Select Portfolios: Group 6 Industrials Sector Combo PRO-04 | Transportation Portfolio | Transportation Portfolio-Default

Risk/Return:

rr_RiskReturnAbstract

Redemption fee on shares held less than 30 days (as a % of amount redeemed)

rr_RedemptionFeeOverRedemption

0.75%

Management fee

rr_ManagementFeesOverAssets

0.55%

Distribution and/or Service (12b-1) fees

rr_DistributionAndService12b1FeesOverAssets

none

Other expenses

rr_OtherExpensesOverAssets

0.28%

Total annual operating expenses

rr_ExpensesOverAssets

0.83%

1 year

rr_ExpenseExampleYear01

$ 85

3 years

rr_ExpenseExampleYear03

265

5 years

rr_ExpenseExampleYear05

460

10 years

rr_ExpenseExampleYear10

$ 1,025

2007

rr_AnnualReturn2007

(0.59%)

2008

rr_AnnualReturn2008

(27.03%)

2009

rr_AnnualReturn2009

23.29%

2010

rr_AnnualReturn2010

41.30%

2011

rr_AnnualReturn2011

(5.28%)

2012

rr_AnnualReturn2012

11.10%

2013

rr_AnnualReturn2013

48.35%

2014

rr_AnnualReturn2014

34.01%

2015

rr_AnnualReturn2015

(18.51%)

2016

rr_AnnualReturn2016

25.90%

Year to Date Return, Label

rr_YearToDateReturnLabel

Year-to-Date Return

Bar Chart, Year to Date Return, Date

rr_BarChartYearToDateReturnDate

Mar. 31, 2017

Bar Chart, Year to Date Return

rr_BarChartYearToDateReturn

(0.30%)

Highest Quarterly Return, Label

rr_HighestQuarterlyReturnLabel

Highest Quarter Return

Highest Quarterly Return, Date

rr_BarChartHighestQuarterlyReturnDate

Sep. 30, 2009

Highest Quarterly Return

rr_BarChartHighestQuarterlyReturn

21.71%

Lowest Quarterly Return, Label

rr_LowestQuarterlyReturnLabel

Lowest Quarter Return

Lowest Quarterly Return, Date

rr_BarChartLowestQuarterlyReturnDate

Sep. 30, 2011

Lowest Quarterly Return

rr_BarChartLowestQuarterlyReturn

(21.74%)

02.28 Select Portfolios: Group 6 Industrials Sector Combo PRO-04 | Transportation Portfolio | Return Before Taxes | Transportation Portfolio-Default

Risk/Return:

rr_RiskReturnAbstract

Column

rr_AverageAnnualReturnColumnName

Transportation Portfolio

Label

rr_AverageAnnualReturnLabel

Return Before Taxes

Past 1 year

rr_AverageAnnualReturnYear01

25.90%

Past 5 years

rr_AverageAnnualReturnYear05

17.77%

Past 10 years

rr_AverageAnnualReturnYear10

10.49%

02.28 Select Portfolios: Group 6 Industrials Sector Combo PRO-04 | Transportation Portfolio | After Taxes on Distributions | Transportation Portfolio-Default

Risk/Return:

rr_RiskReturnAbstract

Column

rr_AverageAnnualReturnColumnName

Transportation Portfolio

Label

rr_AverageAnnualReturnLabel

Return After Taxes on Distributions

Past 1 year

rr_AverageAnnualReturnYear01

25.32%

Past 5 years

rr_AverageAnnualReturnYear05

16.65%

Past 10 years

rr_AverageAnnualReturnYear10

9.64%

02.28 Select Portfolios: Group 6 Industrials Sector Combo PRO-04 | Transportation Portfolio | After Taxes on Distributions and Sales | Transportation Portfolio-Default

Risk/Return:

rr_RiskReturnAbstract

Column

rr_AverageAnnualReturnColumnName

Transportation Portfolio

Label

rr_AverageAnnualReturnLabel

Return After Taxes on Distributions and Sale of Fund Shares

Past 1 year

rr_AverageAnnualReturnYear01

15.14%

Past 5 years

rr_AverageAnnualReturnYear05

14.24%

Past 10 years

rr_AverageAnnualReturnYear10

8.51%

02.28 Select Portfolios: Group 6 Industrials Sector Combo PRO-04 | Transportation Portfolio | S&P 500® Index(reflects no deduction for fees, expenses, or taxes)

Risk/Return:

rr_RiskReturnAbstract

Past 1 year

rr_AverageAnnualReturnYear01

11.96%

Past 5 years

rr_AverageAnnualReturnYear05

14.66%

Past 10 years

rr_AverageAnnualReturnYear10

6.95%

02.28 Select Portfolios: Group 6 Industrials Sector Combo PRO-04 | Transportation Portfolio | MSCI U.S. IMI Transportation 25-50 Index(reflects no deduction for fees, expenses, or taxes)

Risk/Return:

rr_RiskReturnAbstract

Past 1 year

rr_AverageAnnualReturnYear01

23.61%

Past 5 years

rr_AverageAnnualReturnYear05

18.16%

Past 10 years

rr_AverageAnnualReturnYear10

10.59%

XML

02.28 Select Portfolios: Group 8 Materials Sector Retail Combo PRO-06 | Chemicals Portfolio

Fund Summary

Fund:
Chemicals Portfolio

Investment Objective

The fund seeks capital appreciation.

Fee Table

The following table describes the fees and expenses that may be incurred when you buy and hold shares of the fund.

Shareholder fees

Shareholder Fees {- Chemicals Portfolio}	02.28 Select Portfolios: Group 8 Materials Sector Retail Combo PRO-06 Chemicals Portfolio USD ($)
(fees paid directly from your investment)	none

Annual Operating Expenses

(expenses that you pay each year as a % of the value of your investment)

Annual Operating Expenses {- Chemicals Portfolio}	02.28 Select Portfolios: Group 8 Materials Sector Retail Combo PRO-06 Chemicals Portfolio Chemicals Portfolio-Default
Management fee	0.55%
Distribution and/or Service (12b-1) fees	none
Other expenses	0.25%
Total annual operating expenses	0.80%

This example helps compare the cost of investing in the fund with the cost of investing in other funds.

Let's say, hypothetically, that the annual return for shares of the fund is 5% and that your shareholder fees and the annual operating expenses for shares of the fund are exactly as described in the fee table. This example illustrates the effect of fees and expenses, but is not meant to suggest actual or expected fees and expenses or returns, all of which may vary. For every $10,000 you invested, here's how much you would pay in total expenses if you sell all of your shares at the end of each time period indicated:

Sell All Shares

Expense Example {- Chemicals Portfolio}	02.28 Select Portfolios: Group 8 Materials Sector Retail Combo PRO-06 Chemicals Portfolio Chemicals Portfolio-Default USD ($)
1 year	$ 82
3 years	255
5 years	444
10 years	$ 990

Portfolio Turnover

The fund pays transaction costs, such as commissions, when it buys and sells securities (or "turns over" its portfolio). A higher portfolio turnover rate may indicate higher transaction costs and may result in higher taxes when fund shares are held in a taxable account. These costs, which are not reflected in annual operating expenses or in the example, affect the fund's performance. During the most recent fiscal year, the fund's portfolio turnover rate was 85% of the average value of its portfolio.

Principal Investment Strategies

• Normally investing primarily in common stocks.

• Normally investing at least 80% of assets in securities of companies principally engaged in the research, development, manufacture, or marketing of products or services related to the chemical process industries.

• Investing in domestic and foreign issuers.

• Using fundamental analysis of factors such as each issuer's financial condition and industry position, as well as market and economic conditions, to select investments.

Principal Investment Risks

• Stock Market Volatility. Stock markets are volatile and can decline significantly in response to adverse issuer, political, regulatory, market, or economic developments. Different parts of the market, including different market sectors, and different types of securities can react differently to these developments.

• Foreign Exposure. Foreign markets can be more volatile than the U.S. market due to increased risks of adverse issuer, political, regulatory, market, or economic developments and can perform differently from the U.S. market.

• Chemicals Industry Concentration. The chemicals industry can be significantly affected by intense competition, product obsolescence, raw materials prices, and government regulation, and can be subject to risks associated with the production, handling, and disposal of hazardous components.

• Issuer-Specific Changes. The value of an individual security or particular type of security can be more volatile than, and can perform differently from, the market as a whole. The value of securities of smaller issuers can be more volatile than that of larger issuers.

In addition, the fund is considered non-diversified and can invest a greater portion of assets in securities of a smaller number of individual issuers than a diversified fund. As a result, changes in the market value of a single investment could cause greater fluctuations in share price than would occur in a more diversified fund.

An investment in the fund is not a deposit of a bank and is not insured or guaranteed by the Federal Deposit Insurance Corporation or any other government agency. You could lose money by investing in the fund.

Performance

The following information is intended to help you understand the risks of investing in the fund. The information illustrates the changes in the performance of the fund's shares from year to year and compares the performance of the fund's shares to the performance of a securities market index and an additional index over various periods of time. The indexes have characteristics relevant to the fund's investment strategies. Index descriptions appear in the Additional Index Information section of the prospectus. Past performance (before and after taxes) is not an indication of future performance.

Visit www.fidelity.com for more recent performance information.

Year-by-Year Returns

Calendar Years

During the periods shown in the chart:	Returns	Quarter ended
Highest Quarter Return	25.28%	September 30, 2009
Lowest Quarter Return	-31.90%	December 31, 2008
Year-to-Date Return	12.12%	March 31, 2017

Average Annual Returns

After-tax returns are calculated using the historical highest individual federal marginal income tax rates, but do not reflect the impact of state or local taxes. Actual after-tax returns may differ depending on your individual circumstances. The after-tax returns shown are not relevant if you hold your shares in a retirement account or in another tax-deferred arrangement, such as an employee benefit plan (profit sharing, 401(k), or 403(b) plan).

For the periods ended December 31, 2016

Average Annual Total Returns{- Chemicals Portfolio} - 02.28 Select Portfolios: Group 8 Materials Sector Retail Combo PRO-06 - Chemicals Portfolio	Past 1 year	Past 5 years	Past 10 years
Chemicals Portfolio-Default | Return Before Taxes	17.98%	14.60%	12.04%
Chemicals Portfolio-Default | After Taxes on Distributions	16.44%	13.21%	11.16%
Chemicals Portfolio-Default | After Taxes on Distributions and Sales	10.95%	11.50%	9.86%
S&P 500® Index(reflects no deduction for fees, expenses, or taxes)	11.96%	14.66%	6.95%
MSCI U.S. IMI Chemicals 25-50 Index(reflects no deduction for fees, expenses, or taxes)	17.45%	14.76%	11.05%

XML

Label

Element

Value

Risk/Return:

rr_RiskReturnAbstract

Registrant Name

dei_EntityRegistrantName

FIDELITY SELECT PORTFOLIOS

Prospectus Date

rr_ProspectusDate

Apr. 29, 2017

02.28 Select Portfolios: Group 8 Materials Sector Retail Combo PRO-06 | Chemicals Portfolio

Risk/Return:

rr_RiskReturnAbstract

Risk/Return [Heading]

rr_RiskReturnHeading

Fund Summary

Fund:
Chemicals Portfolio

Objective [Heading]

rr_ObjectiveHeading

Investment Objective

Objective, Primary [Text Block]

rr_ObjectivePrimaryTextBlock

The fund seeks capital appreciation.

Expense [Heading]

rr_ExpenseHeading

Fee Table

Expense Narrative [Text Block]

rr_ExpenseNarrativeTextBlock

The following table describes the fees and expenses that may be incurred when you buy and hold shares of the fund.

Shareholder Fees Caption [Text]

rr_ShareholderFeesCaption

Shareholder fees

(fees paid directly from your investment)

rr_ShareholderFeeOther

none

Operating Expenses Caption [Text]

rr_OperatingExpensesCaption

Annual Operating Expenses

(expenses that you pay each year as a % of the value of your investment)

Portfolio Turnover [Heading]

rr_PortfolioTurnoverHeading

Portfolio Turnover

Portfolio Turnover [Text Block]

rr_PortfolioTurnoverTextBlock

The fund pays transaction costs, such as commissions, when it buys and sells securities (or "turns over" its portfolio). A higher portfolio turnover rate may indicate higher transaction costs and may result in higher taxes when fund shares are held in a taxable account. These costs, which are not reflected in annual operating expenses or in the example, affect the fund's performance. During the most recent fiscal year, the fund's portfolio turnover rate was 85% of the average value of its portfolio.

Portfolio Turnover, Rate

rr_PortfolioTurnoverRate

85.00%

Expense Example Narrative [Text Block]

rr_ExpenseExampleNarrativeTextBlock

This example helps compare the cost of investing in the fund with the cost of investing in other funds.

Let's say, hypothetically, that the annual return for shares of the fund is 5% and that your shareholder fees and the annual operating expenses for shares of the fund are exactly as described in the fee table. This example illustrates the effect of fees and expenses, but is not meant to suggest actual or expected fees and expenses or returns, all of which may vary. For every $10,000 you invested, here's how much you would pay in total expenses if you sell all of your shares at the end of each time period indicated:

Expense Example by, Year, Caption [Text]

rr_ExpenseExampleByYearCaption

Sell All Shares

Strategy [Heading]

rr_StrategyHeading

Principal Investment Strategies

Strategy Narrative [Text Block]

rr_StrategyNarrativeTextBlock

• Normally investing primarily in common stocks.

• Normally investing at least 80% of assets in securities of companies principally engaged in the research, development, manufacture, or marketing of products or services related to the chemical process industries.

• Investing in domestic and foreign issuers.

• Using fundamental analysis of factors such as each issuer's financial condition and industry position, as well as market and economic conditions, to select investments.

Strategy Portfolio Concentration [Text]

rr_StrategyPortfolioConcentration

Normally investing at least 80% of assets in securities of companies principally engaged in the research, development, manufacture, or marketing of products or services related to the chemical process industries.

Risk [Heading]

rr_RiskHeading

Principal Investment Risks

Risk Narrative [Text Block]

rr_RiskNarrativeTextBlock

• Stock Market Volatility. Stock markets are volatile and can decline significantly in response to adverse issuer, political, regulatory, market, or economic developments. Different parts of the market, including different market sectors, and different types of securities can react differently to these developments.

• Foreign Exposure. Foreign markets can be more volatile than the U.S. market due to increased risks of adverse issuer, political, regulatory, market, or economic developments and can perform differently from the U.S. market.

• Chemicals Industry Concentration. The chemicals industry can be significantly affected by intense competition, product obsolescence, raw materials prices, and government regulation, and can be subject to risks associated with the production, handling, and disposal of hazardous components.

• Issuer-Specific Changes. The value of an individual security or particular type of security can be more volatile than, and can perform differently from, the market as a whole. The value of securities of smaller issuers can be more volatile than that of larger issuers.

In addition, the fund is considered non-diversified and can invest a greater portion of assets in securities of a smaller number of individual issuers than a diversified fund. As a result, changes in the market value of a single investment could cause greater fluctuations in share price than would occur in a more diversified fund.

An investment in the fund is not a deposit of a bank and is not insured or guaranteed by the Federal Deposit Insurance Corporation or any other government agency. You could lose money by investing in the fund.

Risk Lose Money [Text]

rr_RiskLoseMoney

You could lose money by investing in the fund.

Risk Nondiversified Status [Text]

rr_RiskNondiversifiedStatus

In addition, the fund is considered non-diversified and can invest a greater portion of assets in securities of a smaller number of individual issuers than a diversified fund. As a result, changes in the market value of a single investment could cause greater fluctuations in share price than would occur in a more diversified fund.

Risk Not Insured Depository Institution [Text]

rr_RiskNotInsuredDepositoryInstitution

An investment in the fund is not a deposit of a bank and is not insured or guaranteed by the Federal Deposit Insurance Corporation or any other government agency.

Bar Chart and Performance Table [Heading]

rr_BarChartAndPerformanceTableHeading

Performance

Performance Narrative [Text Block]

rr_PerformanceNarrativeTextBlock

The following information is intended to help you understand the risks of investing in the fund. The information illustrates the changes in the performance of the fund's shares from year to year and compares the performance of the fund's shares to the performance of a securities market index and an additional index over various periods of time. The indexes have characteristics relevant to the fund's investment strategies. Index descriptions appear in the Additional Index Information section of the prospectus. Past performance (before and after taxes) is not an indication of future performance.

Visit www.fidelity.com for more recent performance information.

Performance Information Illustrates Variability of Returns [Text]

rr_PerformanceInformationIllustratesVariabilityOfReturns

The information illustrates the changes in the performance of the fund's shares from year to year and compares the performance of the fund's shares to the performance of a securities market index and an additional index over various periods of time.

Performance Availability Website Address [Text]

rr_PerformanceAvailabilityWebSiteAddress

www.fidelity.com

Performance Past Does Not Indicate Future [Text]

rr_PerformancePastDoesNotIndicateFuture

Past performance (before and after taxes) is not an indication of future performance.

Bar Chart [Heading]

rr_BarChartHeading

Year-by-Year Returns

Calendar Years

Bar Chart Closing [Text Block]

rr_BarChartClosingTextBlock

During the periods shown in the chart:	Returns	Quarter ended
Highest Quarter Return	25.28%	September 30, 2009
Lowest Quarter Return	-31.90%	December 31, 2008
Year-to-Date Return	12.12%	March 31, 2017

Performance Table Heading

rr_PerformanceTableHeading

Average Annual Returns

Performance Table Uses Highest Federal Rate

rr_PerformanceTableUsesHighestFederalRate

After-tax returns are calculated using the historical highest individual federal marginal income tax rates, but do not reflect the impact of state or local taxes.

Performance Table Not Relevant to Tax Deferred

rr_PerformanceTableNotRelevantToTaxDeferred

The after-tax returns shown are not relevant if you hold your shares in a retirement account or in another tax-deferred arrangement, such as an employee benefit plan (profit sharing, 401(k), or 403(b) plan).

Performance Table Narrative

rr_PerformanceTableNarrativeTextBlock

After-tax returns are calculated using the historical highest individual federal marginal income tax rates, but do not reflect the impact of state or local taxes. Actual after-tax returns may differ depending on your individual circumstances. The after-tax returns shown are not relevant if you hold your shares in a retirement account or in another tax-deferred arrangement, such as an employee benefit plan (profit sharing, 401(k), or 403(b) plan).

For the periods ended December 31, 2016

02.28 Select Portfolios: Group 8 Materials Sector Retail Combo PRO-06 | Chemicals Portfolio | Chemicals Portfolio-Default

Risk/Return:

rr_RiskReturnAbstract

Management fee

rr_ManagementFeesOverAssets

0.55%

Distribution and/or Service (12b-1) fees

rr_DistributionAndService12b1FeesOverAssets

none

Other expenses

rr_OtherExpensesOverAssets

0.25%

Total annual operating expenses

rr_ExpensesOverAssets

0.80%

1 year

rr_ExpenseExampleYear01

$ 82

3 years

rr_ExpenseExampleYear03

255

5 years

rr_ExpenseExampleYear05

444

10 years

rr_ExpenseExampleYear10

$ 990

2007

rr_AnnualReturn2007

28.42%

2008

rr_AnnualReturn2008

(43.34%)

2009

rr_AnnualReturn2009

65.32%

2010

rr_AnnualReturn2010

30.73%

2011

rr_AnnualReturn2011

0.29%

2012

rr_AnnualReturn2012

30.01%

2013

rr_AnnualReturn2013

29.86%

2014

rr_AnnualReturn2014

4.56%

2015

rr_AnnualReturn2015

(5.10%)

2016

rr_AnnualReturn2016

17.98%

Year to Date Return, Label

rr_YearToDateReturnLabel

Year-to-Date Return

Bar Chart, Year to Date Return, Date

rr_BarChartYearToDateReturnDate

Mar. 31, 2017

Bar Chart, Year to Date Return

rr_BarChartYearToDateReturn

12.12%

Highest Quarterly Return, Label

rr_HighestQuarterlyReturnLabel

Highest Quarter Return

Highest Quarterly Return, Date

rr_BarChartHighestQuarterlyReturnDate

Sep. 30, 2009

Highest Quarterly Return

rr_BarChartHighestQuarterlyReturn

25.28%

Lowest Quarterly Return, Label

rr_LowestQuarterlyReturnLabel

Lowest Quarter Return

Lowest Quarterly Return, Date

rr_BarChartLowestQuarterlyReturnDate

Dec. 31, 2008

Lowest Quarterly Return

rr_BarChartLowestQuarterlyReturn

(31.90%)

02.28 Select Portfolios: Group 8 Materials Sector Retail Combo PRO-06 | Chemicals Portfolio | Return Before Taxes | Chemicals Portfolio-Default

Risk/Return:

rr_RiskReturnAbstract

Column

rr_AverageAnnualReturnColumnName

Chemicals Portfolio

Label

rr_AverageAnnualReturnLabel

Return Before Taxes

Past 1 year

rr_AverageAnnualReturnYear01

17.98%

Past 5 years

rr_AverageAnnualReturnYear05

14.60%

Past 10 years

rr_AverageAnnualReturnYear10

12.04%

02.28 Select Portfolios: Group 8 Materials Sector Retail Combo PRO-06 | Chemicals Portfolio | After Taxes on Distributions | Chemicals Portfolio-Default

Risk/Return:

rr_RiskReturnAbstract

Column

rr_AverageAnnualReturnColumnName

Chemicals Portfolio

Label

rr_AverageAnnualReturnLabel

Return After Taxes on Distributions

Past 1 year

rr_AverageAnnualReturnYear01

16.44%

Past 5 years

rr_AverageAnnualReturnYear05

13.21%

Past 10 years

rr_AverageAnnualReturnYear10

11.16%

02.28 Select Portfolios: Group 8 Materials Sector Retail Combo PRO-06 | Chemicals Portfolio | After Taxes on Distributions and Sales | Chemicals Portfolio-Default

Risk/Return:

rr_RiskReturnAbstract

Column

rr_AverageAnnualReturnColumnName

Chemicals Portfolio

Label

rr_AverageAnnualReturnLabel

Return After Taxes on Distributions and Sale of Fund Shares

Past 1 year

rr_AverageAnnualReturnYear01

10.95%

Past 5 years

rr_AverageAnnualReturnYear05

11.50%

Past 10 years

rr_AverageAnnualReturnYear10

9.86%

02.28 Select Portfolios: Group 8 Materials Sector Retail Combo PRO-06 | Chemicals Portfolio | S&P 500® Index(reflects no deduction for fees, expenses, or taxes)

Risk/Return:

rr_RiskReturnAbstract

Past 1 year

rr_AverageAnnualReturnYear01

11.96%

Past 5 years

rr_AverageAnnualReturnYear05

14.66%

Past 10 years

rr_AverageAnnualReturnYear10

6.95%

02.28 Select Portfolios: Group 8 Materials Sector Retail Combo PRO-06 | Chemicals Portfolio | MSCI U.S. IMI Chemicals 25-50 Index(reflects no deduction for fees, expenses, or taxes)

Risk/Return:

rr_RiskReturnAbstract

Past 1 year

rr_AverageAnnualReturnYear01

17.45%

Past 5 years

rr_AverageAnnualReturnYear05

14.76%

Past 10 years

rr_AverageAnnualReturnYear10

11.05%

XML

02.28 Select Portfolios: Group 8 Materials Sector Retail Combo PRO-06 | Gold Portfolio

Fund Summary

Fund/Class:
Gold Portfolio/Gold Portfolio

Investment Objective

The fund seeks capital appreciation.

Fee Table

The following table describes the fees and expenses that may be incurred when you buy and hold shares of the fund.

Shareholder fees

Shareholder Fees {- Gold Portfolio}	02.28 Select Portfolios: Group 8 Materials Sector Retail Combo PRO-06 Gold Portfolio USD ($)
(fees paid directly from your investment)	none

Annual Operating Expenses

(expenses that you pay each year as a % of the value of your investment)

Annual Operating Expenses {- Gold Portfolio}	02.28 Select Portfolios: Group 8 Materials Sector Retail Combo PRO-06 Gold Portfolio Gold Portfolio-Retail Class
Management fee	0.55%
Distribution and/or Service (12b-1) fees	none
Other expenses	0.28%
Acquired fund fees and expenses	0.04%	[1]
Total annual operating expenses	0.87%
Fee waiver and/or expense reimbursement	0.03%	[1]
Total annual operating expenses after fee waiver and/or expense reimbursement	0.84%

This example helps compare the cost of investing in the fund with the cost of investing in other funds.

Let's say, hypothetically, that the annual return for shares of the fund is 5% and that your shareholder fees and the annual operating expenses for shares of the fund are exactly as described in the fee table. This example illustrates the effect of fees and expenses, but is not meant to suggest actual or expected fees and expenses or returns, all of which may vary. For every $10,000 you invested, here's how much you would pay in total expenses if you sell all of your shares at the end of each time period indicated:

Sell All Shares

Expense Example {- Gold Portfolio}	02.28 Select Portfolios: Group 8 Materials Sector Retail Combo PRO-06 Gold Portfolio Gold Portfolio-Retail Class USD ($)
1 year	$ 86
3 years	268
5 years	466
10 years	$ 1,037

Portfolio Turnover

The fund pays transaction costs, such as commissions, when it buys and sells securities (or "turns over" its portfolio). A higher portfolio turnover rate may indicate higher transaction costs and may result in higher taxes when fund shares are held in a taxable account. These costs, which are not reflected in annual operating expenses or in the example, affect the fund's performance. During the most recent fiscal year, the fund's portfolio turnover rate was 28% of the average value of its portfolio.

Principal Investment Strategies

• Normally investing primarily in common stocks and in certain precious metals.

• Investing primarily in companies engaged in exploration, mining, processing, or dealing in gold, or to a lesser degree, in silver, platinum, diamonds, or other precious metals and minerals.

• Normally investing at least 80% of assets in securities of companies principally engaged in gold-related activities, and in gold bullion or coins.

• Investing up to 25% of assets in gold and other precious metals through a wholly-owned subsidiary.

• Potentially investing in other precious metals, instruments whose value is linked to the price of precious metals, and securities of companies that manufacture and distribute precious metal and minerals products (such as jewelry, watches, and metal foil and leaf) and companies that invest in other companies engaged in gold and other precious metal and mineral-related activities.

• Investing in domestic and foreign issuers.

• Using fundamental analysis of factors such as each issuer's financial condition and industry position, as well as market and economic conditions, to select investments.

Principal Investment Risks

• Stock Market Volatility. Stock markets are volatile and can decline significantly in response to adverse issuer, political, regulatory, market, or economic developments. Different parts of the market, including different market sectors, and different types of securities can react differently to these developments.

• Foreign Exposure. Foreign markets, particularly emerging markets, can be more volatile than the U.S. market due to increased risks of adverse issuer, political, regulatory, market, or economic developments and can perform differently from the U.S. market. Emerging markets can be subject to greater social, economic, regulatory, and political uncertainties and can be extremely volatile. Foreign exchange rates also can be extremely volatile.

• Gold Industry Concentration. The gold industry can be significantly affected by international monetary and political developments such as currency devaluations or revaluations, central bank movements, economic and social conditions within a country, trade imbalances, or trade or currency restrictions between countries, as well as supply and demand for gold and operational costs associated with mining.

• Subsidiary Risk. Investment in an unregistered subsidiary is not subject to the investor protections of the Investment Company Act of 1940 (1940 Act) and is subject to the risks associated with the gold industry. Changes in tax and other laws could negatively affect investments in the subsidiary.

• Issuer-Specific Changes. The value of an individual security or particular type of security can be more volatile than, and can perform differently from, the market as a whole. The value of securities of smaller issuers can be more volatile than that of larger issuers.

In addition, the fund is considered non-diversified and can invest a greater portion of assets in securities of a smaller number of individual issuers than a diversified fund. As a result, changes in the market value of a single investment could cause greater fluctuations in share price than would occur in a more diversified fund.

An investment in the fund is not a deposit of a bank and is not insured or guaranteed by the Federal Deposit Insurance Corporation or any other government agency. You could lose money by investing in the fund.

Performance

The following information is intended to help you understand the risks of investing in the fund. The information illustrates the changes in the performance of the fund's shares from year to year and compares the performance of the fund's shares to the performance of a securities market index and an additional index over various periods of time. The indexes have characteristics relevant to the fund's investment strategies. Index descriptions appear in the Additional Index Information section of the prospectus. Past performance (before and after taxes) is not an indication of future performance.

Visit www.fidelity.com for more recent performance information.

Year-by-Year Returns

Calendar Years

During the periods shown in the chart:	Returns	Quarter ended
Highest Quarter Return	41.04%	March 31, 2016
Lowest Quarter Return	-37.37%	June 30, 2013
Year-to-Date Return	9.71%	March 31, 2017

Average Annual Returns

After-tax returns are calculated using the historical highest individual federal marginal income tax rates, but do not reflect the impact of state or local taxes. Actual after-tax returns may differ depending on your individual circumstances. The after-tax returns shown are not relevant if you hold your shares in a retirement account or in another tax-deferred arrangement, such as an employee benefit plan (profit sharing, 401(k), or 403(b) plan). Return After Taxes on Distributions and Sale of Fund Shares may be higher than other returns for the same period due to a tax benefit of realizing a capital loss upon the sale of fund shares.

For the periods ended December 31, 2016

Average Annual Total Returns{- Gold Portfolio} - 02.28 Select Portfolios: Group 8 Materials Sector Retail Combo PRO-06 - Gold Portfolio	Past 1 year	Past 5 years	Past 10 years
Gold Portfolio-Retail Class | Return Before Taxes	47.28%	(13.99%)	(3.10%)
Gold Portfolio-Retail Class | After Taxes on Distributions	45.19%	(14.23%)	(3.89%)
Gold Portfolio-Retail Class | After Taxes on Distributions and Sales	26.93%	(9.89%)	(1.88%)
S&P 500® Index(reflects no deduction for fees, expenses, or taxes)	11.96%	14.66%	6.95%
S&P® Global BMI Gold Capped Index(reflects no deduction for fees, expenses, or taxes)	58.24%	(14.10%)	(4.20%)

[1] The fund may invest in a wholly-owned subsidiary. The subsidiary has entered into a separate contract with Fidelity Management & Research Company (FMR), an affiliate of Fidelity SelectCo, LLC (SelectCo), the fund's investment adviser, for the management of its portfolio pursuant to which the subsidiary pays FMR a fee at an annual rate of 0.30% of its net assets. The subsidiary also pays certain other expenses including custody fees. SelectCo has contractually agreed to waive the fund's management fee in an amount equal to the management fee paid to FMR by the subsidiary. This arrangement will remain in effect for at least one year from the effective date of the prospectus, and will remain in effect thereafter as long as FMR's contract with the subsidiary is in place. If FMR's contract with the subsidiary is terminated, SelectCo, in its sole discretion, may discontinue the arrangement.

XML

Label

Element

Value

Risk/Return:

rr_RiskReturnAbstract

Registrant Name

dei_EntityRegistrantName

FIDELITY SELECT PORTFOLIOS

Prospectus Date

rr_ProspectusDate

Apr. 29, 2017

02.28 Select Portfolios: Group 8 Materials Sector Retail Combo PRO-06 | Gold Portfolio

Risk/Return:

rr_RiskReturnAbstract

Risk/Return [Heading]

rr_RiskReturnHeading

Fund Summary

Fund/Class:
Gold Portfolio/Gold Portfolio

Objective [Heading]

rr_ObjectiveHeading

Investment Objective

Objective, Primary [Text Block]

rr_ObjectivePrimaryTextBlock

The fund seeks capital appreciation.

Expense [Heading]

rr_ExpenseHeading

Fee Table

Expense Narrative [Text Block]

rr_ExpenseNarrativeTextBlock

The following table describes the fees and expenses that may be incurred when you buy and hold shares of the fund.

Shareholder Fees Caption [Text]

rr_ShareholderFeesCaption

Shareholder fees

(fees paid directly from your investment)

rr_ShareholderFeeOther

none

Operating Expenses Caption [Text]

rr_OperatingExpensesCaption

Annual Operating Expenses

(expenses that you pay each year as a % of the value of your investment)

Fee Waiver or Reimbursement over Assets, Date of Termination

rr_FeeWaiverOrReimbursementOverAssetsDateOfTermination

remain in effect for at least one year from the effective date of the prospectus, and will remain in effect thereafter as long as FMR's contract with the subsidiary is in place.

Portfolio Turnover [Heading]

rr_PortfolioTurnoverHeading

Portfolio Turnover

Portfolio Turnover [Text Block]

rr_PortfolioTurnoverTextBlock

The fund pays transaction costs, such as commissions, when it buys and sells securities (or "turns over" its portfolio). A higher portfolio turnover rate may indicate higher transaction costs and may result in higher taxes when fund shares are held in a taxable account. These costs, which are not reflected in annual operating expenses or in the example, affect the fund's performance. During the most recent fiscal year, the fund's portfolio turnover rate was 28% of the average value of its portfolio.

Portfolio Turnover, Rate

rr_PortfolioTurnoverRate

28.00%

Expense Example Narrative [Text Block]

rr_ExpenseExampleNarrativeTextBlock

This example helps compare the cost of investing in the fund with the cost of investing in other funds.

Let's say, hypothetically, that the annual return for shares of the fund is 5% and that your shareholder fees and the annual operating expenses for shares of the fund are exactly as described in the fee table. This example illustrates the effect of fees and expenses, but is not meant to suggest actual or expected fees and expenses or returns, all of which may vary. For every $10,000 you invested, here's how much you would pay in total expenses if you sell all of your shares at the end of each time period indicated:

Expense Example by, Year, Caption [Text]

rr_ExpenseExampleByYearCaption

Sell All Shares

Strategy [Heading]

rr_StrategyHeading

Principal Investment Strategies

Strategy Narrative [Text Block]

rr_StrategyNarrativeTextBlock

• Normally investing primarily in common stocks and in certain precious metals.

• Investing primarily in companies engaged in exploration, mining, processing, or dealing in gold, or to a lesser degree, in silver, platinum, diamonds, or other precious metals and minerals.

• Normally investing at least 80% of assets in securities of companies principally engaged in gold-related activities, and in gold bullion or coins.

• Investing up to 25% of assets in gold and other precious metals through a wholly-owned subsidiary.

• Potentially investing in other precious metals, instruments whose value is linked to the price of precious metals, and securities of companies that manufacture and distribute precious metal and minerals products (such as jewelry, watches, and metal foil and leaf) and companies that invest in other companies engaged in gold and other precious metal and mineral-related activities.

• Investing in domestic and foreign issuers.

• Using fundamental analysis of factors such as each issuer's financial condition and industry position, as well as market and economic conditions, to select investments.

Strategy Portfolio Concentration [Text]

rr_StrategyPortfolioConcentration

Normally investing at least 80% of assets in securities of companies principally engaged in gold-related activities, and in gold bullion or coins.

Risk [Heading]

rr_RiskHeading

Principal Investment Risks

Risk Narrative [Text Block]

rr_RiskNarrativeTextBlock

• Stock Market Volatility. Stock markets are volatile and can decline significantly in response to adverse issuer, political, regulatory, market, or economic developments. Different parts of the market, including different market sectors, and different types of securities can react differently to these developments.

• Foreign Exposure. Foreign markets, particularly emerging markets, can be more volatile than the U.S. market due to increased risks of adverse issuer, political, regulatory, market, or economic developments and can perform differently from the U.S. market. Emerging markets can be subject to greater social, economic, regulatory, and political uncertainties and can be extremely volatile. Foreign exchange rates also can be extremely volatile.

• Gold Industry Concentration. The gold industry can be significantly affected by international monetary and political developments such as currency devaluations or revaluations, central bank movements, economic and social conditions within a country, trade imbalances, or trade or currency restrictions between countries, as well as supply and demand for gold and operational costs associated with mining.

• Subsidiary Risk. Investment in an unregistered subsidiary is not subject to the investor protections of the Investment Company Act of 1940 (1940 Act) and is subject to the risks associated with the gold industry. Changes in tax and other laws could negatively affect investments in the subsidiary.

• Issuer-Specific Changes. The value of an individual security or particular type of security can be more volatile than, and can perform differently from, the market as a whole. The value of securities of smaller issuers can be more volatile than that of larger issuers.

In addition, the fund is considered non-diversified and can invest a greater portion of assets in securities of a smaller number of individual issuers than a diversified fund. As a result, changes in the market value of a single investment could cause greater fluctuations in share price than would occur in a more diversified fund.

An investment in the fund is not a deposit of a bank and is not insured or guaranteed by the Federal Deposit Insurance Corporation or any other government agency. You could lose money by investing in the fund.

Risk Lose Money [Text]

rr_RiskLoseMoney

You could lose money by investing in the fund.

Risk Nondiversified Status [Text]

rr_RiskNondiversifiedStatus

In addition, the fund is considered non-diversified and can invest a greater portion of assets in securities of a smaller number of individual issuers than a diversified fund. As a result, changes in the market value of a single investment could cause greater fluctuations in share price than would occur in a more diversified fund.

Risk Not Insured Depository Institution [Text]

rr_RiskNotInsuredDepositoryInstitution

An investment in the fund is not a deposit of a bank and is not insured or guaranteed by the Federal Deposit Insurance Corporation or any other government agency.

Bar Chart and Performance Table [Heading]

rr_BarChartAndPerformanceTableHeading

Performance

Performance Narrative [Text Block]

rr_PerformanceNarrativeTextBlock

The following information is intended to help you understand the risks of investing in the fund. The information illustrates the changes in the performance of the fund's shares from year to year and compares the performance of the fund's shares to the performance of a securities market index and an additional index over various periods of time. The indexes have characteristics relevant to the fund's investment strategies. Index descriptions appear in the Additional Index Information section of the prospectus. Past performance (before and after taxes) is not an indication of future performance.

Visit www.fidelity.com for more recent performance information.

Performance Information Illustrates Variability of Returns [Text]

rr_PerformanceInformationIllustratesVariabilityOfReturns

The information illustrates the changes in the performance of the fund's shares from year to year and compares the performance of the fund's shares to the performance of a securities market index and an additional index over various periods of time.

Performance Availability Website Address [Text]

rr_PerformanceAvailabilityWebSiteAddress

www.fidelity.com

Performance Past Does Not Indicate Future [Text]

rr_PerformancePastDoesNotIndicateFuture

Past performance (before and after taxes) is not an indication of future performance.

Bar Chart [Heading]

rr_BarChartHeading

Year-by-Year Returns

Calendar Years

Bar Chart Closing [Text Block]

rr_BarChartClosingTextBlock

During the periods shown in the chart:	Returns	Quarter ended
Highest Quarter Return	41.04%	March 31, 2016
Lowest Quarter Return	-37.37%	June 30, 2013
Year-to-Date Return	9.71%	March 31, 2017

Performance Table Heading

rr_PerformanceTableHeading

Average Annual Returns

Performance Table Uses Highest Federal Rate

rr_PerformanceTableUsesHighestFederalRate

After-tax returns are calculated using the historical highest individual federal marginal income tax rates, but do not reflect the impact of state or local taxes.

Performance Table Not Relevant to Tax Deferred

rr_PerformanceTableNotRelevantToTaxDeferred

The after-tax returns shown are not relevant if you hold your shares in a retirement account or in another tax-deferred arrangement, such as an employee benefit plan (profit sharing, 401(k), or 403(b) plan).

Performance Table Explanation after Tax Higher

rr_PerformanceTableExplanationAfterTaxHigher

Return After Taxes on Distributions and Sale of Fund Shares may be higher than other returns for the same period due to a tax benefit of realizing a capital loss upon the sale of fund shares.

Performance Table Narrative

rr_PerformanceTableNarrativeTextBlock

After-tax returns are calculated using the historical highest individual federal marginal income tax rates, but do not reflect the impact of state or local taxes. Actual after-tax returns may differ depending on your individual circumstances. The after-tax returns shown are not relevant if you hold your shares in a retirement account or in another tax-deferred arrangement, such as an employee benefit plan (profit sharing, 401(k), or 403(b) plan). Return After Taxes on Distributions and Sale of Fund Shares may be higher than other returns for the same period due to a tax benefit of realizing a capital loss upon the sale of fund shares.

For the periods ended December 31, 2016

02.28 Select Portfolios: Group 8 Materials Sector Retail Combo PRO-06 | Gold Portfolio | Gold Portfolio-Retail Class

Risk/Return:

rr_RiskReturnAbstract

Management fee

rr_ManagementFeesOverAssets

0.55%

Distribution and/or Service (12b-1) fees

rr_DistributionAndService12b1FeesOverAssets

none

Other expenses

rr_OtherExpensesOverAssets

0.28%

Acquired fund fees and expenses

rr_AcquiredFundFeesAndExpensesOverAssets

0.04%

^[1]

Total annual operating expenses

rr_ExpensesOverAssets

0.87%

Fee waiver and/or expense reimbursement

rr_FeeWaiverOrReimbursementOverAssets

0.03%

^[1]

Total annual operating expenses after fee waiver and/or expense reimbursement

rr_NetExpensesOverAssets

0.84%

1 year

rr_ExpenseExampleYear01

$ 86

3 years

rr_ExpenseExampleYear03

268

5 years

rr_ExpenseExampleYear05

466

10 years

rr_ExpenseExampleYear10

$ 1,037

2007

rr_AnnualReturn2007

24.93%

2008

rr_AnnualReturn2008

(20.49%)

2009

rr_AnnualReturn2009

38.00%

2010

rr_AnnualReturn2010

35.25%

2011

rr_AnnualReturn2011

(16.34%)

2012

rr_AnnualReturn2012

(12.43%)

2013

rr_AnnualReturn2013

(51.41%)

2014

rr_AnnualReturn2014

(8.51%)

2015

rr_AnnualReturn2015

(17.88%)

2016

rr_AnnualReturn2016

47.28%

Year to Date Return, Label

rr_YearToDateReturnLabel

Year-to-Date Return

Bar Chart, Year to Date Return, Date

rr_BarChartYearToDateReturnDate

Mar. 31, 2017

Bar Chart, Year to Date Return

rr_BarChartYearToDateReturn

9.71%

Highest Quarterly Return, Label

rr_HighestQuarterlyReturnLabel

Highest Quarter Return

Highest Quarterly Return, Date

rr_BarChartHighestQuarterlyReturnDate

Mar. 31, 2016

Highest Quarterly Return

rr_BarChartHighestQuarterlyReturn

41.04%

Lowest Quarterly Return, Label

rr_LowestQuarterlyReturnLabel

Lowest Quarter Return

Lowest Quarterly Return, Date

rr_BarChartLowestQuarterlyReturnDate

Jun. 30, 2013

Lowest Quarterly Return

rr_BarChartLowestQuarterlyReturn

(37.37%)

02.28 Select Portfolios: Group 8 Materials Sector Retail Combo PRO-06 | Gold Portfolio | Return Before Taxes | Gold Portfolio-Retail Class

Risk/Return:

rr_RiskReturnAbstract

Column

rr_AverageAnnualReturnColumnName

Gold Portfolio

Label

rr_AverageAnnualReturnLabel

Return Before Taxes

Past 1 year

rr_AverageAnnualReturnYear01

47.28%

Past 5 years

rr_AverageAnnualReturnYear05

(13.99%)

Past 10 years

rr_AverageAnnualReturnYear10

(3.10%)

02.28 Select Portfolios: Group 8 Materials Sector Retail Combo PRO-06 | Gold Portfolio | After Taxes on Distributions | Gold Portfolio-Retail Class

Risk/Return:

rr_RiskReturnAbstract

Column

rr_AverageAnnualReturnColumnName

Gold Portfolio

Label

rr_AverageAnnualReturnLabel

Return After Taxes on Distributions

Past 1 year

rr_AverageAnnualReturnYear01

45.19%

Past 5 years

rr_AverageAnnualReturnYear05

(14.23%)

Past 10 years

rr_AverageAnnualReturnYear10

(3.89%)

02.28 Select Portfolios: Group 8 Materials Sector Retail Combo PRO-06 | Gold Portfolio | After Taxes on Distributions and Sales | Gold Portfolio-Retail Class

Risk/Return:

rr_RiskReturnAbstract

Column

rr_AverageAnnualReturnColumnName

Gold Portfolio

Label

rr_AverageAnnualReturnLabel

Return After Taxes on Distributions and Sale of Fund Shares

Past 1 year

rr_AverageAnnualReturnYear01

26.93%

Past 5 years

rr_AverageAnnualReturnYear05

(9.89%)

Past 10 years

rr_AverageAnnualReturnYear10

(1.88%)

02.28 Select Portfolios: Group 8 Materials Sector Retail Combo PRO-06 | Gold Portfolio | S&P 500® Index(reflects no deduction for fees, expenses, or taxes)

Risk/Return:

rr_RiskReturnAbstract

Past 1 year

rr_AverageAnnualReturnYear01

11.96%

Past 5 years

rr_AverageAnnualReturnYear05

14.66%

Past 10 years

rr_AverageAnnualReturnYear10

6.95%

02.28 Select Portfolios: Group 8 Materials Sector Retail Combo PRO-06 | Gold Portfolio | S&P® Global BMI Gold Capped Index(reflects no deduction for fees, expenses, or taxes)

Risk/Return:

rr_RiskReturnAbstract

Past 1 year

rr_AverageAnnualReturnYear01

58.24%

Past 5 years

rr_AverageAnnualReturnYear05

(14.10%)

Past 10 years

rr_AverageAnnualReturnYear10

(4.20%)

[1] The fund may invest in a wholly-owned subsidiary. The subsidiary has entered into a separate contract with Fidelity Management & Research Company (FMR), an affiliate of Fidelity SelectCo, LLC (SelectCo), the fund's investment adviser, for the management of its portfolio pursuant to which the subsidiary pays FMR a fee at an annual rate of 0.30% of its net assets. The subsidiary also pays certain other expenses including custody fees. SelectCo has contractually agreed to waive the fund's management fee in an amount equal to the management fee paid to FMR by the subsidiary. This arrangement will remain in effect for at least one year from the effective date of the prospectus, and will remain in effect thereafter as long as FMR's contract with the subsidiary is in place. If FMR's contract with the subsidiary is terminated, SelectCo, in its sole discretion, may discontinue the arrangement.

XML

02.28 Select Portfolios: Group 8 Materials Sector Retail Combo PRO-06 | Materials Portfolio

Fund Summary

Fund/Class:
Materials Portfolio/Materials Portfolio

Investment Objective

The fund seeks capital appreciation.

Fee Table

The following table describes the fees and expenses that may be incurred when you buy and hold shares of the fund.

Shareholder fees

Shareholder Fees {- Materials Portfolio}	02.28 Select Portfolios: Group 8 Materials Sector Retail Combo PRO-06 Materials Portfolio USD ($)
(fees paid directly from your investment)	none

Annual Operating Expenses

(expenses that you pay each year as a % of the value of your investment)

Annual Operating Expenses {- Materials Portfolio}	02.28 Select Portfolios: Group 8 Materials Sector Retail Combo PRO-06 Materials Portfolio Materials Portfolio-Retail Class
Management fee	0.55%
Distribution and/or Service (12b-1) fees	none
Other expenses	0.26%
Total annual operating expenses	0.81%

This example helps compare the cost of investing in the fund with the cost of investing in other funds.

Let's say, hypothetically, that the annual return for shares of the fund is 5% and that your shareholder fees and the annual operating expenses for shares of the fund are exactly as described in the fee table. This example illustrates the effect of fees and expenses, but is not meant to suggest actual or expected fees and expenses or returns, all of which may vary. For every $10,000 you invested, here's how much you would pay in total expenses if you sell all of your shares at the end of each time period indicated:

Sell All Shares

Expense Example {- Materials Portfolio}	02.28 Select Portfolios: Group 8 Materials Sector Retail Combo PRO-06 Materials Portfolio Materials Portfolio-Retail Class USD ($)
1 year	$ 83
3 years	259
5 years	450
10 years	$ 1,002

Portfolio Turnover

The fund pays transaction costs, such as commissions, when it buys and sells securities (or "turns over" its portfolio). A higher portfolio turnover rate may indicate higher transaction costs and may result in higher taxes when fund shares are held in a taxable account. These costs, which are not reflected in annual operating expenses or in the example, affect the fund's performance. During the most recent fiscal year, the fund's portfolio turnover rate was 49% of the average value of its portfolio.

Principal Investment Strategies

• Normally investing primarily in common stocks.

• Normally investing at least 80% of assets in securities of companies principally engaged in the manufacture, mining, processing, or distribution of raw materials and intermediate goods.

• Investing in domestic and foreign issuers.

• Using fundamental analysis of factors such as each issuer's financial condition and industry position, as well as market and economic conditions, to select investments.

Principal Investment Risks

• Stock Market Volatility. Stock markets are volatile and can decline significantly in response to adverse issuer, political, regulatory, market, or economic developments. Different parts of the market, including different market sectors, and different types of securities can react differently to these developments.

• Foreign Exposure. Foreign markets can be more volatile than the U.S. market due to increased risks of adverse issuer, political, regulatory, market, or economic developments and can perform differently from the U.S. market.

• Materials Industry Concentration. The materials industries can be significantly affected by the level and volatility of commodity prices, the exchange value of the dollar, import and export controls, worldwide competition, liability for environmental damage, depletion of resources, and mandated expenditures for safety and pollution control.

• Issuer-Specific Changes. The value of an individual security or particular type of security can be more volatile than, and can perform differently from, the market as a whole. The value of securities of smaller issuers can be more volatile than that of larger issuers.

In addition, the fund is considered non-diversified and can invest a greater portion of assets in securities of a smaller number of individual issuers than a diversified fund. As a result, changes in the market value of a single investment could cause greater fluctuations in share price than would occur in a more diversified fund.

An investment in the fund is not a deposit of a bank and is not insured or guaranteed by the Federal Deposit Insurance Corporation or any other government agency. You could lose money by investing in the fund.

Performance

The following information is intended to help you understand the risks of investing in the fund. The information illustrates the changes in the performance of the fund's shares from year to year and compares the performance of the fund's shares to the performance of a securities market index and an additional index over various periods of time. The indexes have characteristics relevant to the fund's investment strategies. Index descriptions appear in the Additional Index Information section of the prospectus. Past performance (before and after taxes) is not an indication of future performance.

Visit www.fidelity.com for more recent performance information.

Year-by-Year Returns

Calendar Years

During the periods shown in the chart:	Returns	Quarter ended
Highest Quarter Return	26.47%	September 30, 2009
Lowest Quarter Return	-30.14%	December 31, 2008
Year-to-Date Return	7.71%	March 31, 2017

Average Annual Returns

After-tax returns are calculated using the historical highest individual federal marginal income tax rates, but do not reflect the impact of state or local taxes. Actual after-tax returns may differ depending on your individual circumstances. The after-tax returns shown are not relevant if you hold your shares in a retirement account or in another tax-deferred arrangement, such as an employee benefit plan (profit sharing, 401(k), or 403(b) plan).

For the periods ended December 31, 2016

Average Annual Total Returns{- Materials Portfolio} - 02.28 Select Portfolios: Group 8 Materials Sector Retail Combo PRO-06 - Materials Portfolio	Past 1 year	Past 5 years	Past 10 years
Materials Portfolio-Retail Class | Return Before Taxes	11.99%	8.41%	7.86%
Materials Portfolio-Retail Class | After Taxes on Distributions	11.71%	7.51%	7.25%
Materials Portfolio-Retail Class | After Taxes on Distributions and Sales	7.02%	6.64%	6.41%
S&P 500® Index(reflects no deduction for fees, expenses, or taxes)	11.96%	14.66%	6.95%
MSCI U.S. IMI Materials 25-50 Index(reflects no deduction for fees, expenses, or taxes)	21.53%	11.22%	7.01%

XML

Label

Element

Value

Risk/Return:

rr_RiskReturnAbstract

Registrant Name

dei_EntityRegistrantName

FIDELITY SELECT PORTFOLIOS

Prospectus Date

rr_ProspectusDate

Apr. 29, 2017

02.28 Select Portfolios: Group 8 Materials Sector Retail Combo PRO-06 | Materials Portfolio

Risk/Return:

rr_RiskReturnAbstract

Risk/Return [Heading]

rr_RiskReturnHeading

Fund Summary

Fund/Class:
Materials Portfolio/Materials Portfolio

Objective [Heading]

rr_ObjectiveHeading

Investment Objective

Objective, Primary [Text Block]

rr_ObjectivePrimaryTextBlock

The fund seeks capital appreciation.

Expense [Heading]

rr_ExpenseHeading

Fee Table

Expense Narrative [Text Block]

rr_ExpenseNarrativeTextBlock

The following table describes the fees and expenses that may be incurred when you buy and hold shares of the fund.

Shareholder Fees Caption [Text]

rr_ShareholderFeesCaption

Shareholder fees

(fees paid directly from your investment)

rr_ShareholderFeeOther

none

Operating Expenses Caption [Text]

rr_OperatingExpensesCaption

Annual Operating Expenses

(expenses that you pay each year as a % of the value of your investment)

Portfolio Turnover [Heading]

rr_PortfolioTurnoverHeading

Portfolio Turnover

Portfolio Turnover [Text Block]

rr_PortfolioTurnoverTextBlock

The fund pays transaction costs, such as commissions, when it buys and sells securities (or "turns over" its portfolio). A higher portfolio turnover rate may indicate higher transaction costs and may result in higher taxes when fund shares are held in a taxable account. These costs, which are not reflected in annual operating expenses or in the example, affect the fund's performance. During the most recent fiscal year, the fund's portfolio turnover rate was 49% of the average value of its portfolio.

Portfolio Turnover, Rate

rr_PortfolioTurnoverRate

49.00%

Expense Example Narrative [Text Block]

rr_ExpenseExampleNarrativeTextBlock

This example helps compare the cost of investing in the fund with the cost of investing in other funds.

Let's say, hypothetically, that the annual return for shares of the fund is 5% and that your shareholder fees and the annual operating expenses for shares of the fund are exactly as described in the fee table. This example illustrates the effect of fees and expenses, but is not meant to suggest actual or expected fees and expenses or returns, all of which may vary. For every $10,000 you invested, here's how much you would pay in total expenses if you sell all of your shares at the end of each time period indicated:

Expense Example by, Year, Caption [Text]

rr_ExpenseExampleByYearCaption

Sell All Shares

Strategy [Heading]

rr_StrategyHeading

Principal Investment Strategies

Strategy Narrative [Text Block]

rr_StrategyNarrativeTextBlock

• Normally investing primarily in common stocks.

• Normally investing at least 80% of assets in securities of companies principally engaged in the manufacture, mining, processing, or distribution of raw materials and intermediate goods.

• Investing in domestic and foreign issuers.

• Using fundamental analysis of factors such as each issuer's financial condition and industry position, as well as market and economic conditions, to select investments.

Strategy Portfolio Concentration [Text]

rr_StrategyPortfolioConcentration

Normally investing at least 80% of assets in securities of companies principally engaged in the manufacture, mining, processing, or distribution of raw materials and intermediate goods.

Risk [Heading]

rr_RiskHeading

Principal Investment Risks

Risk Narrative [Text Block]

rr_RiskNarrativeTextBlock

• Stock Market Volatility. Stock markets are volatile and can decline significantly in response to adverse issuer, political, regulatory, market, or economic developments. Different parts of the market, including different market sectors, and different types of securities can react differently to these developments.

• Foreign Exposure. Foreign markets can be more volatile than the U.S. market due to increased risks of adverse issuer, political, regulatory, market, or economic developments and can perform differently from the U.S. market.

• Materials Industry Concentration. The materials industries can be significantly affected by the level and volatility of commodity prices, the exchange value of the dollar, import and export controls, worldwide competition, liability for environmental damage, depletion of resources, and mandated expenditures for safety and pollution control.

• Issuer-Specific Changes. The value of an individual security or particular type of security can be more volatile than, and can perform differently from, the market as a whole. The value of securities of smaller issuers can be more volatile than that of larger issuers.

In addition, the fund is considered non-diversified and can invest a greater portion of assets in securities of a smaller number of individual issuers than a diversified fund. As a result, changes in the market value of a single investment could cause greater fluctuations in share price than would occur in a more diversified fund.

An investment in the fund is not a deposit of a bank and is not insured or guaranteed by the Federal Deposit Insurance Corporation or any other government agency. You could lose money by investing in the fund.

Risk Lose Money [Text]

rr_RiskLoseMoney

You could lose money by investing in the fund.

Risk Nondiversified Status [Text]

rr_RiskNondiversifiedStatus

In addition, the fund is considered non-diversified and can invest a greater portion of assets in securities of a smaller number of individual issuers than a diversified fund. As a result, changes in the market value of a single investment could cause greater fluctuations in share price than would occur in a more diversified fund.

Risk Not Insured Depository Institution [Text]

rr_RiskNotInsuredDepositoryInstitution

An investment in the fund is not a deposit of a bank and is not insured or guaranteed by the Federal Deposit Insurance Corporation or any other government agency.

Bar Chart and Performance Table [Heading]

rr_BarChartAndPerformanceTableHeading

Performance

Performance Narrative [Text Block]

rr_PerformanceNarrativeTextBlock

The following information is intended to help you understand the risks of investing in the fund. The information illustrates the changes in the performance of the fund's shares from year to year and compares the performance of the fund's shares to the performance of a securities market index and an additional index over various periods of time. The indexes have characteristics relevant to the fund's investment strategies. Index descriptions appear in the Additional Index Information section of the prospectus. Past performance (before and after taxes) is not an indication of future performance.

Visit www.fidelity.com for more recent performance information.

Performance Information Illustrates Variability of Returns [Text]

rr_PerformanceInformationIllustratesVariabilityOfReturns

The information illustrates the changes in the performance of the fund's shares from year to year and compares the performance of the fund's shares to the performance of a securities market index and an additional index over various periods of time.

Performance Availability Website Address [Text]

rr_PerformanceAvailabilityWebSiteAddress

www.fidelity.com

Performance Past Does Not Indicate Future [Text]

rr_PerformancePastDoesNotIndicateFuture

Past performance (before and after taxes) is not an indication of future performance.

Bar Chart [Heading]

rr_BarChartHeading

Year-by-Year Returns

Calendar Years

Bar Chart Closing [Text Block]

rr_BarChartClosingTextBlock

During the periods shown in the chart:	Returns	Quarter ended
Highest Quarter Return	26.47%	September 30, 2009
Lowest Quarter Return	-30.14%	December 31, 2008
Year-to-Date Return	7.71%	March 31, 2017

Performance Table Heading

rr_PerformanceTableHeading

Average Annual Returns

Performance Table Uses Highest Federal Rate

rr_PerformanceTableUsesHighestFederalRate

After-tax returns are calculated using the historical highest individual federal marginal income tax rates, but do not reflect the impact of state or local taxes.

Performance Table Not Relevant to Tax Deferred

rr_PerformanceTableNotRelevantToTaxDeferred

The after-tax returns shown are not relevant if you hold your shares in a retirement account or in another tax-deferred arrangement, such as an employee benefit plan (profit sharing, 401(k), or 403(b) plan).

Performance Table Narrative

rr_PerformanceTableNarrativeTextBlock

After-tax returns are calculated using the historical highest individual federal marginal income tax rates, but do not reflect the impact of state or local taxes. Actual after-tax returns may differ depending on your individual circumstances. The after-tax returns shown are not relevant if you hold your shares in a retirement account or in another tax-deferred arrangement, such as an employee benefit plan (profit sharing, 401(k), or 403(b) plan).

For the periods ended December 31, 2016

02.28 Select Portfolios: Group 8 Materials Sector Retail Combo PRO-06 | Materials Portfolio | Materials Portfolio-Retail Class

Risk/Return:

rr_RiskReturnAbstract

Management fee

rr_ManagementFeesOverAssets

0.55%

Distribution and/or Service (12b-1) fees

rr_DistributionAndService12b1FeesOverAssets

none

Other expenses

rr_OtherExpensesOverAssets

0.26%

Total annual operating expenses

rr_ExpensesOverAssets

0.81%

1 year

rr_ExpenseExampleYear01

$ 83

3 years

rr_ExpenseExampleYear03

259

5 years

rr_ExpenseExampleYear05

450

10 years

rr_ExpenseExampleYear10

$ 1,002

2007

rr_AnnualReturn2007

29.21%

2008

rr_AnnualReturn2008

(47.56%)

2009

rr_AnnualReturn2009

78.68%

2010

rr_AnnualReturn2010

28.09%

2011

rr_AnnualReturn2011

(8.20%)

2012

rr_AnnualReturn2012

20.17%

2013

rr_AnnualReturn2013

21.90%

2014

rr_AnnualReturn2014

(0.06%)

2015

rr_AnnualReturn2015

(8.68%)

2016

rr_AnnualReturn2016

11.99%

Year to Date Return, Label

rr_YearToDateReturnLabel

Year-to-Date Return

Bar Chart, Year to Date Return, Date

rr_BarChartYearToDateReturnDate

Mar. 31, 2017

Bar Chart, Year to Date Return

rr_BarChartYearToDateReturn

7.71%

Highest Quarterly Return, Label

rr_HighestQuarterlyReturnLabel

Highest Quarter Return

Highest Quarterly Return, Date

rr_BarChartHighestQuarterlyReturnDate

Sep. 30, 2009

Highest Quarterly Return

rr_BarChartHighestQuarterlyReturn

26.47%

Lowest Quarterly Return, Label

rr_LowestQuarterlyReturnLabel

Lowest Quarter Return

Lowest Quarterly Return, Date

rr_BarChartLowestQuarterlyReturnDate

Dec. 31, 2008

Lowest Quarterly Return

rr_BarChartLowestQuarterlyReturn

(30.14%)

02.28 Select Portfolios: Group 8 Materials Sector Retail Combo PRO-06 | Materials Portfolio | Return Before Taxes | Materials Portfolio-Retail Class

Risk/Return:

rr_RiskReturnAbstract

Column

rr_AverageAnnualReturnColumnName

Materials Portfolio

Label

rr_AverageAnnualReturnLabel

Return Before Taxes

Past 1 year

rr_AverageAnnualReturnYear01

11.99%

Past 5 years

rr_AverageAnnualReturnYear05

8.41%

Past 10 years

rr_AverageAnnualReturnYear10

7.86%

02.28 Select Portfolios: Group 8 Materials Sector Retail Combo PRO-06 | Materials Portfolio | After Taxes on Distributions | Materials Portfolio-Retail Class

Risk/Return:

rr_RiskReturnAbstract

Column

rr_AverageAnnualReturnColumnName

Materials Portfolio

Label

rr_AverageAnnualReturnLabel

Return After Taxes on Distributions

Past 1 year

rr_AverageAnnualReturnYear01

11.71%

Past 5 years

rr_AverageAnnualReturnYear05

7.51%

Past 10 years

rr_AverageAnnualReturnYear10

7.25%

02.28 Select Portfolios: Group 8 Materials Sector Retail Combo PRO-06 | Materials Portfolio | After Taxes on Distributions and Sales | Materials Portfolio-Retail Class

Risk/Return:

rr_RiskReturnAbstract

Column

rr_AverageAnnualReturnColumnName

Materials Portfolio

Label

rr_AverageAnnualReturnLabel

Return After Taxes on Distributions and Sale of Fund Shares

Past 1 year

rr_AverageAnnualReturnYear01

7.02%

Past 5 years

rr_AverageAnnualReturnYear05

6.64%

Past 10 years

rr_AverageAnnualReturnYear10

6.41%

02.28 Select Portfolios: Group 8 Materials Sector Retail Combo PRO-06 | Materials Portfolio | S&P 500® Index(reflects no deduction for fees, expenses, or taxes)

Risk/Return:

rr_RiskReturnAbstract

Past 1 year

rr_AverageAnnualReturnYear01

11.96%

Past 5 years

rr_AverageAnnualReturnYear05

14.66%

Past 10 years

rr_AverageAnnualReturnYear10

6.95%

02.28 Select Portfolios: Group 8 Materials Sector Retail Combo PRO-06 | Materials Portfolio | MSCI U.S. IMI Materials 25-50 Index(reflects no deduction for fees, expenses, or taxes)

Risk/Return:

rr_RiskReturnAbstract

Past 1 year

rr_AverageAnnualReturnYear01

21.53%

Past 5 years

rr_AverageAnnualReturnYear05

11.22%

Past 10 years

rr_AverageAnnualReturnYear10

7.01%

XML

02.28 Select Portfolios: Group 5 Health Care Sector Combo PRO-05 | Biotechnology Portfolio

Fund Summary

Fund:
Biotechnology Portfolio

Investment Objective

The fund seeks capital appreciation.

Fee Table

The following table describes the fees and expenses that may be incurred when you buy and hold shares of the fund.

Shareholder fees

Shareholder Fees {- Biotechnology Portfolio}	02.28 Select Portfolios: Group 5 Health Care Sector Combo PRO-05 Biotechnology Portfolio USD ($)
(fees paid directly from your investment)	none

Annual Operating Expenses

(expenses that you pay each year as a % of the value of your investment)

Annual Operating Expenses {- Biotechnology Portfolio}	02.28 Select Portfolios: Group 5 Health Care Sector Combo PRO-05 Biotechnology Portfolio Biotechnology Portfolio-Default
Management fee	0.55%
Distribution and/or Service (12b-1) fees	none
Other expenses	0.20%
Total annual operating expenses	0.75%

This example helps compare the cost of investing in the fund with the cost of investing in other funds.

Let's say, hypothetically, that the annual return for shares of the fund is 5% and that your shareholder fees and the annual operating expenses for shares of the fund are exactly as described in the fee table. This example illustrates the effect of fees and expenses, but is not meant to suggest actual or expected fees and expenses or returns, all of which may vary. For every $10,000 you invested, here's how much you would pay in total expenses if you sell all of your shares at the end of each time period indicated:

Sell All Shares

Expense Example {- Biotechnology Portfolio}	02.28 Select Portfolios: Group 5 Health Care Sector Combo PRO-05 Biotechnology Portfolio Biotechnology Portfolio-Default USD ($)
1 year	$ 77
3 years	240
5 years	417
10 years	$ 930

Portfolio Turnover

The fund pays transaction costs, such as commissions, when it buys and sells securities (or "turns over" its portfolio). A higher portfolio turnover rate may indicate higher transaction costs and may result in higher taxes when fund shares are held in a taxable account. These costs, which are not reflected in annual operating expenses or in the example, affect the fund's performance. During the most recent fiscal year, the fund's portfolio turnover rate was 28% of the average value of its portfolio.

Principal Investment Strategies

• Normally investing primarily in common stocks.

• Normally investing at least 80% of assets in securities of companies principally engaged in the research, development, manufacture, and distribution of various biotechnological products, services, and processes and companies that benefit significantly from scientific and technological advances in biotechnology.

• Investing in domestic and foreign issuers.

• Using fundamental analysis of factors such as each issuer's financial condition and industry position, as well as market and economic conditions, to select investments.

Principal Investment Risks

• Stock Market Volatility. Stock markets are volatile and can decline significantly in response to adverse issuer, political, regulatory, market, or economic developments. Different parts of the market, including different market sectors, and different types of securities can react differently to these developments.

• Foreign Exposure. Foreign markets can be more volatile than the U.S. market due to increased risks of adverse issuer, political, regulatory, market, or economic developments and can perform differently from the U.S. market.

• Biotechnology Industry Concentration. The biotechnology industry can be significantly affected by patent considerations, intense competition, rapid technological change and obsolescence, and government regulation, and revenue patterns can be erratic.

• Issuer-Specific Changes. The value of an individual security or particular type of security can be more volatile than, and can perform differently from, the market as a whole. The value of securities of smaller issuers can be more volatile than that of larger issuers.

In addition, the fund is considered non-diversified and can invest a greater portion of assets in securities of a smaller number of individual issuers than a diversified fund. As a result, changes in the market value of a single investment could cause greater fluctuations in share price than would occur in a more diversified fund.

An investment in the fund is not a deposit of a bank and is not insured or guaranteed by the Federal Deposit Insurance Corporation or any other government agency. You could lose money by investing in the fund.

Performance

The following information is intended to help you understand the risks of investing in the fund. The information illustrates the changes in the performance of the fund's shares from year to year and compares the performance of the fund's shares to the performance of a securities market index and an additional index over various periods of time. The indexes have characteristics relevant to the fund's investment strategies. Index descriptions appear in the Additional Index Information section of the prospectus. Past performance (before and after taxes) is not an indication of future performance.

Visit www.fidelity.com for more recent performance information.

Year-by-Year Returns

Calendar Years

During the periods shown in the chart:	Returns	Quarter ended
Highest Quarter Return	23.79%	September 30, 2013
Lowest Quarter Return	-28.45%	March 31, 2016
Year-to-Date Return	15.79%	March 31, 2017

Average Annual Returns

After-tax returns are calculated using the historical highest individual federal marginal income tax rates, but do not reflect the impact of state or local taxes. Actual after-tax returns may differ depending on your individual circumstances. The after-tax returns shown are not relevant if you hold your shares in a retirement account or in another tax-deferred arrangement, such as an employee benefit plan (profit sharing, 401(k), or 403(b) plan). Return After Taxes on Distributions and Sale of Fund Shares may be higher than other returns for the same period due to a tax benefit of realizing a capital loss upon the sale of fund shares.

For the periods ended December 31, 2016

Average Annual Total Returns{- Biotechnology Portfolio} - 02.28 Select Portfolios: Group 5 Health Care Sector Combo PRO-05 - Biotechnology Portfolio	Past 1 year	Past 5 years	Past 10 years
Biotechnology Portfolio-Default | Return Before Taxes	(23.72%)	21.52%	13.40%
Biotechnology Portfolio-Default | After Taxes on Distributions	(24.32%)	20.11%	12.74%
Biotechnology Portfolio-Default | After Taxes on Distributions and Sales	(12.93%)	17.77%	11.35%
S&P 500® Index(reflects no deduction for fees, expenses, or taxes)	11.96%	14.66%	6.95%
MSCI U.S. IMI Biotechnology 25-50 Index(reflects no deduction for fees, expenses, or taxes)	(14.25%)	24.62%	14.98%

XML

Label

Element

Value

Risk/Return:

rr_RiskReturnAbstract

Registrant Name

dei_EntityRegistrantName

FIDELITY SELECT PORTFOLIOS

Prospectus Date

rr_ProspectusDate

Apr. 29, 2017

02.28 Select Portfolios: Group 5 Health Care Sector Combo PRO-05 | Biotechnology Portfolio

Risk/Return:

rr_RiskReturnAbstract

Risk/Return [Heading]

rr_RiskReturnHeading

Fund Summary

Fund:
Biotechnology Portfolio

Objective [Heading]

rr_ObjectiveHeading

Investment Objective

Objective, Primary [Text Block]

rr_ObjectivePrimaryTextBlock

The fund seeks capital appreciation.

Expense [Heading]

rr_ExpenseHeading

Fee Table

Expense Narrative [Text Block]

rr_ExpenseNarrativeTextBlock

The following table describes the fees and expenses that may be incurred when you buy and hold shares of the fund.

Shareholder Fees Caption [Text]

rr_ShareholderFeesCaption

Shareholder fees

(fees paid directly from your investment)

rr_ShareholderFeeOther

none

Operating Expenses Caption [Text]

rr_OperatingExpensesCaption

Annual Operating Expenses

(expenses that you pay each year as a % of the value of your investment)

Portfolio Turnover [Heading]

rr_PortfolioTurnoverHeading

Portfolio Turnover

Portfolio Turnover [Text Block]

rr_PortfolioTurnoverTextBlock

The fund pays transaction costs, such as commissions, when it buys and sells securities (or "turns over" its portfolio). A higher portfolio turnover rate may indicate higher transaction costs and may result in higher taxes when fund shares are held in a taxable account. These costs, which are not reflected in annual operating expenses or in the example, affect the fund's performance. During the most recent fiscal year, the fund's portfolio turnover rate was 28% of the average value of its portfolio.

Portfolio Turnover, Rate

rr_PortfolioTurnoverRate

28.00%

Expense Example Narrative [Text Block]

rr_ExpenseExampleNarrativeTextBlock

This example helps compare the cost of investing in the fund with the cost of investing in other funds.

Let's say, hypothetically, that the annual return for shares of the fund is 5% and that your shareholder fees and the annual operating expenses for shares of the fund are exactly as described in the fee table. This example illustrates the effect of fees and expenses, but is not meant to suggest actual or expected fees and expenses or returns, all of which may vary. For every $10,000 you invested, here's how much you would pay in total expenses if you sell all of your shares at the end of each time period indicated:

Expense Example by, Year, Caption [Text]

rr_ExpenseExampleByYearCaption

Sell All Shares

Strategy [Heading]

rr_StrategyHeading

Principal Investment Strategies

Strategy Narrative [Text Block]

rr_StrategyNarrativeTextBlock

• Normally investing primarily in common stocks.

• Normally investing at least 80% of assets in securities of companies principally engaged in the research, development, manufacture, and distribution of various biotechnological products, services, and processes and companies that benefit significantly from scientific and technological advances in biotechnology.

• Investing in domestic and foreign issuers.

• Using fundamental analysis of factors such as each issuer's financial condition and industry position, as well as market and economic conditions, to select investments.

Strategy Portfolio Concentration [Text]

rr_StrategyPortfolioConcentration

Normally investing at least 80% of assets in securities of companies principally engaged in the research, development, manufacture, and distribution of various biotechnological products, services, and processes and companies that benefit significantly from scientific and technological advances in biotechnology.

Risk [Heading]

rr_RiskHeading

Principal Investment Risks

Risk Narrative [Text Block]

rr_RiskNarrativeTextBlock

• Stock Market Volatility. Stock markets are volatile and can decline significantly in response to adverse issuer, political, regulatory, market, or economic developments. Different parts of the market, including different market sectors, and different types of securities can react differently to these developments.

• Foreign Exposure. Foreign markets can be more volatile than the U.S. market due to increased risks of adverse issuer, political, regulatory, market, or economic developments and can perform differently from the U.S. market.

• Biotechnology Industry Concentration. The biotechnology industry can be significantly affected by patent considerations, intense competition, rapid technological change and obsolescence, and government regulation, and revenue patterns can be erratic.

• Issuer-Specific Changes. The value of an individual security or particular type of security can be more volatile than, and can perform differently from, the market as a whole. The value of securities of smaller issuers can be more volatile than that of larger issuers.

In addition, the fund is considered non-diversified and can invest a greater portion of assets in securities of a smaller number of individual issuers than a diversified fund. As a result, changes in the market value of a single investment could cause greater fluctuations in share price than would occur in a more diversified fund.

An investment in the fund is not a deposit of a bank and is not insured or guaranteed by the Federal Deposit Insurance Corporation or any other government agency. You could lose money by investing in the fund.

Risk Lose Money [Text]

rr_RiskLoseMoney

You could lose money by investing in the fund.

Risk Nondiversified Status [Text]

rr_RiskNondiversifiedStatus

In addition, the fund is considered non-diversified and can invest a greater portion of assets in securities of a smaller number of individual issuers than a diversified fund. As a result, changes in the market value of a single investment could cause greater fluctuations in share price than would occur in a more diversified fund.

Risk Not Insured Depository Institution [Text]

rr_RiskNotInsuredDepositoryInstitution

An investment in the fund is not a deposit of a bank and is not insured or guaranteed by the Federal Deposit Insurance Corporation or any other government agency.

Bar Chart and Performance Table [Heading]

rr_BarChartAndPerformanceTableHeading

Performance

Performance Narrative [Text Block]

rr_PerformanceNarrativeTextBlock

The following information is intended to help you understand the risks of investing in the fund. The information illustrates the changes in the performance of the fund's shares from year to year and compares the performance of the fund's shares to the performance of a securities market index and an additional index over various periods of time. The indexes have characteristics relevant to the fund's investment strategies. Index descriptions appear in the Additional Index Information section of the prospectus. Past performance (before and after taxes) is not an indication of future performance.

Visit www.fidelity.com for more recent performance information.

Performance Information Illustrates Variability of Returns [Text]

rr_PerformanceInformationIllustratesVariabilityOfReturns

The information illustrates the changes in the performance of the fund's shares from year to year and compares the performance of the fund's shares to the performance of a securities market index and an additional index over various periods of time.

Performance Availability Website Address [Text]

rr_PerformanceAvailabilityWebSiteAddress

www.fidelity.com

Performance Past Does Not Indicate Future [Text]

rr_PerformancePastDoesNotIndicateFuture

Past performance (before and after taxes) is not an indication of future performance.

Bar Chart [Heading]

rr_BarChartHeading

Year-by-Year Returns

Calendar Years

Bar Chart Closing [Text Block]

rr_BarChartClosingTextBlock

During the periods shown in the chart:	Returns	Quarter ended
Highest Quarter Return	23.79%	September 30, 2013
Lowest Quarter Return	-28.45%	March 31, 2016
Year-to-Date Return	15.79%	March 31, 2017

Performance Table Heading

rr_PerformanceTableHeading

Average Annual Returns

Performance Table Uses Highest Federal Rate

rr_PerformanceTableUsesHighestFederalRate

After-tax returns are calculated using the historical highest individual federal marginal income tax rates, but do not reflect the impact of state or local taxes.

Performance Table Not Relevant to Tax Deferred

rr_PerformanceTableNotRelevantToTaxDeferred

The after-tax returns shown are not relevant if you hold your shares in a retirement account or in another tax-deferred arrangement, such as an employee benefit plan (profit sharing, 401(k), or 403(b) plan).

Performance Table Explanation after Tax Higher

rr_PerformanceTableExplanationAfterTaxHigher

Return After Taxes on Distributions and Sale of Fund Shares may be higher than other returns for the same period due to a tax benefit of realizing a capital loss upon the sale of fund shares.

Performance Table Narrative

rr_PerformanceTableNarrativeTextBlock

After-tax returns are calculated using the historical highest individual federal marginal income tax rates, but do not reflect the impact of state or local taxes. Actual after-tax returns may differ depending on your individual circumstances. The after-tax returns shown are not relevant if you hold your shares in a retirement account or in another tax-deferred arrangement, such as an employee benefit plan (profit sharing, 401(k), or 403(b) plan). Return After Taxes on Distributions and Sale of Fund Shares may be higher than other returns for the same period due to a tax benefit of realizing a capital loss upon the sale of fund shares.

For the periods ended December 31, 2016

02.28 Select Portfolios: Group 5 Health Care Sector Combo PRO-05 | Biotechnology Portfolio | Biotechnology Portfolio-Default

Risk/Return:

rr_RiskReturnAbstract

Management fee

rr_ManagementFeesOverAssets

0.55%

Distribution and/or Service (12b-1) fees

rr_DistributionAndService12b1FeesOverAssets

none

Other expenses

rr_OtherExpensesOverAssets

0.20%

Total annual operating expenses

rr_ExpensesOverAssets

0.75%

1 year

rr_ExpenseExampleYear01

$ 77

3 years

rr_ExpenseExampleYear03

240

5 years

rr_ExpenseExampleYear05

417

10 years

rr_ExpenseExampleYear10

$ 930

2007

rr_AnnualReturn2007

2.65%

2008

rr_AnnualReturn2008

(11.35%)

2009

rr_AnnualReturn2009

10.79%

2010

rr_AnnualReturn2010

11.41%

2011

rr_AnnualReturn2011

18.18%

2012

rr_AnnualReturn2012

36.59%

2013

rr_AnnualReturn2013

65.66%

2014

rr_AnnualReturn2014

35.05%

2015

rr_AnnualReturn2015

13.67%

2016

rr_AnnualReturn2016

(23.72%)

Year to Date Return, Label

rr_YearToDateReturnLabel

Year-to-Date Return

Bar Chart, Year to Date Return, Date

rr_BarChartYearToDateReturnDate

Mar. 31, 2017

Bar Chart, Year to Date Return

rr_BarChartYearToDateReturn

15.79%

Highest Quarterly Return, Label

rr_HighestQuarterlyReturnLabel

Highest Quarter Return

Highest Quarterly Return, Date

rr_BarChartHighestQuarterlyReturnDate

Sep. 30, 2013

Highest Quarterly Return

rr_BarChartHighestQuarterlyReturn

23.79%

Lowest Quarterly Return, Label

rr_LowestQuarterlyReturnLabel

Lowest Quarter Return

Lowest Quarterly Return, Date

rr_BarChartLowestQuarterlyReturnDate

Mar. 31, 2016

Lowest Quarterly Return

rr_BarChartLowestQuarterlyReturn

(28.45%)

02.28 Select Portfolios: Group 5 Health Care Sector Combo PRO-05 | Biotechnology Portfolio | Return Before Taxes | Biotechnology Portfolio-Default

Risk/Return:

rr_RiskReturnAbstract

Column

rr_AverageAnnualReturnColumnName

Biotechnology Portfolio

Label

rr_AverageAnnualReturnLabel

Return Before Taxes

Past 1 year

rr_AverageAnnualReturnYear01

(23.72%)

Past 5 years

rr_AverageAnnualReturnYear05

21.52%

Past 10 years

rr_AverageAnnualReturnYear10

13.40%

02.28 Select Portfolios: Group 5 Health Care Sector Combo PRO-05 | Biotechnology Portfolio | After Taxes on Distributions | Biotechnology Portfolio-Default

Risk/Return:

rr_RiskReturnAbstract

Column

rr_AverageAnnualReturnColumnName

Biotechnology Portfolio

Label

rr_AverageAnnualReturnLabel

Return After Taxes on Distributions

Past 1 year

rr_AverageAnnualReturnYear01

(24.32%)

Past 5 years

rr_AverageAnnualReturnYear05

20.11%

Past 10 years

rr_AverageAnnualReturnYear10

12.74%

02.28 Select Portfolios: Group 5 Health Care Sector Combo PRO-05 | Biotechnology Portfolio | After Taxes on Distributions and Sales | Biotechnology Portfolio-Default

Risk/Return:

rr_RiskReturnAbstract

Column

rr_AverageAnnualReturnColumnName

Biotechnology Portfolio

Label

rr_AverageAnnualReturnLabel

Return After Taxes on Distributions and Sale of Fund Shares

Past 1 year

rr_AverageAnnualReturnYear01

(12.93%)

Past 5 years

rr_AverageAnnualReturnYear05

17.77%

Past 10 years

rr_AverageAnnualReturnYear10

11.35%

02.28 Select Portfolios: Group 5 Health Care Sector Combo PRO-05 | Biotechnology Portfolio | S&P 500® Index(reflects no deduction for fees, expenses, or taxes)

Risk/Return:

rr_RiskReturnAbstract

Past 1 year

rr_AverageAnnualReturnYear01

11.96%

Past 5 years

rr_AverageAnnualReturnYear05

14.66%

Past 10 years

rr_AverageAnnualReturnYear10

6.95%

02.28 Select Portfolios: Group 5 Health Care Sector Combo PRO-05 | Biotechnology Portfolio | MSCI U.S. IMI Biotechnology 25-50 Index(reflects no deduction for fees, expenses, or taxes)

Risk/Return:

rr_RiskReturnAbstract

Past 1 year

rr_AverageAnnualReturnYear01

(14.25%)

Past 5 years

rr_AverageAnnualReturnYear05

24.62%

Past 10 years

rr_AverageAnnualReturnYear10

14.98%

XML

02.28 Select Portfolios: Group 5 Health Care Sector Combo PRO-05 | Health Care Portfolio

Fund Summary

Fund:
Health Care Portfolio

Investment Objective

The fund seeks capital appreciation.

Fee Table

The following table describes the fees and expenses that may be incurred when you buy and hold shares of the fund.

Shareholder fees

Shareholder Fees {- Health Care Portfolio}	02.28 Select Portfolios: Group 5 Health Care Sector Combo PRO-05 Health Care Portfolio USD ($)
(fees paid directly from your investment)	none

Annual Operating Expenses

(expenses that you pay each year as a % of the value of your investment)

Annual Operating Expenses {- Health Care Portfolio}	02.28 Select Portfolios: Group 5 Health Care Sector Combo PRO-05 Health Care Portfolio Health Care Portfolio-Default
Management fee	0.55%
Distribution and/or Service (12b-1) fees	none
Other expenses	0.19%
Total annual operating expenses	0.74%

This example helps compare the cost of investing in the fund with the cost of investing in other funds.

Let's say, hypothetically, that the annual return for shares of the fund is 5% and that your shareholder fees and the annual operating expenses for shares of the fund are exactly as described in the fee table. This example illustrates the effect of fees and expenses, but is not meant to suggest actual or expected fees and expenses or returns, all of which may vary. For every $10,000 you invested, here's how much you would pay in total expenses if you sell all of your shares at the end of each time period indicated:

Sell All Shares

Expense Example {- Health Care Portfolio}	02.28 Select Portfolios: Group 5 Health Care Sector Combo PRO-05 Health Care Portfolio Health Care Portfolio-Default USD ($)
1 year	$ 76
3 years	237
5 years	411
10 years	$ 918

Portfolio Turnover

The fund pays transaction costs, such as commissions, when it buys and sells securities (or "turns over" its portfolio). A higher portfolio turnover rate may indicate higher transaction costs and may result in higher taxes when fund shares are held in a taxable account. These costs, which are not reflected in annual operating expenses or in the example, affect the fund's performance. During the most recent fiscal year, the fund's portfolio turnover rate was 49% of the average value of its portfolio.

Principal Investment Strategies

• Normally investing primarily in common stocks.

• Normally investing at least 80% of assets in securities of companies principally engaged in the design, manufacture, or sale of products or services used for or in connection with health care or medicine.

• Investing in domestic and foreign issuers.

• Using fundamental analysis of factors such as each issuer's financial condition and industry position, as well as market and economic conditions, to select investments.

Principal Investment Risks

• Stock Market Volatility. Stock markets are volatile and can decline significantly in response to adverse issuer, political, regulatory, market, or economic developments. Different parts of the market, including different market sectors, and different types of securities can react differently to these developments.

• Foreign Exposure. Foreign markets can be more volatile than the U.S. market due to increased risks of adverse issuer, political, regulatory, market, or economic developments and can perform differently from the U.S. market.

• Health Care Industry Concentration. The health care industries are subject to government regulation and reimbursement rates, as well as government approval of products and services, which could have a significant effect on price and availability, and can be significantly affected by rapid obsolescence and patent expirations.

• Issuer-Specific Changes. The value of an individual security or particular type of security can be more volatile than, and can perform differently from, the market as a whole. The value of securities of smaller issuers can be more volatile than that of larger issuers.

In addition, the fund is considered non-diversified and can invest a greater portion of assets in securities of a smaller number of individual issuers than a diversified fund. As a result, changes in the market value of a single investment could cause greater fluctuations in share price than would occur in a more diversified fund.

An investment in the fund is not a deposit of a bank and is not insured or guaranteed by the Federal Deposit Insurance Corporation or any other government agency. You could lose money by investing in the fund.

Performance

The following information is intended to help you understand the risks of investing in the fund. The information illustrates the changes in the performance of the fund's shares from year to year and compares the performance of the fund's shares to the performance of a securities market index and an additional index over various periods of time. The indexes have characteristics relevant to the fund's investment strategies. Index descriptions appear in the Additional Index Information section of the prospectus. Past performance (before and after taxes) is not an indication of future performance.

Visit www.fidelity.com for more recent performance information.

Year-by-Year Returns

Calendar Years

During the periods shown in the chart:	Returns	Quarter ended
Highest Quarter Return	14.58%	March 31, 2013
Lowest Quarter Return	-18.09%	December 31, 2008
Year-to-Date Return	12.35%	March 31, 2017

Average Annual Returns

After-tax returns are calculated using the historical highest individual federal marginal income tax rates, but do not reflect the impact of state or local taxes. Actual after-tax returns may differ depending on your individual circumstances. The after-tax returns shown are not relevant if you hold your shares in a retirement account or in another tax-deferred arrangement, such as an employee benefit plan (profit sharing, 401(k), or 403(b) plan). Return After Taxes on Distributions and Sale of Fund Shares may be higher than other returns for the same period due to a tax benefit of realizing a capital loss upon the sale of fund shares.

For the periods ended December 31, 2016

Average Annual Total Returns{- Health Care Portfolio} - 02.28 Select Portfolios: Group 5 Health Care Sector Combo PRO-05 - Health Care Portfolio	Past 1 year	Past 5 years	Past 10 years
Health Care Portfolio-Default | Return Before Taxes	(10.68%)	19.13%	11.75%
Health Care Portfolio-Default | After Taxes on Distributions	(10.80%)	16.41%	10.02%
Health Care Portfolio-Default | After Taxes on Distributions and Sales	(5.93%)	15.08%	9.40%
S&P 500® Index(reflects no deduction for fees, expenses, or taxes)	11.96%	14.66%	6.95%
MSCI U.S. IMI Health Care 25-50 Index(reflects no deduction for fees, expenses, or taxes)	(3.26%)	17.26%	10.16%

XML

Label

Element

Value

Risk/Return:

rr_RiskReturnAbstract

Registrant Name

dei_EntityRegistrantName

FIDELITY SELECT PORTFOLIOS

Prospectus Date

rr_ProspectusDate

Apr. 29, 2017

02.28 Select Portfolios: Group 5 Health Care Sector Combo PRO-05 | Health Care Portfolio

Risk/Return:

rr_RiskReturnAbstract

Risk/Return [Heading]

rr_RiskReturnHeading

Fund Summary

Fund:
Health Care Portfolio

Objective [Heading]

rr_ObjectiveHeading

Investment Objective

Objective, Primary [Text Block]

rr_ObjectivePrimaryTextBlock

The fund seeks capital appreciation.

Expense [Heading]

rr_ExpenseHeading

Fee Table

Expense Narrative [Text Block]

rr_ExpenseNarrativeTextBlock

The following table describes the fees and expenses that may be incurred when you buy and hold shares of the fund.

Shareholder Fees Caption [Text]

rr_ShareholderFeesCaption

Shareholder fees

(fees paid directly from your investment)

rr_ShareholderFeeOther

none

Operating Expenses Caption [Text]

rr_OperatingExpensesCaption

Annual Operating Expenses

(expenses that you pay each year as a % of the value of your investment)

Portfolio Turnover [Heading]

rr_PortfolioTurnoverHeading

Portfolio Turnover

Portfolio Turnover [Text Block]

rr_PortfolioTurnoverTextBlock

The fund pays transaction costs, such as commissions, when it buys and sells securities (or "turns over" its portfolio). A higher portfolio turnover rate may indicate higher transaction costs and may result in higher taxes when fund shares are held in a taxable account. These costs, which are not reflected in annual operating expenses or in the example, affect the fund's performance. During the most recent fiscal year, the fund's portfolio turnover rate was 49% of the average value of its portfolio.

Portfolio Turnover, Rate

rr_PortfolioTurnoverRate

49.00%

Expense Example Narrative [Text Block]

rr_ExpenseExampleNarrativeTextBlock

This example helps compare the cost of investing in the fund with the cost of investing in other funds.

Let's say, hypothetically, that the annual return for shares of the fund is 5% and that your shareholder fees and the annual operating expenses for shares of the fund are exactly as described in the fee table. This example illustrates the effect of fees and expenses, but is not meant to suggest actual or expected fees and expenses or returns, all of which may vary. For every $10,000 you invested, here's how much you would pay in total expenses if you sell all of your shares at the end of each time period indicated:

Expense Example by, Year, Caption [Text]

rr_ExpenseExampleByYearCaption

Sell All Shares

Strategy [Heading]

rr_StrategyHeading

Principal Investment Strategies

Strategy Narrative [Text Block]

rr_StrategyNarrativeTextBlock

• Normally investing primarily in common stocks.

• Normally investing at least 80% of assets in securities of companies principally engaged in the design, manufacture, or sale of products or services used for or in connection with health care or medicine.

• Investing in domestic and foreign issuers.

• Using fundamental analysis of factors such as each issuer's financial condition and industry position, as well as market and economic conditions, to select investments.

Strategy Portfolio Concentration [Text]

rr_StrategyPortfolioConcentration

Normally investing at least 80% of assets in securities of companies principally engaged in the design, manufacture, or sale of products or services used for or in connection with health care or medicine.

Risk [Heading]

rr_RiskHeading

Principal Investment Risks

Risk Narrative [Text Block]

rr_RiskNarrativeTextBlock

• Stock Market Volatility. Stock markets are volatile and can decline significantly in response to adverse issuer, political, regulatory, market, or economic developments. Different parts of the market, including different market sectors, and different types of securities can react differently to these developments.

• Foreign Exposure. Foreign markets can be more volatile than the U.S. market due to increased risks of adverse issuer, political, regulatory, market, or economic developments and can perform differently from the U.S. market.

• Health Care Industry Concentration. The health care industries are subject to government regulation and reimbursement rates, as well as government approval of products and services, which could have a significant effect on price and availability, and can be significantly affected by rapid obsolescence and patent expirations.

• Issuer-Specific Changes. The value of an individual security or particular type of security can be more volatile than, and can perform differently from, the market as a whole. The value of securities of smaller issuers can be more volatile than that of larger issuers.

In addition, the fund is considered non-diversified and can invest a greater portion of assets in securities of a smaller number of individual issuers than a diversified fund. As a result, changes in the market value of a single investment could cause greater fluctuations in share price than would occur in a more diversified fund.

An investment in the fund is not a deposit of a bank and is not insured or guaranteed by the Federal Deposit Insurance Corporation or any other government agency. You could lose money by investing in the fund.

Risk Lose Money [Text]

rr_RiskLoseMoney

You could lose money by investing in the fund.

Risk Nondiversified Status [Text]

rr_RiskNondiversifiedStatus

In addition, the fund is considered non-diversified and can invest a greater portion of assets in securities of a smaller number of individual issuers than a diversified fund. As a result, changes in the market value of a single investment could cause greater fluctuations in share price than would occur in a more diversified fund.

Risk Not Insured Depository Institution [Text]

rr_RiskNotInsuredDepositoryInstitution

An investment in the fund is not a deposit of a bank and is not insured or guaranteed by the Federal Deposit Insurance Corporation or any other government agency.

Bar Chart and Performance Table [Heading]

rr_BarChartAndPerformanceTableHeading

Performance

Performance Narrative [Text Block]

rr_PerformanceNarrativeTextBlock

The following information is intended to help you understand the risks of investing in the fund. The information illustrates the changes in the performance of the fund's shares from year to year and compares the performance of the fund's shares to the performance of a securities market index and an additional index over various periods of time. The indexes have characteristics relevant to the fund's investment strategies. Index descriptions appear in the Additional Index Information section of the prospectus. Past performance (before and after taxes) is not an indication of future performance.

Visit www.fidelity.com for more recent performance information.

Performance Information Illustrates Variability of Returns [Text]

rr_PerformanceInformationIllustratesVariabilityOfReturns

The information illustrates the changes in the performance of the fund's shares from year to year and compares the performance of the fund's shares to the performance of a securities market index and an additional index over various periods of time.

Performance Availability Website Address [Text]

rr_PerformanceAvailabilityWebSiteAddress

www.fidelity.com

Performance Past Does Not Indicate Future [Text]

rr_PerformancePastDoesNotIndicateFuture

Past performance (before and after taxes) is not an indication of future performance.

Bar Chart [Heading]

rr_BarChartHeading

Year-by-Year Returns

Calendar Years

Bar Chart Closing [Text Block]

rr_BarChartClosingTextBlock

During the periods shown in the chart:	Returns	Quarter ended
Highest Quarter Return	14.58%	March 31, 2013
Lowest Quarter Return	-18.09%	December 31, 2008
Year-to-Date Return	12.35%	March 31, 2017

Performance Table Heading

rr_PerformanceTableHeading

Average Annual Returns

Performance Table Uses Highest Federal Rate

rr_PerformanceTableUsesHighestFederalRate

After-tax returns are calculated using the historical highest individual federal marginal income tax rates, but do not reflect the impact of state or local taxes.

Performance Table Not Relevant to Tax Deferred

rr_PerformanceTableNotRelevantToTaxDeferred

The after-tax returns shown are not relevant if you hold your shares in a retirement account or in another tax-deferred arrangement, such as an employee benefit plan (profit sharing, 401(k), or 403(b) plan).

Performance Table Explanation after Tax Higher

rr_PerformanceTableExplanationAfterTaxHigher

Return After Taxes on Distributions and Sale of Fund Shares may be higher than other returns for the same period due to a tax benefit of realizing a capital loss upon the sale of fund shares.

Performance Table Narrative

rr_PerformanceTableNarrativeTextBlock

After-tax returns are calculated using the historical highest individual federal marginal income tax rates, but do not reflect the impact of state or local taxes. Actual after-tax returns may differ depending on your individual circumstances. The after-tax returns shown are not relevant if you hold your shares in a retirement account or in another tax-deferred arrangement, such as an employee benefit plan (profit sharing, 401(k), or 403(b) plan). Return After Taxes on Distributions and Sale of Fund Shares may be higher than other returns for the same period due to a tax benefit of realizing a capital loss upon the sale of fund shares.

For the periods ended December 31, 2016

02.28 Select Portfolios: Group 5 Health Care Sector Combo PRO-05 | Health Care Portfolio | Health Care Portfolio-Default

Risk/Return:

rr_RiskReturnAbstract

Management fee

rr_ManagementFeesOverAssets

0.55%

Distribution and/or Service (12b-1) fees

rr_DistributionAndService12b1FeesOverAssets

none

Other expenses

rr_OtherExpensesOverAssets

0.19%

Total annual operating expenses

rr_ExpensesOverAssets

0.74%

1 year

rr_ExpenseExampleYear01

$ 76

3 years

rr_ExpenseExampleYear03

237

5 years

rr_ExpenseExampleYear05

411

10 years

rr_ExpenseExampleYear10

$ 918

2007

rr_AnnualReturn2007

12.45%

2008

rr_AnnualReturn2008

(32.44%)

2009

rr_AnnualReturn2009

32.11%

2010

rr_AnnualReturn2010

16.96%

2011

rr_AnnualReturn2011

7.82%

2012

rr_AnnualReturn2012

21.39%

2013

rr_AnnualReturn2013

56.27%

2014

rr_AnnualReturn2014

32.88%

2015

rr_AnnualReturn2015

6.57%

2016

rr_AnnualReturn2016

(10.68%)

Year to Date Return, Label

rr_YearToDateReturnLabel

Year-to-Date Return

Bar Chart, Year to Date Return, Date

rr_BarChartYearToDateReturnDate

Mar. 31, 2017

Bar Chart, Year to Date Return

rr_BarChartYearToDateReturn

12.35%

Highest Quarterly Return, Label

rr_HighestQuarterlyReturnLabel

Highest Quarter Return

Highest Quarterly Return, Date

rr_BarChartHighestQuarterlyReturnDate

Mar. 31, 2013

Highest Quarterly Return

rr_BarChartHighestQuarterlyReturn

14.58%

Lowest Quarterly Return, Label

rr_LowestQuarterlyReturnLabel

Lowest Quarter Return

Lowest Quarterly Return, Date

rr_BarChartLowestQuarterlyReturnDate

Dec. 31, 2008

Lowest Quarterly Return

rr_BarChartLowestQuarterlyReturn

(18.09%)

02.28 Select Portfolios: Group 5 Health Care Sector Combo PRO-05 | Health Care Portfolio | Return Before Taxes | Health Care Portfolio-Default

Risk/Return:

rr_RiskReturnAbstract

Column

rr_AverageAnnualReturnColumnName

Health Care Portfolio

Label

rr_AverageAnnualReturnLabel

Return Before Taxes

Past 1 year

rr_AverageAnnualReturnYear01

(10.68%)

Past 5 years

rr_AverageAnnualReturnYear05

19.13%

Past 10 years

rr_AverageAnnualReturnYear10

11.75%

02.28 Select Portfolios: Group 5 Health Care Sector Combo PRO-05 | Health Care Portfolio | After Taxes on Distributions | Health Care Portfolio-Default

Risk/Return:

rr_RiskReturnAbstract

Column

rr_AverageAnnualReturnColumnName

Health Care Portfolio

Label

rr_AverageAnnualReturnLabel

Return After Taxes on Distributions

Past 1 year

rr_AverageAnnualReturnYear01

(10.80%)

Past 5 years

rr_AverageAnnualReturnYear05

16.41%

Past 10 years

rr_AverageAnnualReturnYear10

10.02%

02.28 Select Portfolios: Group 5 Health Care Sector Combo PRO-05 | Health Care Portfolio | After Taxes on Distributions and Sales | Health Care Portfolio-Default

Risk/Return:

rr_RiskReturnAbstract

Column

rr_AverageAnnualReturnColumnName

Health Care Portfolio

Label

rr_AverageAnnualReturnLabel

Return After Taxes on Distributions and Sale of Fund Shares

Past 1 year

rr_AverageAnnualReturnYear01

(5.93%)

Past 5 years

rr_AverageAnnualReturnYear05

15.08%

Past 10 years

rr_AverageAnnualReturnYear10

9.40%

02.28 Select Portfolios: Group 5 Health Care Sector Combo PRO-05 | Health Care Portfolio | S&P 500® Index(reflects no deduction for fees, expenses, or taxes)

Risk/Return:

rr_RiskReturnAbstract

Past 1 year

rr_AverageAnnualReturnYear01

11.96%

Past 5 years

rr_AverageAnnualReturnYear05

14.66%

Past 10 years

rr_AverageAnnualReturnYear10

6.95%

02.28 Select Portfolios: Group 5 Health Care Sector Combo PRO-05 | Health Care Portfolio | MSCI U.S. IMI Health Care 25-50 Index(reflects no deduction for fees, expenses, or taxes)

Risk/Return:

rr_RiskReturnAbstract

Past 1 year

rr_AverageAnnualReturnYear01

(3.26%)

Past 5 years

rr_AverageAnnualReturnYear05

17.26%

Past 10 years

rr_AverageAnnualReturnYear10

10.16%

XML

02.28 Select Portfolios: Group 5 Health Care Sector Combo PRO-05 | Health Care Services Portfolio

Fund Summary

Fund:
Health Care Services Portfolio

Investment Objective

The fund seeks capital appreciation.

Fee Table

The following table describes the fees and expenses that may be incurred when you buy and hold shares of the fund.

Shareholder fees

(fees paid directly from your investment)

Shareholder Fees {- Health Care Services Portfolio}	02.28 Select Portfolios: Group 5 Health Care Sector Combo PRO-05 Health Care Services Portfolio Health Care Services Portfolio-Default
Redemption fee on shares held less than 30 days (as a % of amount redeemed)	0.75%

Annual Operating Expenses

(expenses that you pay each year as a % of the value of your investment)

Annual Operating Expenses {- Health Care Services Portfolio}	02.28 Select Portfolios: Group 5 Health Care Sector Combo PRO-05 Health Care Services Portfolio Health Care Services Portfolio-Default
Management fee	0.55%
Distribution and/or Service (12b-1) fees	none
Other expenses	0.23%
Total annual operating expenses	0.78%

This example helps compare the cost of investing in the fund with the cost of investing in other funds.

Let's say, hypothetically, that the annual return for shares of the fund is 5% and that your shareholder fees and the annual operating expenses for shares of the fund are exactly as described in the fee table. This example illustrates the effect of fees and expenses, but is not meant to suggest actual or expected fees and expenses or returns, all of which may vary. For every $10,000 you invested, here's how much you would pay in total expenses if you sell all of your shares at the end of each time period indicated:

Sell All Shares

Expense Example {- Health Care Services Portfolio}	02.28 Select Portfolios: Group 5 Health Care Sector Combo PRO-05 Health Care Services Portfolio Health Care Services Portfolio-Default USD ($)
1 year	$ 80
3 years	249
5 years	433
10 years	$ 966

Portfolio Turnover

The fund pays transaction costs, such as commissions, when it buys and sells securities (or "turns over" its portfolio). A higher portfolio turnover rate may indicate higher transaction costs and may result in higher taxes when fund shares are held in a taxable account. These costs, which are not reflected in annual operating expenses or in the example, affect the fund's performance. During the most recent fiscal year, the fund's portfolio turnover rate was 26% of the average value of its portfolio.

Principal Investment Strategies

• Normally investing primarily in common stocks.

• Normally investing at least 80% of assets in securities of companies principally engaged in the ownership or management of hospitals, nursing homes, health maintenance organizations, and other companies specializing in the delivery of health care services.

• Investing in domestic and foreign issuers.

• Using fundamental analysis of factors such as each issuer's financial condition and industry position, as well as market and economic conditions, to select investments.

Principal Investment Risks

• Stock Market Volatility. Stock markets are volatile and can decline significantly in response to adverse issuer, political, regulatory, market, or economic developments. Different parts of the market, including different market sectors, and different types of securities can react differently to these developments.

• Foreign Exposure. Foreign markets can be more volatile than the U.S. market due to increased risks of adverse issuer, political, regulatory, market, or economic developments and can perform differently from the U.S. market.

• Health Care Services Industry Concentration. The health care services industry is subject to extensive government regulation and can be significantly affected by government reimbursement for medical expenses, rising costs of medical products and services, pricing pressure, and an increased emphasis on outpatient services.

• Issuer-Specific Changes. The value of an individual security or particular type of security can be more volatile than, and can perform differently from, the market as a whole. The value of securities of smaller issuers can be more volatile than that of larger issuers.

In addition, the fund is considered non-diversified and can invest a greater portion of assets in securities of a smaller number of individual issuers than a diversified fund. As a result, changes in the market value of a single investment could cause greater fluctuations in share price than would occur in a more diversified fund.

An investment in the fund is not a deposit of a bank and is not insured or guaranteed by the Federal Deposit Insurance Corporation or any other government agency. You could lose money by investing in the fund.

Performance

The following information is intended to help you understand the risks of investing in the fund. The information illustrates the changes in the performance of the fund's shares from year to year and compares the performance of the fund's shares to the performance of a securities market index and an additional index over various periods of time. The indexes have characteristics relevant to the fund's investment strategies. Index descriptions appear in the Additional Index Information section of the prospectus. Past performance (before and after taxes) is not an indication of future performance.

Visit www.fidelity.com for more recent performance information.

Year-by-Year Returns

Calendar Years

During the periods shown in the chart:	Returns	Quarter ended
Highest Quarter Return	26.05%	June 30, 2009
Lowest Quarter Return	-25.94%	March 31, 2008
Year-to-Date Return	7.45%	March 31, 2017

Average Annual Returns

After-tax returns are calculated using the historical highest individual federal marginal income tax rates, but do not reflect the impact of state or local taxes. Actual after-tax returns may differ depending on your individual circumstances. The after-tax returns shown are not relevant if you hold your shares in a retirement account or in another tax-deferred arrangement, such as an employee benefit plan (profit sharing, 401(k), or 403(b) plan). Return After Taxes on Distributions and Sale of Fund Shares may be higher than other returns for the same period due to a tax benefit of realizing a capital loss upon the sale of fund shares.

For the periods ended December 31, 2016

Average Annual Total Returns{- Health Care Services Portfolio} - 02.28 Select Portfolios: Group 5 Health Care Sector Combo PRO-05 - Health Care Services Portfolio	Past 1 year	Past 5 years	Past 10 years
Health Care Services Portfolio-Default | Return Before Taxes	2.25%	15.13%	9.53%
Health Care Services Portfolio-Default | After Taxes on Distributions	1.17%	13.49%	8.60%
Health Care Services Portfolio-Default | After Taxes on Distributions and Sales	2.17%	11.89%	7.67%
S&P 500® Index(reflects no deduction for fees, expenses, or taxes)	11.96%	14.66%	6.95%
MSCI U.S. IMI Health Care Providers & Services 25-50 Index(reflects no deduction for fees, expenses, or taxes)	1.76%	18.55%	9.99%

XML

Label

Element

Value

Risk/Return:

rr_RiskReturnAbstract

Registrant Name

dei_EntityRegistrantName

FIDELITY SELECT PORTFOLIOS

Prospectus Date

rr_ProspectusDate

Apr. 29, 2017

02.28 Select Portfolios: Group 5 Health Care Sector Combo PRO-05 | Health Care Services Portfolio

Risk/Return:

rr_RiskReturnAbstract

Risk/Return [Heading]

rr_RiskReturnHeading

Fund Summary

Fund:
Health Care Services Portfolio

Objective [Heading]

rr_ObjectiveHeading

Investment Objective

Objective, Primary [Text Block]

rr_ObjectivePrimaryTextBlock

The fund seeks capital appreciation.

Expense [Heading]

rr_ExpenseHeading

Fee Table

Expense Narrative [Text Block]

rr_ExpenseNarrativeTextBlock

The following table describes the fees and expenses that may be incurred when you buy and hold shares of the fund.

Shareholder Fees Caption [Text]

rr_ShareholderFeesCaption

Shareholder fees

(fees paid directly from your investment)

Operating Expenses Caption [Text]

rr_OperatingExpensesCaption

Annual Operating Expenses

(expenses that you pay each year as a % of the value of your investment)

Portfolio Turnover [Heading]

rr_PortfolioTurnoverHeading

Portfolio Turnover

Portfolio Turnover [Text Block]

rr_PortfolioTurnoverTextBlock

The fund pays transaction costs, such as commissions, when it buys and sells securities (or "turns over" its portfolio). A higher portfolio turnover rate may indicate higher transaction costs and may result in higher taxes when fund shares are held in a taxable account. These costs, which are not reflected in annual operating expenses or in the example, affect the fund's performance. During the most recent fiscal year, the fund's portfolio turnover rate was 26% of the average value of its portfolio.

Portfolio Turnover, Rate

rr_PortfolioTurnoverRate

26.00%

Expense Example Narrative [Text Block]

rr_ExpenseExampleNarrativeTextBlock

This example helps compare the cost of investing in the fund with the cost of investing in other funds.

Let's say, hypothetically, that the annual return for shares of the fund is 5% and that your shareholder fees and the annual operating expenses for shares of the fund are exactly as described in the fee table. This example illustrates the effect of fees and expenses, but is not meant to suggest actual or expected fees and expenses or returns, all of which may vary. For every $10,000 you invested, here's how much you would pay in total expenses if you sell all of your shares at the end of each time period indicated:

Expense Example by, Year, Caption [Text]

rr_ExpenseExampleByYearCaption

Sell All Shares

Strategy [Heading]

rr_StrategyHeading

Principal Investment Strategies

Strategy Narrative [Text Block]

rr_StrategyNarrativeTextBlock

• Normally investing primarily in common stocks.

• Normally investing at least 80% of assets in securities of companies principally engaged in the ownership or management of hospitals, nursing homes, health maintenance organizations, and other companies specializing in the delivery of health care services.

• Investing in domestic and foreign issuers.

• Using fundamental analysis of factors such as each issuer's financial condition and industry position, as well as market and economic conditions, to select investments.

Strategy Portfolio Concentration [Text]

rr_StrategyPortfolioConcentration

Normally investing at least 80% of assets in securities of companies principally engaged in the ownership or management of hospitals, nursing homes, health maintenance organizations, and other companies specializing in the delivery of health care services.

Risk [Heading]

rr_RiskHeading

Principal Investment Risks

Risk Narrative [Text Block]

rr_RiskNarrativeTextBlock

• Stock Market Volatility. Stock markets are volatile and can decline significantly in response to adverse issuer, political, regulatory, market, or economic developments. Different parts of the market, including different market sectors, and different types of securities can react differently to these developments.

• Foreign Exposure. Foreign markets can be more volatile than the U.S. market due to increased risks of adverse issuer, political, regulatory, market, or economic developments and can perform differently from the U.S. market.

• Health Care Services Industry Concentration. The health care services industry is subject to extensive government regulation and can be significantly affected by government reimbursement for medical expenses, rising costs of medical products and services, pricing pressure, and an increased emphasis on outpatient services.

• Issuer-Specific Changes. The value of an individual security or particular type of security can be more volatile than, and can perform differently from, the market as a whole. The value of securities of smaller issuers can be more volatile than that of larger issuers.

In addition, the fund is considered non-diversified and can invest a greater portion of assets in securities of a smaller number of individual issuers than a diversified fund. As a result, changes in the market value of a single investment could cause greater fluctuations in share price than would occur in a more diversified fund.

An investment in the fund is not a deposit of a bank and is not insured or guaranteed by the Federal Deposit Insurance Corporation or any other government agency. You could lose money by investing in the fund.

Risk Lose Money [Text]

rr_RiskLoseMoney

You could lose money by investing in the fund.

Risk Nondiversified Status [Text]

rr_RiskNondiversifiedStatus

In addition, the fund is considered non-diversified and can invest a greater portion of assets in securities of a smaller number of individual issuers than a diversified fund. As a result, changes in the market value of a single investment could cause greater fluctuations in share price than would occur in a more diversified fund.

Risk Not Insured Depository Institution [Text]

rr_RiskNotInsuredDepositoryInstitution

An investment in the fund is not a deposit of a bank and is not insured or guaranteed by the Federal Deposit Insurance Corporation or any other government agency.

Bar Chart and Performance Table [Heading]

rr_BarChartAndPerformanceTableHeading

Performance

Performance Narrative [Text Block]

rr_PerformanceNarrativeTextBlock

The following information is intended to help you understand the risks of investing in the fund. The information illustrates the changes in the performance of the fund's shares from year to year and compares the performance of the fund's shares to the performance of a securities market index and an additional index over various periods of time. The indexes have characteristics relevant to the fund's investment strategies. Index descriptions appear in the Additional Index Information section of the prospectus. Past performance (before and after taxes) is not an indication of future performance.

Visit www.fidelity.com for more recent performance information.

Performance Information Illustrates Variability of Returns [Text]

rr_PerformanceInformationIllustratesVariabilityOfReturns

The information illustrates the changes in the performance of the fund's shares from year to year and compares the performance of the fund's shares to the performance of a securities market index and an additional index over various periods of time.

Performance Availability Website Address [Text]

rr_PerformanceAvailabilityWebSiteAddress

www.fidelity.com

Performance Past Does Not Indicate Future [Text]

rr_PerformancePastDoesNotIndicateFuture

Past performance (before and after taxes) is not an indication of future performance.

Bar Chart [Heading]

rr_BarChartHeading

Year-by-Year Returns

Calendar Years

Bar Chart Closing [Text Block]

rr_BarChartClosingTextBlock

During the periods shown in the chart:	Returns	Quarter ended
Highest Quarter Return	26.05%	June 30, 2009
Lowest Quarter Return	-25.94%	March 31, 2008
Year-to-Date Return	7.45%	March 31, 2017

Performance Table Heading

rr_PerformanceTableHeading

Average Annual Returns

Performance Table Uses Highest Federal Rate

rr_PerformanceTableUsesHighestFederalRate

After-tax returns are calculated using the historical highest individual federal marginal income tax rates, but do not reflect the impact of state or local taxes.

Performance Table Not Relevant to Tax Deferred

rr_PerformanceTableNotRelevantToTaxDeferred

The after-tax returns shown are not relevant if you hold your shares in a retirement account or in another tax-deferred arrangement, such as an employee benefit plan (profit sharing, 401(k), or 403(b) plan).

Performance Table Explanation after Tax Higher

rr_PerformanceTableExplanationAfterTaxHigher

Return After Taxes on Distributions and Sale of Fund Shares may be higher than other returns for the same period due to a tax benefit of realizing a capital loss upon the sale of fund shares.

Performance Table Narrative

rr_PerformanceTableNarrativeTextBlock

After-tax returns are calculated using the historical highest individual federal marginal income tax rates, but do not reflect the impact of state or local taxes. Actual after-tax returns may differ depending on your individual circumstances. The after-tax returns shown are not relevant if you hold your shares in a retirement account or in another tax-deferred arrangement, such as an employee benefit plan (profit sharing, 401(k), or 403(b) plan). Return After Taxes on Distributions and Sale of Fund Shares may be higher than other returns for the same period due to a tax benefit of realizing a capital loss upon the sale of fund shares.

For the periods ended December 31, 2016

02.28 Select Portfolios: Group 5 Health Care Sector Combo PRO-05 | Health Care Services Portfolio | Health Care Services Portfolio-Default

Risk/Return:

rr_RiskReturnAbstract

Redemption fee on shares held less than 30 days (as a % of amount redeemed)

rr_RedemptionFeeOverRedemption

0.75%

Management fee

rr_ManagementFeesOverAssets

0.55%

Distribution and/or Service (12b-1) fees

rr_DistributionAndService12b1FeesOverAssets

none

Other expenses

rr_OtherExpensesOverAssets

0.23%

Total annual operating expenses

rr_ExpensesOverAssets

0.78%

1 year

rr_ExpenseExampleYear01

$ 80

3 years

rr_ExpenseExampleYear03

249

5 years

rr_ExpenseExampleYear05

433

10 years

rr_ExpenseExampleYear10

$ 966

2007

rr_AnnualReturn2007

16.86%

2008

rr_AnnualReturn2008

(44.56%)

2009

rr_AnnualReturn2009

48.98%

2010

rr_AnnualReturn2010

15.43%

2011

rr_AnnualReturn2011

10.23%

2012

rr_AnnualReturn2012

10.55%

2013

rr_AnnualReturn2013

35.31%

2014

rr_AnnualReturn2014

23.66%

2015

rr_AnnualReturn2015

6.95%

2016

rr_AnnualReturn2016

2.25%

Year to Date Return, Label

rr_YearToDateReturnLabel

Year-to-Date Return

Bar Chart, Year to Date Return, Date

rr_BarChartYearToDateReturnDate

Mar. 31, 2017

Bar Chart, Year to Date Return

rr_BarChartYearToDateReturn

7.45%

Highest Quarterly Return, Label

rr_HighestQuarterlyReturnLabel

Highest Quarter Return

Highest Quarterly Return, Date

rr_BarChartHighestQuarterlyReturnDate

Jun. 30, 2009

Highest Quarterly Return

rr_BarChartHighestQuarterlyReturn

26.05%

Lowest Quarterly Return, Label

rr_LowestQuarterlyReturnLabel

Lowest Quarter Return

Lowest Quarterly Return, Date

rr_BarChartLowestQuarterlyReturnDate

Mar. 31, 2008

Lowest Quarterly Return

rr_BarChartLowestQuarterlyReturn

(25.94%)

02.28 Select Portfolios: Group 5 Health Care Sector Combo PRO-05 | Health Care Services Portfolio | Return Before Taxes | Health Care Services Portfolio-Default

Risk/Return:

rr_RiskReturnAbstract

Column

rr_AverageAnnualReturnColumnName

Health Care Services Portfolio

Label

rr_AverageAnnualReturnLabel

Return Before Taxes

Past 1 year

rr_AverageAnnualReturnYear01

2.25%

Past 5 years

rr_AverageAnnualReturnYear05

15.13%

Past 10 years

rr_AverageAnnualReturnYear10

9.53%

02.28 Select Portfolios: Group 5 Health Care Sector Combo PRO-05 | Health Care Services Portfolio | After Taxes on Distributions | Health Care Services Portfolio-Default

Risk/Return:

rr_RiskReturnAbstract

Column

rr_AverageAnnualReturnColumnName

Health Care Services Portfolio

Label

rr_AverageAnnualReturnLabel

Return After Taxes on Distributions

Past 1 year

rr_AverageAnnualReturnYear01

1.17%

Past 5 years

rr_AverageAnnualReturnYear05

13.49%

Past 10 years

rr_AverageAnnualReturnYear10

8.60%

02.28 Select Portfolios: Group 5 Health Care Sector Combo PRO-05 | Health Care Services Portfolio | After Taxes on Distributions and Sales | Health Care Services Portfolio-Default

Risk/Return:

rr_RiskReturnAbstract

Column

rr_AverageAnnualReturnColumnName

Health Care Services Portfolio

Label

rr_AverageAnnualReturnLabel

Return After Taxes on Distributions and Sale of Fund Shares

Past 1 year

rr_AverageAnnualReturnYear01

2.17%

Past 5 years

rr_AverageAnnualReturnYear05

11.89%

Past 10 years

rr_AverageAnnualReturnYear10

7.67%

02.28 Select Portfolios: Group 5 Health Care Sector Combo PRO-05 | Health Care Services Portfolio | S&P 500® Index(reflects no deduction for fees, expenses, or taxes)

Risk/Return:

rr_RiskReturnAbstract

Past 1 year

rr_AverageAnnualReturnYear01

11.96%

Past 5 years

rr_AverageAnnualReturnYear05

14.66%

Past 10 years

rr_AverageAnnualReturnYear10

6.95%

02.28 Select Portfolios: Group 5 Health Care Sector Combo PRO-05 | Health Care Services Portfolio | MSCI U.S. IMI Health Care Providers & Services 25-50 Index(reflects no deduction for fees, expenses, or taxes)

Risk/Return:

rr_RiskReturnAbstract

Past 1 year

rr_AverageAnnualReturnYear01

1.76%

Past 5 years

rr_AverageAnnualReturnYear05

18.55%

Past 10 years

rr_AverageAnnualReturnYear10

9.99%

XML

02.28 Select Portfolios: Group 5 Health Care Sector Combo PRO-05 | Medical Equipment and Systems Portfolio

Fund Summary

Fund:
Medical Equipment and Systems Portfolio

Investment Objective

The fund seeks capital appreciation.

Fee Table

The following table describes the fees and expenses that may be incurred when you buy and hold shares of the fund.

Shareholder fees

Shareholder Fees {- Medical Equipment and Systems Portfolio}	02.28 Select Portfolios: Group 5 Health Care Sector Combo PRO-05 Medical Equipment and Systems Portfolio USD ($)
(fees paid directly from your investment)	none

Annual Operating Expenses

(expenses that you pay each year as a % of the value of your investment)

Annual Operating Expenses {- Medical Equipment and Systems Portfolio}	02.28 Select Portfolios: Group 5 Health Care Sector Combo PRO-05 Medical Equipment and Systems Portfolio Medical Equipment and Systems Portfolio-Default
Management fee	0.55%
Distribution and/or Service (12b-1) fees	none
Other expenses	0.21%
Total annual operating expenses	0.76%

This example helps compare the cost of investing in the fund with the cost of investing in other funds.

Let's say, hypothetically, that the annual return for shares of the fund is 5% and that your shareholder fees and the annual operating expenses for shares of the fund are exactly as described in the fee table. This example illustrates the effect of fees and expenses, but is not meant to suggest actual or expected fees and expenses or returns, all of which may vary. For every $10,000 you invested, here's how much you would pay in total expenses if you sell all of your shares at the end of each time period indicated:

Sell All Shares

Expense Example {- Medical Equipment and Systems Portfolio}	02.28 Select Portfolios: Group 5 Health Care Sector Combo PRO-05 Medical Equipment and Systems Portfolio Medical Equipment and Systems Portfolio-Default USD ($)
1 year	$ 78
3 years	243
5 years	422
10 years	$ 942

Portfolio Turnover

The fund pays transaction costs, such as commissions, when it buys and sells securities (or "turns over" its portfolio). A higher portfolio turnover rate may indicate higher transaction costs and may result in higher taxes when fund shares are held in a taxable account. These costs, which are not reflected in annual operating expenses or in the example, affect the fund's performance. During the most recent fiscal year, the fund's portfolio turnover rate was 55% of the average value of its portfolio.

Principal Investment Strategies

• Normally investing primarily in common stocks.

• Normally investing at least 80% of assets in securities of companies principally engaged in research, development, manufacture, distribution, supply, or sale of medical equipment and devices and related technologies.

• Investing in domestic and foreign issuers.

• Using fundamental analysis of factors such as each issuer's financial condition and industry position, as well as market and economic conditions, to select investments.

Principal Investment Risks

• Stock Market Volatility. Stock markets are volatile and can decline significantly in response to adverse issuer, political, regulatory, market, or economic developments. Different parts of the market, including different market sectors, and different types of securities can react differently to these developments.

• Foreign Exposure. Foreign markets can be more volatile than the U.S. market due to increased risks of adverse issuer, political, regulatory, market, or economic developments and can perform differently from the U.S. market.

• Medical Equipment and Systems Industry Concentration. The medical equipment and systems industry can be significantly affected by patent considerations, competition, technology, government regulation, and government reimbursement for medical expenses.

• Issuer-Specific Changes. The value of an individual security or particular type of security can be more volatile than, and can perform differently from, the market as a whole. The value of securities of smaller issuers can be more volatile than that of larger issuers.

In addition, the fund is considered non-diversified and can invest a greater portion of assets in securities of a smaller number of individual issuers than a diversified fund. As a result, changes in the market value of a single investment could cause greater fluctuations in share price than would occur in a more diversified fund.

An investment in the fund is not a deposit of a bank and is not insured or guaranteed by the Federal Deposit Insurance Corporation or any other government agency. You could lose money by investing in the fund.

Performance

The following information is intended to help you understand the risks of investing in the fund. The information illustrates the changes in the performance of the fund's shares from year to year and compares the performance of the fund's shares to the performance of a securities market index and an additional index over various periods of time. The indexes have characteristics relevant to the fund's investment strategies. Index descriptions appear in the Additional Index Information section of the prospectus. Past performance (before and after taxes) is not an indication of future performance.

Visit www.fidelity.com for more recent performance information.

Year-by-Year Returns

Calendar Years

During the periods shown in the chart:	Returns	Quarter ended
Highest Quarter Return	14.80%	June 30, 2016
Lowest Quarter Return	-25.55%	December 31, 2008
Year-to-Date Return	14.69%	March 31, 2017

Average Annual Returns

After-tax returns are calculated using the historical highest individual federal marginal income tax rates, but do not reflect the impact of state or local taxes. Actual after-tax returns may differ depending on your individual circumstances. The after-tax returns shown are not relevant if you hold your shares in a retirement account or in another tax-deferred arrangement, such as an employee benefit plan (profit sharing, 401(k), or 403(b) plan).

For the periods ended December 31, 2016

Average Annual Total Returns{- Medical Equipment and Systems Portfolio} - 02.28 Select Portfolios: Group 5 Health Care Sector Combo PRO-05 - Medical Equipment and Systems Portfolio	Past 1 year	Past 5 years	Past 10 years
Medical Equipment and Systems Portfolio-Default | Return Before Taxes	8.68%	19.23%	12.13%
Medical Equipment and Systems Portfolio-Default | After Taxes on Distributions	7.16%	16.26%	10.37%
Medical Equipment and Systems Portfolio-Default | After Taxes on Distributions and Sales	6.01%	15.01%	9.67%
S&P 500® Index(reflects no deduction for fees, expenses, or taxes)	11.96%	14.66%	6.95%
MSCI U.S. IMI Health Care Equipment & Supplies 25-50 Index(reflects no deduction for fees, expenses, or taxes)	7.87%	16.91%	8.85%

XML

Label

Element

Value

Risk/Return:

rr_RiskReturnAbstract

Registrant Name

dei_EntityRegistrantName

FIDELITY SELECT PORTFOLIOS

Prospectus Date

rr_ProspectusDate

Apr. 29, 2017

02.28 Select Portfolios: Group 5 Health Care Sector Combo PRO-05 | Medical Equipment and Systems Portfolio

Risk/Return:

rr_RiskReturnAbstract

Risk/Return [Heading]

rr_RiskReturnHeading

Fund Summary

Fund:
Medical Equipment and Systems Portfolio

Objective [Heading]

rr_ObjectiveHeading

Investment Objective

Objective, Primary [Text Block]

rr_ObjectivePrimaryTextBlock

The fund seeks capital appreciation.

Expense [Heading]

rr_ExpenseHeading

Fee Table

Expense Narrative [Text Block]

rr_ExpenseNarrativeTextBlock

The following table describes the fees and expenses that may be incurred when you buy and hold shares of the fund.

Shareholder Fees Caption [Text]

rr_ShareholderFeesCaption

Shareholder fees

(fees paid directly from your investment)

rr_ShareholderFeeOther

none

Operating Expenses Caption [Text]

rr_OperatingExpensesCaption

Annual Operating Expenses

(expenses that you pay each year as a % of the value of your investment)

Portfolio Turnover [Heading]

rr_PortfolioTurnoverHeading

Portfolio Turnover

Portfolio Turnover [Text Block]

rr_PortfolioTurnoverTextBlock

The fund pays transaction costs, such as commissions, when it buys and sells securities (or "turns over" its portfolio). A higher portfolio turnover rate may indicate higher transaction costs and may result in higher taxes when fund shares are held in a taxable account. These costs, which are not reflected in annual operating expenses or in the example, affect the fund's performance. During the most recent fiscal year, the fund's portfolio turnover rate was 55% of the average value of its portfolio.

Portfolio Turnover, Rate

rr_PortfolioTurnoverRate

55.00%

Expense Example Narrative [Text Block]

rr_ExpenseExampleNarrativeTextBlock

This example helps compare the cost of investing in the fund with the cost of investing in other funds.

Let's say, hypothetically, that the annual return for shares of the fund is 5% and that your shareholder fees and the annual operating expenses for shares of the fund are exactly as described in the fee table. This example illustrates the effect of fees and expenses, but is not meant to suggest actual or expected fees and expenses or returns, all of which may vary. For every $10,000 you invested, here's how much you would pay in total expenses if you sell all of your shares at the end of each time period indicated:

Expense Example by, Year, Caption [Text]

rr_ExpenseExampleByYearCaption

Sell All Shares

Strategy [Heading]

rr_StrategyHeading

Principal Investment Strategies

Strategy Narrative [Text Block]

rr_StrategyNarrativeTextBlock

• Normally investing primarily in common stocks.

• Normally investing at least 80% of assets in securities of companies principally engaged in research, development, manufacture, distribution, supply, or sale of medical equipment and devices and related technologies.

• Investing in domestic and foreign issuers.

• Using fundamental analysis of factors such as each issuer's financial condition and industry position, as well as market and economic conditions, to select investments.

Strategy Portfolio Concentration [Text]

rr_StrategyPortfolioConcentration

Normally investing at least 80% of assets in securities of companies principally engaged in research, development, manufacture, distribution, supply, or sale of medical equipment and devices and related technologies.

Risk [Heading]

rr_RiskHeading

Principal Investment Risks

Risk Narrative [Text Block]

rr_RiskNarrativeTextBlock

• Stock Market Volatility. Stock markets are volatile and can decline significantly in response to adverse issuer, political, regulatory, market, or economic developments. Different parts of the market, including different market sectors, and different types of securities can react differently to these developments.

• Foreign Exposure. Foreign markets can be more volatile than the U.S. market due to increased risks of adverse issuer, political, regulatory, market, or economic developments and can perform differently from the U.S. market.

• Medical Equipment and Systems Industry Concentration. The medical equipment and systems industry can be significantly affected by patent considerations, competition, technology, government regulation, and government reimbursement for medical expenses.

• Issuer-Specific Changes. The value of an individual security or particular type of security can be more volatile than, and can perform differently from, the market as a whole. The value of securities of smaller issuers can be more volatile than that of larger issuers.

In addition, the fund is considered non-diversified and can invest a greater portion of assets in securities of a smaller number of individual issuers than a diversified fund. As a result, changes in the market value of a single investment could cause greater fluctuations in share price than would occur in a more diversified fund.

An investment in the fund is not a deposit of a bank and is not insured or guaranteed by the Federal Deposit Insurance Corporation or any other government agency. You could lose money by investing in the fund.

Risk Lose Money [Text]

rr_RiskLoseMoney

You could lose money by investing in the fund.

Risk Nondiversified Status [Text]

rr_RiskNondiversifiedStatus

In addition, the fund is considered non-diversified and can invest a greater portion of assets in securities of a smaller number of individual issuers than a diversified fund. As a result, changes in the market value of a single investment could cause greater fluctuations in share price than would occur in a more diversified fund.

Risk Not Insured Depository Institution [Text]

rr_RiskNotInsuredDepositoryInstitution

An investment in the fund is not a deposit of a bank and is not insured or guaranteed by the Federal Deposit Insurance Corporation or any other government agency.

Bar Chart and Performance Table [Heading]

rr_BarChartAndPerformanceTableHeading

Performance

Performance Narrative [Text Block]

rr_PerformanceNarrativeTextBlock

The following information is intended to help you understand the risks of investing in the fund. The information illustrates the changes in the performance of the fund's shares from year to year and compares the performance of the fund's shares to the performance of a securities market index and an additional index over various periods of time. The indexes have characteristics relevant to the fund's investment strategies. Index descriptions appear in the Additional Index Information section of the prospectus. Past performance (before and after taxes) is not an indication of future performance.

Visit www.fidelity.com for more recent performance information.

Performance Information Illustrates Variability of Returns [Text]

rr_PerformanceInformationIllustratesVariabilityOfReturns

The information illustrates the changes in the performance of the fund's shares from year to year and compares the performance of the fund's shares to the performance of a securities market index and an additional index over various periods of time.

Performance Availability Website Address [Text]

rr_PerformanceAvailabilityWebSiteAddress

www.fidelity.com

Performance Past Does Not Indicate Future [Text]

rr_PerformancePastDoesNotIndicateFuture

Past performance (before and after taxes) is not an indication of future performance.

Bar Chart [Heading]

rr_BarChartHeading

Year-by-Year Returns

Calendar Years

Bar Chart Closing [Text Block]

rr_BarChartClosingTextBlock

During the periods shown in the chart:	Returns	Quarter ended
Highest Quarter Return	14.80%	June 30, 2016
Lowest Quarter Return	-25.55%	December 31, 2008
Year-to-Date Return	14.69%	March 31, 2017

Performance Table Heading

rr_PerformanceTableHeading

Average Annual Returns

Performance Table Uses Highest Federal Rate

rr_PerformanceTableUsesHighestFederalRate

After-tax returns are calculated using the historical highest individual federal marginal income tax rates, but do not reflect the impact of state or local taxes.

Performance Table Not Relevant to Tax Deferred

rr_PerformanceTableNotRelevantToTaxDeferred

The after-tax returns shown are not relevant if you hold your shares in a retirement account or in another tax-deferred arrangement, such as an employee benefit plan (profit sharing, 401(k), or 403(b) plan).

Performance Table Narrative

rr_PerformanceTableNarrativeTextBlock

After-tax returns are calculated using the historical highest individual federal marginal income tax rates, but do not reflect the impact of state or local taxes. Actual after-tax returns may differ depending on your individual circumstances. The after-tax returns shown are not relevant if you hold your shares in a retirement account or in another tax-deferred arrangement, such as an employee benefit plan (profit sharing, 401(k), or 403(b) plan).

For the periods ended December 31, 2016

02.28 Select Portfolios: Group 5 Health Care Sector Combo PRO-05 | Medical Equipment and Systems Portfolio | Medical Equipment and Systems Portfolio-Default

Risk/Return:

rr_RiskReturnAbstract

Management fee

rr_ManagementFeesOverAssets

0.55%

Distribution and/or Service (12b-1) fees

rr_DistributionAndService12b1FeesOverAssets

none

Other expenses

rr_OtherExpensesOverAssets

0.21%

Total annual operating expenses

rr_ExpensesOverAssets

0.76%

1 year

rr_ExpenseExampleYear01

$ 78

3 years

rr_ExpenseExampleYear03

243

5 years

rr_ExpenseExampleYear05

422

10 years

rr_ExpenseExampleYear10

$ 942

2007

rr_AnnualReturn2007

17.87%

2008

rr_AnnualReturn2008

(23.38%)

2009

rr_AnnualReturn2009

32.63%

2010

rr_AnnualReturn2010

12.71%

2011

rr_AnnualReturn2011

(3.42%)

2012

rr_AnnualReturn2012

15.62%

2013

rr_AnnualReturn2013

41.30%

2014

rr_AnnualReturn2014

26.70%

2015

rr_AnnualReturn2015

7.11%

2016

rr_AnnualReturn2016

8.68%

Year to Date Return, Label

rr_YearToDateReturnLabel

Year-to-Date Return

Bar Chart, Year to Date Return, Date

rr_BarChartYearToDateReturnDate

Mar. 31, 2017

Bar Chart, Year to Date Return

rr_BarChartYearToDateReturn

14.69%

Highest Quarterly Return, Label

rr_HighestQuarterlyReturnLabel

Highest Quarter Return

Highest Quarterly Return, Date

rr_BarChartHighestQuarterlyReturnDate

Jun. 30, 2016

Highest Quarterly Return

rr_BarChartHighestQuarterlyReturn

14.80%

Lowest Quarterly Return, Label

rr_LowestQuarterlyReturnLabel

Lowest Quarter Return

Lowest Quarterly Return, Date

rr_BarChartLowestQuarterlyReturnDate

Dec. 31, 2008

Lowest Quarterly Return

rr_BarChartLowestQuarterlyReturn

(25.55%)

02.28 Select Portfolios: Group 5 Health Care Sector Combo PRO-05 | Medical Equipment and Systems Portfolio | Return Before Taxes | Medical Equipment and Systems Portfolio-Default

Risk/Return:

rr_RiskReturnAbstract

Column

rr_AverageAnnualReturnColumnName

Medical Equipment and Systems Portfolio

Label

rr_AverageAnnualReturnLabel

Return Before Taxes

Past 1 year

rr_AverageAnnualReturnYear01

8.68%

Past 5 years

rr_AverageAnnualReturnYear05

19.23%

Past 10 years

rr_AverageAnnualReturnYear10

12.13%

02.28 Select Portfolios: Group 5 Health Care Sector Combo PRO-05 | Medical Equipment and Systems Portfolio | After Taxes on Distributions | Medical Equipment and Systems Portfolio-Default

Risk/Return:

rr_RiskReturnAbstract

Column

rr_AverageAnnualReturnColumnName

Medical Equipment and Systems Portfolio

Label

rr_AverageAnnualReturnLabel

Return After Taxes on Distributions

Past 1 year

rr_AverageAnnualReturnYear01

7.16%

Past 5 years

rr_AverageAnnualReturnYear05

16.26%

Past 10 years

rr_AverageAnnualReturnYear10

10.37%

02.28 Select Portfolios: Group 5 Health Care Sector Combo PRO-05 | Medical Equipment and Systems Portfolio | After Taxes on Distributions and Sales | Medical Equipment and Systems Portfolio-Default

Risk/Return:

rr_RiskReturnAbstract

Column

rr_AverageAnnualReturnColumnName

Medical Equipment and Systems Portfolio

Label

rr_AverageAnnualReturnLabel

Return After Taxes on Distributions and Sale of Fund Shares

Past 1 year

rr_AverageAnnualReturnYear01

6.01%

Past 5 years

rr_AverageAnnualReturnYear05

15.01%

Past 10 years

rr_AverageAnnualReturnYear10

9.67%

02.28 Select Portfolios: Group 5 Health Care Sector Combo PRO-05 | Medical Equipment and Systems Portfolio | S&P 500® Index(reflects no deduction for fees, expenses, or taxes)

Risk/Return:

rr_RiskReturnAbstract

Past 1 year

rr_AverageAnnualReturnYear01

11.96%

Past 5 years

rr_AverageAnnualReturnYear05

14.66%

Past 10 years

rr_AverageAnnualReturnYear10

6.95%

02.28 Select Portfolios: Group 5 Health Care Sector Combo PRO-05 | Medical Equipment and Systems Portfolio | MSCI U.S. IMI Health Care Equipment & Supplies 25-50 Index(reflects no deduction for fees, expenses, or taxes)

Risk/Return:

rr_RiskReturnAbstract

Past 1 year

rr_AverageAnnualReturnYear01

7.87%

Past 5 years

rr_AverageAnnualReturnYear05

16.91%

Past 10 years

rr_AverageAnnualReturnYear10

8.85%

XML

02.28 Select Portfolios: Group 5 Health Care Sector Combo PRO-05 | Pharmaceuticals Portfolio

Fund Summary

Fund:
Pharmaceuticals Portfolio

Investment Objective

The fund seeks capital appreciation.

Fee Table

The following table describes the fees and expenses that may be incurred when you buy and hold shares of the fund.

Shareholder fees

Shareholder Fees {- Pharmaceuticals Portfolio}	02.28 Select Portfolios: Group 5 Health Care Sector Combo PRO-05 Pharmaceuticals Portfolio USD ($)
(fees paid directly from your investment)	none

Annual Operating Expenses

(expenses that you pay each year as a % of the value of your investment)

Annual Operating Expenses {- Pharmaceuticals Portfolio}	02.28 Select Portfolios: Group 5 Health Care Sector Combo PRO-05 Pharmaceuticals Portfolio Pharmaceuticals Portfolio-Default
Management fee	0.55%
Distribution and/or Service (12b-1) fees	none
Other expenses	0.25%
Total annual operating expenses	0.80%

This example helps compare the cost of investing in the fund with the cost of investing in other funds.

Let's say, hypothetically, that the annual return for shares of the fund is 5% and that your shareholder fees and the annual operating expenses for shares of the fund are exactly as described in the fee table. This example illustrates the effect of fees and expenses, but is not meant to suggest actual or expected fees and expenses or returns, all of which may vary. For every $10,000 you invested, here's how much you would pay in total expenses if you sell all of your shares at the end of each time period indicated:

Sell All Shares

Expense Example {- Pharmaceuticals Portfolio}	02.28 Select Portfolios: Group 5 Health Care Sector Combo PRO-05 Pharmaceuticals Portfolio Pharmaceuticals Portfolio-Default USD ($)
1 year	$ 82
3 years	255
5 years	444
10 years	$ 990

Portfolio Turnover

The fund pays transaction costs, such as commissions, when it buys and sells securities (or "turns over" its portfolio). A higher portfolio turnover rate may indicate higher transaction costs and may result in higher taxes when fund shares are held in a taxable account. These costs, which are not reflected in annual operating expenses or in the example, affect the fund's performance. During the most recent fiscal year, the fund's portfolio turnover rate was 77% of the average value of its portfolio.

Principal Investment Strategies

• Normally investing primarily in common stocks.

• Normally investing at least 80% of assets in companies engaged in the research, development, manufacture, sale, or distribution of pharmaceuticals and drugs of all types.

• Investing in domestic and foreign issuers.

• Using fundamental analysis of factors such as each issuer's financial condition and industry position, as well as market and economic conditions, to select investments.

Principal Investment Risks

• Stock Market Volatility. Stock markets are volatile and can decline significantly in response to adverse issuer, political, regulatory, market, or economic developments. Different parts of the market, including different market sectors, and different types of securities can react differently to these developments.

• Foreign Exposure. Foreign markets can be more volatile than the U.S. market due to increased risks of adverse issuer, political, regulatory, market, or economic developments and can perform differently from the U.S. market.

• Pharmaceuticals Industry Concentration. The pharmaceuticals industry can be significantly affected by government approval of products and services, government regulation and reimbursement rates, patent expirations, and intense competition.

• Issuer-Specific Changes. The value of an individual security or particular type of security can be more volatile than, and can perform differently from, the market as a whole. The value of securities of smaller issuers can be more volatile than that of larger issuers.

In addition, the fund is considered non-diversified and can invest a greater portion of assets in securities of a smaller number of individual issuers than a diversified fund. As a result, changes in the market value of a single investment could cause greater fluctuations in share price than would occur in a more diversified fund.

An investment in the fund is not a deposit of a bank and is not insured or guaranteed by the Federal Deposit Insurance Corporation or any other government agency. You could lose money by investing in the fund.

Performance

The following information is intended to help you understand the risks of investing in the fund. The information illustrates the changes in the performance of the fund's shares from year to year and compares the performance of the fund's shares to the performance of a securities market index and an additional index over various periods of time. The indexes have characteristics relevant to the fund's investment strategies. Index descriptions appear in the Additional Index Information section of the prospectus. Past performance (before and after taxes) is not an indication of future performance.

Visit www.fidelity.com for more recent performance information.

Year-by-Year Returns

Calendar Years

During the periods shown in the chart:	Returns	Quarter ended
Highest Quarter Return	12.70%	March 31, 2013
Lowest Quarter Return	-14.69%	March 31, 2008
Year-to-Date Return	6.81%	March 31, 2017

Average Annual Returns

After-tax returns are calculated using the historical highest individual federal marginal income tax rates, but do not reflect the impact of state or local taxes. Actual after-tax returns may differ depending on your individual circumstances. The after-tax returns shown are not relevant if you hold your shares in a retirement account or in another tax-deferred arrangement, such as an employee benefit plan (profit sharing, 401(k), or 403(b) plan). Return After Taxes on Distributions and Sale of Fund Shares may be higher than other returns for the same period due to a tax benefit of realizing a capital loss upon the sale of fund shares.

For the periods ended December 31, 2016

Average Annual Total Returns{- Pharmaceuticals Portfolio} - 02.28 Select Portfolios: Group 5 Health Care Sector Combo PRO-05 - Pharmaceuticals Portfolio	Past 1 year	Past 5 years	Past 10 years
Pharmaceuticals Portfolio-Default | Return Before Taxes	(16.27%)	12.62%	10.17%
Pharmaceuticals Portfolio-Default | After Taxes on Distributions	(16.48%)	10.65%	8.95%
Pharmaceuticals Portfolio-Default | After Taxes on Distributions and Sales	(9.04%)	10.03%	8.32%
S&P 500® Index(reflects no deduction for fees, expenses, or taxes)	11.96%	14.66%	6.95%
S&P® Custom Pharmaceuticals Index(reflects no deduction for fees, expenses, or taxes)	(13.77%)	11.72%	8.66%

XML

Label

Element

Value

Risk/Return:

rr_RiskReturnAbstract

Registrant Name

dei_EntityRegistrantName

FIDELITY SELECT PORTFOLIOS

Prospectus Date

rr_ProspectusDate

Apr. 29, 2017

02.28 Select Portfolios: Group 5 Health Care Sector Combo PRO-05 | Pharmaceuticals Portfolio

Risk/Return:

rr_RiskReturnAbstract

Risk/Return [Heading]

rr_RiskReturnHeading

Fund Summary

Fund:
Pharmaceuticals Portfolio

Objective [Heading]

rr_ObjectiveHeading

Investment Objective

Objective, Primary [Text Block]

rr_ObjectivePrimaryTextBlock

The fund seeks capital appreciation.

Expense [Heading]

rr_ExpenseHeading

Fee Table

Expense Narrative [Text Block]

rr_ExpenseNarrativeTextBlock

The following table describes the fees and expenses that may be incurred when you buy and hold shares of the fund.

Shareholder Fees Caption [Text]

rr_ShareholderFeesCaption

Shareholder fees

(fees paid directly from your investment)

rr_ShareholderFeeOther

none

Operating Expenses Caption [Text]

rr_OperatingExpensesCaption

Annual Operating Expenses

(expenses that you pay each year as a % of the value of your investment)

Portfolio Turnover [Heading]

rr_PortfolioTurnoverHeading

Portfolio Turnover

Portfolio Turnover [Text Block]

rr_PortfolioTurnoverTextBlock

The fund pays transaction costs, such as commissions, when it buys and sells securities (or "turns over" its portfolio). A higher portfolio turnover rate may indicate higher transaction costs and may result in higher taxes when fund shares are held in a taxable account. These costs, which are not reflected in annual operating expenses or in the example, affect the fund's performance. During the most recent fiscal year, the fund's portfolio turnover rate was 77% of the average value of its portfolio.

Portfolio Turnover, Rate

rr_PortfolioTurnoverRate

77.00%

Expense Example Narrative [Text Block]

rr_ExpenseExampleNarrativeTextBlock

This example helps compare the cost of investing in the fund with the cost of investing in other funds.

Let's say, hypothetically, that the annual return for shares of the fund is 5% and that your shareholder fees and the annual operating expenses for shares of the fund are exactly as described in the fee table. This example illustrates the effect of fees and expenses, but is not meant to suggest actual or expected fees and expenses or returns, all of which may vary. For every $10,000 you invested, here's how much you would pay in total expenses if you sell all of your shares at the end of each time period indicated:

Expense Example by, Year, Caption [Text]

rr_ExpenseExampleByYearCaption

Sell All Shares

Strategy [Heading]

rr_StrategyHeading

Principal Investment Strategies

Strategy Narrative [Text Block]

rr_StrategyNarrativeTextBlock

• Normally investing primarily in common stocks.

• Normally investing at least 80% of assets in companies engaged in the research, development, manufacture, sale, or distribution of pharmaceuticals and drugs of all types.

• Investing in domestic and foreign issuers.

• Using fundamental analysis of factors such as each issuer's financial condition and industry position, as well as market and economic conditions, to select investments.

Risk [Heading]

rr_RiskHeading

Principal Investment Risks

Risk Narrative [Text Block]

rr_RiskNarrativeTextBlock

• Stock Market Volatility. Stock markets are volatile and can decline significantly in response to adverse issuer, political, regulatory, market, or economic developments. Different parts of the market, including different market sectors, and different types of securities can react differently to these developments.

• Foreign Exposure. Foreign markets can be more volatile than the U.S. market due to increased risks of adverse issuer, political, regulatory, market, or economic developments and can perform differently from the U.S. market.

• Pharmaceuticals Industry Concentration. The pharmaceuticals industry can be significantly affected by government approval of products and services, government regulation and reimbursement rates, patent expirations, and intense competition.

• Issuer-Specific Changes. The value of an individual security or particular type of security can be more volatile than, and can perform differently from, the market as a whole. The value of securities of smaller issuers can be more volatile than that of larger issuers.

In addition, the fund is considered non-diversified and can invest a greater portion of assets in securities of a smaller number of individual issuers than a diversified fund. As a result, changes in the market value of a single investment could cause greater fluctuations in share price than would occur in a more diversified fund.

An investment in the fund is not a deposit of a bank and is not insured or guaranteed by the Federal Deposit Insurance Corporation or any other government agency. You could lose money by investing in the fund.

Risk Lose Money [Text]

rr_RiskLoseMoney

You could lose money by investing in the fund.

Risk Nondiversified Status [Text]

rr_RiskNondiversifiedStatus

In addition, the fund is considered non-diversified and can invest a greater portion of assets in securities of a smaller number of individual issuers than a diversified fund. As a result, changes in the market value of a single investment could cause greater fluctuations in share price than would occur in a more diversified fund.

Risk Not Insured Depository Institution [Text]

rr_RiskNotInsuredDepositoryInstitution

An investment in the fund is not a deposit of a bank and is not insured or guaranteed by the Federal Deposit Insurance Corporation or any other government agency.

Bar Chart and Performance Table [Heading]

rr_BarChartAndPerformanceTableHeading

Performance

Performance Narrative [Text Block]

rr_PerformanceNarrativeTextBlock

The following information is intended to help you understand the risks of investing in the fund. The information illustrates the changes in the performance of the fund's shares from year to year and compares the performance of the fund's shares to the performance of a securities market index and an additional index over various periods of time. The indexes have characteristics relevant to the fund's investment strategies. Index descriptions appear in the Additional Index Information section of the prospectus. Past performance (before and after taxes) is not an indication of future performance.

Visit www.fidelity.com for more recent performance information.

Performance Information Illustrates Variability of Returns [Text]

rr_PerformanceInformationIllustratesVariabilityOfReturns

The information illustrates the changes in the performance of the fund's shares from year to year and compares the performance of the fund's shares to the performance of a securities market index and an additional index over various periods of time.

Performance Availability Website Address [Text]

rr_PerformanceAvailabilityWebSiteAddress

www.fidelity.com

Performance Past Does Not Indicate Future [Text]

rr_PerformancePastDoesNotIndicateFuture

Past performance (before and after taxes) is not an indication of future performance.

Bar Chart [Heading]

rr_BarChartHeading

Year-by-Year Returns

Calendar Years

Bar Chart Closing [Text Block]

rr_BarChartClosingTextBlock

During the periods shown in the chart:	Returns	Quarter ended
Highest Quarter Return	12.70%	March 31, 2013
Lowest Quarter Return	-14.69%	March 31, 2008
Year-to-Date Return	6.81%	March 31, 2017

Performance Table Heading

rr_PerformanceTableHeading

Average Annual Returns

Performance Table Uses Highest Federal Rate

rr_PerformanceTableUsesHighestFederalRate

After-tax returns are calculated using the historical highest individual federal marginal income tax rates, but do not reflect the impact of state or local taxes.

Performance Table Not Relevant to Tax Deferred

rr_PerformanceTableNotRelevantToTaxDeferred

The after-tax returns shown are not relevant if you hold your shares in a retirement account or in another tax-deferred arrangement, such as an employee benefit plan (profit sharing, 401(k), or 403(b) plan).

Performance Table Explanation after Tax Higher

rr_PerformanceTableExplanationAfterTaxHigher

Return After Taxes on Distributions and Sale of Fund Shares may be higher than other returns for the same period due to a tax benefit of realizing a capital loss upon the sale of fund shares.

Performance Table Narrative

rr_PerformanceTableNarrativeTextBlock

After-tax returns are calculated using the historical highest individual federal marginal income tax rates, but do not reflect the impact of state or local taxes. Actual after-tax returns may differ depending on your individual circumstances. The after-tax returns shown are not relevant if you hold your shares in a retirement account or in another tax-deferred arrangement, such as an employee benefit plan (profit sharing, 401(k), or 403(b) plan). Return After Taxes on Distributions and Sale of Fund Shares may be higher than other returns for the same period due to a tax benefit of realizing a capital loss upon the sale of fund shares.

For the periods ended December 31, 2016

02.28 Select Portfolios: Group 5 Health Care Sector Combo PRO-05 | Pharmaceuticals Portfolio | Pharmaceuticals Portfolio-Default

Risk/Return:

rr_RiskReturnAbstract

Management fee

rr_ManagementFeesOverAssets

0.55%

Distribution and/or Service (12b-1) fees

rr_DistributionAndService12b1FeesOverAssets

none

Other expenses

rr_OtherExpensesOverAssets

0.25%

Total annual operating expenses

rr_ExpensesOverAssets

0.80%

1 year

rr_ExpenseExampleYear01

$ 82

3 years

rr_ExpenseExampleYear03

255

5 years

rr_ExpenseExampleYear05

444

10 years

rr_ExpenseExampleYear10

$ 990

2007

rr_AnnualReturn2007

13.40%

2008

rr_AnnualReturn2008

(22.71%)

2009

rr_AnnualReturn2009

25.41%

2010

rr_AnnualReturn2010

16.36%

2011

rr_AnnualReturn2011

13.70%

2012

rr_AnnualReturn2012

14.25%

2013

rr_AnnualReturn2013

41.36%

2014

rr_AnnualReturn2014

23.82%

2015

rr_AnnualReturn2015

8.19%

2016

rr_AnnualReturn2016

(16.27%)

Year to Date Return, Label

rr_YearToDateReturnLabel

Year-to-Date Return

Bar Chart, Year to Date Return, Date

rr_BarChartYearToDateReturnDate

Mar. 31, 2017

Bar Chart, Year to Date Return

rr_BarChartYearToDateReturn

6.81%

Highest Quarterly Return, Label

rr_HighestQuarterlyReturnLabel

Highest Quarter Return

Highest Quarterly Return, Date

rr_BarChartHighestQuarterlyReturnDate

Mar. 31, 2013

Highest Quarterly Return

rr_BarChartHighestQuarterlyReturn

12.70%

Lowest Quarterly Return, Label

rr_LowestQuarterlyReturnLabel

Lowest Quarter Return

Lowest Quarterly Return, Date

rr_BarChartLowestQuarterlyReturnDate

Mar. 31, 2008

Lowest Quarterly Return

rr_BarChartLowestQuarterlyReturn

(14.69%)

02.28 Select Portfolios: Group 5 Health Care Sector Combo PRO-05 | Pharmaceuticals Portfolio | Return Before Taxes | Pharmaceuticals Portfolio-Default

Risk/Return:

rr_RiskReturnAbstract

Column

rr_AverageAnnualReturnColumnName

Pharmaceuticals Portfolio

Label

rr_AverageAnnualReturnLabel

Return Before Taxes

Past 1 year

rr_AverageAnnualReturnYear01

(16.27%)

Past 5 years

rr_AverageAnnualReturnYear05

12.62%

Past 10 years

rr_AverageAnnualReturnYear10

10.17%

02.28 Select Portfolios: Group 5 Health Care Sector Combo PRO-05 | Pharmaceuticals Portfolio | After Taxes on Distributions | Pharmaceuticals Portfolio-Default

Risk/Return:

rr_RiskReturnAbstract

Column

rr_AverageAnnualReturnColumnName

Pharmaceuticals Portfolio

Label

rr_AverageAnnualReturnLabel

Return After Taxes on Distributions

Past 1 year

rr_AverageAnnualReturnYear01

(16.48%)

Past 5 years

rr_AverageAnnualReturnYear05

10.65%

Past 10 years

rr_AverageAnnualReturnYear10

8.95%

02.28 Select Portfolios: Group 5 Health Care Sector Combo PRO-05 | Pharmaceuticals Portfolio | After Taxes on Distributions and Sales | Pharmaceuticals Portfolio-Default

Risk/Return:

rr_RiskReturnAbstract

Column

rr_AverageAnnualReturnColumnName

Pharmaceuticals Portfolio

Label

rr_AverageAnnualReturnLabel

Return After Taxes on Distributions and Sale of Fund Shares

Past 1 year

rr_AverageAnnualReturnYear01

(9.04%)

Past 5 years

rr_AverageAnnualReturnYear05

10.03%

Past 10 years

rr_AverageAnnualReturnYear10

8.32%

02.28 Select Portfolios: Group 5 Health Care Sector Combo PRO-05 | Pharmaceuticals Portfolio | S&P 500® Index(reflects no deduction for fees, expenses, or taxes)

Risk/Return:

rr_RiskReturnAbstract

Past 1 year

rr_AverageAnnualReturnYear01

11.96%

Past 5 years

rr_AverageAnnualReturnYear05

14.66%

Past 10 years

rr_AverageAnnualReturnYear10

6.95%

02.28 Select Portfolios: Group 5 Health Care Sector Combo PRO-05 | Pharmaceuticals Portfolio | S&P® Custom Pharmaceuticals Index(reflects no deduction for fees, expenses, or taxes)

Risk/Return:

rr_RiskReturnAbstract

Past 1 year

rr_AverageAnnualReturnYear01

(13.77%)

Past 5 years

rr_AverageAnnualReturnYear05

11.72%

Past 10 years

rr_AverageAnnualReturnYear10

8.66%

XML

02.28 Select Portfolios: Group 10 Utilities Sector PRO-03 | Utilities Portfolio

Fund Summary

Fund:
Utilities Portfolio

Investment Objective

The fund seeks capital appreciation.

Fee Table

The following table describes the fees and expenses that may be incurred when you buy and hold shares of the fund.

Shareholder fees

Shareholder Fees {- Utilities Portfolio}	02.28 Select Portfolios: Group 10 Utilities Sector PRO-03 Utilities Portfolio USD ($)
(fees paid directly from your investment)	none

Annual Operating Expenses

(expenses that you pay each year as a % of the value of your investment)

Annual Operating Expenses {- Utilities Portfolio}	02.28 Select Portfolios: Group 10 Utilities Sector PRO-03 Utilities Portfolio Utilities Portfolio-Default
Management fee	0.55%
Distribution and/or Service (12b-1) fees	none
Other expenses	0.24%
Total annual operating expenses	0.79%

This example helps compare the cost of investing in the fund with the cost of investing in other funds.

Let's say, hypothetically, that the annual return for shares of the fund is 5% and that your shareholder fees and the annual operating expenses for shares of the fund are exactly as described in the fee table. This example illustrates the effect of fees and expenses, but is not meant to suggest actual or expected fees and expenses or returns, all of which may vary. For every $10,000 you invested, here's how much you would pay in total expenses if you sell all of your shares at the end of each time period indicated:

Sell All Shares

Expense Example {- Utilities Portfolio}	02.28 Select Portfolios: Group 10 Utilities Sector PRO-03 Utilities Portfolio Utilities Portfolio-Default USD ($)
1 year	$ 81
3 years	252
5 years	439
10 years	$ 978

Portfolio Turnover

The fund pays transaction costs, such as commissions, when it buys and sells securities (or "turns over" its portfolio). A higher portfolio turnover rate may indicate higher transaction costs and may result in higher taxes when fund shares are held in a taxable account. These costs, which are not reflected in annual operating expenses or in the example, affect the fund's performance. During the most recent fiscal year, the fund's portfolio turnover rate was 70% of the average value of its portfolio.

Principal Investment Strategies

• Normally investing primarily in common stocks.

• Normally investing at least 80% of assets in securities of companies principally engaged in the utilities industry and companies deriving a majority of their revenues from their utility operations.

• Investing in domestic and foreign issuers.

• Using fundamental analysis of factors such as each issuer's financial condition and industry position, as well as market and economic conditions, to select investments.

Principal Investment Risks

• Stock Market Volatility. Stock markets are volatile and can decline significantly in response to adverse issuer, political, regulatory, market, or economic developments. Different parts of the market, including different market sectors, and different types of securities can react differently to these developments.

• Foreign Exposure. Foreign markets can be more volatile than the U.S. market due to increased risks of adverse issuer, political, regulatory, market, or economic developments and can perform differently from the U.S. market.

• Utilities Industry Concentration. The utilities industries can be significantly affected by government regulation, interest rate changes, financing difficulties, supply and demand of services or fuel, intense competition, natural resource conservation, and commodity price fluctuations.

• Issuer-Specific Changes. The value of an individual security or particular type of security can be more volatile than, and can perform differently from, the market as a whole. The value of securities of smaller issuers can be more volatile than that of larger issuers.

In addition, the fund is considered non-diversified and can invest a greater portion of assets in securities of a smaller number of individual issuers than a diversified fund. As a result, changes in the market value of a single investment could cause greater fluctuations in share price than would occur in a more diversified fund.

An investment in the fund is not a deposit of a bank and is not insured or guaranteed by the Federal Deposit Insurance Corporation or any other government agency. You could lose money by investing in the fund.

Performance

The following information is intended to help you understand the risks of investing in the fund. The information illustrates the changes in the performance of the fund's shares from year to year and compares the performance of the fund's shares to the performance of a securities market index and an additional index over various periods of time. The indexes have characteristics relevant to the fund's investment strategies. Index descriptions appear in the Additional Index Information section of the prospectus. Past performance (before and after taxes) is not an indication of future performance.

Visit www.fidelity.com for more recent performance information.

Year-by-Year Returns

Calendar Years

During the periods shown in the chart:	Returns	Quarter ended
Highest Quarter Return	14.30%	March 31, 2013
Lowest Quarter Return	-26.14%	September 30, 2008
Year-to-Date Return	8.15%	March 31, 2017

Average Annual Returns

After-tax returns are calculated using the historical highest individual federal marginal income tax rates, but do not reflect the impact of state or local taxes. Actual after-tax returns may differ depending on your individual circumstances. The after-tax returns shown are not relevant if you hold your shares in a retirement account or in another tax-deferred arrangement, such as an employee benefit plan (profit sharing, 401(k), or 403(b) plan).

For the periods ended December 31, 2016

Average Annual Total Returns{- Utilities Portfolio} - 02.28 Select Portfolios: Group 10 Utilities Sector PRO-03 - Utilities Portfolio	Past 1 year	Past 5 years	Past 10 years
Utilities Portfolio-Default | Return Before Taxes	14.00%	9.79%	5.64%
Utilities Portfolio-Default | After Taxes on Distributions	13.31%	8.84%	5.00%
Utilities Portfolio-Default | After Taxes on Distributions and Sales	8.45%	7.66%	4.47%
S&P 500® Index(reflects no deduction for fees, expenses, or taxes)	11.96%	14.66%	6.95%
MSCI U.S. IMI Utilities 25-50 Index(reflects no deduction for fees, expenses, or taxes)	17.62%	10.83%	7.27%

XML

Label

Element

Value

Risk/Return:

rr_RiskReturnAbstract

Registrant Name

dei_EntityRegistrantName

FIDELITY SELECT PORTFOLIOS

Prospectus Date

rr_ProspectusDate

Apr. 29, 2017

02.28 Select Portfolios: Group 10 Utilities Sector PRO-03 | Utilities Portfolio

Risk/Return:

rr_RiskReturnAbstract

Risk/Return [Heading]

rr_RiskReturnHeading

Fund Summary

Fund:
Utilities Portfolio

Objective [Heading]

rr_ObjectiveHeading

Investment Objective

Objective, Primary [Text Block]

rr_ObjectivePrimaryTextBlock

The fund seeks capital appreciation.

Expense [Heading]

rr_ExpenseHeading

Fee Table

Expense Narrative [Text Block]

rr_ExpenseNarrativeTextBlock

The following table describes the fees and expenses that may be incurred when you buy and hold shares of the fund.

Shareholder Fees Caption [Text]

rr_ShareholderFeesCaption

Shareholder fees

(fees paid directly from your investment)

rr_ShareholderFeeOther

none

Operating Expenses Caption [Text]

rr_OperatingExpensesCaption

Annual Operating Expenses

(expenses that you pay each year as a % of the value of your investment)

Portfolio Turnover [Heading]

rr_PortfolioTurnoverHeading

Portfolio Turnover

Portfolio Turnover [Text Block]

rr_PortfolioTurnoverTextBlock

The fund pays transaction costs, such as commissions, when it buys and sells securities (or "turns over" its portfolio). A higher portfolio turnover rate may indicate higher transaction costs and may result in higher taxes when fund shares are held in a taxable account. These costs, which are not reflected in annual operating expenses or in the example, affect the fund's performance. During the most recent fiscal year, the fund's portfolio turnover rate was 70% of the average value of its portfolio.

Portfolio Turnover, Rate

rr_PortfolioTurnoverRate

70.00%

Expense Example Narrative [Text Block]

rr_ExpenseExampleNarrativeTextBlock

This example helps compare the cost of investing in the fund with the cost of investing in other funds.

Let's say, hypothetically, that the annual return for shares of the fund is 5% and that your shareholder fees and the annual operating expenses for shares of the fund are exactly as described in the fee table. This example illustrates the effect of fees and expenses, but is not meant to suggest actual or expected fees and expenses or returns, all of which may vary. For every $10,000 you invested, here's how much you would pay in total expenses if you sell all of your shares at the end of each time period indicated:

Expense Example by, Year, Caption [Text]

rr_ExpenseExampleByYearCaption

Sell All Shares

Strategy [Heading]

rr_StrategyHeading

Principal Investment Strategies

Strategy Narrative [Text Block]

rr_StrategyNarrativeTextBlock

• Normally investing primarily in common stocks.

• Normally investing at least 80% of assets in securities of companies principally engaged in the utilities industry and companies deriving a majority of their revenues from their utility operations.

• Investing in domestic and foreign issuers.

• Using fundamental analysis of factors such as each issuer's financial condition and industry position, as well as market and economic conditions, to select investments.

Strategy Portfolio Concentration [Text]

rr_StrategyPortfolioConcentration

Normally investing at least 80% of assets in securities of companies principally engaged in the utilities industry and companies deriving a majority of their revenues from their utility operations.

Risk [Heading]

rr_RiskHeading

Principal Investment Risks

Risk Narrative [Text Block]

rr_RiskNarrativeTextBlock

• Stock Market Volatility. Stock markets are volatile and can decline significantly in response to adverse issuer, political, regulatory, market, or economic developments. Different parts of the market, including different market sectors, and different types of securities can react differently to these developments.

• Foreign Exposure. Foreign markets can be more volatile than the U.S. market due to increased risks of adverse issuer, political, regulatory, market, or economic developments and can perform differently from the U.S. market.

• Utilities Industry Concentration. The utilities industries can be significantly affected by government regulation, interest rate changes, financing difficulties, supply and demand of services or fuel, intense competition, natural resource conservation, and commodity price fluctuations.

• Issuer-Specific Changes. The value of an individual security or particular type of security can be more volatile than, and can perform differently from, the market as a whole. The value of securities of smaller issuers can be more volatile than that of larger issuers.

In addition, the fund is considered non-diversified and can invest a greater portion of assets in securities of a smaller number of individual issuers than a diversified fund. As a result, changes in the market value of a single investment could cause greater fluctuations in share price than would occur in a more diversified fund.

An investment in the fund is not a deposit of a bank and is not insured or guaranteed by the Federal Deposit Insurance Corporation or any other government agency. You could lose money by investing in the fund.

Risk Lose Money [Text]

rr_RiskLoseMoney

You could lose money by investing in the fund.

Risk Nondiversified Status [Text]

rr_RiskNondiversifiedStatus

In addition, the fund is considered non-diversified and can invest a greater portion of assets in securities of a smaller number of individual issuers than a diversified fund. As a result, changes in the market value of a single investment could cause greater fluctuations in share price than would occur in a more diversified fund.

Risk Not Insured Depository Institution [Text]

rr_RiskNotInsuredDepositoryInstitution

An investment in the fund is not a deposit of a bank and is not insured or guaranteed by the Federal Deposit Insurance Corporation or any other government agency.

Bar Chart and Performance Table [Heading]

rr_BarChartAndPerformanceTableHeading

Performance

Performance Narrative [Text Block]

rr_PerformanceNarrativeTextBlock

The following information is intended to help you understand the risks of investing in the fund. The information illustrates the changes in the performance of the fund's shares from year to year and compares the performance of the fund's shares to the performance of a securities market index and an additional index over various periods of time. The indexes have characteristics relevant to the fund's investment strategies. Index descriptions appear in the Additional Index Information section of the prospectus. Past performance (before and after taxes) is not an indication of future performance.

Visit www.fidelity.com for more recent performance information.

Performance Information Illustrates Variability of Returns [Text]

rr_PerformanceInformationIllustratesVariabilityOfReturns

The information illustrates the changes in the performance of the fund's shares from year to year and compares the performance of the fund's shares to the performance of a securities market index and an additional index over various periods of time.

Performance Availability Website Address [Text]

rr_PerformanceAvailabilityWebSiteAddress

www.fidelity.com

Performance Past Does Not Indicate Future [Text]

rr_PerformancePastDoesNotIndicateFuture

Past performance (before and after taxes) is not an indication of future performance.

Bar Chart [Heading]

rr_BarChartHeading

Year-by-Year Returns

Calendar Years

Bar Chart Closing [Text Block]

rr_BarChartClosingTextBlock

During the periods shown in the chart:	Returns	Quarter ended
Highest Quarter Return	14.30%	March 31, 2013
Lowest Quarter Return	-26.14%	September 30, 2008
Year-to-Date Return	8.15%	March 31, 2017

Performance Table Heading

rr_PerformanceTableHeading

Average Annual Returns

Performance Table Uses Highest Federal Rate

rr_PerformanceTableUsesHighestFederalRate

After-tax returns are calculated using the historical highest individual federal marginal income tax rates, but do not reflect the impact of state or local taxes.

Performance Table Not Relevant to Tax Deferred

rr_PerformanceTableNotRelevantToTaxDeferred

The after-tax returns shown are not relevant if you hold your shares in a retirement account or in another tax-deferred arrangement, such as an employee benefit plan (profit sharing, 401(k), or 403(b) plan).

Performance Table Narrative

rr_PerformanceTableNarrativeTextBlock

After-tax returns are calculated using the historical highest individual federal marginal income tax rates, but do not reflect the impact of state or local taxes. Actual after-tax returns may differ depending on your individual circumstances. The after-tax returns shown are not relevant if you hold your shares in a retirement account or in another tax-deferred arrangement, such as an employee benefit plan (profit sharing, 401(k), or 403(b) plan).

For the periods ended December 31, 2016

02.28 Select Portfolios: Group 10 Utilities Sector PRO-03 | Utilities Portfolio | Utilities Portfolio-Default

Risk/Return:

rr_RiskReturnAbstract

Management fee

rr_ManagementFeesOverAssets

0.55%

Distribution and/or Service (12b-1) fees

rr_DistributionAndService12b1FeesOverAssets

none

Other expenses

rr_OtherExpensesOverAssets

0.24%

Total annual operating expenses

rr_ExpensesOverAssets

0.79%

1 year

rr_ExpenseExampleYear01

$ 81

3 years

rr_ExpenseExampleYear03

252

5 years

rr_ExpenseExampleYear05

439

10 years

rr_ExpenseExampleYear10

$ 978

2007

rr_AnnualReturn2007

18.13%

2008

rr_AnnualReturn2008

(36.00%)

2009

rr_AnnualReturn2009

14.39%

2010

rr_AnnualReturn2010

10.94%

2011

rr_AnnualReturn2011

13.09%

2012

rr_AnnualReturn2012

7.03%

2013

rr_AnnualReturn2013

20.61%

2014

rr_AnnualReturn2014

21.66%

2015

rr_AnnualReturn2015

(10.89%)

2016

rr_AnnualReturn2016

14.00%

Year to Date Return, Label

rr_YearToDateReturnLabel

Year-to-Date Return

Bar Chart, Year to Date Return, Date

rr_BarChartYearToDateReturnDate

Mar. 31, 2017

Bar Chart, Year to Date Return

rr_BarChartYearToDateReturn

8.15%

Highest Quarterly Return, Label

rr_HighestQuarterlyReturnLabel

Highest Quarter Return

Highest Quarterly Return, Date

rr_BarChartHighestQuarterlyReturnDate

Mar. 31, 2013

Highest Quarterly Return

rr_BarChartHighestQuarterlyReturn

14.30%

Lowest Quarterly Return, Label

rr_LowestQuarterlyReturnLabel

Lowest Quarter Return

Lowest Quarterly Return, Date

rr_BarChartLowestQuarterlyReturnDate

Sep. 30, 2008

Lowest Quarterly Return

rr_BarChartLowestQuarterlyReturn

(26.14%)

02.28 Select Portfolios: Group 10 Utilities Sector PRO-03 | Utilities Portfolio | Return Before Taxes | Utilities Portfolio-Default

Risk/Return:

rr_RiskReturnAbstract

Column

rr_AverageAnnualReturnColumnName

Utilities Portfolio

Label

rr_AverageAnnualReturnLabel

Return Before Taxes

Past 1 year

rr_AverageAnnualReturnYear01

14.00%

Past 5 years

rr_AverageAnnualReturnYear05

9.79%

Past 10 years

rr_AverageAnnualReturnYear10

5.64%

02.28 Select Portfolios: Group 10 Utilities Sector PRO-03 | Utilities Portfolio | After Taxes on Distributions | Utilities Portfolio-Default

Risk/Return:

rr_RiskReturnAbstract

Column

rr_AverageAnnualReturnColumnName

Utilities Portfolio

Label

rr_AverageAnnualReturnLabel

Return After Taxes on Distributions

Past 1 year

rr_AverageAnnualReturnYear01

13.31%

Past 5 years

rr_AverageAnnualReturnYear05

8.84%

Past 10 years

rr_AverageAnnualReturnYear10

5.00%

02.28 Select Portfolios: Group 10 Utilities Sector PRO-03 | Utilities Portfolio | After Taxes on Distributions and Sales | Utilities Portfolio-Default

Risk/Return:

rr_RiskReturnAbstract

Column

rr_AverageAnnualReturnColumnName

Utilities Portfolio

Label

rr_AverageAnnualReturnLabel

Return After Taxes on Distributions and Sale of Fund Shares

Past 1 year

rr_AverageAnnualReturnYear01

8.45%

Past 5 years

rr_AverageAnnualReturnYear05

7.66%

Past 10 years

rr_AverageAnnualReturnYear10

4.47%

02.28 Select Portfolios: Group 10 Utilities Sector PRO-03 | Utilities Portfolio | S&P 500® Index(reflects no deduction for fees, expenses, or taxes)

Risk/Return:

rr_RiskReturnAbstract

Past 1 year

rr_AverageAnnualReturnYear01

11.96%

Past 5 years

rr_AverageAnnualReturnYear05

14.66%

Past 10 years

rr_AverageAnnualReturnYear10

6.95%

02.28 Select Portfolios: Group 10 Utilities Sector PRO-03 | Utilities Portfolio | MSCI U.S. IMI Utilities 25-50 Index(reflects no deduction for fees, expenses, or taxes)

Risk/Return:

rr_RiskReturnAbstract

Past 1 year

rr_AverageAnnualReturnYear01

17.62%

Past 5 years

rr_AverageAnnualReturnYear05

10.83%

Past 10 years

rr_AverageAnnualReturnYear10

7.27%

XML

02.28 Select Portfolios: Group 4 Financials Sector Combo PRO-06 | Banking Portfolio

Fund Summary

Fund:
Banking Portfolio

Investment Objective

The fund seeks capital appreciation.

Fee Table

The following table describes the fees and expenses that may be incurred when you buy and hold shares of the fund.

Shareholder fees

(fees paid directly from your investment)

Shareholder Fees {- Banking Portfolio}	02.28 Select Portfolios: Group 4 Financials Sector Combo PRO-06 Banking Portfolio Banking Portfolio-Default
Redemption fee on shares held less than 30 days (as a % of amount redeemed)	0.75%

Annual Operating Expenses

(expenses that you pay each year as a % of the value of your investment)

Annual Operating Expenses {- Banking Portfolio}	02.28 Select Portfolios: Group 4 Financials Sector Combo PRO-06 Banking Portfolio Banking Portfolio-Default
Management fee	0.55%
Distribution and/or Service (12b-1) fees	none
Other expenses	0.24%
Total annual operating expenses	0.79%

This example helps compare the cost of investing in the fund with the cost of investing in other funds.

Let's say, hypothetically, that the annual return for shares of the fund is 5% and that your shareholder fees and the annual operating expenses for shares of the fund are exactly as described in the fee table. This example illustrates the effect of fees and expenses, but is not meant to suggest actual or expected fees and expenses or returns, all of which may vary. For every $10,000 you invested, here's how much you would pay in total expenses if you sell all of your shares at the end of each time period indicated:

Sell All Shares

Expense Example {- Banking Portfolio}	02.28 Select Portfolios: Group 4 Financials Sector Combo PRO-06 Banking Portfolio Banking Portfolio-Default USD ($)
1 year	$ 81
3 years	252
5 years	439
10 years	$ 978

Portfolio Turnover

The fund pays transaction costs, such as commissions, when it buys and sells securities (or "turns over" its portfolio). A higher portfolio turnover rate may indicate higher transaction costs and may result in higher taxes when fund shares are held in a taxable account. These costs, which are not reflected in annual operating expenses or in the example, affect the fund's performance. During the most recent fiscal year, the fund's portfolio turnover rate was 34% of the average value of its portfolio.

Principal Investment Strategies

• Normally investing primarily in common stocks.

• Normally investing at least 80% of assets in securities of companies principally engaged in banking.

• Investing in domestic and foreign issuers.

• Using fundamental analysis of factors such as each issuer's financial condition and industry position, as well as market and economic conditions, to select investments.

Principal Investment Risks

• Stock Market Volatility. Stock markets are volatile and can decline significantly in response to adverse issuer, political, regulatory, market, or economic developments. Different parts of the market, including different market sectors, and different types of securities can react differently to these developments.

• Foreign Exposure. Foreign markets can be more volatile than the U.S. market due to increased risks of adverse issuer, political, regulatory, market, or economic developments and can perform differently from the U.S. market.

• Banking Industry Concentration. The banking industry can be significantly affected by legislation, regulation, competition and by changes in general economic conditions and interest rates.

• Issuer-Specific Changes. The value of an individual security or particular type of security can be more volatile than, and can perform differently from, the market as a whole. The value of securities of smaller issuers can be more volatile than that of larger issuers.

An investment in the fund is not a deposit of a bank and is not insured or guaranteed by the Federal Deposit Insurance Corporation or any other government agency. You could lose money by investing in the fund.

Performance

The following information is intended to help you understand the risks of investing in the fund. The information illustrates the changes in the performance of the fund's shares from year to year and compares the performance of the fund's shares to the performance of a securities market index and an additional index over various periods of time. The indexes have characteristics relevant to the fund's investment strategies. Index descriptions appear in the Additional Index Information section of the prospectus. Past performance (before and after taxes) is not an indication of future performance.

Visit www.fidelity.com for more recent performance information.

Year-by-Year Returns

Calendar Years

During the periods shown in the chart:	Returns	Quarter ended
Highest Quarter Return	29.76%	June 30, 2009
Lowest Quarter Return	-33.33%	March 31, 2009
Year-to-Date Return	0.16%	March 31, 2017

Average Annual Returns

After-tax returns are calculated using the historical highest individual federal marginal income tax rates, but do not reflect the impact of state or local taxes. Actual after-tax returns may differ depending on your individual circumstances. The after-tax returns shown are not relevant if you hold your shares in a retirement account or in another tax-deferred arrangement, such as an employee benefit plan (profit sharing, 401(k), or 403(b) plan).

For the periods ended December 31, 2016

Average Annual Total Returns{- Banking Portfolio} - 02.28 Select Portfolios: Group 4 Financials Sector Combo PRO-06 - Banking Portfolio	Past 1 year	Past 5 years	Past 10 years
Banking Portfolio-Default | Return Before Taxes	26.84%	18.57%	2.48%
Banking Portfolio-Default | After Taxes on Distributions	26.61%	17.74%	1.87%
Banking Portfolio-Default | After Taxes on Distributions and Sales	15.38%	14.96%	1.84%
S&P 500® Index(reflects no deduction for fees, expenses, or taxes)	11.96%	14.66%	6.95%
MSCI US IMI Banks 5% Capped Linked Index(reflects no deduction for fees, expenses, or taxes)	33.36%	20.49%	0.25%

XML

Label

Element

Value

Risk/Return:

rr_RiskReturnAbstract

Registrant Name

dei_EntityRegistrantName

FIDELITY SELECT PORTFOLIOS

Prospectus Date

rr_ProspectusDate

Apr. 29, 2017

02.28 Select Portfolios: Group 4 Financials Sector Combo PRO-06 | Banking Portfolio

Risk/Return:

rr_RiskReturnAbstract

Risk/Return [Heading]

rr_RiskReturnHeading

Fund Summary

Fund:
Banking Portfolio

Objective [Heading]

rr_ObjectiveHeading

Investment Objective

Objective, Primary [Text Block]

rr_ObjectivePrimaryTextBlock

The fund seeks capital appreciation.

Expense [Heading]

rr_ExpenseHeading

Fee Table

Expense Narrative [Text Block]

rr_ExpenseNarrativeTextBlock

The following table describes the fees and expenses that may be incurred when you buy and hold shares of the fund.

Shareholder Fees Caption [Text]

rr_ShareholderFeesCaption

Shareholder fees

(fees paid directly from your investment)

Operating Expenses Caption [Text]

rr_OperatingExpensesCaption

Annual Operating Expenses

(expenses that you pay each year as a % of the value of your investment)

Portfolio Turnover [Heading]

rr_PortfolioTurnoverHeading

Portfolio Turnover

Portfolio Turnover [Text Block]

rr_PortfolioTurnoverTextBlock

The fund pays transaction costs, such as commissions, when it buys and sells securities (or "turns over" its portfolio). A higher portfolio turnover rate may indicate higher transaction costs and may result in higher taxes when fund shares are held in a taxable account. These costs, which are not reflected in annual operating expenses or in the example, affect the fund's performance. During the most recent fiscal year, the fund's portfolio turnover rate was 34% of the average value of its portfolio.

Portfolio Turnover, Rate

rr_PortfolioTurnoverRate

34.00%

Expense Example Narrative [Text Block]

rr_ExpenseExampleNarrativeTextBlock

This example helps compare the cost of investing in the fund with the cost of investing in other funds.

Let's say, hypothetically, that the annual return for shares of the fund is 5% and that your shareholder fees and the annual operating expenses for shares of the fund are exactly as described in the fee table. This example illustrates the effect of fees and expenses, but is not meant to suggest actual or expected fees and expenses or returns, all of which may vary. For every $10,000 you invested, here's how much you would pay in total expenses if you sell all of your shares at the end of each time period indicated:

Expense Example by, Year, Caption [Text]

rr_ExpenseExampleByYearCaption

Sell All Shares

Strategy [Heading]

rr_StrategyHeading

Principal Investment Strategies

Strategy Narrative [Text Block]

rr_StrategyNarrativeTextBlock

• Normally investing primarily in common stocks.

• Normally investing at least 80% of assets in securities of companies principally engaged in banking.

• Investing in domestic and foreign issuers.

• Using fundamental analysis of factors such as each issuer's financial condition and industry position, as well as market and economic conditions, to select investments.

Strategy Portfolio Concentration [Text]

rr_StrategyPortfolioConcentration

Normally investing at least 80% of assets in securities of companies principally engaged in banking.

Risk [Heading]

rr_RiskHeading

Principal Investment Risks

Risk Narrative [Text Block]

rr_RiskNarrativeTextBlock

• Stock Market Volatility. Stock markets are volatile and can decline significantly in response to adverse issuer, political, regulatory, market, or economic developments. Different parts of the market, including different market sectors, and different types of securities can react differently to these developments.

• Foreign Exposure. Foreign markets can be more volatile than the U.S. market due to increased risks of adverse issuer, political, regulatory, market, or economic developments and can perform differently from the U.S. market.

• Banking Industry Concentration. The banking industry can be significantly affected by legislation, regulation, competition and by changes in general economic conditions and interest rates.

• Issuer-Specific Changes. The value of an individual security or particular type of security can be more volatile than, and can perform differently from, the market as a whole. The value of securities of smaller issuers can be more volatile than that of larger issuers.

An investment in the fund is not a deposit of a bank and is not insured or guaranteed by the Federal Deposit Insurance Corporation or any other government agency. You could lose money by investing in the fund.

Risk Lose Money [Text]

rr_RiskLoseMoney

You could lose money by investing in the fund.

Risk Not Insured Depository Institution [Text]

rr_RiskNotInsuredDepositoryInstitution

An investment in the fund is not a deposit of a bank and is not insured or guaranteed by the Federal Deposit Insurance Corporation or any other government agency.

Bar Chart and Performance Table [Heading]

rr_BarChartAndPerformanceTableHeading

Performance

Performance Narrative [Text Block]

rr_PerformanceNarrativeTextBlock

The following information is intended to help you understand the risks of investing in the fund. The information illustrates the changes in the performance of the fund's shares from year to year and compares the performance of the fund's shares to the performance of a securities market index and an additional index over various periods of time. The indexes have characteristics relevant to the fund's investment strategies. Index descriptions appear in the Additional Index Information section of the prospectus. Past performance (before and after taxes) is not an indication of future performance.

Visit www.fidelity.com for more recent performance information.

Performance Information Illustrates Variability of Returns [Text]

rr_PerformanceInformationIllustratesVariabilityOfReturns

The information illustrates the changes in the performance of the fund's shares from year to year and compares the performance of the fund's shares to the performance of a securities market index and an additional index over various periods of time.

Performance Availability Website Address [Text]

rr_PerformanceAvailabilityWebSiteAddress

www.fidelity.com

Performance Past Does Not Indicate Future [Text]

rr_PerformancePastDoesNotIndicateFuture

Past performance (before and after taxes) is not an indication of future performance.

Bar Chart [Heading]

rr_BarChartHeading

Year-by-Year Returns

Calendar Years

Bar Chart Closing [Text Block]

rr_BarChartClosingTextBlock

During the periods shown in the chart:	Returns	Quarter ended
Highest Quarter Return	29.76%	June 30, 2009
Lowest Quarter Return	-33.33%	March 31, 2009
Year-to-Date Return	0.16%	March 31, 2017

Performance Table Heading

rr_PerformanceTableHeading

Average Annual Returns

Performance Table Uses Highest Federal Rate

rr_PerformanceTableUsesHighestFederalRate

After-tax returns are calculated using the historical highest individual federal marginal income tax rates, but do not reflect the impact of state or local taxes.

Performance Table Not Relevant to Tax Deferred

rr_PerformanceTableNotRelevantToTaxDeferred

The after-tax returns shown are not relevant if you hold your shares in a retirement account or in another tax-deferred arrangement, such as an employee benefit plan (profit sharing, 401(k), or 403(b) plan).

Performance Table Narrative

rr_PerformanceTableNarrativeTextBlock

After-tax returns are calculated using the historical highest individual federal marginal income tax rates, but do not reflect the impact of state or local taxes. Actual after-tax returns may differ depending on your individual circumstances. The after-tax returns shown are not relevant if you hold your shares in a retirement account or in another tax-deferred arrangement, such as an employee benefit plan (profit sharing, 401(k), or 403(b) plan).

For the periods ended December 31, 2016

02.28 Select Portfolios: Group 4 Financials Sector Combo PRO-06 | Banking Portfolio | Banking Portfolio-Default

Risk/Return:

rr_RiskReturnAbstract

Redemption fee on shares held less than 30 days (as a % of amount redeemed)

rr_RedemptionFeeOverRedemption

0.75%

Management fee

rr_ManagementFeesOverAssets

0.55%

Distribution and/or Service (12b-1) fees

rr_DistributionAndService12b1FeesOverAssets

none

Other expenses

rr_OtherExpensesOverAssets

0.24%

Total annual operating expenses

rr_ExpensesOverAssets

0.79%

1 year

rr_ExpenseExampleYear01

$ 81

3 years

rr_ExpenseExampleYear03

252

5 years

rr_ExpenseExampleYear05

439

10 years

rr_ExpenseExampleYear10

$ 978

2007

rr_AnnualReturn2007

(21.18%)

2008

rr_AnnualReturn2008

(37.48%)

2009

rr_AnnualReturn2009

5.05%

2010

rr_AnnualReturn2010

21.44%

2011

rr_AnnualReturn2011

(13.31%)

2012

rr_AnnualReturn2012

22.42%

2013

rr_AnnualReturn2013

39.38%

2014

rr_AnnualReturn2014

7.58%

2015

rr_AnnualReturn2015

0.65%

2016

rr_AnnualReturn2016

26.84%

Year to Date Return, Label

rr_YearToDateReturnLabel

Year-to-Date Return

Bar Chart, Year to Date Return, Date

rr_BarChartYearToDateReturnDate

Mar. 31, 2017

Bar Chart, Year to Date Return

rr_BarChartYearToDateReturn

0.16%

Highest Quarterly Return, Label

rr_HighestQuarterlyReturnLabel

Highest Quarter Return

Highest Quarterly Return, Date

rr_BarChartHighestQuarterlyReturnDate

Jun. 30, 2009

Highest Quarterly Return

rr_BarChartHighestQuarterlyReturn

29.76%

Lowest Quarterly Return, Label

rr_LowestQuarterlyReturnLabel

Lowest Quarter Return

Lowest Quarterly Return, Date

rr_BarChartLowestQuarterlyReturnDate

Mar. 31, 2009

Lowest Quarterly Return

rr_BarChartLowestQuarterlyReturn

(33.33%)

02.28 Select Portfolios: Group 4 Financials Sector Combo PRO-06 | Banking Portfolio | Return Before Taxes | Banking Portfolio-Default

Risk/Return:

rr_RiskReturnAbstract

Column

rr_AverageAnnualReturnColumnName

Banking Portfolio

Label

rr_AverageAnnualReturnLabel

Return Before Taxes

Past 1 year

rr_AverageAnnualReturnYear01

26.84%

Past 5 years

rr_AverageAnnualReturnYear05

18.57%

Past 10 years

rr_AverageAnnualReturnYear10

2.48%

02.28 Select Portfolios: Group 4 Financials Sector Combo PRO-06 | Banking Portfolio | After Taxes on Distributions | Banking Portfolio-Default

Risk/Return:

rr_RiskReturnAbstract

Column

rr_AverageAnnualReturnColumnName

Banking Portfolio

Label

rr_AverageAnnualReturnLabel

Return After Taxes on Distributions

Past 1 year

rr_AverageAnnualReturnYear01

26.61%

Past 5 years

rr_AverageAnnualReturnYear05

17.74%

Past 10 years

rr_AverageAnnualReturnYear10

1.87%

02.28 Select Portfolios: Group 4 Financials Sector Combo PRO-06 | Banking Portfolio | After Taxes on Distributions and Sales | Banking Portfolio-Default

Risk/Return:

rr_RiskReturnAbstract

Column

rr_AverageAnnualReturnColumnName

Banking Portfolio

Label

rr_AverageAnnualReturnLabel

Return After Taxes on Distributions and Sale of Fund Shares

Past 1 year

rr_AverageAnnualReturnYear01

15.38%

Past 5 years

rr_AverageAnnualReturnYear05

14.96%

Past 10 years

rr_AverageAnnualReturnYear10

1.84%

02.28 Select Portfolios: Group 4 Financials Sector Combo PRO-06 | Banking Portfolio | S&P 500® Index(reflects no deduction for fees, expenses, or taxes)

Risk/Return:

rr_RiskReturnAbstract

Past 1 year

rr_AverageAnnualReturnYear01

11.96%

Past 5 years

rr_AverageAnnualReturnYear05

14.66%

Past 10 years

rr_AverageAnnualReturnYear10

6.95%

02.28 Select Portfolios: Group 4 Financials Sector Combo PRO-06 | Banking Portfolio | MSCI US IMI Banks 5% Capped Linked Index(reflects no deduction for fees, expenses, or taxes)

Risk/Return:

rr_RiskReturnAbstract

Past 1 year

rr_AverageAnnualReturnYear01

33.36%

Past 5 years

rr_AverageAnnualReturnYear05

20.49%

Past 10 years

rr_AverageAnnualReturnYear10

0.25%

XML

02.28 Select Portfolios: Group 4 Financials Sector Combo PRO-06 | Brokerage and Investment Management Portfolio

Fund Summary

Fund:
Brokerage and Investment Management Portfolio

Investment Objective

The fund seeks capital appreciation.

Fee Table

The following table describes the fees and expenses that may be incurred when you buy and hold shares of the fund.

Shareholder fees

(fees paid directly from your investment)

Shareholder Fees {- Brokerage and Investment Management Portfolio}	02.28 Select Portfolios: Group 4 Financials Sector Combo PRO-06 Brokerage and Investment Management Portfolio Brokerage and Investment Management Portfolio-Default
Redemption fee on shares held less than 30 days (as a % of amount redeemed)	0.75%

Annual Operating Expenses

(expenses that you pay each year as a % of the value of your investment)

Annual Operating Expenses {- Brokerage and Investment Management Portfolio}	02.28 Select Portfolios: Group 4 Financials Sector Combo PRO-06 Brokerage and Investment Management Portfolio Brokerage and Investment Management Portfolio-Default
Management fee	0.55%
Distribution and/or Service (12b-1) fees	none
Other expenses	0.27%
Total annual operating expenses	0.82%

This example helps compare the cost of investing in the fund with the cost of investing in other funds.

Let's say, hypothetically, that the annual return for shares of the fund is 5% and that your shareholder fees and the annual operating expenses for shares of the fund are exactly as described in the fee table. This example illustrates the effect of fees and expenses, but is not meant to suggest actual or expected fees and expenses or returns, all of which may vary. For every $10,000 you invested, here's how much you would pay in total expenses if you sell all of your shares at the end of each time period indicated:

Sell All Shares

Expense Example {- Brokerage and Investment Management Portfolio}	02.28 Select Portfolios: Group 4 Financials Sector Combo PRO-06 Brokerage and Investment Management Portfolio Brokerage and Investment Management Portfolio-Default USD ($)
1 year	$ 84
3 years	262
5 years	455
10 years	$ 1,014

Portfolio Turnover

The fund pays transaction costs, such as commissions, when it buys and sells securities (or "turns over" its portfolio). A higher portfolio turnover rate may indicate higher transaction costs and may result in higher taxes when fund shares are held in a taxable account. These costs, which are not reflected in annual operating expenses or in the example, affect the fund's performance. During the most recent fiscal year, the fund's portfolio turnover rate was 146% of the average value of its portfolio.

Principal Investment Strategies

• Normally investing primarily in common stocks.

• Normally investing at least 80% of assets in securities of companies principally engaged in stock brokerage, commodity brokerage, investment banking, tax-advantaged investment or investment sales, investment management, or related investment advisory services.

• Investing in domestic and foreign issuers.

• Using fundamental analysis of factors such as each issuer's financial condition and industry position, as well as market and economic conditions, to select investments.

Principal Investment Risks

• Stock Market Volatility. Stock markets are volatile and can decline significantly in response to adverse issuer, political, regulatory, market, or economic developments. Different parts of the market, including different market sectors, and different types of securities can react differently to these developments.

• Foreign Exposure. Foreign markets can be more volatile than the U.S. market due to increased risks of adverse issuer, political, regulatory, market, or economic developments and can perform differently from the U.S. market.

• Brokerage and Investment Management Industry Concentration. The brokerage and investment management industry can be significantly affected by stock and bond market activity, changes in regulations, brokerage commission structure, and a competitive environment combined with the high operating leverage inherent in companies in this industry.

• Issuer-Specific Changes. The value of an individual security or particular type of security can be more volatile than, and can perform differently from, the market as a whole. The value of securities of smaller issuers can be more volatile than that of larger issuers.

In addition, the fund is considered non-diversified and can invest a greater portion of assets in securities of a smaller number of individual issuers than a diversified fund. As a result, changes in the market value of a single investment could cause greater fluctuations in share price than would occur in a more diversified fund.

An investment in the fund is not a deposit of a bank and is not insured or guaranteed by the Federal Deposit Insurance Corporation or any other government agency. You could lose money by investing in the fund.

Performance

The following information is intended to help you understand the risks of investing in the fund. The information illustrates the changes in the performance of the fund's shares from year to year and compares the performance of the fund's shares to the performance of a securities market index and an additional index over various periods of time. The indexes have characteristics relevant to the fund's investment strategies. Index descriptions appear in the Additional Index Information section of the prospectus. Past performance (before and after taxes) is not an indication of future performance.

Visit www.fidelity.com for more recent performance information.

Year-by-Year Returns

Calendar Years

During the periods shown in the chart:	Returns	Quarter ended
Highest Quarter Return	42.98%	June 30, 2009
Lowest Quarter Return	-29.70%	December 31, 2008
Year-to-Date Return	4.03%	March 31, 2017

Average Annual Returns

After-tax returns are calculated using the historical highest individual federal marginal income tax rates, but do not reflect the impact of state or local taxes. Actual after-tax returns may differ depending on your individual circumstances. The after-tax returns shown are not relevant if you hold your shares in a retirement account or in another tax-deferred arrangement, such as an employee benefit plan (profit sharing, 401(k), or 403(b) plan). Return After Taxes on Distributions and Sale of Fund Shares may be higher than other returns for the same period due to a tax benefit of realizing a capital loss upon the sale of fund shares.

For the periods ended December 31, 2016

Average Annual Total Returns{- Brokerage and Investment Management Portfolio} - 02.28 Select Portfolios: Group 4 Financials Sector Combo PRO-06 - Brokerage and Investment Management Portfolio	Past 1 year	Past 5 years	Past 10 years
Brokerage and Investment Management Portfolio-Default | Return Before Taxes	6.70%	14.13%	2.38%
Brokerage and Investment Management Portfolio-Default | After Taxes on Distributions	6.39%	13.43%	1.76%
Brokerage and Investment Management Portfolio-Default | After Taxes on Distributions and Sales	4.05%	11.35%	1.88%
S&P 500® Index(reflects no deduction for fees, expenses, or taxes)	11.96%	14.66%	6.95%
MSCI U.S. IMI Capital Markets 5% Capped Linked Index(reflects no deduction for fees, expenses, or taxes)	9.98%	15.16%	(0.07%)

XML

Label

Element

Value

Risk/Return:

rr_RiskReturnAbstract

Registrant Name

dei_EntityRegistrantName

FIDELITY SELECT PORTFOLIOS

Prospectus Date

rr_ProspectusDate

Apr. 29, 2017

02.28 Select Portfolios: Group 4 Financials Sector Combo PRO-06 | Brokerage and Investment Management Portfolio

Risk/Return:

rr_RiskReturnAbstract

Risk/Return [Heading]

rr_RiskReturnHeading

Fund Summary

Fund:
Brokerage and Investment Management Portfolio

Objective [Heading]

rr_ObjectiveHeading

Investment Objective

Objective, Primary [Text Block]

rr_ObjectivePrimaryTextBlock

The fund seeks capital appreciation.

Expense [Heading]

rr_ExpenseHeading

Fee Table

Expense Narrative [Text Block]

rr_ExpenseNarrativeTextBlock

The following table describes the fees and expenses that may be incurred when you buy and hold shares of the fund.

Shareholder Fees Caption [Text]

rr_ShareholderFeesCaption

Shareholder fees

(fees paid directly from your investment)

Operating Expenses Caption [Text]

rr_OperatingExpensesCaption

Annual Operating Expenses

(expenses that you pay each year as a % of the value of your investment)

Portfolio Turnover [Heading]

rr_PortfolioTurnoverHeading

Portfolio Turnover

Portfolio Turnover [Text Block]

rr_PortfolioTurnoverTextBlock

The fund pays transaction costs, such as commissions, when it buys and sells securities (or "turns over" its portfolio). A higher portfolio turnover rate may indicate higher transaction costs and may result in higher taxes when fund shares are held in a taxable account. These costs, which are not reflected in annual operating expenses or in the example, affect the fund's performance. During the most recent fiscal year, the fund's portfolio turnover rate was 146% of the average value of its portfolio.

Portfolio Turnover, Rate

rr_PortfolioTurnoverRate

146.00%

Expense Example Narrative [Text Block]

rr_ExpenseExampleNarrativeTextBlock

This example helps compare the cost of investing in the fund with the cost of investing in other funds.

Let's say, hypothetically, that the annual return for shares of the fund is 5% and that your shareholder fees and the annual operating expenses for shares of the fund are exactly as described in the fee table. This example illustrates the effect of fees and expenses, but is not meant to suggest actual or expected fees and expenses or returns, all of which may vary. For every $10,000 you invested, here's how much you would pay in total expenses if you sell all of your shares at the end of each time period indicated:

Expense Example by, Year, Caption [Text]

rr_ExpenseExampleByYearCaption

Sell All Shares

Strategy [Heading]

rr_StrategyHeading

Principal Investment Strategies

Strategy Narrative [Text Block]

rr_StrategyNarrativeTextBlock

• Normally investing primarily in common stocks.

• Normally investing at least 80% of assets in securities of companies principally engaged in stock brokerage, commodity brokerage, investment banking, tax-advantaged investment or investment sales, investment management, or related investment advisory services.

• Investing in domestic and foreign issuers.

• Using fundamental analysis of factors such as each issuer's financial condition and industry position, as well as market and economic conditions, to select investments.

Strategy Portfolio Concentration [Text]

rr_StrategyPortfolioConcentration

Normally investing at least 80% of assets in securities of companies principally engaged in stock brokerage, commodity brokerage, investment banking, tax-advantaged investment or investment sales, investment management, or related investment advisory services.

Risk [Heading]

rr_RiskHeading

Principal Investment Risks

Risk Narrative [Text Block]

rr_RiskNarrativeTextBlock

• Stock Market Volatility. Stock markets are volatile and can decline significantly in response to adverse issuer, political, regulatory, market, or economic developments. Different parts of the market, including different market sectors, and different types of securities can react differently to these developments.

• Foreign Exposure. Foreign markets can be more volatile than the U.S. market due to increased risks of adverse issuer, political, regulatory, market, or economic developments and can perform differently from the U.S. market.

• Brokerage and Investment Management Industry Concentration. The brokerage and investment management industry can be significantly affected by stock and bond market activity, changes in regulations, brokerage commission structure, and a competitive environment combined with the high operating leverage inherent in companies in this industry.

• Issuer-Specific Changes. The value of an individual security or particular type of security can be more volatile than, and can perform differently from, the market as a whole. The value of securities of smaller issuers can be more volatile than that of larger issuers.

In addition, the fund is considered non-diversified and can invest a greater portion of assets in securities of a smaller number of individual issuers than a diversified fund. As a result, changes in the market value of a single investment could cause greater fluctuations in share price than would occur in a more diversified fund.

An investment in the fund is not a deposit of a bank and is not insured or guaranteed by the Federal Deposit Insurance Corporation or any other government agency. You could lose money by investing in the fund.

Risk Lose Money [Text]

rr_RiskLoseMoney

You could lose money by investing in the fund.

Risk Nondiversified Status [Text]

rr_RiskNondiversifiedStatus

In addition, the fund is considered non-diversified and can invest a greater portion of assets in securities of a smaller number of individual issuers than a diversified fund. As a result, changes in the market value of a single investment could cause greater fluctuations in share price than would occur in a more diversified fund.

Risk Not Insured Depository Institution [Text]

rr_RiskNotInsuredDepositoryInstitution

An investment in the fund is not a deposit of a bank and is not insured or guaranteed by the Federal Deposit Insurance Corporation or any other government agency.

Bar Chart and Performance Table [Heading]

rr_BarChartAndPerformanceTableHeading

Performance

Performance Narrative [Text Block]

rr_PerformanceNarrativeTextBlock

The following information is intended to help you understand the risks of investing in the fund. The information illustrates the changes in the performance of the fund's shares from year to year and compares the performance of the fund's shares to the performance of a securities market index and an additional index over various periods of time. The indexes have characteristics relevant to the fund's investment strategies. Index descriptions appear in the Additional Index Information section of the prospectus. Past performance (before and after taxes) is not an indication of future performance.

Visit www.fidelity.com for more recent performance information.

Performance Information Illustrates Variability of Returns [Text]

rr_PerformanceInformationIllustratesVariabilityOfReturns

The information illustrates the changes in the performance of the fund's shares from year to year and compares the performance of the fund's shares to the performance of a securities market index and an additional index over various periods of time.

Performance Availability Website Address [Text]

rr_PerformanceAvailabilityWebSiteAddress

www.fidelity.com

Performance Past Does Not Indicate Future [Text]

rr_PerformancePastDoesNotIndicateFuture

Past performance (before and after taxes) is not an indication of future performance.

Bar Chart [Heading]

rr_BarChartHeading

Year-by-Year Returns

Calendar Years

Bar Chart Closing [Text Block]

rr_BarChartClosingTextBlock

During the periods shown in the chart:	Returns	Quarter ended
Highest Quarter Return	42.98%	June 30, 2009
Lowest Quarter Return	-29.70%	December 31, 2008
Year-to-Date Return	4.03%	March 31, 2017

Performance Table Heading

rr_PerformanceTableHeading

Average Annual Returns

Performance Table Uses Highest Federal Rate

rr_PerformanceTableUsesHighestFederalRate

After-tax returns are calculated using the historical highest individual federal marginal income tax rates, but do not reflect the impact of state or local taxes.

Performance Table Not Relevant to Tax Deferred

rr_PerformanceTableNotRelevantToTaxDeferred

The after-tax returns shown are not relevant if you hold your shares in a retirement account or in another tax-deferred arrangement, such as an employee benefit plan (profit sharing, 401(k), or 403(b) plan).

Performance Table Explanation after Tax Higher

rr_PerformanceTableExplanationAfterTaxHigher

Return After Taxes on Distributions and Sale of Fund Shares may be higher than other returns for the same period due to a tax benefit of realizing a capital loss upon the sale of fund shares.

Performance Table Narrative

rr_PerformanceTableNarrativeTextBlock

After-tax returns are calculated using the historical highest individual federal marginal income tax rates, but do not reflect the impact of state or local taxes. Actual after-tax returns may differ depending on your individual circumstances. The after-tax returns shown are not relevant if you hold your shares in a retirement account or in another tax-deferred arrangement, such as an employee benefit plan (profit sharing, 401(k), or 403(b) plan). Return After Taxes on Distributions and Sale of Fund Shares may be higher than other returns for the same period due to a tax benefit of realizing a capital loss upon the sale of fund shares.

For the periods ended December 31, 2016

02.28 Select Portfolios: Group 4 Financials Sector Combo PRO-06 | Brokerage and Investment Management Portfolio | Brokerage and Investment Management Portfolio-Default

Risk/Return:

rr_RiskReturnAbstract

Redemption fee on shares held less than 30 days (as a % of amount redeemed)

rr_RedemptionFeeOverRedemption

0.75%

Management fee

rr_ManagementFeesOverAssets

0.55%

Distribution and/or Service (12b-1) fees

rr_DistributionAndService12b1FeesOverAssets

none

Other expenses

rr_OtherExpensesOverAssets

0.27%

Total annual operating expenses

rr_ExpensesOverAssets

0.82%

1 year

rr_ExpenseExampleYear01

$ 84

3 years

rr_ExpenseExampleYear03

262

5 years

rr_ExpenseExampleYear05

455

10 years

rr_ExpenseExampleYear10

$ 1,014

2007

rr_AnnualReturn2007

(0.15%)

2008

rr_AnnualReturn2008

(49.31%)

2009

rr_AnnualReturn2009

50.41%

2010

rr_AnnualReturn2010

11.20%

2011

rr_AnnualReturn2011

(22.84%)

2012

rr_AnnualReturn2012

28.31%

2013

rr_AnnualReturn2013

48.87%

2014

rr_AnnualReturn2014

5.24%

2015

rr_AnnualReturn2015

(9.71%)

2016

rr_AnnualReturn2016

6.70%

Year to Date Return, Label

rr_YearToDateReturnLabel

Year-to-Date Return

Bar Chart, Year to Date Return, Date

rr_BarChartYearToDateReturnDate

Mar. 31, 2017

Bar Chart, Year to Date Return

rr_BarChartYearToDateReturn

4.03%

Highest Quarterly Return, Label

rr_HighestQuarterlyReturnLabel

Highest Quarter Return

Highest Quarterly Return, Date

rr_BarChartHighestQuarterlyReturnDate

Jun. 30, 2009

Highest Quarterly Return

rr_BarChartHighestQuarterlyReturn

42.98%

Lowest Quarterly Return, Label

rr_LowestQuarterlyReturnLabel

Lowest Quarter Return

Lowest Quarterly Return, Date

rr_BarChartLowestQuarterlyReturnDate

Dec. 31, 2008

Lowest Quarterly Return

rr_BarChartLowestQuarterlyReturn

(29.70%)

02.28 Select Portfolios: Group 4 Financials Sector Combo PRO-06 | Brokerage and Investment Management Portfolio | Return Before Taxes | Brokerage and Investment Management Portfolio-Default

Risk/Return:

rr_RiskReturnAbstract

Column

rr_AverageAnnualReturnColumnName

Brokerage and Investment Management Portfolio

Label

rr_AverageAnnualReturnLabel

Return Before Taxes

Past 1 year

rr_AverageAnnualReturnYear01

6.70%

Past 5 years

rr_AverageAnnualReturnYear05

14.13%

Past 10 years

rr_AverageAnnualReturnYear10

2.38%

02.28 Select Portfolios: Group 4 Financials Sector Combo PRO-06 | Brokerage and Investment Management Portfolio | After Taxes on Distributions | Brokerage and Investment Management Portfolio-Default

Risk/Return:

rr_RiskReturnAbstract

Column

rr_AverageAnnualReturnColumnName

Brokerage and Investment Management Portfolio

Label

rr_AverageAnnualReturnLabel

Return After Taxes on Distributions

Past 1 year

rr_AverageAnnualReturnYear01

6.39%

Past 5 years

rr_AverageAnnualReturnYear05

13.43%

Past 10 years

rr_AverageAnnualReturnYear10

1.76%

02.28 Select Portfolios: Group 4 Financials Sector Combo PRO-06 | Brokerage and Investment Management Portfolio | After Taxes on Distributions and Sales | Brokerage and Investment Management Portfolio-Default

Risk/Return:

rr_RiskReturnAbstract

Column

rr_AverageAnnualReturnColumnName

Brokerage and Investment Management Portfolio

Label

rr_AverageAnnualReturnLabel

Return After Taxes on Distributions and Sale of Fund Shares

Past 1 year

rr_AverageAnnualReturnYear01

4.05%

Past 5 years

rr_AverageAnnualReturnYear05

11.35%

Past 10 years

rr_AverageAnnualReturnYear10

1.88%

02.28 Select Portfolios: Group 4 Financials Sector Combo PRO-06 | Brokerage and Investment Management Portfolio | S&P 500® Index(reflects no deduction for fees, expenses, or taxes)

Risk/Return:

rr_RiskReturnAbstract

Past 1 year

rr_AverageAnnualReturnYear01

11.96%

Past 5 years

rr_AverageAnnualReturnYear05

14.66%

Past 10 years

rr_AverageAnnualReturnYear10

6.95%

02.28 Select Portfolios: Group 4 Financials Sector Combo PRO-06 | Brokerage and Investment Management Portfolio | MSCI U.S. IMI Capital Markets 5% Capped Linked Index(reflects no deduction for fees, expenses, or taxes)

Risk/Return:

rr_RiskReturnAbstract

Past 1 year

rr_AverageAnnualReturnYear01

9.98%

Past 5 years

rr_AverageAnnualReturnYear05

15.16%

Past 10 years

rr_AverageAnnualReturnYear10

(0.07%)

XML

02.28 Select Portfolios: Group 4 Financials Sector Combo PRO-06 | Consumer Finance Portfolio

Fund Summary

Fund:
Consumer Finance Portfolio

Investment Objective

The fund seeks capital appreciation.

Fee Table

The following table describes the fees and expenses that may be incurred when you buy and hold shares of the fund.

Shareholder fees

(fees paid directly from your investment)

Shareholder Fees {- Consumer Finance Portfolio}	02.28 Select Portfolios: Group 4 Financials Sector Combo PRO-06 Consumer Finance Portfolio Consumer Finance Portfolio-Default
Redemption fee on shares held less than 30 days (as a % of amount redeemed)	0.75%

Annual Operating Expenses

(expenses that you pay each year as a % of the value of your investment)

Annual Operating Expenses {- Consumer Finance Portfolio}	02.28 Select Portfolios: Group 4 Financials Sector Combo PRO-06 Consumer Finance Portfolio Consumer Finance Portfolio-Default
Management fee	0.55%
Distribution and/or Service (12b-1) fees	none
Other expenses	0.39%
Total annual operating expenses	0.94%

This example helps compare the cost of investing in the fund with the cost of investing in other funds.

Let's say, hypothetically, that the annual return for shares of the fund is 5% and that your shareholder fees and the annual operating expenses for shares of the fund are exactly as described in the fee table. This example illustrates the effect of fees and expenses, but is not meant to suggest actual or expected fees and expenses or returns, all of which may vary. For every $10,000 you invested, here's how much you would pay in total expenses if you sell all of your shares at the end of each time period indicated:

Sell All Shares

Expense Example {- Consumer Finance Portfolio}	02.28 Select Portfolios: Group 4 Financials Sector Combo PRO-06 Consumer Finance Portfolio Consumer Finance Portfolio-Default USD ($)
1 year	$ 96
3 years	300
5 years	520
10 years	$ 1,155

Portfolio Turnover

The fund pays transaction costs, such as commissions, when it buys and sells securities (or "turns over" its portfolio). A higher portfolio turnover rate may indicate higher transaction costs and may result in higher taxes when fund shares are held in a taxable account. These costs, which are not reflected in annual operating expenses or in the example, affect the fund's performance. During the most recent fiscal year, the fund's portfolio turnover rate was 44% of the average value of its portfolio.

Principal Investment Strategies

• Normally investing primarily in common stocks.

• Normally investing at least 80% of assets in securities of companies principally engaged in providing products and services associated with consumer finance.

• Investing in domestic and foreign issuers.

• Using fundamental analysis of factors such as each issuer's financial condition and industry position, as well as market and economic conditions, to select investments.

Principal Investment Risks

• Stock Market Volatility. Stock markets are volatile and can decline significantly in response to adverse issuer, political, regulatory, market, or economic developments. Different parts of the market, including different market sectors, and different types of securities can react differently to these developments.

• Foreign Exposure. Foreign markets can be more volatile than the U.S. market due to increased risks of adverse issuer, political, regulatory, market, or economic developments and can perform differently from the U.S. market.

• Consumer Finance Industry Concentration. The consumer finance industry can be significantly affected by changing economic conditions, demand for consumer loans, refinancing activity, interest rate changes, and government regulation.

• Issuer-Specific Changes. The value of an individual security or particular type of security can be more volatile than, and can perform differently from, the market as a whole. The value of securities of smaller issuers can be more volatile than that of larger issuers.

In addition, the fund is considered non-diversified and can invest a greater portion of assets in securities of a smaller number of individual issuers than a diversified fund. As a result, changes in the market value of a single investment could cause greater fluctuations in share price than would occur in a more diversified fund.

An investment in the fund is not a deposit of a bank and is not insured or guaranteed by the Federal Deposit Insurance Corporation or any other government agency. You could lose money by investing in the fund.

Performance

The following information is intended to help you understand the risks of investing in the fund. The information illustrates the changes in the performance of the fund's shares from year to year and compares the performance of the fund's shares to the performance of a securities market index and an additional index over various periods of time. The indexes have characteristics relevant to the fund's investment strategies. Index descriptions appear in the Additional Index Information section of the prospectus. Prior to December 1, 2010, the fund was named Home Finance Portfolio, and the fund operated under certain different investment policies and compared its performance to a different additional index. The fund's historical performance may not represent its current investment policies. Past performance (before and after taxes) is not an indication of future performance.

Visit www.fidelity.com for more recent performance information.

Year-by-Year Returns

Calendar Years

During the periods shown in the chart:	Returns	Quarter ended
Highest Quarter Return	21.38%	March 31, 2012
Lowest Quarter Return	-25.20%	December 31, 2007
Year-to-Date Return	2.17%	March 31, 2017

Average Annual Returns

After-tax returns are calculated using the historical highest individual federal marginal income tax rates, but do not reflect the impact of state or local taxes. Actual after-tax returns may differ depending on your individual circumstances. The after-tax returns shown are not relevant if you hold your shares in a retirement account or in another tax-deferred arrangement, such as an employee benefit plan (profit sharing, 401(k), or 403(b) plan). Return After Taxes on Distributions and Sale of Fund Shares may be higher than other returns for the same period due to a tax benefit of realizing a capital loss upon the sale of fund shares.

For the periods ended December 31, 2016

Average Annual Total Returns{- Consumer Finance Portfolio} - 02.28 Select Portfolios: Group 4 Financials Sector Combo PRO-06 - Consumer Finance Portfolio	Past 1 year	Past 5 years	Past 10 years
Consumer Finance Portfolio-Default | Return Before Taxes	14.59%	15.76%	(5.45%)
Consumer Finance Portfolio-Default | After Taxes on Distributions	13.28%	12.60%	(7.10%)
Consumer Finance Portfolio-Default | After Taxes on Distributions and Sales	8.84%	12.07%	(4.06%)
S&P 500® Index(reflects no deduction for fees, expenses, or taxes)	11.96%	14.66%	6.95%
S&P® Consumer Finance Index(reflects no deduction for fees, expenses, or taxes)	17.83%	14.45%	1.93%

XML

Label

Element

Value

Risk/Return:

rr_RiskReturnAbstract

Registrant Name

dei_EntityRegistrantName

FIDELITY SELECT PORTFOLIOS

Prospectus Date

rr_ProspectusDate

Apr. 29, 2017

02.28 Select Portfolios: Group 4 Financials Sector Combo PRO-06 | Consumer Finance Portfolio

Risk/Return:

rr_RiskReturnAbstract

Risk/Return [Heading]

rr_RiskReturnHeading

Fund Summary

Fund:
Consumer Finance Portfolio

Objective [Heading]

rr_ObjectiveHeading

Investment Objective

Objective, Primary [Text Block]

rr_ObjectivePrimaryTextBlock

The fund seeks capital appreciation.

Expense [Heading]

rr_ExpenseHeading

Fee Table

Expense Narrative [Text Block]

rr_ExpenseNarrativeTextBlock

The following table describes the fees and expenses that may be incurred when you buy and hold shares of the fund.

Shareholder Fees Caption [Text]

rr_ShareholderFeesCaption

Shareholder fees

(fees paid directly from your investment)

Operating Expenses Caption [Text]

rr_OperatingExpensesCaption

Annual Operating Expenses

(expenses that you pay each year as a % of the value of your investment)

Portfolio Turnover [Heading]

rr_PortfolioTurnoverHeading

Portfolio Turnover

Portfolio Turnover [Text Block]

rr_PortfolioTurnoverTextBlock

The fund pays transaction costs, such as commissions, when it buys and sells securities (or "turns over" its portfolio). A higher portfolio turnover rate may indicate higher transaction costs and may result in higher taxes when fund shares are held in a taxable account. These costs, which are not reflected in annual operating expenses or in the example, affect the fund's performance. During the most recent fiscal year, the fund's portfolio turnover rate was 44% of the average value of its portfolio.

Portfolio Turnover, Rate

rr_PortfolioTurnoverRate

44.00%

Expense Example Narrative [Text Block]

rr_ExpenseExampleNarrativeTextBlock

This example helps compare the cost of investing in the fund with the cost of investing in other funds.

Let's say, hypothetically, that the annual return for shares of the fund is 5% and that your shareholder fees and the annual operating expenses for shares of the fund are exactly as described in the fee table. This example illustrates the effect of fees and expenses, but is not meant to suggest actual or expected fees and expenses or returns, all of which may vary. For every $10,000 you invested, here's how much you would pay in total expenses if you sell all of your shares at the end of each time period indicated:

Expense Example by, Year, Caption [Text]

rr_ExpenseExampleByYearCaption

Sell All Shares

Strategy [Heading]

rr_StrategyHeading

Principal Investment Strategies

Strategy Narrative [Text Block]

rr_StrategyNarrativeTextBlock

• Normally investing primarily in common stocks.

• Normally investing at least 80% of assets in securities of companies principally engaged in providing products and services associated with consumer finance.

• Investing in domestic and foreign issuers.

• Using fundamental analysis of factors such as each issuer's financial condition and industry position, as well as market and economic conditions, to select investments.

Strategy Portfolio Concentration [Text]

rr_StrategyPortfolioConcentration

Normally investing at least 80% of assets in securities of companies principally engaged in providing products and services associated with consumer finance.

Risk [Heading]

rr_RiskHeading

Principal Investment Risks

Risk Narrative [Text Block]

rr_RiskNarrativeTextBlock

• Stock Market Volatility. Stock markets are volatile and can decline significantly in response to adverse issuer, political, regulatory, market, or economic developments. Different parts of the market, including different market sectors, and different types of securities can react differently to these developments.

• Foreign Exposure. Foreign markets can be more volatile than the U.S. market due to increased risks of adverse issuer, political, regulatory, market, or economic developments and can perform differently from the U.S. market.

• Consumer Finance Industry Concentration. The consumer finance industry can be significantly affected by changing economic conditions, demand for consumer loans, refinancing activity, interest rate changes, and government regulation.

• Issuer-Specific Changes. The value of an individual security or particular type of security can be more volatile than, and can perform differently from, the market as a whole. The value of securities of smaller issuers can be more volatile than that of larger issuers.

In addition, the fund is considered non-diversified and can invest a greater portion of assets in securities of a smaller number of individual issuers than a diversified fund. As a result, changes in the market value of a single investment could cause greater fluctuations in share price than would occur in a more diversified fund.

An investment in the fund is not a deposit of a bank and is not insured or guaranteed by the Federal Deposit Insurance Corporation or any other government agency. You could lose money by investing in the fund.

Risk Lose Money [Text]

rr_RiskLoseMoney

You could lose money by investing in the fund.

Risk Nondiversified Status [Text]

rr_RiskNondiversifiedStatus

In addition, the fund is considered non-diversified and can invest a greater portion of assets in securities of a smaller number of individual issuers than a diversified fund. As a result, changes in the market value of a single investment could cause greater fluctuations in share price than would occur in a more diversified fund.

Risk Not Insured Depository Institution [Text]

rr_RiskNotInsuredDepositoryInstitution

An investment in the fund is not a deposit of a bank and is not insured or guaranteed by the Federal Deposit Insurance Corporation or any other government agency.

Bar Chart and Performance Table [Heading]

rr_BarChartAndPerformanceTableHeading

Performance

Performance Narrative [Text Block]

rr_PerformanceNarrativeTextBlock

The following information is intended to help you understand the risks of investing in the fund. The information illustrates the changes in the performance of the fund's shares from year to year and compares the performance of the fund's shares to the performance of a securities market index and an additional index over various periods of time. The indexes have characteristics relevant to the fund's investment strategies. Index descriptions appear in the Additional Index Information section of the prospectus. Prior to December 1, 2010, the fund was named Home Finance Portfolio, and the fund operated under certain different investment policies and compared its performance to a different additional index. The fund's historical performance may not represent its current investment policies. Past performance (before and after taxes) is not an indication of future performance.

Visit www.fidelity.com for more recent performance information.

Performance Information Illustrates Variability of Returns [Text]

rr_PerformanceInformationIllustratesVariabilityOfReturns

The information illustrates the changes in the performance of the fund's shares from year to year and compares the performance of the fund's shares to the performance of a securities market index and an additional index over various periods of time.

Performance Availability Website Address [Text]

rr_PerformanceAvailabilityWebSiteAddress

www.fidelity.com

Performance Past Does Not Indicate Future [Text]

rr_PerformancePastDoesNotIndicateFuture

Past performance (before and after taxes) is not an indication of future performance.

Bar Chart [Heading]

rr_BarChartHeading

Year-by-Year Returns

Calendar Years

Bar Chart Closing [Text Block]

rr_BarChartClosingTextBlock

During the periods shown in the chart:	Returns	Quarter ended
Highest Quarter Return	21.38%	March 31, 2012
Lowest Quarter Return	-25.20%	December 31, 2007
Year-to-Date Return	2.17%	March 31, 2017

Performance Table Heading

rr_PerformanceTableHeading

Average Annual Returns

Performance Table Uses Highest Federal Rate

rr_PerformanceTableUsesHighestFederalRate

After-tax returns are calculated using the historical highest individual federal marginal income tax rates, but do not reflect the impact of state or local taxes.

Performance Table Not Relevant to Tax Deferred

rr_PerformanceTableNotRelevantToTaxDeferred

The after-tax returns shown are not relevant if you hold your shares in a retirement account or in another tax-deferred arrangement, such as an employee benefit plan (profit sharing, 401(k), or 403(b) plan).

Performance Table Explanation after Tax Higher

rr_PerformanceTableExplanationAfterTaxHigher

Return After Taxes on Distributions and Sale of Fund Shares may be higher than other returns for the same period due to a tax benefit of realizing a capital loss upon the sale of fund shares.

Performance Table Narrative

rr_PerformanceTableNarrativeTextBlock

After-tax returns are calculated using the historical highest individual federal marginal income tax rates, but do not reflect the impact of state or local taxes. Actual after-tax returns may differ depending on your individual circumstances. The after-tax returns shown are not relevant if you hold your shares in a retirement account or in another tax-deferred arrangement, such as an employee benefit plan (profit sharing, 401(k), or 403(b) plan). Return After Taxes on Distributions and Sale of Fund Shares may be higher than other returns for the same period due to a tax benefit of realizing a capital loss upon the sale of fund shares.

For the periods ended December 31, 2016

02.28 Select Portfolios: Group 4 Financials Sector Combo PRO-06 | Consumer Finance Portfolio | Consumer Finance Portfolio-Default

Risk/Return:

rr_RiskReturnAbstract

Redemption fee on shares held less than 30 days (as a % of amount redeemed)

rr_RedemptionFeeOverRedemption

0.75%

Management fee

rr_ManagementFeesOverAssets

0.55%

Distribution and/or Service (12b-1) fees

rr_DistributionAndService12b1FeesOverAssets

none

Other expenses

rr_OtherExpensesOverAssets

0.39%

Total annual operating expenses

rr_ExpensesOverAssets

0.94%

1 year

rr_ExpenseExampleYear01

$ 96

3 years

rr_ExpenseExampleYear03

300

5 years

rr_ExpenseExampleYear05

520

10 years

rr_ExpenseExampleYear10

$ 1,155

2007

rr_AnnualReturn2007

(37.96%)

2008

rr_AnnualReturn2008

(58.55%)

2009

rr_AnnualReturn2009

1.86%

2010

rr_AnnualReturn2010

5.93%

2011

rr_AnnualReturn2011

(0.99%)

2012

rr_AnnualReturn2012

34.46%

2013

rr_AnnualReturn2013

32.57%

2014

rr_AnnualReturn2014

7.06%

2015

rr_AnnualReturn2015

(4.96%)

2016

rr_AnnualReturn2016

14.59%

Year to Date Return, Label

rr_YearToDateReturnLabel

Year-to-Date Return

Bar Chart, Year to Date Return, Date

rr_BarChartYearToDateReturnDate

Mar. 31, 2017

Bar Chart, Year to Date Return

rr_BarChartYearToDateReturn

2.17%

Highest Quarterly Return, Label

rr_HighestQuarterlyReturnLabel

Highest Quarter Return

Highest Quarterly Return, Date

rr_BarChartHighestQuarterlyReturnDate

Mar. 31, 2012

Highest Quarterly Return

rr_BarChartHighestQuarterlyReturn

21.38%

Lowest Quarterly Return, Label

rr_LowestQuarterlyReturnLabel

Lowest Quarter Return

Lowest Quarterly Return, Date

rr_BarChartLowestQuarterlyReturnDate

Dec. 31, 2007

Lowest Quarterly Return

rr_BarChartLowestQuarterlyReturn

(25.20%)

02.28 Select Portfolios: Group 4 Financials Sector Combo PRO-06 | Consumer Finance Portfolio | Return Before Taxes | Consumer Finance Portfolio-Default

Risk/Return:

rr_RiskReturnAbstract

Column

rr_AverageAnnualReturnColumnName

Consumer Finance Portfolio

Label

rr_AverageAnnualReturnLabel

Return Before Taxes

Past 1 year

rr_AverageAnnualReturnYear01

14.59%

Past 5 years

rr_AverageAnnualReturnYear05

15.76%

Past 10 years

rr_AverageAnnualReturnYear10

(5.45%)

02.28 Select Portfolios: Group 4 Financials Sector Combo PRO-06 | Consumer Finance Portfolio | After Taxes on Distributions | Consumer Finance Portfolio-Default

Risk/Return:

rr_RiskReturnAbstract

Column

rr_AverageAnnualReturnColumnName

Consumer Finance Portfolio

Label

rr_AverageAnnualReturnLabel

Return After Taxes on Distributions

Past 1 year

rr_AverageAnnualReturnYear01

13.28%

Past 5 years

rr_AverageAnnualReturnYear05

12.60%

Past 10 years

rr_AverageAnnualReturnYear10

(7.10%)

02.28 Select Portfolios: Group 4 Financials Sector Combo PRO-06 | Consumer Finance Portfolio | After Taxes on Distributions and Sales | Consumer Finance Portfolio-Default

Risk/Return:

rr_RiskReturnAbstract

Column

rr_AverageAnnualReturnColumnName

Consumer Finance Portfolio

Label

rr_AverageAnnualReturnLabel

Return After Taxes on Distributions and Sale of Fund Shares

Past 1 year

rr_AverageAnnualReturnYear01

8.84%

Past 5 years

rr_AverageAnnualReturnYear05

12.07%

Past 10 years

rr_AverageAnnualReturnYear10

(4.06%)

02.28 Select Portfolios: Group 4 Financials Sector Combo PRO-06 | Consumer Finance Portfolio | S&P 500® Index(reflects no deduction for fees, expenses, or taxes)

Risk/Return:

rr_RiskReturnAbstract

Past 1 year

rr_AverageAnnualReturnYear01

11.96%

Past 5 years

rr_AverageAnnualReturnYear05

14.66%

Past 10 years

rr_AverageAnnualReturnYear10

6.95%

02.28 Select Portfolios: Group 4 Financials Sector Combo PRO-06 | Consumer Finance Portfolio | S&P® Consumer Finance Index(reflects no deduction for fees, expenses, or taxes)

Risk/Return:

rr_RiskReturnAbstract

Past 1 year

rr_AverageAnnualReturnYear01

17.83%

Past 5 years

rr_AverageAnnualReturnYear05

14.45%

Past 10 years

rr_AverageAnnualReturnYear10

1.93%

XML

02.28 Select Portfolios: Group 4 Financials Sector Combo PRO-06 | Financial Services Portfolio

Fund Summary

Fund:
Financial Services Portfolio

Investment Objective

The fund seeks capital appreciation.

Fee Table

The following table describes the fees and expenses that may be incurred when you buy and hold shares of the fund.

Shareholder fees

Shareholder Fees {- Financial Services Portfolio}	02.28 Select Portfolios: Group 4 Financials Sector Combo PRO-06 Financial Services Portfolio USD ($)
(fees paid directly from your investment)	none

Annual Operating Expenses

(expenses that you pay each year as a % of the value of your investment)

Annual Operating Expenses {- Financial Services Portfolio}	02.28 Select Portfolios: Group 4 Financials Sector Combo PRO-06 Financial Services Portfolio Financial Services Portfolio-Default
Management fee	0.55%
Distribution and/or Service (12b-1) fees	none
Other expenses	0.22%
Total annual operating expenses	0.77%

This example helps compare the cost of investing in the fund with the cost of investing in other funds.

Let's say, hypothetically, that the annual return for shares of the fund is 5% and that your shareholder fees and the annual operating expenses for shares of the fund are exactly as described in the fee table. This example illustrates the effect of fees and expenses, but is not meant to suggest actual or expected fees and expenses or returns, all of which may vary. For every $10,000 you invested, here's how much you would pay in total expenses if you sell all of your shares at the end of each time period indicated:

Sell All Shares

Expense Example {- Financial Services Portfolio}	02.28 Select Portfolios: Group 4 Financials Sector Combo PRO-06 Financial Services Portfolio Financial Services Portfolio-Default USD ($)
1 year	$ 79
3 years	246
5 years	428
10 years	$ 954

Portfolio Turnover

The fund pays transaction costs, such as commissions, when it buys and sells securities (or "turns over" its portfolio). A higher portfolio turnover rate may indicate higher transaction costs and may result in higher taxes when fund shares are held in a taxable account. These costs, which are not reflected in annual operating expenses or in the example, affect the fund's performance. During the most recent fiscal year, the fund's portfolio turnover rate was 84% of the average value of its portfolio.

Principal Investment Strategies

• Normally investing primarily in common stocks.

• Normally investing at least 80% of assets in securities of companies principally engaged in providing financial services to consumers and industry.

• Investing in domestic and foreign issuers.

• Using fundamental analysis of factors such as each issuer's financial condition and industry position, as well as market and economic conditions, to select investments.

Principal Investment Risks

• Stock Market Volatility. Stock markets are volatile and can decline significantly in response to adverse issuer, political, regulatory, market, or economic developments. Different parts of the market, including different market sectors, and different types of securities can react differently to these developments.

• Foreign Exposure. Foreign markets can be more volatile than the U.S. market due to increased risks of adverse issuer, political, regulatory, market, or economic developments and can perform differently from the U.S. market.

• Financials Industry Concentration. The financials industries are subject to extensive government regulation, can be subject to relatively rapid change due to increasingly blurred distinctions between service segments, and can be significantly affected by availability and cost of capital funds, changes in interest rates, the rate of corporate and consumer debt defaults, and price competition.

• Issuer-Specific Changes. The value of an individual security or particular type of security can be more volatile than, and can perform differently from, the market as a whole. The value of securities of smaller issuers can be more volatile than that of larger issuers.

An investment in the fund is not a deposit of a bank and is not insured or guaranteed by the Federal Deposit Insurance Corporation or any other government agency. You could lose money by investing in the fund.

Performance

The following information is intended to help you understand the risks of investing in the fund. The information illustrates the changes in the performance of the fund's shares from year to year and compares the performance of the fund's shares to the performance of a securities market index and an additional index over various periods of time. The indexes have characteristics relevant to the fund's investment strategies. Index descriptions appear in the Additional Index Information section of the prospectus. Past performance (before and after taxes) is not an indication of future performance.

Visit www.fidelity.com for more recent performance information.

Year-by-Year Returns

Calendar Years

During the periods shown in the chart:	Returns	Quarter ended
Highest Quarter Return	37.51%	June 30, 2009
Lowest Quarter Return	-27.62%	December 31, 2008
Year-to-Date Return	1.64%	March 31, 2017

Average Annual Returns

After-tax returns are calculated using the historical highest individual federal marginal income tax rates, but do not reflect the impact of state or local taxes. Actual after-tax returns may differ depending on your individual circumstances. The after-tax returns shown are not relevant if you hold your shares in a retirement account or in another tax-deferred arrangement, such as an employee benefit plan (profit sharing, 401(k), or 403(b) plan). Return After Taxes on Distributions and Sale of Fund Shares may be higher than other returns for the same period due to a tax benefit of realizing a capital loss upon the sale of fund shares.

For the periods ended December 31, 2016

Average Annual Total Returns{- Financial Services Portfolio} - 02.28 Select Portfolios: Group 4 Financials Sector Combo PRO-06 - Financial Services Portfolio	Past 1 year	Past 5 years	Past 10 years
Financial Services Portfolio-Default | Return Before Taxes	18.67%	16.62%	(0.03%)
Financial Services Portfolio-Default | After Taxes on Distributions	18.39%	16.25%	(0.37%)
Financial Services Portfolio-Default | After Taxes on Distributions and Sales	10.80%	13.42%	(0.02%)
S&P 500® Index(reflects no deduction for fees, expenses, or taxes)	11.96%	14.66%	6.95%
MSCI US IMI Financials 5% Capped Linked Index(reflects no deduction for fees, expenses, or taxes)	24.74%	18.98%	1.23%

XML

Label

Element

Value

Risk/Return:

rr_RiskReturnAbstract

Registrant Name

dei_EntityRegistrantName

FIDELITY SELECT PORTFOLIOS

Prospectus Date

rr_ProspectusDate

Apr. 29, 2017

02.28 Select Portfolios: Group 4 Financials Sector Combo PRO-06 | Financial Services Portfolio

Risk/Return:

rr_RiskReturnAbstract

Risk/Return [Heading]

rr_RiskReturnHeading

Fund Summary

Fund:
Financial Services Portfolio

Objective [Heading]

rr_ObjectiveHeading

Investment Objective

Objective, Primary [Text Block]

rr_ObjectivePrimaryTextBlock

The fund seeks capital appreciation.

Expense [Heading]

rr_ExpenseHeading

Fee Table

Expense Narrative [Text Block]

rr_ExpenseNarrativeTextBlock

The following table describes the fees and expenses that may be incurred when you buy and hold shares of the fund.

Shareholder Fees Caption [Text]

rr_ShareholderFeesCaption

Shareholder fees

(fees paid directly from your investment)

rr_ShareholderFeeOther

none

Operating Expenses Caption [Text]

rr_OperatingExpensesCaption

Annual Operating Expenses

(expenses that you pay each year as a % of the value of your investment)

Portfolio Turnover [Heading]

rr_PortfolioTurnoverHeading

Portfolio Turnover

Portfolio Turnover [Text Block]

rr_PortfolioTurnoverTextBlock

The fund pays transaction costs, such as commissions, when it buys and sells securities (or "turns over" its portfolio). A higher portfolio turnover rate may indicate higher transaction costs and may result in higher taxes when fund shares are held in a taxable account. These costs, which are not reflected in annual operating expenses or in the example, affect the fund's performance. During the most recent fiscal year, the fund's portfolio turnover rate was 84% of the average value of its portfolio.

Portfolio Turnover, Rate

rr_PortfolioTurnoverRate

84.00%

Expense Example Narrative [Text Block]

rr_ExpenseExampleNarrativeTextBlock

This example helps compare the cost of investing in the fund with the cost of investing in other funds.

Let's say, hypothetically, that the annual return for shares of the fund is 5% and that your shareholder fees and the annual operating expenses for shares of the fund are exactly as described in the fee table. This example illustrates the effect of fees and expenses, but is not meant to suggest actual or expected fees and expenses or returns, all of which may vary. For every $10,000 you invested, here's how much you would pay in total expenses if you sell all of your shares at the end of each time period indicated:

Expense Example by, Year, Caption [Text]

rr_ExpenseExampleByYearCaption

Sell All Shares

Strategy [Heading]

rr_StrategyHeading

Principal Investment Strategies

Strategy Narrative [Text Block]

rr_StrategyNarrativeTextBlock

• Normally investing primarily in common stocks.

• Normally investing at least 80% of assets in securities of companies principally engaged in providing financial services to consumers and industry.

• Investing in domestic and foreign issuers.

• Using fundamental analysis of factors such as each issuer's financial condition and industry position, as well as market and economic conditions, to select investments.

Strategy Portfolio Concentration [Text]

rr_StrategyPortfolioConcentration

Normally investing at least 80% of assets in securities of companies principally engaged in providing financial services to consumers and industry.

Risk [Heading]

rr_RiskHeading

Principal Investment Risks

Risk Narrative [Text Block]

rr_RiskNarrativeTextBlock

• Stock Market Volatility. Stock markets are volatile and can decline significantly in response to adverse issuer, political, regulatory, market, or economic developments. Different parts of the market, including different market sectors, and different types of securities can react differently to these developments.

• Foreign Exposure. Foreign markets can be more volatile than the U.S. market due to increased risks of adverse issuer, political, regulatory, market, or economic developments and can perform differently from the U.S. market.

• Financials Industry Concentration. The financials industries are subject to extensive government regulation, can be subject to relatively rapid change due to increasingly blurred distinctions between service segments, and can be significantly affected by availability and cost of capital funds, changes in interest rates, the rate of corporate and consumer debt defaults, and price competition.

• Issuer-Specific Changes. The value of an individual security or particular type of security can be more volatile than, and can perform differently from, the market as a whole. The value of securities of smaller issuers can be more volatile than that of larger issuers.

An investment in the fund is not a deposit of a bank and is not insured or guaranteed by the Federal Deposit Insurance Corporation or any other government agency. You could lose money by investing in the fund.

Risk Lose Money [Text]

rr_RiskLoseMoney

You could lose money by investing in the fund.

Risk Not Insured Depository Institution [Text]

rr_RiskNotInsuredDepositoryInstitution

An investment in the fund is not a deposit of a bank and is not insured or guaranteed by the Federal Deposit Insurance Corporation or any other government agency.

Bar Chart and Performance Table [Heading]

rr_BarChartAndPerformanceTableHeading

Performance

Performance Narrative [Text Block]

rr_PerformanceNarrativeTextBlock

The following information is intended to help you understand the risks of investing in the fund. The information illustrates the changes in the performance of the fund's shares from year to year and compares the performance of the fund's shares to the performance of a securities market index and an additional index over various periods of time. The indexes have characteristics relevant to the fund's investment strategies. Index descriptions appear in the Additional Index Information section of the prospectus. Past performance (before and after taxes) is not an indication of future performance.

Visit www.fidelity.com for more recent performance information.

Performance Information Illustrates Variability of Returns [Text]

rr_PerformanceInformationIllustratesVariabilityOfReturns

The information illustrates the changes in the performance of the fund's shares from year to year and compares the performance of the fund's shares to the performance of a securities market index and an additional index over various periods of time.

Performance Availability Website Address [Text]

rr_PerformanceAvailabilityWebSiteAddress

www.fidelity.com

Performance Past Does Not Indicate Future [Text]

rr_PerformancePastDoesNotIndicateFuture

Past performance (before and after taxes) is not an indication of future performance.

Bar Chart [Heading]

rr_BarChartHeading

Year-by-Year Returns

Calendar Years

Bar Chart Closing [Text Block]

rr_BarChartClosingTextBlock

During the periods shown in the chart:	Returns	Quarter ended
Highest Quarter Return	37.51%	June 30, 2009
Lowest Quarter Return	-27.62%	December 31, 2008
Year-to-Date Return	1.64%	March 31, 2017

Performance Table Heading

rr_PerformanceTableHeading

Average Annual Returns

Performance Table Uses Highest Federal Rate

rr_PerformanceTableUsesHighestFederalRate

After-tax returns are calculated using the historical highest individual federal marginal income tax rates, but do not reflect the impact of state or local taxes.

Performance Table Not Relevant to Tax Deferred

rr_PerformanceTableNotRelevantToTaxDeferred

The after-tax returns shown are not relevant if you hold your shares in a retirement account or in another tax-deferred arrangement, such as an employee benefit plan (profit sharing, 401(k), or 403(b) plan).

Performance Table Explanation after Tax Higher

rr_PerformanceTableExplanationAfterTaxHigher

Return After Taxes on Distributions and Sale of Fund Shares may be higher than other returns for the same period due to a tax benefit of realizing a capital loss upon the sale of fund shares.

Performance Table Narrative

rr_PerformanceTableNarrativeTextBlock

After-tax returns are calculated using the historical highest individual federal marginal income tax rates, but do not reflect the impact of state or local taxes. Actual after-tax returns may differ depending on your individual circumstances. The after-tax returns shown are not relevant if you hold your shares in a retirement account or in another tax-deferred arrangement, such as an employee benefit plan (profit sharing, 401(k), or 403(b) plan). Return After Taxes on Distributions and Sale of Fund Shares may be higher than other returns for the same period due to a tax benefit of realizing a capital loss upon the sale of fund shares.

For the periods ended December 31, 2016

02.28 Select Portfolios: Group 4 Financials Sector Combo PRO-06 | Financial Services Portfolio | Financial Services Portfolio-Default

Risk/Return:

rr_RiskReturnAbstract

Management fee

rr_ManagementFeesOverAssets

0.55%

Distribution and/or Service (12b-1) fees

rr_DistributionAndService12b1FeesOverAssets

none

Other expenses

rr_OtherExpensesOverAssets

0.22%

Total annual operating expenses

rr_ExpensesOverAssets

0.77%

1 year

rr_ExpenseExampleYear01

$ 79

3 years

rr_ExpenseExampleYear03

246

5 years

rr_ExpenseExampleYear05

428

10 years

rr_ExpenseExampleYear10

$ 954

2007

rr_AnnualReturn2007

(13.59%)

2008

rr_AnnualReturn2008

(49.89%)

2009

rr_AnnualReturn2009

25.88%

2010

rr_AnnualReturn2010

6.48%

2011

rr_AnnualReturn2011

(20.35%)

2012

rr_AnnualReturn2012

27.81%

2013

rr_AnnualReturn2013

33.67%

2014

rr_AnnualReturn2014

10.73%

2015

rr_AnnualReturn2015

(3.91%)

2016

rr_AnnualReturn2016

18.67%

Year to Date Return, Label

rr_YearToDateReturnLabel

Year-to-Date Return

Bar Chart, Year to Date Return, Date

rr_BarChartYearToDateReturnDate

Mar. 31, 2017

Bar Chart, Year to Date Return

rr_BarChartYearToDateReturn

1.64%

Highest Quarterly Return, Label

rr_HighestQuarterlyReturnLabel

Highest Quarter Return

Highest Quarterly Return, Date

rr_BarChartHighestQuarterlyReturnDate

Jun. 30, 2009

Highest Quarterly Return

rr_BarChartHighestQuarterlyReturn

37.51%

Lowest Quarterly Return, Label

rr_LowestQuarterlyReturnLabel

Lowest Quarter Return

Lowest Quarterly Return, Date

rr_BarChartLowestQuarterlyReturnDate

Dec. 31, 2008

Lowest Quarterly Return

rr_BarChartLowestQuarterlyReturn

(27.62%)

02.28 Select Portfolios: Group 4 Financials Sector Combo PRO-06 | Financial Services Portfolio | Return Before Taxes | Financial Services Portfolio-Default

Risk/Return:

rr_RiskReturnAbstract

Column

rr_AverageAnnualReturnColumnName

Financial Services Portfolio

Label

rr_AverageAnnualReturnLabel

Return Before Taxes

Past 1 year

rr_AverageAnnualReturnYear01

18.67%

Past 5 years

rr_AverageAnnualReturnYear05

16.62%

Past 10 years

rr_AverageAnnualReturnYear10

(0.03%)

02.28 Select Portfolios: Group 4 Financials Sector Combo PRO-06 | Financial Services Portfolio | After Taxes on Distributions | Financial Services Portfolio-Default

Risk/Return:

rr_RiskReturnAbstract

Column

rr_AverageAnnualReturnColumnName

Financial Services Portfolio

Label

rr_AverageAnnualReturnLabel

Return After Taxes on Distributions

Past 1 year

rr_AverageAnnualReturnYear01

18.39%

Past 5 years

rr_AverageAnnualReturnYear05

16.25%

Past 10 years

rr_AverageAnnualReturnYear10

(0.37%)

02.28 Select Portfolios: Group 4 Financials Sector Combo PRO-06 | Financial Services Portfolio | After Taxes on Distributions and Sales | Financial Services Portfolio-Default

Risk/Return:

rr_RiskReturnAbstract

Column

rr_AverageAnnualReturnColumnName

Financial Services Portfolio

Label

rr_AverageAnnualReturnLabel

Return After Taxes on Distributions and Sale of Fund Shares

Past 1 year

rr_AverageAnnualReturnYear01

10.80%

Past 5 years

rr_AverageAnnualReturnYear05

13.42%

Past 10 years

rr_AverageAnnualReturnYear10

(0.02%)

02.28 Select Portfolios: Group 4 Financials Sector Combo PRO-06 | Financial Services Portfolio | S&P 500® Index(reflects no deduction for fees, expenses, or taxes)

Risk/Return:

rr_RiskReturnAbstract

Past 1 year

rr_AverageAnnualReturnYear01

11.96%

Past 5 years

rr_AverageAnnualReturnYear05

14.66%

Past 10 years

rr_AverageAnnualReturnYear10

6.95%

02.28 Select Portfolios: Group 4 Financials Sector Combo PRO-06 | Financial Services Portfolio | MSCI US IMI Financials 5% Capped Linked Index(reflects no deduction for fees, expenses, or taxes)

Risk/Return:

rr_RiskReturnAbstract

Past 1 year

rr_AverageAnnualReturnYear01

24.74%

Past 5 years

rr_AverageAnnualReturnYear05

18.98%

Past 10 years

rr_AverageAnnualReturnYear10

1.23%

XML

02.28 Select Portfolios: Group 4 Financials Sector Combo PRO-06 | Insurance Portfolio

Fund Summary

Fund:
Insurance Portfolio

Investment Objective

The fund seeks capital appreciation.

Fee Table

The following table describes the fees and expenses that may be incurred when you buy and hold shares of the fund.

Shareholder fees

(fees paid directly from your investment)

Shareholder Fees {- Insurance Portfolio}	02.28 Select Portfolios: Group 4 Financials Sector Combo PRO-06 Insurance Portfolio Insurance Portfolio-Default
Redemption fee on shares held less than 30 days (as a % of amount redeemed)	0.75%

Annual Operating Expenses

(expenses that you pay each year as a % of the value of your investment)

Annual Operating Expenses {- Insurance Portfolio}	02.28 Select Portfolios: Group 4 Financials Sector Combo PRO-06 Insurance Portfolio Insurance Portfolio-Default
Management fee	0.55%
Distribution and/or Service (12b-1) fees	none
Other expenses	0.25%
Total annual operating expenses	0.80%

This example helps compare the cost of investing in the fund with the cost of investing in other funds.

Let's say, hypothetically, that the annual return for shares of the fund is 5% and that your shareholder fees and the annual operating expenses for shares of the fund are exactly as described in the fee table. This example illustrates the effect of fees and expenses, but is not meant to suggest actual or expected fees and expenses or returns, all of which may vary. For every $10,000 you invested, here's how much you would pay in total expenses if you sell all of your shares at the end of each time period indicated:

Sell All Shares

Expense Example {- Insurance Portfolio}	02.28 Select Portfolios: Group 4 Financials Sector Combo PRO-06 Insurance Portfolio Insurance Portfolio-Default USD ($)
1 year	$ 82
3 years	255
5 years	444
10 years	$ 990

Portfolio Turnover

The fund pays transaction costs, such as commissions, when it buys and sells securities (or "turns over" its portfolio). A higher portfolio turnover rate may indicate higher transaction costs and may result in higher taxes when fund shares are held in a taxable account. These costs, which are not reflected in annual operating expenses or in the example, affect the fund's performance. During the most recent fiscal year, the fund's portfolio turnover rate was 16% of the average value of its portfolio.

Principal Investment Strategies

• Normally investing primarily in common stocks.

• Normally investing at least 80% of assets in securities of companies principally engaged in underwriting, reinsuring, selling, distributing, or placing of property and casualty, life, or health insurance.

• Investing in domestic and foreign issuers.

• Using fundamental analysis of factors such as each issuer's financial condition and industry position, as well as market and economic conditions, to select investments.

Principal Investment Risks

• Stock Market Volatility. Stock markets are volatile and can decline significantly in response to adverse issuer, political, regulatory, market, or economic developments. Different parts of the market, including different market sectors, and different types of securities can react differently to these developments.

• Foreign Exposure. Foreign markets can be more volatile than the U.S. market due to increased risks of adverse issuer, political, regulatory, market, or economic developments and can perform differently from the U.S. market.

• Insurance Industry Concentration. The insurance industry is subject to extensive government regulation and can be significantly affected by interest rates, general economic conditions, and price and marketing competition. Different segments of the industry can be significantly affected by natural disasters, mortality and morbidity rates, and environmental clean-up.

• Issuer-Specific Changes. The value of an individual security or particular type of security can be more volatile than, and can perform differently from, the market as a whole. The value of securities of smaller issuers can be more volatile than that of larger issuers.

In addition, the fund is considered non-diversified and can invest a greater portion of assets in securities of a smaller number of individual issuers than a diversified fund. As a result, changes in the market value of a single investment could cause greater fluctuations in share price than would occur in a more diversified fund.

An investment in the fund is not a deposit of a bank and is not insured or guaranteed by the Federal Deposit Insurance Corporation or any other government agency. You could lose money by investing in the fund.

Performance

The following information is intended to help you understand the risks of investing in the fund. The information illustrates the changes in the performance of the fund's shares from year to year and compares the performance of the fund's shares to the performance of a securities market index and an additional index over various periods of time. The indexes have characteristics relevant to the fund's investment strategies. Index descriptions appear in the Additional Index Information section of the prospectus. Past performance (before and after taxes) is not an indication of future performance.

Visit www.fidelity.com for more recent performance information.

Year-by-Year Returns

Calendar Years

During the periods shown in the chart:	Returns	Quarter ended
Highest Quarter Return	28.40%	September 30, 2009
Lowest Quarter Return	-17.71%	March 31, 2009
Year-to-Date Return	2.90%	March 31, 2017

Average Annual Returns

After-tax returns are calculated using the historical highest individual federal marginal income tax rates, but do not reflect the impact of state or local taxes. Actual after-tax returns may differ depending on your individual circumstances. The after-tax returns shown are not relevant if you hold your shares in a retirement account or in another tax-deferred arrangement, such as an employee benefit plan (profit sharing, 401(k), or 403(b) plan).

For the periods ended December 31, 2016

Average Annual Total Returns{- Insurance Portfolio} - 02.28 Select Portfolios: Group 4 Financials Sector Combo PRO-06 - Insurance Portfolio	Past 1 year	Past 5 years	Past 10 years
Insurance Portfolio-Default | Return Before Taxes	18.17%	18.25%	4.99%
Insurance Portfolio-Default | After Taxes on Distributions	17.32%	16.61%	4.08%
Insurance Portfolio-Default | After Taxes on Distributions and Sales	10.88%	14.42%	3.78%
S&P 500® Index(reflects no deduction for fees, expenses, or taxes)	11.96%	14.66%	6.95%
MSCI U.S. IMI Insurance 25-50 Index(reflects no deduction for fees, expenses, or taxes)	18.76%	18.37%	3.92%

XML

Label

Element

Value

Risk/Return:

rr_RiskReturnAbstract

Registrant Name

dei_EntityRegistrantName

FIDELITY SELECT PORTFOLIOS

Prospectus Date

rr_ProspectusDate

Apr. 29, 2017

02.28 Select Portfolios: Group 4 Financials Sector Combo PRO-06 | Insurance Portfolio

Risk/Return:

rr_RiskReturnAbstract

Risk/Return [Heading]

rr_RiskReturnHeading

Fund Summary

Fund:
Insurance Portfolio

Objective [Heading]

rr_ObjectiveHeading

Investment Objective

Objective, Primary [Text Block]

rr_ObjectivePrimaryTextBlock

The fund seeks capital appreciation.

Expense [Heading]

rr_ExpenseHeading

Fee Table

Expense Narrative [Text Block]

rr_ExpenseNarrativeTextBlock

The following table describes the fees and expenses that may be incurred when you buy and hold shares of the fund.

Shareholder Fees Caption [Text]

rr_ShareholderFeesCaption

Shareholder fees

(fees paid directly from your investment)

Operating Expenses Caption [Text]

rr_OperatingExpensesCaption

Annual Operating Expenses

(expenses that you pay each year as a % of the value of your investment)

Portfolio Turnover [Heading]

rr_PortfolioTurnoverHeading

Portfolio Turnover

Portfolio Turnover [Text Block]

rr_PortfolioTurnoverTextBlock

The fund pays transaction costs, such as commissions, when it buys and sells securities (or "turns over" its portfolio). A higher portfolio turnover rate may indicate higher transaction costs and may result in higher taxes when fund shares are held in a taxable account. These costs, which are not reflected in annual operating expenses or in the example, affect the fund's performance. During the most recent fiscal year, the fund's portfolio turnover rate was 16% of the average value of its portfolio.

Portfolio Turnover, Rate

rr_PortfolioTurnoverRate

16.00%

Expense Example Narrative [Text Block]

rr_ExpenseExampleNarrativeTextBlock

This example helps compare the cost of investing in the fund with the cost of investing in other funds.

Let's say, hypothetically, that the annual return for shares of the fund is 5% and that your shareholder fees and the annual operating expenses for shares of the fund are exactly as described in the fee table. This example illustrates the effect of fees and expenses, but is not meant to suggest actual or expected fees and expenses or returns, all of which may vary. For every $10,000 you invested, here's how much you would pay in total expenses if you sell all of your shares at the end of each time period indicated:

Expense Example by, Year, Caption [Text]

rr_ExpenseExampleByYearCaption

Sell All Shares

Strategy [Heading]

rr_StrategyHeading

Principal Investment Strategies

Strategy Narrative [Text Block]

rr_StrategyNarrativeTextBlock

• Normally investing primarily in common stocks.

• Normally investing at least 80% of assets in securities of companies principally engaged in underwriting, reinsuring, selling, distributing, or placing of property and casualty, life, or health insurance.

• Investing in domestic and foreign issuers.

• Using fundamental analysis of factors such as each issuer's financial condition and industry position, as well as market and economic conditions, to select investments.

Strategy Portfolio Concentration [Text]

rr_StrategyPortfolioConcentration

Normally investing at least 80% of assets in securities of companies principally engaged in underwriting, reinsuring, selling, distributing, or placing of property and casualty, life, or health insurance.

Risk [Heading]

rr_RiskHeading

Principal Investment Risks

Risk Narrative [Text Block]

rr_RiskNarrativeTextBlock

• Stock Market Volatility. Stock markets are volatile and can decline significantly in response to adverse issuer, political, regulatory, market, or economic developments. Different parts of the market, including different market sectors, and different types of securities can react differently to these developments.

• Foreign Exposure. Foreign markets can be more volatile than the U.S. market due to increased risks of adverse issuer, political, regulatory, market, or economic developments and can perform differently from the U.S. market.

• Insurance Industry Concentration. The insurance industry is subject to extensive government regulation and can be significantly affected by interest rates, general economic conditions, and price and marketing competition. Different segments of the industry can be significantly affected by natural disasters, mortality and morbidity rates, and environmental clean-up.

• Issuer-Specific Changes. The value of an individual security or particular type of security can be more volatile than, and can perform differently from, the market as a whole. The value of securities of smaller issuers can be more volatile than that of larger issuers.

In addition, the fund is considered non-diversified and can invest a greater portion of assets in securities of a smaller number of individual issuers than a diversified fund. As a result, changes in the market value of a single investment could cause greater fluctuations in share price than would occur in a more diversified fund.

An investment in the fund is not a deposit of a bank and is not insured or guaranteed by the Federal Deposit Insurance Corporation or any other government agency. You could lose money by investing in the fund.

Risk Lose Money [Text]

rr_RiskLoseMoney

You could lose money by investing in the fund.

Risk Nondiversified Status [Text]

rr_RiskNondiversifiedStatus

In addition, the fund is considered non-diversified and can invest a greater portion of assets in securities of a smaller number of individual issuers than a diversified fund. As a result, changes in the market value of a single investment could cause greater fluctuations in share price than would occur in a more diversified fund.

Risk Not Insured Depository Institution [Text]

rr_RiskNotInsuredDepositoryInstitution

An investment in the fund is not a deposit of a bank and is not insured or guaranteed by the Federal Deposit Insurance Corporation or any other government agency.

Bar Chart and Performance Table [Heading]

rr_BarChartAndPerformanceTableHeading

Performance

Performance Narrative [Text Block]

rr_PerformanceNarrativeTextBlock

The following information is intended to help you understand the risks of investing in the fund. The information illustrates the changes in the performance of the fund's shares from year to year and compares the performance of the fund's shares to the performance of a securities market index and an additional index over various periods of time. The indexes have characteristics relevant to the fund's investment strategies. Index descriptions appear in the Additional Index Information section of the prospectus. Past performance (before and after taxes) is not an indication of future performance.

Visit www.fidelity.com for more recent performance information.

Performance Information Illustrates Variability of Returns [Text]

rr_PerformanceInformationIllustratesVariabilityOfReturns

The information illustrates the changes in the performance of the fund's shares from year to year and compares the performance of the fund's shares to the performance of a securities market index and an additional index over various periods of time.

Performance Availability Website Address [Text]

rr_PerformanceAvailabilityWebSiteAddress

www.fidelity.com

Performance Past Does Not Indicate Future [Text]

rr_PerformancePastDoesNotIndicateFuture

Past performance (before and after taxes) is not an indication of future performance.

Bar Chart [Heading]

rr_BarChartHeading

Year-by-Year Returns

Calendar Years

Bar Chart Closing [Text Block]

rr_BarChartClosingTextBlock

During the periods shown in the chart:	Returns	Quarter ended
Highest Quarter Return	28.40%	September 30, 2009
Lowest Quarter Return	-17.71%	March 31, 2009
Year-to-Date Return	2.90%	March 31, 2017

Performance Table Heading

rr_PerformanceTableHeading

Average Annual Returns

Performance Table Uses Highest Federal Rate

rr_PerformanceTableUsesHighestFederalRate

After-tax returns are calculated using the historical highest individual federal marginal income tax rates, but do not reflect the impact of state or local taxes.

Performance Table Not Relevant to Tax Deferred

rr_PerformanceTableNotRelevantToTaxDeferred

The after-tax returns shown are not relevant if you hold your shares in a retirement account or in another tax-deferred arrangement, such as an employee benefit plan (profit sharing, 401(k), or 403(b) plan).

Performance Table Narrative

rr_PerformanceTableNarrativeTextBlock

After-tax returns are calculated using the historical highest individual federal marginal income tax rates, but do not reflect the impact of state or local taxes. Actual after-tax returns may differ depending on your individual circumstances. The after-tax returns shown are not relevant if you hold your shares in a retirement account or in another tax-deferred arrangement, such as an employee benefit plan (profit sharing, 401(k), or 403(b) plan).

For the periods ended December 31, 2016

02.28 Select Portfolios: Group 4 Financials Sector Combo PRO-06 | Insurance Portfolio | Insurance Portfolio-Default

Risk/Return:

rr_RiskReturnAbstract

Redemption fee on shares held less than 30 days (as a % of amount redeemed)

rr_RedemptionFeeOverRedemption

0.75%

Management fee

rr_ManagementFeesOverAssets

0.55%

Distribution and/or Service (12b-1) fees

rr_DistributionAndService12b1FeesOverAssets

none

Other expenses

rr_OtherExpensesOverAssets

0.25%

Total annual operating expenses

rr_ExpensesOverAssets

0.80%

1 year

rr_ExpenseExampleYear01

$ 82

3 years

rr_ExpenseExampleYear03

255

5 years

rr_ExpenseExampleYear05

444

10 years

rr_ExpenseExampleYear10

$ 990

2007

rr_AnnualReturn2007

(4.35%)

2008

rr_AnnualReturn2008

(46.99%)

2009

rr_AnnualReturn2009

21.83%

2010

rr_AnnualReturn2010

20.13%

2011

rr_AnnualReturn2011

(5.16%)

2012

rr_AnnualReturn2012

19.67%

2013

rr_AnnualReturn2013

43.80%

2014

rr_AnnualReturn2014

9.90%

2015

rr_AnnualReturn2015

3.47%

2016

rr_AnnualReturn2016

18.17%

Year to Date Return, Label

rr_YearToDateReturnLabel

Year-to-Date Return

Bar Chart, Year to Date Return, Date

rr_BarChartYearToDateReturnDate

Mar. 31, 2017

Bar Chart, Year to Date Return

rr_BarChartYearToDateReturn

2.90%

Highest Quarterly Return, Label

rr_HighestQuarterlyReturnLabel

Highest Quarter Return

Highest Quarterly Return, Date

rr_BarChartHighestQuarterlyReturnDate

Sep. 30, 2009

Highest Quarterly Return

rr_BarChartHighestQuarterlyReturn

28.40%

Lowest Quarterly Return, Label

rr_LowestQuarterlyReturnLabel

Lowest Quarter Return

Lowest Quarterly Return, Date

rr_BarChartLowestQuarterlyReturnDate

Mar. 31, 2009

Lowest Quarterly Return

rr_BarChartLowestQuarterlyReturn

(17.71%)

02.28 Select Portfolios: Group 4 Financials Sector Combo PRO-06 | Insurance Portfolio | Return Before Taxes | Insurance Portfolio-Default

Risk/Return:

rr_RiskReturnAbstract

Column

rr_AverageAnnualReturnColumnName

Insurance Portfolio

Label

rr_AverageAnnualReturnLabel

Return Before Taxes

Past 1 year

rr_AverageAnnualReturnYear01

18.17%

Past 5 years

rr_AverageAnnualReturnYear05

18.25%

Past 10 years

rr_AverageAnnualReturnYear10

4.99%

02.28 Select Portfolios: Group 4 Financials Sector Combo PRO-06 | Insurance Portfolio | After Taxes on Distributions | Insurance Portfolio-Default

Risk/Return:

rr_RiskReturnAbstract

Column

rr_AverageAnnualReturnColumnName

Insurance Portfolio

Label

rr_AverageAnnualReturnLabel

Return After Taxes on Distributions

Past 1 year

rr_AverageAnnualReturnYear01

17.32%

Past 5 years

rr_AverageAnnualReturnYear05

16.61%

Past 10 years

rr_AverageAnnualReturnYear10

4.08%

02.28 Select Portfolios: Group 4 Financials Sector Combo PRO-06 | Insurance Portfolio | After Taxes on Distributions and Sales | Insurance Portfolio-Default

Risk/Return:

rr_RiskReturnAbstract

Column

rr_AverageAnnualReturnColumnName

Insurance Portfolio

Label

rr_AverageAnnualReturnLabel

Return After Taxes on Distributions and Sale of Fund Shares

Past 1 year

rr_AverageAnnualReturnYear01

10.88%

Past 5 years

rr_AverageAnnualReturnYear05

14.42%

Past 10 years

rr_AverageAnnualReturnYear10

3.78%

02.28 Select Portfolios: Group 4 Financials Sector Combo PRO-06 | Insurance Portfolio | S&P 500® Index(reflects no deduction for fees, expenses, or taxes)

Risk/Return:

rr_RiskReturnAbstract

Past 1 year

rr_AverageAnnualReturnYear01

11.96%

Past 5 years

rr_AverageAnnualReturnYear05

14.66%

Past 10 years

rr_AverageAnnualReturnYear10

6.95%

02.28 Select Portfolios: Group 4 Financials Sector Combo PRO-06 | Insurance Portfolio | MSCI U.S. IMI Insurance 25-50 Index(reflects no deduction for fees, expenses, or taxes)

Risk/Return:

rr_RiskReturnAbstract

Past 1 year

rr_AverageAnnualReturnYear01

18.76%

Past 5 years

rr_AverageAnnualReturnYear05

18.37%

Past 10 years

rr_AverageAnnualReturnYear10

3.92%

XML

02.28 Select Portfolios: Group 7 Information Technology Sector Combo PRO-05 | Communications Equipment Portfolio

Fund Summary

Fund:
Communications Equipment Portfolio

Investment Objective

The fund seeks capital appreciation.

Fee Table

The following table describes the fees and expenses that may be incurred when you buy and hold shares of the fund.

Shareholder fees

(fees paid directly from your investment)

Shareholder Fees {- Communications Equipment Portfolio}	02.28 Select Portfolios: Group 7 Information Technology Sector Combo PRO-05 Communications Equipment Portfolio Communications Equipment Portfolio-Default
Redemption fee on shares held less than 30 days (as a % of amount redeemed)	0.75%

Annual Operating Expenses

(expenses that you pay each year as a % of the value of your investment)

Annual Operating Expenses {- Communications Equipment Portfolio}	02.28 Select Portfolios: Group 7 Information Technology Sector Combo PRO-05 Communications Equipment Portfolio Communications Equipment Portfolio-Default
Management fee	0.55%
Distribution and/or Service (12b-1) fees	none
Other expenses	0.33%
Total annual operating expenses	0.88%

This example helps compare the cost of investing in the fund with the cost of investing in other funds.

Let's say, hypothetically, that the annual return for shares of the fund is 5% and that your shareholder fees and the annual operating expenses for shares of the fund are exactly as described in the fee table. This example illustrates the effect of fees and expenses, but is not meant to suggest actual or expected fees and expenses or returns, all of which may vary. For every $10,000 you invested, here's how much you would pay in total expenses if you sell all of your shares at the end of each time period indicated:

Sell All Shares

Expense Example {- Communications Equipment Portfolio}	02.28 Select Portfolios: Group 7 Information Technology Sector Combo PRO-05 Communications Equipment Portfolio Communications Equipment Portfolio-Default USD ($)
1 year	$ 90
3 years	281
5 years	488
10 years	$ 1,084

Portfolio Turnover

The fund pays transaction costs, such as commissions, when it buys and sells securities (or "turns over" its portfolio). A higher portfolio turnover rate may indicate higher transaction costs and may result in higher taxes when fund shares are held in a taxable account. These costs, which are not reflected in annual operating expenses or in the example, affect the fund's performance. During the most recent fiscal year, the fund's portfolio turnover rate was 38% of the average value of its portfolio.

Principal Investment Strategies

• Normally investing primarily in common stocks.

• Normally investing at least 80% of assets in securities of companies principally engaged in the development, manufacture, or sale of communications equipment.

• Investing in domestic and foreign issuers.

• Using fundamental analysis of factors such as each issuer's financial condition and industry position, as well as market and economic conditions, to select investments.

Principal Investment Risks

• Stock Market Volatility. Stock markets are volatile and can decline significantly in response to adverse issuer, political, regulatory, market, or economic developments. Different parts of the market, including different market sectors, and different types of securities can react differently to these developments.

• Foreign Exposure. Foreign markets can be more volatile than the U.S. market due to increased risks of adverse issuer, political, regulatory, market, or economic developments and can perform differently from the U.S. market.

• Communications Equipment Industry Concentration. The communications equipment industry can be significantly affected by failure to obtain, or delays in obtaining, financing or regulatory approval, intense competition, product compatibility, consumer preferences, corporate capital expenditures, and rapid obsolescence.

• Issuer-Specific Changes. The value of an individual security or particular type of security can be more volatile than, and can perform differently from, the market as a whole. The value of securities of smaller issuers can be more volatile than that of larger issuers.

In addition, the fund is considered non-diversified and can invest a greater portion of assets in securities of a smaller number of individual issuers than a diversified fund. As a result, changes in the market value of a single investment could cause greater fluctuations in share price than would occur in a more diversified fund.

An investment in the fund is not a deposit of a bank and is not insured or guaranteed by the Federal Deposit Insurance Corporation or any other government agency. You could lose money by investing in the fund.

Performance

The following information is intended to help you understand the risks of investing in the fund. The information illustrates the changes in the performance of the fund's shares from year to year and compares the performance of the fund's shares to the performance of a securities market index and an additional index over various periods of time. The indexes have characteristics relevant to the fund's investment strategies. Index descriptions appear in the Additional Index Information section of the prospectus. Past performance (before and after taxes) is not an indication of future performance.

Visit www.fidelity.com for more recent performance information.

Year-by-Year Returns

Calendar Years

During the periods shown in the chart:	Returns	Quarter ended
Highest Quarter Return	38.25%	June 30, 2009
Lowest Quarter Return	-30.43%	December 31, 2008
Year-to-Date Return	5.06%	March 31, 2017

Average Annual Returns

After-tax returns are calculated using the historical highest individual federal marginal income tax rates, but do not reflect the impact of state or local taxes. Actual after-tax returns may differ depending on your individual circumstances. The after-tax returns shown are not relevant if you hold your shares in a retirement account or in another tax-deferred arrangement, such as an employee benefit plan (profit sharing, 401(k), or 403(b) plan).

For the periods ended December 31, 2016

Average Annual Total Returns{- Communications Equipment Portfolio} - 02.28 Select Portfolios: Group 7 Information Technology Sector Combo PRO-05 - Communications Equipment Portfolio	Past 1 year	Past 5 years	Past 10 years
Communications Equipment Portfolio-Default | Return Before Taxes	19.88%	10.95%	6.22%
Communications Equipment Portfolio-Default | After Taxes on Distributions	19.55%	10.19%	5.84%
Communications Equipment Portfolio-Default | After Taxes on Distributions and Sales	11.50%	8.52%	4.91%
S&P 500® Index(reflects no deduction for fees, expenses, or taxes)	11.96%	14.66%	6.95%
S&P® Custom Communications Equipment Index(reflects no deduction for fees, expenses, or taxes)	11.08%	9.18%	2.82%

XML

Label

Element

Value

Risk/Return:

rr_RiskReturnAbstract

Registrant Name

dei_EntityRegistrantName

FIDELITY SELECT PORTFOLIOS

Prospectus Date

rr_ProspectusDate

Apr. 29, 2017

02.28 Select Portfolios: Group 7 Information Technology Sector Combo PRO-05 | Communications Equipment Portfolio

Risk/Return:

rr_RiskReturnAbstract

Risk/Return [Heading]

rr_RiskReturnHeading

Fund Summary

Fund:
Communications Equipment Portfolio

Objective [Heading]

rr_ObjectiveHeading

Investment Objective

Objective, Primary [Text Block]

rr_ObjectivePrimaryTextBlock

The fund seeks capital appreciation.

Expense [Heading]

rr_ExpenseHeading

Fee Table

Expense Narrative [Text Block]

rr_ExpenseNarrativeTextBlock

The following table describes the fees and expenses that may be incurred when you buy and hold shares of the fund.

Shareholder Fees Caption [Text]

rr_ShareholderFeesCaption

Shareholder fees

(fees paid directly from your investment)

Operating Expenses Caption [Text]

rr_OperatingExpensesCaption

Annual Operating Expenses

(expenses that you pay each year as a % of the value of your investment)

Portfolio Turnover [Heading]

rr_PortfolioTurnoverHeading

Portfolio Turnover

Portfolio Turnover [Text Block]

rr_PortfolioTurnoverTextBlock

The fund pays transaction costs, such as commissions, when it buys and sells securities (or "turns over" its portfolio). A higher portfolio turnover rate may indicate higher transaction costs and may result in higher taxes when fund shares are held in a taxable account. These costs, which are not reflected in annual operating expenses or in the example, affect the fund's performance. During the most recent fiscal year, the fund's portfolio turnover rate was 38% of the average value of its portfolio.

Portfolio Turnover, Rate

rr_PortfolioTurnoverRate

38.00%

Expense Example Narrative [Text Block]

rr_ExpenseExampleNarrativeTextBlock

This example helps compare the cost of investing in the fund with the cost of investing in other funds.

Let's say, hypothetically, that the annual return for shares of the fund is 5% and that your shareholder fees and the annual operating expenses for shares of the fund are exactly as described in the fee table. This example illustrates the effect of fees and expenses, but is not meant to suggest actual or expected fees and expenses or returns, all of which may vary. For every $10,000 you invested, here's how much you would pay in total expenses if you sell all of your shares at the end of each time period indicated:

Expense Example by, Year, Caption [Text]

rr_ExpenseExampleByYearCaption

Sell All Shares

Strategy [Heading]

rr_StrategyHeading

Principal Investment Strategies

Strategy Narrative [Text Block]

rr_StrategyNarrativeTextBlock

• Normally investing primarily in common stocks.

• Normally investing at least 80% of assets in securities of companies principally engaged in the development, manufacture, or sale of communications equipment.

• Investing in domestic and foreign issuers.

• Using fundamental analysis of factors such as each issuer's financial condition and industry position, as well as market and economic conditions, to select investments.

Strategy Portfolio Concentration [Text]

rr_StrategyPortfolioConcentration

Normally investing at least 80% of assets in securities of companies principally engaged in the development, manufacture, or sale of communications equipment.

Risk [Heading]

rr_RiskHeading

Principal Investment Risks

Risk Narrative [Text Block]

rr_RiskNarrativeTextBlock

• Stock Market Volatility. Stock markets are volatile and can decline significantly in response to adverse issuer, political, regulatory, market, or economic developments. Different parts of the market, including different market sectors, and different types of securities can react differently to these developments.

• Foreign Exposure. Foreign markets can be more volatile than the U.S. market due to increased risks of adverse issuer, political, regulatory, market, or economic developments and can perform differently from the U.S. market.

• Communications Equipment Industry Concentration. The communications equipment industry can be significantly affected by failure to obtain, or delays in obtaining, financing or regulatory approval, intense competition, product compatibility, consumer preferences, corporate capital expenditures, and rapid obsolescence.

• Issuer-Specific Changes. The value of an individual security or particular type of security can be more volatile than, and can perform differently from, the market as a whole. The value of securities of smaller issuers can be more volatile than that of larger issuers.

In addition, the fund is considered non-diversified and can invest a greater portion of assets in securities of a smaller number of individual issuers than a diversified fund. As a result, changes in the market value of a single investment could cause greater fluctuations in share price than would occur in a more diversified fund.

An investment in the fund is not a deposit of a bank and is not insured or guaranteed by the Federal Deposit Insurance Corporation or any other government agency. You could lose money by investing in the fund.

Risk Lose Money [Text]

rr_RiskLoseMoney

You could lose money by investing in the fund.

Risk Nondiversified Status [Text]

rr_RiskNondiversifiedStatus

In addition, the fund is considered non-diversified and can invest a greater portion of assets in securities of a smaller number of individual issuers than a diversified fund. As a result, changes in the market value of a single investment could cause greater fluctuations in share price than would occur in a more diversified fund.

Risk Not Insured Depository Institution [Text]

rr_RiskNotInsuredDepositoryInstitution

An investment in the fund is not a deposit of a bank and is not insured or guaranteed by the Federal Deposit Insurance Corporation or any other government agency.

Bar Chart and Performance Table [Heading]

rr_BarChartAndPerformanceTableHeading

Performance

Performance Narrative [Text Block]

rr_PerformanceNarrativeTextBlock

The following information is intended to help you understand the risks of investing in the fund. The information illustrates the changes in the performance of the fund's shares from year to year and compares the performance of the fund's shares to the performance of a securities market index and an additional index over various periods of time. The indexes have characteristics relevant to the fund's investment strategies. Index descriptions appear in the Additional Index Information section of the prospectus. Past performance (before and after taxes) is not an indication of future performance.

Visit www.fidelity.com for more recent performance information.

Performance Information Illustrates Variability of Returns [Text]

rr_PerformanceInformationIllustratesVariabilityOfReturns

The information illustrates the changes in the performance of the fund's shares from year to year and compares the performance of the fund's shares to the performance of a securities market index and an additional index over various periods of time.

Performance Availability Website Address [Text]

rr_PerformanceAvailabilityWebSiteAddress

www.fidelity.com

Performance Past Does Not Indicate Future [Text]

rr_PerformancePastDoesNotIndicateFuture

Past performance (before and after taxes) is not an indication of future performance.

Bar Chart [Heading]

rr_BarChartHeading

Year-by-Year Returns

Calendar Years

Bar Chart Closing [Text Block]

rr_BarChartClosingTextBlock

During the periods shown in the chart:	Returns	Quarter ended
Highest Quarter Return	38.25%	June 30, 2009
Lowest Quarter Return	-30.43%	December 31, 2008
Year-to-Date Return	5.06%	March 31, 2017

Performance Table Heading

rr_PerformanceTableHeading

Average Annual Returns

Performance Table Uses Highest Federal Rate

rr_PerformanceTableUsesHighestFederalRate

After-tax returns are calculated using the historical highest individual federal marginal income tax rates, but do not reflect the impact of state or local taxes.

Performance Table Not Relevant to Tax Deferred

rr_PerformanceTableNotRelevantToTaxDeferred

The after-tax returns shown are not relevant if you hold your shares in a retirement account or in another tax-deferred arrangement, such as an employee benefit plan (profit sharing, 401(k), or 403(b) plan).

Performance Table Narrative

rr_PerformanceTableNarrativeTextBlock

After-tax returns are calculated using the historical highest individual federal marginal income tax rates, but do not reflect the impact of state or local taxes. Actual after-tax returns may differ depending on your individual circumstances. The after-tax returns shown are not relevant if you hold your shares in a retirement account or in another tax-deferred arrangement, such as an employee benefit plan (profit sharing, 401(k), or 403(b) plan).

For the periods ended December 31, 2016

02.28 Select Portfolios: Group 7 Information Technology Sector Combo PRO-05 | Communications Equipment Portfolio | Communications Equipment Portfolio-Default

Risk/Return:

rr_RiskReturnAbstract

Redemption fee on shares held less than 30 days (as a % of amount redeemed)

rr_RedemptionFeeOverRedemption

0.75%

Management fee

rr_ManagementFeesOverAssets

0.55%

Distribution and/or Service (12b-1) fees

rr_DistributionAndService12b1FeesOverAssets

none

Other expenses

rr_OtherExpensesOverAssets

0.33%

Total annual operating expenses

rr_ExpensesOverAssets

0.88%

1 year

rr_ExpenseExampleYear01

$ 90

3 years

rr_ExpenseExampleYear03

281

5 years

rr_ExpenseExampleYear05

488

10 years

rr_ExpenseExampleYear10

$ 1,084

2007

rr_AnnualReturn2007

9.78%

2008

rr_AnnualReturn2008

(48.49%)

2009

rr_AnnualReturn2009

80.70%

2010

rr_AnnualReturn2010

27.70%

2011

rr_AnnualReturn2011

(16.68%)

2012

rr_AnnualReturn2012

5.97%

2013

rr_AnnualReturn2013

28.16%

2014

rr_AnnualReturn2014

14.97%

2015

rr_AnnualReturn2015

(10.18%)

2016

rr_AnnualReturn2016

19.88%

Year to Date Return, Label

rr_YearToDateReturnLabel

Year-to-Date Return

Bar Chart, Year to Date Return, Date

rr_BarChartYearToDateReturnDate

Mar. 31, 2017

Bar Chart, Year to Date Return

rr_BarChartYearToDateReturn

5.06%

Highest Quarterly Return, Label

rr_HighestQuarterlyReturnLabel

Highest Quarter Return

Highest Quarterly Return, Date

rr_BarChartHighestQuarterlyReturnDate

Jun. 30, 2009

Highest Quarterly Return

rr_BarChartHighestQuarterlyReturn

38.25%

Lowest Quarterly Return, Label

rr_LowestQuarterlyReturnLabel

Lowest Quarter Return

Lowest Quarterly Return, Date

rr_BarChartLowestQuarterlyReturnDate

Dec. 31, 2008

Lowest Quarterly Return

rr_BarChartLowestQuarterlyReturn

(30.43%)

02.28 Select Portfolios: Group 7 Information Technology Sector Combo PRO-05 | Communications Equipment Portfolio | Return Before Taxes | Communications Equipment Portfolio-Default

Risk/Return:

rr_RiskReturnAbstract

Column

rr_AverageAnnualReturnColumnName

Communications Equipment Portfolio

Label

rr_AverageAnnualReturnLabel

Return Before Taxes

Past 1 year

rr_AverageAnnualReturnYear01

19.88%

Past 5 years

rr_AverageAnnualReturnYear05

10.95%

Past 10 years

rr_AverageAnnualReturnYear10

6.22%

02.28 Select Portfolios: Group 7 Information Technology Sector Combo PRO-05 | Communications Equipment Portfolio | After Taxes on Distributions | Communications Equipment Portfolio-Default

Risk/Return:

rr_RiskReturnAbstract

Column

rr_AverageAnnualReturnColumnName

Communications Equipment Portfolio

Label

rr_AverageAnnualReturnLabel

Return After Taxes on Distributions

Past 1 year

rr_AverageAnnualReturnYear01

19.55%

Past 5 years

rr_AverageAnnualReturnYear05

10.19%

Past 10 years

rr_AverageAnnualReturnYear10

5.84%

02.28 Select Portfolios: Group 7 Information Technology Sector Combo PRO-05 | Communications Equipment Portfolio | After Taxes on Distributions and Sales | Communications Equipment Portfolio-Default

Risk/Return:

rr_RiskReturnAbstract

Column

rr_AverageAnnualReturnColumnName

Communications Equipment Portfolio

Label

rr_AverageAnnualReturnLabel

Return After Taxes on Distributions and Sale of Fund Shares

Past 1 year

rr_AverageAnnualReturnYear01

11.50%

Past 5 years

rr_AverageAnnualReturnYear05

8.52%

Past 10 years

rr_AverageAnnualReturnYear10

4.91%

02.28 Select Portfolios: Group 7 Information Technology Sector Combo PRO-05 | Communications Equipment Portfolio | S&P 500® Index(reflects no deduction for fees, expenses, or taxes)

Risk/Return:

rr_RiskReturnAbstract

Past 1 year

rr_AverageAnnualReturnYear01

11.96%

Past 5 years

rr_AverageAnnualReturnYear05

14.66%

Past 10 years

rr_AverageAnnualReturnYear10

6.95%

02.28 Select Portfolios: Group 7 Information Technology Sector Combo PRO-05 | Communications Equipment Portfolio | S&P® Custom Communications Equipment Index(reflects no deduction for fees, expenses, or taxes)

Risk/Return:

rr_RiskReturnAbstract

Past 1 year

rr_AverageAnnualReturnYear01

11.08%

Past 5 years

rr_AverageAnnualReturnYear05

9.18%

Past 10 years

rr_AverageAnnualReturnYear10

2.82%

XML

02.28 Select Portfolios: Group 7 Information Technology Sector Combo PRO-05 | Computers Portfolio

Fund Summary

Fund:
Computers Portfolio

Investment Objective

The fund seeks capital appreciation.

Fee Table

The following table describes the fees and expenses that may be incurred when you buy and hold shares of the fund.

Shareholder fees

(fees paid directly from your investment)

Shareholder Fees {- Computers Portfolio}	02.28 Select Portfolios: Group 7 Information Technology Sector Combo PRO-05 Computers Portfolio Computers Portfolio-Default
Redemption fee on shares held less than 30 days (as a % of amount redeemed)	0.75%

Annual Operating Expenses

(expenses that you pay each year as a % of the value of your investment)

Annual Operating Expenses {- Computers Portfolio}	02.28 Select Portfolios: Group 7 Information Technology Sector Combo PRO-05 Computers Portfolio Computers Portfolio-Default
Management fee	0.55%
Distribution and/or Service (12b-1) fees	none
Other expenses	0.26%
Total annual operating expenses	0.81%

This example helps compare the cost of investing in the fund with the cost of investing in other funds.

Let's say, hypothetically, that the annual return for shares of the fund is 5% and that your shareholder fees and the annual operating expenses for shares of the fund are exactly as described in the fee table. This example illustrates the effect of fees and expenses, but is not meant to suggest actual or expected fees and expenses or returns, all of which may vary. For every $10,000 you invested, here's how much you would pay in total expenses if you sell all of your shares at the end of each time period indicated:

Sell All Shares

Expense Example {- Computers Portfolio}	02.28 Select Portfolios: Group 7 Information Technology Sector Combo PRO-05 Computers Portfolio Computers Portfolio-Default USD ($)
1 year	$ 83
3 years	259
5 years	450
10 years	$ 1,002

Portfolio Turnover

The fund pays transaction costs, such as commissions, when it buys and sells securities (or "turns over" its portfolio). A higher portfolio turnover rate may indicate higher transaction costs and may result in higher taxes when fund shares are held in a taxable account. These costs, which are not reflected in annual operating expenses or in the example, affect the fund's performance. During the most recent fiscal year, the fund's portfolio turnover rate was 49% of the average value of its portfolio.

Principal Investment Strategies

• Normally investing primarily in common stocks.

• Normally investing at least 80% of assets in securities of companies principally engaged in research, design, development, manufacture, or distribution of products, processes, or services that relate to currently available or experimental hardware technology within the computer industry.

• Investing in domestic and foreign issuers.

• Using fundamental analysis of factors such as each issuer's financial condition and industry position, as well as market and economic conditions, to select investments.

Principal Investment Risks

• Stock Market Volatility. Stock markets are volatile and can decline significantly in response to adverse issuer, political, regulatory, market, or economic developments. Different parts of the market, including different market sectors, and different types of securities can react differently to these developments.

• Foreign Exposure. Foreign markets can be more volatile than the U.S. market due to increased risks of adverse issuer, political, regulatory, market, or economic developments and can perform differently from the U.S. market.

• Computer Industry Concentration. The computer industry can be significantly affected by competitive pressures, changing domestic and international demand, research and development costs, availability and price of components, and product obsolescence.

• Issuer-Specific Changes. The value of an individual security or particular type of security can be more volatile than, and can perform differently from, the market as a whole. The value of securities of smaller issuers can be more volatile than that of larger issuers.

In addition, the fund is considered non-diversified and can invest a greater portion of assets in securities of a smaller number of individual issuers than a diversified fund. As a result, changes in the market value of a single investment could cause greater fluctuations in share price than would occur in a more diversified fund.

An investment in the fund is not a deposit of a bank and is not insured or guaranteed by the Federal Deposit Insurance Corporation or any other government agency. You could lose money by investing in the fund.

Performance

The following information is intended to help you understand the risks of investing in the fund. The information illustrates the changes in the performance of the fund's shares from year to year and compares the performance of the fund's shares to the performance of a securities market index and an additional index over various periods of time. The indexes have characteristics relevant to the fund's investment strategies. Index descriptions appear in the Additional Index Information section of the prospectus. Past performance (before and after taxes) is not an indication of future performance.

Visit www.fidelity.com for more recent performance information.

Year-by-Year Returns

Calendar Years

During the periods shown in the chart:	Returns	Quarter ended
Highest Quarter Return	26.85%	September 30, 2009
Lowest Quarter Return	-28.76%	December 31, 2008
Year-to-Date Return	15.95%	March 31, 2017

Average Annual Returns

After-tax returns are calculated using the historical highest individual federal marginal income tax rates, but do not reflect the impact of state or local taxes. Actual after-tax returns may differ depending on your individual circumstances. The after-tax returns shown are not relevant if you hold your shares in a retirement account or in another tax-deferred arrangement, such as an employee benefit plan (profit sharing, 401(k), or 403(b) plan).

For the periods ended December 31, 2016

Average Annual Total Returns{- Computers Portfolio} - 02.28 Select Portfolios: Group 7 Information Technology Sector Combo PRO-05 - Computers Portfolio	Past 1 year	Past 5 years	Past 10 years
Computers Portfolio-Default | Return Before Taxes	15.81%	11.40%	8.88%
Computers Portfolio-Default | After Taxes on Distributions	14.12%	10.27%	8.32%
Computers Portfolio-Default | After Taxes on Distributions and Sales	10.36%	8.97%	7.23%
S&P 500® Index(reflects no deduction for fees, expenses, or taxes)	11.96%	14.66%	6.95%
Fidelity Computers & Peripherals Linked Index℠(reflects no deduction for fees, expenses, or taxes)	16.87%	7.85%	8.94%

XML

Label

Element

Value

Risk/Return:

rr_RiskReturnAbstract

Registrant Name

dei_EntityRegistrantName

FIDELITY SELECT PORTFOLIOS

Prospectus Date

rr_ProspectusDate

Apr. 29, 2017

02.28 Select Portfolios: Group 7 Information Technology Sector Combo PRO-05 | Computers Portfolio

Risk/Return:

rr_RiskReturnAbstract

Risk/Return [Heading]

rr_RiskReturnHeading

Fund Summary

Fund:
Computers Portfolio

Objective [Heading]

rr_ObjectiveHeading

Investment Objective

Objective, Primary [Text Block]

rr_ObjectivePrimaryTextBlock

The fund seeks capital appreciation.

Expense [Heading]

rr_ExpenseHeading

Fee Table

Expense Narrative [Text Block]

rr_ExpenseNarrativeTextBlock

The following table describes the fees and expenses that may be incurred when you buy and hold shares of the fund.

Shareholder Fees Caption [Text]

rr_ShareholderFeesCaption

Shareholder fees

(fees paid directly from your investment)

Operating Expenses Caption [Text]

rr_OperatingExpensesCaption

Annual Operating Expenses

(expenses that you pay each year as a % of the value of your investment)

Portfolio Turnover [Heading]

rr_PortfolioTurnoverHeading

Portfolio Turnover

Portfolio Turnover [Text Block]

rr_PortfolioTurnoverTextBlock

The fund pays transaction costs, such as commissions, when it buys and sells securities (or "turns over" its portfolio). A higher portfolio turnover rate may indicate higher transaction costs and may result in higher taxes when fund shares are held in a taxable account. These costs, which are not reflected in annual operating expenses or in the example, affect the fund's performance. During the most recent fiscal year, the fund's portfolio turnover rate was 49% of the average value of its portfolio.

Portfolio Turnover, Rate

rr_PortfolioTurnoverRate

49.00%

Expense Example Narrative [Text Block]

rr_ExpenseExampleNarrativeTextBlock

This example helps compare the cost of investing in the fund with the cost of investing in other funds.

Let's say, hypothetically, that the annual return for shares of the fund is 5% and that your shareholder fees and the annual operating expenses for shares of the fund are exactly as described in the fee table. This example illustrates the effect of fees and expenses, but is not meant to suggest actual or expected fees and expenses or returns, all of which may vary. For every $10,000 you invested, here's how much you would pay in total expenses if you sell all of your shares at the end of each time period indicated:

Expense Example by, Year, Caption [Text]

rr_ExpenseExampleByYearCaption

Sell All Shares

Strategy [Heading]

rr_StrategyHeading

Principal Investment Strategies

Strategy Narrative [Text Block]

rr_StrategyNarrativeTextBlock

• Normally investing primarily in common stocks.

• Normally investing at least 80% of assets in securities of companies principally engaged in research, design, development, manufacture, or distribution of products, processes, or services that relate to currently available or experimental hardware technology within the computer industry.

• Investing in domestic and foreign issuers.

• Using fundamental analysis of factors such as each issuer's financial condition and industry position, as well as market and economic conditions, to select investments.

Strategy Portfolio Concentration [Text]

rr_StrategyPortfolioConcentration

Normally investing at least 80% of assets in securities of companies principally engaged in research, design, development, manufacture, or distribution of products, processes, or services that relate to currently available or experimental hardware technology within the computer industry.

Risk [Heading]

rr_RiskHeading

Principal Investment Risks

Risk Narrative [Text Block]

rr_RiskNarrativeTextBlock

• Stock Market Volatility. Stock markets are volatile and can decline significantly in response to adverse issuer, political, regulatory, market, or economic developments. Different parts of the market, including different market sectors, and different types of securities can react differently to these developments.

• Foreign Exposure. Foreign markets can be more volatile than the U.S. market due to increased risks of adverse issuer, political, regulatory, market, or economic developments and can perform differently from the U.S. market.

• Computer Industry Concentration. The computer industry can be significantly affected by competitive pressures, changing domestic and international demand, research and development costs, availability and price of components, and product obsolescence.

• Issuer-Specific Changes. The value of an individual security or particular type of security can be more volatile than, and can perform differently from, the market as a whole. The value of securities of smaller issuers can be more volatile than that of larger issuers.

In addition, the fund is considered non-diversified and can invest a greater portion of assets in securities of a smaller number of individual issuers than a diversified fund. As a result, changes in the market value of a single investment could cause greater fluctuations in share price than would occur in a more diversified fund.

An investment in the fund is not a deposit of a bank and is not insured or guaranteed by the Federal Deposit Insurance Corporation or any other government agency. You could lose money by investing in the fund.

Risk Lose Money [Text]

rr_RiskLoseMoney

You could lose money by investing in the fund.

Risk Nondiversified Status [Text]

rr_RiskNondiversifiedStatus

In addition, the fund is considered non-diversified and can invest a greater portion of assets in securities of a smaller number of individual issuers than a diversified fund. As a result, changes in the market value of a single investment could cause greater fluctuations in share price than would occur in a more diversified fund.

Risk Not Insured Depository Institution [Text]

rr_RiskNotInsuredDepositoryInstitution

An investment in the fund is not a deposit of a bank and is not insured or guaranteed by the Federal Deposit Insurance Corporation or any other government agency.

Bar Chart and Performance Table [Heading]

rr_BarChartAndPerformanceTableHeading

Performance

Performance Narrative [Text Block]

rr_PerformanceNarrativeTextBlock

The following information is intended to help you understand the risks of investing in the fund. The information illustrates the changes in the performance of the fund's shares from year to year and compares the performance of the fund's shares to the performance of a securities market index and an additional index over various periods of time. The indexes have characteristics relevant to the fund's investment strategies. Index descriptions appear in the Additional Index Information section of the prospectus. Past performance (before and after taxes) is not an indication of future performance.

Visit www.fidelity.com for more recent performance information.

Performance Information Illustrates Variability of Returns [Text]

rr_PerformanceInformationIllustratesVariabilityOfReturns

The information illustrates the changes in the performance of the fund's shares from year to year and compares the performance of the fund's shares to the performance of a securities market index and an additional index over various periods of time.

Performance Availability Website Address [Text]

rr_PerformanceAvailabilityWebSiteAddress

www.fidelity.com

Performance Past Does Not Indicate Future [Text]

rr_PerformancePastDoesNotIndicateFuture

Past performance (before and after taxes) is not an indication of future performance.

Bar Chart [Heading]

rr_BarChartHeading

Year-by-Year Returns

Calendar Years

Bar Chart Closing [Text Block]

rr_BarChartClosingTextBlock

During the periods shown in the chart:	Returns	Quarter ended
Highest Quarter Return	26.85%	September 30, 2009
Lowest Quarter Return	-28.76%	December 31, 2008
Year-to-Date Return	15.95%	March 31, 2017

Performance Table Heading

rr_PerformanceTableHeading

Average Annual Returns

Performance Table Uses Highest Federal Rate

rr_PerformanceTableUsesHighestFederalRate

After-tax returns are calculated using the historical highest individual federal marginal income tax rates, but do not reflect the impact of state or local taxes.

Performance Table Not Relevant to Tax Deferred

rr_PerformanceTableNotRelevantToTaxDeferred

The after-tax returns shown are not relevant if you hold your shares in a retirement account or in another tax-deferred arrangement, such as an employee benefit plan (profit sharing, 401(k), or 403(b) plan).

Performance Table Narrative

rr_PerformanceTableNarrativeTextBlock

After-tax returns are calculated using the historical highest individual federal marginal income tax rates, but do not reflect the impact of state or local taxes. Actual after-tax returns may differ depending on your individual circumstances. The after-tax returns shown are not relevant if you hold your shares in a retirement account or in another tax-deferred arrangement, such as an employee benefit plan (profit sharing, 401(k), or 403(b) plan).

For the periods ended December 31, 2016

02.28 Select Portfolios: Group 7 Information Technology Sector Combo PRO-05 | Computers Portfolio | Computers Portfolio-Default

Risk/Return:

rr_RiskReturnAbstract

Redemption fee on shares held less than 30 days (as a % of amount redeemed)

rr_RedemptionFeeOverRedemption

0.75%

Management fee

rr_ManagementFeesOverAssets

0.55%

Distribution and/or Service (12b-1) fees

rr_DistributionAndService12b1FeesOverAssets

none

Other expenses

rr_OtherExpensesOverAssets

0.26%

Total annual operating expenses

rr_ExpensesOverAssets

0.81%

1 year

rr_ExpenseExampleYear01

$ 83

3 years

rr_ExpenseExampleYear03

259

5 years

rr_ExpenseExampleYear05

450

10 years

rr_ExpenseExampleYear10

$ 1,002

2007

rr_AnnualReturn2007

22.44%

2008

rr_AnnualReturn2008

(48.52%)

2009

rr_AnnualReturn2009

83.17%

2010

rr_AnnualReturn2010

23.76%

2011

rr_AnnualReturn2011

(4.48%)

2012

rr_AnnualReturn2012

14.26%

2013

rr_AnnualReturn2013

31.09%

2014

rr_AnnualReturn2014

14.73%

2015

rr_AnnualReturn2015

(13.80%)

2016

rr_AnnualReturn2016

15.81%

Year to Date Return, Label

rr_YearToDateReturnLabel

Year-to-Date Return

Bar Chart, Year to Date Return, Date

rr_BarChartYearToDateReturnDate

Mar. 31, 2017

Bar Chart, Year to Date Return

rr_BarChartYearToDateReturn

15.95%

Highest Quarterly Return, Label

rr_HighestQuarterlyReturnLabel

Highest Quarter Return

Highest Quarterly Return, Date

rr_BarChartHighestQuarterlyReturnDate

Sep. 30, 2009

Highest Quarterly Return

rr_BarChartHighestQuarterlyReturn

26.85%

Lowest Quarterly Return, Label

rr_LowestQuarterlyReturnLabel

Lowest Quarter Return

Lowest Quarterly Return, Date

rr_BarChartLowestQuarterlyReturnDate

Dec. 31, 2008

Lowest Quarterly Return

rr_BarChartLowestQuarterlyReturn

(28.76%)

02.28 Select Portfolios: Group 7 Information Technology Sector Combo PRO-05 | Computers Portfolio | Return Before Taxes | Computers Portfolio-Default

Risk/Return:

rr_RiskReturnAbstract

Column

rr_AverageAnnualReturnColumnName

Computers Portfolio

Label

rr_AverageAnnualReturnLabel

Return Before Taxes

Past 1 year

rr_AverageAnnualReturnYear01

15.81%

Past 5 years

rr_AverageAnnualReturnYear05

11.40%

Past 10 years

rr_AverageAnnualReturnYear10

8.88%

02.28 Select Portfolios: Group 7 Information Technology Sector Combo PRO-05 | Computers Portfolio | After Taxes on Distributions | Computers Portfolio-Default

Risk/Return:

rr_RiskReturnAbstract

Column

rr_AverageAnnualReturnColumnName

Computers Portfolio

Label

rr_AverageAnnualReturnLabel

Return After Taxes on Distributions

Past 1 year

rr_AverageAnnualReturnYear01

14.12%

Past 5 years

rr_AverageAnnualReturnYear05

10.27%

Past 10 years

rr_AverageAnnualReturnYear10

8.32%

02.28 Select Portfolios: Group 7 Information Technology Sector Combo PRO-05 | Computers Portfolio | After Taxes on Distributions and Sales | Computers Portfolio-Default

Risk/Return:

rr_RiskReturnAbstract

Column

rr_AverageAnnualReturnColumnName

Computers Portfolio

Label

rr_AverageAnnualReturnLabel

Return After Taxes on Distributions and Sale of Fund Shares

Past 1 year

rr_AverageAnnualReturnYear01

10.36%

Past 5 years

rr_AverageAnnualReturnYear05

8.97%

Past 10 years

rr_AverageAnnualReturnYear10

7.23%

02.28 Select Portfolios: Group 7 Information Technology Sector Combo PRO-05 | Computers Portfolio | S&P 500® Index(reflects no deduction for fees, expenses, or taxes)

Risk/Return:

rr_RiskReturnAbstract

Past 1 year

rr_AverageAnnualReturnYear01

11.96%

Past 5 years

rr_AverageAnnualReturnYear05

14.66%

Past 10 years

rr_AverageAnnualReturnYear10

6.95%

02.28 Select Portfolios: Group 7 Information Technology Sector Combo PRO-05 | Computers Portfolio | Fidelity Computers & Peripherals Linked Index℠(reflects no deduction for fees, expenses, or taxes)

Risk/Return:

rr_RiskReturnAbstract

Past 1 year

rr_AverageAnnualReturnYear01

16.87%

Past 5 years

rr_AverageAnnualReturnYear05

7.85%

Past 10 years

rr_AverageAnnualReturnYear10

8.94%

XML

02.28 Select Portfolios: Group 7 Information Technology Sector Combo PRO-05 | IT Services Portfolio

Fund Summary

Fund:
IT Services Portfolio

Investment Objective

The fund seeks capital appreciation.

Fee Table

The following table describes the fees and expenses that may be incurred when you buy and hold shares of the fund.

Shareholder fees

Shareholder Fees {- IT Services Portfolio}	02.28 Select Portfolios: Group 7 Information Technology Sector Combo PRO-05 IT Services Portfolio USD ($)
(fees paid directly from your investment)	none

Annual Operating Expenses

(expenses that you pay each year as a % of the value of your investment)

Annual Operating Expenses {- IT Services Portfolio}	02.28 Select Portfolios: Group 7 Information Technology Sector Combo PRO-05 IT Services Portfolio IT Services Portfolio-Default
Management fee	0.55%
Distribution and/or Service (12b-1) fees	none
Other expenses	0.24%
Total annual operating expenses	0.79%

This example helps compare the cost of investing in the fund with the cost of investing in other funds.

Let's say, hypothetically, that the annual return for shares of the fund is 5% and that your shareholder fees and the annual operating expenses for shares of the fund are exactly as described in the fee table. This example illustrates the effect of fees and expenses, but is not meant to suggest actual or expected fees and expenses or returns, all of which may vary. For every $10,000 you invested, here's how much you would pay in total expenses if you sell all of your shares at the end of each time period indicated:

Sell All Shares

Expense Example {- IT Services Portfolio}	02.28 Select Portfolios: Group 7 Information Technology Sector Combo PRO-05 IT Services Portfolio IT Services Portfolio-Default USD ($)
1 year	$ 81
3 years	252
5 years	439
10 years	$ 978

Portfolio Turnover

The fund pays transaction costs, such as commissions, when it buys and sells securities (or "turns over" its portfolio). A higher portfolio turnover rate may indicate higher transaction costs and may result in higher taxes when fund shares are held in a taxable account. These costs, which are not reflected in annual operating expenses or in the example, affect the fund's performance. During the most recent fiscal year, the fund's portfolio turnover rate was 27% of the average value of its portfolio.

Principal Investment Strategies

• Normally investing primarily in common stocks.

• Normally investing at least 80% of assets in securities of companies principally engaged in providing information technology services.

• Investing in domestic and foreign issuers.

• Using fundamental analysis of factors such as each issuer's financial condition and industry position, as well as market and economic conditions, to select investments.

Principal Investment Risks

• Stock Market Volatility. Stock markets are volatile and can decline significantly in response to adverse issuer, political, regulatory, market, or economic developments. Different parts of the market, including different market sectors, and different types of securities can react differently to these developments.

• Foreign Exposure. Foreign markets can be more volatile than the U.S. market due to increased risks of adverse issuer, political, regulatory, market, or economic developments and can perform differently from the U.S. market.

• IT Services Industry Concentration. The IT services industry can be significantly affected by competitive pressures, such as technological developments, fixed-rate pricing, and the ability to attract and retain skilled employees, and the success of companies in the industry is subject to continued demand for IT services.

• Issuer-Specific Changes. The value of an individual security or particular type of security can be more volatile than, and can perform differently from, the market as a whole. The value of securities of smaller issuers can be more volatile than that of larger issuers.

In addition, the fund is considered non-diversified and can invest a greater portion of assets in securities of a smaller number of individual issuers than a diversified fund. As a result, changes in the market value of a single investment could cause greater fluctuations in share price than would occur in a more diversified fund.

An investment in the fund is not a deposit of a bank and is not insured or guaranteed by the Federal Deposit Insurance Corporation or any other government agency. You could lose money by investing in the fund.

Performance

The following information is intended to help you understand the risks of investing in the fund. The information illustrates the changes in the performance of the fund's shares from year to year and compares the performance of the fund's shares to the performance of a securities market index and an additional index over various periods of time. The indexes have characteristics relevant to the fund's investment strategies. Index descriptions appear in the Additional Index Information section of the prospectus. Past performance (before and after taxes) is not an indication of future performance.

Visit www.fidelity.com for more recent performance information.

Year-by-Year Returns

Calendar Years

During the periods shown in the chart:	Returns	Quarter ended
Highest Quarter Return	23.56%	September 30, 2009
Lowest Quarter Return	-23.79%	December 31, 2008
Year-to-Date Return	7.30%	March 31, 2017

Average Annual Returns

After-tax returns are calculated using the historical highest individual federal marginal income tax rates, but do not reflect the impact of state or local taxes. Actual after-tax returns may differ depending on your individual circumstances. The after-tax returns shown are not relevant if you hold your shares in a retirement account or in another tax-deferred arrangement, such as an employee benefit plan (profit sharing, 401(k), or 403(b) plan).

For the periods ended December 31, 2016

Average Annual Total Returns{- IT Services Portfolio} - 02.28 Select Portfolios: Group 7 Information Technology Sector Combo PRO-05 - IT Services Portfolio	Past 1 year	Past 5 years	Past 10 years
IT Services Portfolio-Default | Return Before Taxes	5.19%	18.33%	12.83%
IT Services Portfolio-Default | After Taxes on Distributions	5.11%	17.37%	12.10%
IT Services Portfolio-Default | After Taxes on Distributions and Sales	3.00%	14.73%	10.58%
S&P 500® Index(reflects no deduction for fees, expenses, or taxes)	11.96%	14.66%	6.95%
MSCI U.S. IMI Information Technology Services 25-50 Index(reflects no deduction for fees, expenses, or taxes)	11.40%	15.46%	11.00%

XML

Label

Element

Value

Risk/Return:

rr_RiskReturnAbstract

Registrant Name

dei_EntityRegistrantName

FIDELITY SELECT PORTFOLIOS

Prospectus Date

rr_ProspectusDate

Apr. 29, 2017

02.28 Select Portfolios: Group 7 Information Technology Sector Combo PRO-05 | IT Services Portfolio

Risk/Return:

rr_RiskReturnAbstract

Risk/Return [Heading]

rr_RiskReturnHeading

Fund Summary

Fund:
IT Services Portfolio

Objective [Heading]

rr_ObjectiveHeading

Investment Objective

Objective, Primary [Text Block]

rr_ObjectivePrimaryTextBlock

The fund seeks capital appreciation.

Expense [Heading]

rr_ExpenseHeading

Fee Table

Expense Narrative [Text Block]

rr_ExpenseNarrativeTextBlock

The following table describes the fees and expenses that may be incurred when you buy and hold shares of the fund.

Shareholder Fees Caption [Text]

rr_ShareholderFeesCaption

Shareholder fees

(fees paid directly from your investment)

rr_ShareholderFeeOther

none

Operating Expenses Caption [Text]

rr_OperatingExpensesCaption

Annual Operating Expenses

(expenses that you pay each year as a % of the value of your investment)

Portfolio Turnover [Heading]

rr_PortfolioTurnoverHeading

Portfolio Turnover

Portfolio Turnover [Text Block]

rr_PortfolioTurnoverTextBlock

The fund pays transaction costs, such as commissions, when it buys and sells securities (or "turns over" its portfolio). A higher portfolio turnover rate may indicate higher transaction costs and may result in higher taxes when fund shares are held in a taxable account. These costs, which are not reflected in annual operating expenses or in the example, affect the fund's performance. During the most recent fiscal year, the fund's portfolio turnover rate was 27% of the average value of its portfolio.

Portfolio Turnover, Rate

rr_PortfolioTurnoverRate

27.00%

Expense Example Narrative [Text Block]

rr_ExpenseExampleNarrativeTextBlock

This example helps compare the cost of investing in the fund with the cost of investing in other funds.

Let's say, hypothetically, that the annual return for shares of the fund is 5% and that your shareholder fees and the annual operating expenses for shares of the fund are exactly as described in the fee table. This example illustrates the effect of fees and expenses, but is not meant to suggest actual or expected fees and expenses or returns, all of which may vary. For every $10,000 you invested, here's how much you would pay in total expenses if you sell all of your shares at the end of each time period indicated:

Expense Example by, Year, Caption [Text]

rr_ExpenseExampleByYearCaption

Sell All Shares

Strategy [Heading]

rr_StrategyHeading

Principal Investment Strategies

Strategy Narrative [Text Block]

rr_StrategyNarrativeTextBlock

• Normally investing primarily in common stocks.

• Normally investing at least 80% of assets in securities of companies principally engaged in providing information technology services.

• Investing in domestic and foreign issuers.

• Using fundamental analysis of factors such as each issuer's financial condition and industry position, as well as market and economic conditions, to select investments.

Strategy Portfolio Concentration [Text]

rr_StrategyPortfolioConcentration

Normally investing at least 80% of assets in securities of companies principally engaged in providing information technology services.

Risk [Heading]

rr_RiskHeading

Principal Investment Risks

Risk Narrative [Text Block]

rr_RiskNarrativeTextBlock

• Stock Market Volatility. Stock markets are volatile and can decline significantly in response to adverse issuer, political, regulatory, market, or economic developments. Different parts of the market, including different market sectors, and different types of securities can react differently to these developments.

• Foreign Exposure. Foreign markets can be more volatile than the U.S. market due to increased risks of adverse issuer, political, regulatory, market, or economic developments and can perform differently from the U.S. market.

• IT Services Industry Concentration. The IT services industry can be significantly affected by competitive pressures, such as technological developments, fixed-rate pricing, and the ability to attract and retain skilled employees, and the success of companies in the industry is subject to continued demand for IT services.

• Issuer-Specific Changes. The value of an individual security or particular type of security can be more volatile than, and can perform differently from, the market as a whole. The value of securities of smaller issuers can be more volatile than that of larger issuers.

In addition, the fund is considered non-diversified and can invest a greater portion of assets in securities of a smaller number of individual issuers than a diversified fund. As a result, changes in the market value of a single investment could cause greater fluctuations in share price than would occur in a more diversified fund.

An investment in the fund is not a deposit of a bank and is not insured or guaranteed by the Federal Deposit Insurance Corporation or any other government agency. You could lose money by investing in the fund.

Risk Lose Money [Text]

rr_RiskLoseMoney

You could lose money by investing in the fund.

Risk Nondiversified Status [Text]

rr_RiskNondiversifiedStatus

In addition, the fund is considered non-diversified and can invest a greater portion of assets in securities of a smaller number of individual issuers than a diversified fund. As a result, changes in the market value of a single investment could cause greater fluctuations in share price than would occur in a more diversified fund.

Risk Not Insured Depository Institution [Text]

rr_RiskNotInsuredDepositoryInstitution

An investment in the fund is not a deposit of a bank and is not insured or guaranteed by the Federal Deposit Insurance Corporation or any other government agency.

Bar Chart and Performance Table [Heading]

rr_BarChartAndPerformanceTableHeading

Performance

Performance Narrative [Text Block]

rr_PerformanceNarrativeTextBlock

The following information is intended to help you understand the risks of investing in the fund. The information illustrates the changes in the performance of the fund's shares from year to year and compares the performance of the fund's shares to the performance of a securities market index and an additional index over various periods of time. The indexes have characteristics relevant to the fund's investment strategies. Index descriptions appear in the Additional Index Information section of the prospectus. Past performance (before and after taxes) is not an indication of future performance.

Visit www.fidelity.com for more recent performance information.

Performance Information Illustrates Variability of Returns [Text]

rr_PerformanceInformationIllustratesVariabilityOfReturns

The information illustrates the changes in the performance of the fund's shares from year to year and compares the performance of the fund's shares to the performance of a securities market index and an additional index over various periods of time.

Performance Availability Website Address [Text]

rr_PerformanceAvailabilityWebSiteAddress

www.fidelity.com

Performance Past Does Not Indicate Future [Text]

rr_PerformancePastDoesNotIndicateFuture

Past performance (before and after taxes) is not an indication of future performance.

Bar Chart [Heading]

rr_BarChartHeading

Year-by-Year Returns

Calendar Years

Bar Chart Closing [Text Block]

rr_BarChartClosingTextBlock

During the periods shown in the chart:	Returns	Quarter ended
Highest Quarter Return	23.56%	September 30, 2009
Lowest Quarter Return	-23.79%	December 31, 2008
Year-to-Date Return	7.30%	March 31, 2017

Performance Table Heading

rr_PerformanceTableHeading

Average Annual Returns

Performance Table Uses Highest Federal Rate

rr_PerformanceTableUsesHighestFederalRate

After-tax returns are calculated using the historical highest individual federal marginal income tax rates, but do not reflect the impact of state or local taxes.

Performance Table Not Relevant to Tax Deferred

rr_PerformanceTableNotRelevantToTaxDeferred

The after-tax returns shown are not relevant if you hold your shares in a retirement account or in another tax-deferred arrangement, such as an employee benefit plan (profit sharing, 401(k), or 403(b) plan).

Performance Table Narrative

rr_PerformanceTableNarrativeTextBlock

After-tax returns are calculated using the historical highest individual federal marginal income tax rates, but do not reflect the impact of state or local taxes. Actual after-tax returns may differ depending on your individual circumstances. The after-tax returns shown are not relevant if you hold your shares in a retirement account or in another tax-deferred arrangement, such as an employee benefit plan (profit sharing, 401(k), or 403(b) plan).

For the periods ended December 31, 2016

02.28 Select Portfolios: Group 7 Information Technology Sector Combo PRO-05 | IT Services Portfolio | IT Services Portfolio-Default

Risk/Return:

rr_RiskReturnAbstract

Management fee

rr_ManagementFeesOverAssets

0.55%

Distribution and/or Service (12b-1) fees

rr_DistributionAndService12b1FeesOverAssets

none

Other expenses

rr_OtherExpensesOverAssets

0.24%

Total annual operating expenses

rr_ExpensesOverAssets

0.79%

1 year

rr_ExpenseExampleYear01

$ 81

3 years

rr_ExpenseExampleYear03

252

5 years

rr_ExpenseExampleYear05

439

10 years

rr_ExpenseExampleYear10

$ 978

2007

rr_AnnualReturn2007

11.54%

2008

rr_AnnualReturn2008

(32.91%)

2009

rr_AnnualReturn2009

59.05%

2010

rr_AnnualReturn2010

18.45%

2011

rr_AnnualReturn2011

2.25%

2012

rr_AnnualReturn2012

19.82%

2013

rr_AnnualReturn2013

53.12%

2014

rr_AnnualReturn2014

6.28%

2015

rr_AnnualReturn2015

13.13%

2016

rr_AnnualReturn2016

5.19%

Year to Date Return, Label

rr_YearToDateReturnLabel

Year-to-Date Return

Bar Chart, Year to Date Return, Date

rr_BarChartYearToDateReturnDate

Mar. 31, 2017

Bar Chart, Year to Date Return

rr_BarChartYearToDateReturn

7.30%

Highest Quarterly Return, Label

rr_HighestQuarterlyReturnLabel

Highest Quarter Return

Highest Quarterly Return, Date

rr_BarChartHighestQuarterlyReturnDate

Sep. 30, 2009

Highest Quarterly Return

rr_BarChartHighestQuarterlyReturn

23.56%

Lowest Quarterly Return, Label

rr_LowestQuarterlyReturnLabel

Lowest Quarter Return

Lowest Quarterly Return, Date

rr_BarChartLowestQuarterlyReturnDate

Dec. 31, 2008

Lowest Quarterly Return

rr_BarChartLowestQuarterlyReturn

(23.79%)

02.28 Select Portfolios: Group 7 Information Technology Sector Combo PRO-05 | IT Services Portfolio | Return Before Taxes | IT Services Portfolio-Default

Risk/Return:

rr_RiskReturnAbstract

Column

rr_AverageAnnualReturnColumnName

IT Services Portfolio

Label

rr_AverageAnnualReturnLabel

Return Before Taxes

Past 1 year

rr_AverageAnnualReturnYear01

5.19%

Past 5 years

rr_AverageAnnualReturnYear05

18.33%

Past 10 years

rr_AverageAnnualReturnYear10

12.83%

02.28 Select Portfolios: Group 7 Information Technology Sector Combo PRO-05 | IT Services Portfolio | After Taxes on Distributions | IT Services Portfolio-Default

Risk/Return:

rr_RiskReturnAbstract

Column

rr_AverageAnnualReturnColumnName

IT Services Portfolio

Label

rr_AverageAnnualReturnLabel

Return After Taxes on Distributions

Past 1 year

rr_AverageAnnualReturnYear01

5.11%

Past 5 years

rr_AverageAnnualReturnYear05

17.37%

Past 10 years

rr_AverageAnnualReturnYear10

12.10%

02.28 Select Portfolios: Group 7 Information Technology Sector Combo PRO-05 | IT Services Portfolio | After Taxes on Distributions and Sales | IT Services Portfolio-Default

Risk/Return:

rr_RiskReturnAbstract

Column

rr_AverageAnnualReturnColumnName

IT Services Portfolio

Label

rr_AverageAnnualReturnLabel

Return After Taxes on Distributions and Sale of Fund Shares

Past 1 year

rr_AverageAnnualReturnYear01

3.00%

Past 5 years

rr_AverageAnnualReturnYear05

14.73%

Past 10 years

rr_AverageAnnualReturnYear10

10.58%

02.28 Select Portfolios: Group 7 Information Technology Sector Combo PRO-05 | IT Services Portfolio | S&P 500® Index(reflects no deduction for fees, expenses, or taxes)

Risk/Return:

rr_RiskReturnAbstract

Past 1 year

rr_AverageAnnualReturnYear01

11.96%

Past 5 years

rr_AverageAnnualReturnYear05

14.66%

Past 10 years

rr_AverageAnnualReturnYear10

6.95%

02.28 Select Portfolios: Group 7 Information Technology Sector Combo PRO-05 | IT Services Portfolio | MSCI U.S. IMI Information Technology Services 25-50 Index(reflects no deduction for fees, expenses, or taxes)

Risk/Return:

rr_RiskReturnAbstract

Past 1 year

rr_AverageAnnualReturnYear01

11.40%

Past 5 years

rr_AverageAnnualReturnYear05

15.46%

Past 10 years

rr_AverageAnnualReturnYear10

11.00%

XML

02.28 Select Portfolios: Group 7 Information Technology Sector Combo PRO-05 | Semiconductors Portfolio

Fund Summary

Fund:
Semiconductors Portfolio

Investment Objective

The fund seeks capital appreciation.

Fee Table

The following table describes the fees and expenses that may be incurred when you buy and hold shares of the fund.

Shareholder fees

(fees paid directly from your investment)

Shareholder Fees {- Semiconductors Portfolio}	02.28 Select Portfolios: Group 7 Information Technology Sector Combo PRO-05 Semiconductors Portfolio Semiconductors Portfolio-Default
Redemption fee on shares held less than 30 days (as a % of amount redeemed)	0.75%

Annual Operating Expenses

(expenses that you pay each year as a % of the value of your investment)

Annual Operating Expenses {- Semiconductors Portfolio}	02.28 Select Portfolios: Group 7 Information Technology Sector Combo PRO-05 Semiconductors Portfolio Semiconductors Portfolio-Default
Management fee	0.55%
Distribution and/or Service (12b-1) fees	none
Other expenses	0.22%
Total annual operating expenses	0.77%

This example helps compare the cost of investing in the fund with the cost of investing in other funds.

Let's say, hypothetically, that the annual return for shares of the fund is 5% and that your shareholder fees and the annual operating expenses for shares of the fund are exactly as described in the fee table. This example illustrates the effect of fees and expenses, but is not meant to suggest actual or expected fees and expenses or returns, all of which may vary. For every $10,000 you invested, here's how much you would pay in total expenses if you sell all of your shares at the end of each time period indicated:

Sell All Shares

Expense Example {- Semiconductors Portfolio}	02.28 Select Portfolios: Group 7 Information Technology Sector Combo PRO-05 Semiconductors Portfolio Semiconductors Portfolio-Default USD ($)
1 year	$ 79
3 years	246
5 years	428
10 years	$ 954

Portfolio Turnover

The fund pays transaction costs, such as commissions, when it buys and sells securities (or "turns over" its portfolio). A higher portfolio turnover rate may indicate higher transaction costs and may result in higher taxes when fund shares are held in a taxable account. These costs, which are not reflected in annual operating expenses or in the example, affect the fund's performance. During the most recent fiscal year, the fund's portfolio turnover rate was 110% of the average value of its portfolio.

Principal Investment Strategies

• Normally investing primarily in common stocks.

• Normally investing at least 80% of assets in securities of companies principally engaged in the design, manufacture, or sale of electronic components; equipment vendors to electronic component manufacturers; electronic component distributors; and electronic instruments and electronic systems vendors.

• Investing in domestic and foreign issuers.

• Using fundamental analysis of factors such as each issuer's financial condition and industry position, as well as market and economic conditions, to select investments.

Principal Investment Risks

• Stock Market Volatility. Stock markets are volatile and can decline significantly in response to adverse issuer, political, regulatory, market, or economic developments. Different parts of the market, including different market sectors, and different types of securities can react differently to these developments.

• Foreign Exposure. Foreign markets can be more volatile than the U.S. market due to increased risks of adverse issuer, political, regulatory, market, or economic developments and can perform differently from the U.S. market.

• Electronics Industry Concentration. The electronics industry can be significantly affected by rapid obsolescence, intense competition, and global demand.

• Issuer-Specific Changes. The value of an individual security or particular type of security can be more volatile than, and can perform differently from, the market as a whole. The value of securities of smaller issuers can be more volatile than that of larger issuers.

In addition, the fund is considered non-diversified and can invest a greater portion of assets in securities of a smaller number of individual issuers than a diversified fund. As a result, changes in the market value of a single investment could cause greater fluctuations in share price than would occur in a more diversified fund.

An investment in the fund is not a deposit of a bank and is not insured or guaranteed by the Federal Deposit Insurance Corporation or any other government agency. You could lose money by investing in the fund.

Performance

The following information is intended to help you understand the risks of investing in the fund. The information illustrates the changes in the performance of the fund's shares from year to year and compares the performance of the fund's shares to the performance of a securities market index and an additional index over various periods of time. The indexes have characteristics relevant to the fund's investment strategies. Index descriptions appear in the Additional Index Information section of the prospectus. Past performance (before and after taxes) is not an indication of future performance.

Visit www.fidelity.com for more recent performance information.

Year-by-Year Returns

Calendar Years

During the periods shown in the chart:	Returns	Quarter ended
Highest Quarter Return	25.61%	September 30, 2009
Lowest Quarter Return	-26.31%	December 31, 2008
Year-to-Date Return	9.53%	March 31, 2017

Average Annual Returns

After-tax returns are calculated using the historical highest individual federal marginal income tax rates, but do not reflect the impact of state or local taxes. Actual after-tax returns may differ depending on your individual circumstances. The after-tax returns shown are not relevant if you hold your shares in a retirement account or in another tax-deferred arrangement, such as an employee benefit plan (profit sharing, 401(k), or 403(b) plan).

For the periods ended December 31, 2016

Average Annual Total Returns{- Semiconductors Portfolio} - 02.28 Select Portfolios: Group 7 Information Technology Sector Combo PRO-05 - Semiconductors Portfolio	Past 1 year	Past 5 years	Past 10 years
Semiconductors Portfolio-Default | Return Before Taxes	32.38%	21.98%	10.85%
Semiconductors Portfolio-Default | After Taxes on Distributions	30.94%	20.28%	10.03%
Semiconductors Portfolio-Default | After Taxes on Distributions and Sales	19.12%	17.32%	8.66%
S&P 500® Index(reflects no deduction for fees, expenses, or taxes)	11.96%	14.66%	6.95%
MSCI U.S. IMI Semiconductors & Semiconductor Equipment 25-50 Index(reflects no deduction for fees, expenses, or taxes)	31.21%	19.86%	9.31%

XML

Label

Element

Value

Risk/Return:

rr_RiskReturnAbstract

Registrant Name

dei_EntityRegistrantName

FIDELITY SELECT PORTFOLIOS

Prospectus Date

rr_ProspectusDate

Apr. 29, 2017

02.28 Select Portfolios: Group 7 Information Technology Sector Combo PRO-05 | Semiconductors Portfolio

Risk/Return:

rr_RiskReturnAbstract

Risk/Return [Heading]

rr_RiskReturnHeading

Fund Summary

Fund:
Semiconductors Portfolio

Objective [Heading]

rr_ObjectiveHeading

Investment Objective

Objective, Primary [Text Block]

rr_ObjectivePrimaryTextBlock

The fund seeks capital appreciation.

Expense [Heading]

rr_ExpenseHeading

Fee Table

Expense Narrative [Text Block]

rr_ExpenseNarrativeTextBlock

The following table describes the fees and expenses that may be incurred when you buy and hold shares of the fund.

Shareholder Fees Caption [Text]

rr_ShareholderFeesCaption

Shareholder fees

(fees paid directly from your investment)

Operating Expenses Caption [Text]

rr_OperatingExpensesCaption

Annual Operating Expenses

(expenses that you pay each year as a % of the value of your investment)

Portfolio Turnover [Heading]

rr_PortfolioTurnoverHeading

Portfolio Turnover

Portfolio Turnover [Text Block]

rr_PortfolioTurnoverTextBlock

The fund pays transaction costs, such as commissions, when it buys and sells securities (or "turns over" its portfolio). A higher portfolio turnover rate may indicate higher transaction costs and may result in higher taxes when fund shares are held in a taxable account. These costs, which are not reflected in annual operating expenses or in the example, affect the fund's performance. During the most recent fiscal year, the fund's portfolio turnover rate was 110% of the average value of its portfolio.

Portfolio Turnover, Rate

rr_PortfolioTurnoverRate

110.00%

Expense Example Narrative [Text Block]

rr_ExpenseExampleNarrativeTextBlock

This example helps compare the cost of investing in the fund with the cost of investing in other funds.

Let's say, hypothetically, that the annual return for shares of the fund is 5% and that your shareholder fees and the annual operating expenses for shares of the fund are exactly as described in the fee table. This example illustrates the effect of fees and expenses, but is not meant to suggest actual or expected fees and expenses or returns, all of which may vary. For every $10,000 you invested, here's how much you would pay in total expenses if you sell all of your shares at the end of each time period indicated:

Expense Example by, Year, Caption [Text]

rr_ExpenseExampleByYearCaption

Sell All Shares

Strategy [Heading]

rr_StrategyHeading

Principal Investment Strategies

Strategy Narrative [Text Block]

rr_StrategyNarrativeTextBlock

• Normally investing primarily in common stocks.

• Normally investing at least 80% of assets in securities of companies principally engaged in the design, manufacture, or sale of electronic components; equipment vendors to electronic component manufacturers; electronic component distributors; and electronic instruments and electronic systems vendors.

• Investing in domestic and foreign issuers.

• Using fundamental analysis of factors such as each issuer's financial condition and industry position, as well as market and economic conditions, to select investments.

Strategy Portfolio Concentration [Text]

rr_StrategyPortfolioConcentration

Normally investing at least 80% of assets in securities of companies principally engaged in the design, manufacture, or sale of electronic components; equipment vendors to electronic component manufacturers; electronic component distributors; and electronic instruments and electronic systems vendors.

Risk [Heading]

rr_RiskHeading

Principal Investment Risks

Risk Narrative [Text Block]

rr_RiskNarrativeTextBlock

• Stock Market Volatility. Stock markets are volatile and can decline significantly in response to adverse issuer, political, regulatory, market, or economic developments. Different parts of the market, including different market sectors, and different types of securities can react differently to these developments.

• Foreign Exposure. Foreign markets can be more volatile than the U.S. market due to increased risks of adverse issuer, political, regulatory, market, or economic developments and can perform differently from the U.S. market.

• Electronics Industry Concentration. The electronics industry can be significantly affected by rapid obsolescence, intense competition, and global demand.

• Issuer-Specific Changes. The value of an individual security or particular type of security can be more volatile than, and can perform differently from, the market as a whole. The value of securities of smaller issuers can be more volatile than that of larger issuers.

In addition, the fund is considered non-diversified and can invest a greater portion of assets in securities of a smaller number of individual issuers than a diversified fund. As a result, changes in the market value of a single investment could cause greater fluctuations in share price than would occur in a more diversified fund.

An investment in the fund is not a deposit of a bank and is not insured or guaranteed by the Federal Deposit Insurance Corporation or any other government agency. You could lose money by investing in the fund.

Risk Lose Money [Text]

rr_RiskLoseMoney

You could lose money by investing in the fund.

Risk Nondiversified Status [Text]

rr_RiskNondiversifiedStatus

In addition, the fund is considered non-diversified and can invest a greater portion of assets in securities of a smaller number of individual issuers than a diversified fund. As a result, changes in the market value of a single investment could cause greater fluctuations in share price than would occur in a more diversified fund.

Risk Not Insured Depository Institution [Text]

rr_RiskNotInsuredDepositoryInstitution

An investment in the fund is not a deposit of a bank and is not insured or guaranteed by the Federal Deposit Insurance Corporation or any other government agency.

Bar Chart and Performance Table [Heading]

rr_BarChartAndPerformanceTableHeading

Performance

Performance Narrative [Text Block]

rr_PerformanceNarrativeTextBlock

The following information is intended to help you understand the risks of investing in the fund. The information illustrates the changes in the performance of the fund's shares from year to year and compares the performance of the fund's shares to the performance of a securities market index and an additional index over various periods of time. The indexes have characteristics relevant to the fund's investment strategies. Index descriptions appear in the Additional Index Information section of the prospectus. Past performance (before and after taxes) is not an indication of future performance.

Visit www.fidelity.com for more recent performance information.

Performance Information Illustrates Variability of Returns [Text]

rr_PerformanceInformationIllustratesVariabilityOfReturns

The information illustrates the changes in the performance of the fund's shares from year to year and compares the performance of the fund's shares to the performance of a securities market index and an additional index over various periods of time.

Performance Availability Website Address [Text]

rr_PerformanceAvailabilityWebSiteAddress

www.fidelity.com

Performance Past Does Not Indicate Future [Text]

rr_PerformancePastDoesNotIndicateFuture

Past performance (before and after taxes) is not an indication of future performance.

Bar Chart [Heading]

rr_BarChartHeading

Year-by-Year Returns

Calendar Years

Bar Chart Closing [Text Block]

rr_BarChartClosingTextBlock

During the periods shown in the chart:	Returns	Quarter ended
Highest Quarter Return	25.61%	September 30, 2009
Lowest Quarter Return	-26.31%	December 31, 2008
Year-to-Date Return	9.53%	March 31, 2017

Performance Table Heading

rr_PerformanceTableHeading

Average Annual Returns

Performance Table Uses Highest Federal Rate

rr_PerformanceTableUsesHighestFederalRate

After-tax returns are calculated using the historical highest individual federal marginal income tax rates, but do not reflect the impact of state or local taxes.

Performance Table Not Relevant to Tax Deferred

rr_PerformanceTableNotRelevantToTaxDeferred

The after-tax returns shown are not relevant if you hold your shares in a retirement account or in another tax-deferred arrangement, such as an employee benefit plan (profit sharing, 401(k), or 403(b) plan).

Performance Table Narrative

rr_PerformanceTableNarrativeTextBlock

After-tax returns are calculated using the historical highest individual federal marginal income tax rates, but do not reflect the impact of state or local taxes. Actual after-tax returns may differ depending on your individual circumstances. The after-tax returns shown are not relevant if you hold your shares in a retirement account or in another tax-deferred arrangement, such as an employee benefit plan (profit sharing, 401(k), or 403(b) plan).

For the periods ended December 31, 2016

02.28 Select Portfolios: Group 7 Information Technology Sector Combo PRO-05 | Semiconductors Portfolio | Semiconductors Portfolio-Default

Risk/Return:

rr_RiskReturnAbstract

Redemption fee on shares held less than 30 days (as a % of amount redeemed)

rr_RedemptionFeeOverRedemption

0.75%

Management fee

rr_ManagementFeesOverAssets

0.55%

Distribution and/or Service (12b-1) fees

rr_DistributionAndService12b1FeesOverAssets

none

Other expenses

rr_OtherExpensesOverAssets

0.22%

Total annual operating expenses

rr_ExpensesOverAssets

0.77%

1 year

rr_ExpenseExampleYear01

$ 79

3 years

rr_ExpenseExampleYear03

246

5 years

rr_ExpenseExampleYear05

428

10 years

rr_ExpenseExampleYear10

$ 954

2007

rr_AnnualReturn2007

4.67%

2008

rr_AnnualReturn2008

(49.87%)

2009

rr_AnnualReturn2009

84.99%

2010

rr_AnnualReturn2010

16.84%

2011

rr_AnnualReturn2011

(8.49%)

2012

rr_AnnualReturn2012

3.60%

2013

rr_AnnualReturn2013

39.18%

2014

rr_AnnualReturn2014

38.37%

2015

rr_AnnualReturn2015

2.24%

2016

rr_AnnualReturn2016

32.38%

Year to Date Return, Label

rr_YearToDateReturnLabel

Year-to-Date Return

Bar Chart, Year to Date Return, Date

rr_BarChartYearToDateReturnDate

Mar. 31, 2017

Bar Chart, Year to Date Return

rr_BarChartYearToDateReturn

9.53%

Highest Quarterly Return, Label

rr_HighestQuarterlyReturnLabel

Highest Quarter Return

Highest Quarterly Return, Date

rr_BarChartHighestQuarterlyReturnDate

Sep. 30, 2009

Highest Quarterly Return

rr_BarChartHighestQuarterlyReturn

25.61%

Lowest Quarterly Return, Label

rr_LowestQuarterlyReturnLabel

Lowest Quarter Return

Lowest Quarterly Return, Date

rr_BarChartLowestQuarterlyReturnDate

Dec. 31, 2008

Lowest Quarterly Return

rr_BarChartLowestQuarterlyReturn

(26.31%)

02.28 Select Portfolios: Group 7 Information Technology Sector Combo PRO-05 | Semiconductors Portfolio | Return Before Taxes | Semiconductors Portfolio-Default

Risk/Return:

rr_RiskReturnAbstract

Column

rr_AverageAnnualReturnColumnName

Semiconductors Portfolio

Label

rr_AverageAnnualReturnLabel

Return Before Taxes

Past 1 year

rr_AverageAnnualReturnYear01

32.38%

Past 5 years

rr_AverageAnnualReturnYear05

21.98%

Past 10 years

rr_AverageAnnualReturnYear10

10.85%

02.28 Select Portfolios: Group 7 Information Technology Sector Combo PRO-05 | Semiconductors Portfolio | After Taxes on Distributions | Semiconductors Portfolio-Default

Risk/Return:

rr_RiskReturnAbstract

Column

rr_AverageAnnualReturnColumnName

Semiconductors Portfolio

Label

rr_AverageAnnualReturnLabel

Return After Taxes on Distributions

Past 1 year

rr_AverageAnnualReturnYear01

30.94%

Past 5 years

rr_AverageAnnualReturnYear05

20.28%

Past 10 years

rr_AverageAnnualReturnYear10

10.03%

02.28 Select Portfolios: Group 7 Information Technology Sector Combo PRO-05 | Semiconductors Portfolio | After Taxes on Distributions and Sales | Semiconductors Portfolio-Default

Risk/Return:

rr_RiskReturnAbstract

Column

rr_AverageAnnualReturnColumnName

Semiconductors Portfolio

Label

rr_AverageAnnualReturnLabel

Return After Taxes on Distributions and Sale of Fund Shares

Past 1 year

rr_AverageAnnualReturnYear01

19.12%

Past 5 years

rr_AverageAnnualReturnYear05

17.32%

Past 10 years

rr_AverageAnnualReturnYear10

8.66%

02.28 Select Portfolios: Group 7 Information Technology Sector Combo PRO-05 | Semiconductors Portfolio | S&P 500® Index(reflects no deduction for fees, expenses, or taxes)

Risk/Return:

rr_RiskReturnAbstract

Past 1 year

rr_AverageAnnualReturnYear01

11.96%

Past 5 years

rr_AverageAnnualReturnYear05

14.66%

Past 10 years

rr_AverageAnnualReturnYear10

6.95%

02.28 Select Portfolios: Group 7 Information Technology Sector Combo PRO-05 | Semiconductors Portfolio | MSCI U.S. IMI Semiconductors & Semiconductor Equipment 25-50 Index(reflects no deduction for fees, expenses, or taxes)

Risk/Return:

rr_RiskReturnAbstract

Past 1 year

rr_AverageAnnualReturnYear01

31.21%

Past 5 years

rr_AverageAnnualReturnYear05

19.86%

Past 10 years

rr_AverageAnnualReturnYear10

9.31%

XML

02.28 Select Portfolios: Group 7 Information Technology Sector Combo PRO-05 | Software and IT Services Portfolio

Fund Summary

Fund:
Software and IT Services Portfolio

Investment Objective

The fund seeks capital appreciation.

Fee Table

The following table describes the fees and expenses that may be incurred when you buy and hold shares of the fund.

Shareholder fees

Shareholder Fees {- Software and IT Services Portfolio}	02.28 Select Portfolios: Group 7 Information Technology Sector Combo PRO-05 Software and IT Services Portfolio USD ($)
(fees paid directly from your investment)	none

Annual Operating Expenses

(expenses that you pay each year as a % of the value of your investment)

Annual Operating Expenses {- Software and IT Services Portfolio}	02.28 Select Portfolios: Group 7 Information Technology Sector Combo PRO-05 Software and IT Services Portfolio Software and IT Services Portfolio-Default
Management fee	0.55%
Distribution and/or Service (12b-1) fees	none
Other expenses	0.21%
Total annual operating expenses	0.76%

This example helps compare the cost of investing in the fund with the cost of investing in other funds.

Let's say, hypothetically, that the annual return for shares of the fund is 5% and that your shareholder fees and the annual operating expenses for shares of the fund are exactly as described in the fee table. This example illustrates the effect of fees and expenses, but is not meant to suggest actual or expected fees and expenses or returns, all of which may vary. For every $10,000 you invested, here's how much you would pay in total expenses if you sell all of your shares at the end of each time period indicated:

Sell All Shares

Expense Example {- Software and IT Services Portfolio}	02.28 Select Portfolios: Group 7 Information Technology Sector Combo PRO-05 Software and IT Services Portfolio Software and IT Services Portfolio-Default USD ($)
1 year	$ 78
3 years	243
5 years	422
10 years	$ 942

Portfolio Turnover

The fund pays transaction costs, such as commissions, when it buys and sells securities (or "turns over" its portfolio). A higher portfolio turnover rate may indicate higher transaction costs and may result in higher taxes when fund shares are held in a taxable account. These costs, which are not reflected in annual operating expenses or in the example, affect the fund's performance. During the most recent fiscal year, the fund's portfolio turnover rate was 44% of the average value of its portfolio.

Principal Investment Strategies

• Normally investing primarily in common stocks.

• Normally investing at least 80% of assets in securities of companies principally engaged in research, design, production, or distribution of products or processes that relate to software or information-based services.

• Investing in domestic and foreign issuers.

• Using fundamental analysis of factors such as each issuer's financial condition and industry position, as well as market and economic conditions, to select investments.

Principal Investment Risks

• Stock Market Volatility. Stock markets are volatile and can decline significantly in response to adverse issuer, political, regulatory, market, or economic developments. Different parts of the market, including different market sectors, and different types of securities can react differently to these developments.

• Foreign Exposure. Foreign markets can be more volatile than the U.S. market due to increased risks of adverse issuer, political, regulatory, market, or economic developments and can perform differently from the U.S. market.

• Software and Information Technology Services Industry Concentration. The software and information technology services industry can be significantly affected by intense competition, aggressive pricing, technological innovations, and product obsolescence.

• Issuer-Specific Changes. The value of an individual security or particular type of security can be more volatile than, and can perform differently from, the market as a whole. The value of securities of smaller issuers can be more volatile than that of larger issuers.

In addition, the fund is considered non-diversified and can invest a greater portion of assets in securities of a smaller number of individual issuers than a diversified fund. As a result, changes in the market value of a single investment could cause greater fluctuations in share price than would occur in a more diversified fund.

An investment in the fund is not a deposit of a bank and is not insured or guaranteed by the Federal Deposit Insurance Corporation or any other government agency. You could lose money by investing in the fund.

Performance

The following information is intended to help you understand the risks of investing in the fund. The information illustrates the changes in the performance of the fund's shares from year to year and compares the performance of the fund's shares to the performance of a securities market index and an additional index over various periods of time. The indexes have characteristics relevant to the fund's investment strategies. Index descriptions appear in the Additional Index Information section of the prospectus. Past performance (before and after taxes) is not an indication of future performance.

Visit www.fidelity.com for more recent performance information.

Year-by-Year Returns

Calendar Years

During the periods shown in the chart:	Returns	Quarter ended
Highest Quarter Return	20.44%	March 31, 2012
Lowest Quarter Return	-20.77%	December 31, 2008
Year-to-Date Return	11.24%	March 31, 2017

Average Annual Returns

After-tax returns are calculated using the historical highest individual federal marginal income tax rates, but do not reflect the impact of state or local taxes. Actual after-tax returns may differ depending on your individual circumstances. The after-tax returns shown are not relevant if you hold your shares in a retirement account or in another tax-deferred arrangement, such as an employee benefit plan (profit sharing, 401(k), or 403(b) plan).

For the periods ended December 31, 2016

Average Annual Total Returns{- Software and IT Services Portfolio} - 02.28 Select Portfolios: Group 7 Information Technology Sector Combo PRO-05 - Software and IT Services Portfolio	Past 1 year	Past 5 years	Past 10 years
Software and IT Services Portfolio-Default | Return Before Taxes	10.31%	18.66%	12.72%
Software and IT Services Portfolio-Default | After Taxes on Distributions	9.13%	16.57%	11.31%
Software and IT Services Portfolio-Default | After Taxes on Distributions and Sales	6.49%	14.60%	10.19%
S&P 500® Index(reflects no deduction for fees, expenses, or taxes)	11.96%	14.66%	6.95%
MSCI U.S. IMI Software & Services 25-50 Index(reflects no deduction for fees, expenses, or taxes)	8.57%	17.12%	10.86%

XML

Label

Element

Value

Risk/Return:

rr_RiskReturnAbstract

Registrant Name

dei_EntityRegistrantName

FIDELITY SELECT PORTFOLIOS

Prospectus Date

rr_ProspectusDate

Apr. 29, 2017

02.28 Select Portfolios: Group 7 Information Technology Sector Combo PRO-05 | Software and IT Services Portfolio

Risk/Return:

rr_RiskReturnAbstract

Risk/Return [Heading]

rr_RiskReturnHeading

Fund Summary

Fund:
Software and IT Services Portfolio

Objective [Heading]

rr_ObjectiveHeading

Investment Objective

Objective, Primary [Text Block]

rr_ObjectivePrimaryTextBlock

The fund seeks capital appreciation.

Expense [Heading]

rr_ExpenseHeading

Fee Table

Expense Narrative [Text Block]

rr_ExpenseNarrativeTextBlock

The following table describes the fees and expenses that may be incurred when you buy and hold shares of the fund.

Shareholder Fees Caption [Text]

rr_ShareholderFeesCaption

Shareholder fees

(fees paid directly from your investment)

rr_ShareholderFeeOther

none

Operating Expenses Caption [Text]

rr_OperatingExpensesCaption

Annual Operating Expenses

(expenses that you pay each year as a % of the value of your investment)

Portfolio Turnover [Heading]

rr_PortfolioTurnoverHeading

Portfolio Turnover

Portfolio Turnover [Text Block]

rr_PortfolioTurnoverTextBlock

The fund pays transaction costs, such as commissions, when it buys and sells securities (or "turns over" its portfolio). A higher portfolio turnover rate may indicate higher transaction costs and may result in higher taxes when fund shares are held in a taxable account. These costs, which are not reflected in annual operating expenses or in the example, affect the fund's performance. During the most recent fiscal year, the fund's portfolio turnover rate was 44% of the average value of its portfolio.

Portfolio Turnover, Rate

rr_PortfolioTurnoverRate

44.00%

Expense Example Narrative [Text Block]

rr_ExpenseExampleNarrativeTextBlock

This example helps compare the cost of investing in the fund with the cost of investing in other funds.

Let's say, hypothetically, that the annual return for shares of the fund is 5% and that your shareholder fees and the annual operating expenses for shares of the fund are exactly as described in the fee table. This example illustrates the effect of fees and expenses, but is not meant to suggest actual or expected fees and expenses or returns, all of which may vary. For every $10,000 you invested, here's how much you would pay in total expenses if you sell all of your shares at the end of each time period indicated:

Expense Example by, Year, Caption [Text]

rr_ExpenseExampleByYearCaption

Sell All Shares

Strategy [Heading]

rr_StrategyHeading

Principal Investment Strategies

Strategy Narrative [Text Block]

rr_StrategyNarrativeTextBlock

• Normally investing primarily in common stocks.

• Normally investing at least 80% of assets in securities of companies principally engaged in research, design, production, or distribution of products or processes that relate to software or information-based services.

• Investing in domestic and foreign issuers.

• Using fundamental analysis of factors such as each issuer's financial condition and industry position, as well as market and economic conditions, to select investments.

Strategy Portfolio Concentration [Text]

rr_StrategyPortfolioConcentration

Normally investing at least 80% of assets in securities of companies principally engaged in research, design, production, or distribution of products or processes that relate to software or information-based services.

Risk [Heading]

rr_RiskHeading

Principal Investment Risks

Risk Narrative [Text Block]

rr_RiskNarrativeTextBlock

• Stock Market Volatility. Stock markets are volatile and can decline significantly in response to adverse issuer, political, regulatory, market, or economic developments. Different parts of the market, including different market sectors, and different types of securities can react differently to these developments.

• Foreign Exposure. Foreign markets can be more volatile than the U.S. market due to increased risks of adverse issuer, political, regulatory, market, or economic developments and can perform differently from the U.S. market.

• Software and Information Technology Services Industry Concentration. The software and information technology services industry can be significantly affected by intense competition, aggressive pricing, technological innovations, and product obsolescence.

• Issuer-Specific Changes. The value of an individual security or particular type of security can be more volatile than, and can perform differently from, the market as a whole. The value of securities of smaller issuers can be more volatile than that of larger issuers.

In addition, the fund is considered non-diversified and can invest a greater portion of assets in securities of a smaller number of individual issuers than a diversified fund. As a result, changes in the market value of a single investment could cause greater fluctuations in share price than would occur in a more diversified fund.

An investment in the fund is not a deposit of a bank and is not insured or guaranteed by the Federal Deposit Insurance Corporation or any other government agency. You could lose money by investing in the fund.

Risk Lose Money [Text]

rr_RiskLoseMoney

You could lose money by investing in the fund.

Risk Nondiversified Status [Text]

rr_RiskNondiversifiedStatus

In addition, the fund is considered non-diversified and can invest a greater portion of assets in securities of a smaller number of individual issuers than a diversified fund. As a result, changes in the market value of a single investment could cause greater fluctuations in share price than would occur in a more diversified fund.

Risk Not Insured Depository Institution [Text]

rr_RiskNotInsuredDepositoryInstitution

An investment in the fund is not a deposit of a bank and is not insured or guaranteed by the Federal Deposit Insurance Corporation or any other government agency.

Bar Chart and Performance Table [Heading]

rr_BarChartAndPerformanceTableHeading

Performance

Performance Narrative [Text Block]

rr_PerformanceNarrativeTextBlock

The following information is intended to help you understand the risks of investing in the fund. The information illustrates the changes in the performance of the fund's shares from year to year and compares the performance of the fund's shares to the performance of a securities market index and an additional index over various periods of time. The indexes have characteristics relevant to the fund's investment strategies. Index descriptions appear in the Additional Index Information section of the prospectus. Past performance (before and after taxes) is not an indication of future performance.

Visit www.fidelity.com for more recent performance information.

Performance Information Illustrates Variability of Returns [Text]

rr_PerformanceInformationIllustratesVariabilityOfReturns

The information illustrates the changes in the performance of the fund's shares from year to year and compares the performance of the fund's shares to the performance of a securities market index and an additional index over various periods of time.

Performance Availability Website Address [Text]

rr_PerformanceAvailabilityWebSiteAddress

www.fidelity.com

Performance Past Does Not Indicate Future [Text]

rr_PerformancePastDoesNotIndicateFuture

Past performance (before and after taxes) is not an indication of future performance.

Bar Chart [Heading]

rr_BarChartHeading

Year-by-Year Returns

Calendar Years

Bar Chart Closing [Text Block]

rr_BarChartClosingTextBlock

During the periods shown in the chart:	Returns	Quarter ended
Highest Quarter Return	20.44%	March 31, 2012
Lowest Quarter Return	-20.77%	December 31, 2008
Year-to-Date Return	11.24%	March 31, 2017

Performance Table Heading

rr_PerformanceTableHeading

Average Annual Returns

Performance Table Uses Highest Federal Rate

rr_PerformanceTableUsesHighestFederalRate

After-tax returns are calculated using the historical highest individual federal marginal income tax rates, but do not reflect the impact of state or local taxes.

Performance Table Not Relevant to Tax Deferred

rr_PerformanceTableNotRelevantToTaxDeferred

The after-tax returns shown are not relevant if you hold your shares in a retirement account or in another tax-deferred arrangement, such as an employee benefit plan (profit sharing, 401(k), or 403(b) plan).

Performance Table Narrative

rr_PerformanceTableNarrativeTextBlock

After-tax returns are calculated using the historical highest individual federal marginal income tax rates, but do not reflect the impact of state or local taxes. Actual after-tax returns may differ depending on your individual circumstances. The after-tax returns shown are not relevant if you hold your shares in a retirement account or in another tax-deferred arrangement, such as an employee benefit plan (profit sharing, 401(k), or 403(b) plan).

For the periods ended December 31, 2016

02.28 Select Portfolios: Group 7 Information Technology Sector Combo PRO-05 | Software and IT Services Portfolio | Software and IT Services Portfolio-Default

Risk/Return:

rr_RiskReturnAbstract

Management fee

rr_ManagementFeesOverAssets

0.55%

Distribution and/or Service (12b-1) fees

rr_DistributionAndService12b1FeesOverAssets

none

Other expenses

rr_OtherExpensesOverAssets

0.21%

Total annual operating expenses

rr_ExpensesOverAssets

0.76%

1 year

rr_ExpenseExampleYear01

$ 78

3 years

rr_ExpenseExampleYear03

243

5 years

rr_ExpenseExampleYear05

422

10 years

rr_ExpenseExampleYear10

$ 942

2007

rr_AnnualReturn2007

23.88%

2008

rr_AnnualReturn2008

(42.14%)

2009

rr_AnnualReturn2009

61.51%

2010

rr_AnnualReturn2010

18.94%

2011

rr_AnnualReturn2011

2.18%

2012

rr_AnnualReturn2012

18.06%

2013

rr_AnnualReturn2013

51.12%

2014

rr_AnnualReturn2014

8.22%

2015

rr_AnnualReturn2015

10.47%

2016

rr_AnnualReturn2016

10.31%

Year to Date Return, Label

rr_YearToDateReturnLabel

Year-to-Date Return

Bar Chart, Year to Date Return, Date

rr_BarChartYearToDateReturnDate

Mar. 31, 2017

Bar Chart, Year to Date Return

rr_BarChartYearToDateReturn

11.24%

Highest Quarterly Return, Label

rr_HighestQuarterlyReturnLabel

Highest Quarter Return

Highest Quarterly Return, Date

rr_BarChartHighestQuarterlyReturnDate

Mar. 31, 2012

Highest Quarterly Return

rr_BarChartHighestQuarterlyReturn

20.44%

Lowest Quarterly Return, Label

rr_LowestQuarterlyReturnLabel

Lowest Quarter Return

Lowest Quarterly Return, Date

rr_BarChartLowestQuarterlyReturnDate

Dec. 31, 2008

Lowest Quarterly Return

rr_BarChartLowestQuarterlyReturn

(20.77%)

02.28 Select Portfolios: Group 7 Information Technology Sector Combo PRO-05 | Software and IT Services Portfolio | Return Before Taxes | Software and IT Services Portfolio-Default

Risk/Return:

rr_RiskReturnAbstract

Column

rr_AverageAnnualReturnColumnName

Software and IT Services Portfolio

Label

rr_AverageAnnualReturnLabel

Return Before Taxes

Past 1 year

rr_AverageAnnualReturnYear01

10.31%

Past 5 years

rr_AverageAnnualReturnYear05

18.66%

Past 10 years

rr_AverageAnnualReturnYear10

12.72%

02.28 Select Portfolios: Group 7 Information Technology Sector Combo PRO-05 | Software and IT Services Portfolio | After Taxes on Distributions | Software and IT Services Portfolio-Default

Risk/Return:

rr_RiskReturnAbstract

Column

rr_AverageAnnualReturnColumnName

Software and IT Services Portfolio

Label

rr_AverageAnnualReturnLabel

Return After Taxes on Distributions

Past 1 year

rr_AverageAnnualReturnYear01

9.13%

Past 5 years

rr_AverageAnnualReturnYear05

16.57%

Past 10 years

rr_AverageAnnualReturnYear10

11.31%

02.28 Select Portfolios: Group 7 Information Technology Sector Combo PRO-05 | Software and IT Services Portfolio | After Taxes on Distributions and Sales | Software and IT Services Portfolio-Default

Risk/Return:

rr_RiskReturnAbstract

Column

rr_AverageAnnualReturnColumnName

Software and IT Services Portfolio

Label

rr_AverageAnnualReturnLabel

Return After Taxes on Distributions and Sale of Fund Shares

Past 1 year

rr_AverageAnnualReturnYear01

6.49%

Past 5 years

rr_AverageAnnualReturnYear05

14.60%

Past 10 years

rr_AverageAnnualReturnYear10

10.19%

02.28 Select Portfolios: Group 7 Information Technology Sector Combo PRO-05 | Software and IT Services Portfolio | S&P 500® Index(reflects no deduction for fees, expenses, or taxes)

Risk/Return:

rr_RiskReturnAbstract

Past 1 year

rr_AverageAnnualReturnYear01

11.96%

Past 5 years

rr_AverageAnnualReturnYear05

14.66%

Past 10 years

rr_AverageAnnualReturnYear10

6.95%

02.28 Select Portfolios: Group 7 Information Technology Sector Combo PRO-05 | Software and IT Services Portfolio | MSCI U.S. IMI Software & Services 25-50 Index(reflects no deduction for fees, expenses, or taxes)

Risk/Return:

rr_RiskReturnAbstract

Past 1 year

rr_AverageAnnualReturnYear01

8.57%

Past 5 years

rr_AverageAnnualReturnYear05

17.12%

Past 10 years

rr_AverageAnnualReturnYear10

10.86%

XML

02.28 Select Portfolios: Group 7 Information Technology Sector Combo PRO-05 | Technology Portfolio

Fund Summary

Fund:
Technology Portfolio

Investment Objective

The fund seeks capital appreciation.

Fee Table

The following table describes the fees and expenses that may be incurred when you buy and hold shares of the fund.

Shareholder fees

Shareholder Fees {- Technology Portfolio}	02.28 Select Portfolios: Group 7 Information Technology Sector Combo PRO-05 Technology Portfolio USD ($)
(fees paid directly from your investment)	none

Annual Operating Expenses

(expenses that you pay each year as a % of the value of your investment)

Annual Operating Expenses {- Technology Portfolio}	02.28 Select Portfolios: Group 7 Information Technology Sector Combo PRO-05 Technology Portfolio Technology Portfolio-Default
Management fee	0.55%
Distribution and/or Service (12b-1) fees	none
Other expenses	0.22%
Total annual operating expenses	0.77%

This example helps compare the cost of investing in the fund with the cost of investing in other funds.

Let's say, hypothetically, that the annual return for shares of the fund is 5% and that your shareholder fees and the annual operating expenses for shares of the fund are exactly as described in the fee table. This example illustrates the effect of fees and expenses, but is not meant to suggest actual or expected fees and expenses or returns, all of which may vary. For every $10,000 you invested, here's how much you would pay in total expenses if you sell all of your shares at the end of each time period indicated:

Sell All Shares

Expense Example {- Technology Portfolio}	02.28 Select Portfolios: Group 7 Information Technology Sector Combo PRO-05 Technology Portfolio Technology Portfolio-Default USD ($)
1 year	$ 79
3 years	246
5 years	428
10 years	$ 954

Portfolio Turnover

The fund pays transaction costs, such as commissions, when it buys and sells securities (or "turns over" its portfolio). A higher portfolio turnover rate may indicate higher transaction costs and may result in higher taxes when fund shares are held in a taxable account. These costs, which are not reflected in annual operating expenses or in the example, affect the fund's performance. During the most recent fiscal year, the fund's portfolio turnover rate was 82% of the average value of its portfolio.

Principal Investment Strategies

• Normally investing primarily in common stocks.

• Normally investing at least 80% of assets in securities of companies principally engaged in offering, using, or developing products, processes, or services that will provide or will benefit significantly from technological advances and improvements.

• Investing in domestic and foreign issuers.

• Using fundamental analysis of factors such as each issuer's financial condition and industry position, as well as market and economic conditions, to select investments.

Principal Investment Risks

• Stock Market Volatility. Stock markets are volatile and can decline significantly in response to adverse issuer, political, regulatory, market, or economic developments. Different parts of the market, including different market sectors, and different types of securities can react differently to these developments.

• Foreign Exposure. Foreign markets, particularly emerging markets, can be more volatile than the U.S. market due to increased risks of adverse issuer, political, regulatory, market, or economic developments and can perform differently from the U.S. market.

• Technology Industry Concentration. The technology industries can be significantly affected by obsolescence of existing technology, short product cycles, falling prices and profits, competition from new market entrants, and general economic conditions.

• Issuer-Specific Changes. The value of an individual security or particular type of security can be more volatile than, and can perform differently from, the market as a whole. The value of securities of smaller issuers can be more volatile than that of larger issuers.

In addition, the fund is considered non-diversified and can invest a greater portion of assets in securities of a smaller number of individual issuers than a diversified fund. As a result, changes in the market value of a single investment could cause greater fluctuations in share price than would occur in a more diversified fund.

An investment in the fund is not a deposit of a bank and is not insured or guaranteed by the Federal Deposit Insurance Corporation or any other government agency. You could lose money by investing in the fund.

Performance

The following information is intended to help you understand the risks of investing in the fund. The information illustrates the changes in the performance of the fund's shares from year to year and compares the performance of the fund's shares to the performance of a securities market index and an additional index over various periods of time. The indexes have characteristics relevant to the fund's investment strategies. Index descriptions appear in the Additional Index Information section of the prospectus. Past performance (before and after taxes) is not an indication of future performance.

Visit www.fidelity.com for more recent performance information.

Year-by-Year Returns

Calendar Years

During the periods shown in the chart:	Returns	Quarter ended
Highest Quarter Return	32.35%	June 30, 2009
Lowest Quarter Return	-27.69%	December 31, 2008
Year-to-Date Return	17.41%	March 31, 2017

Average Annual Returns

After-tax returns are calculated using the historical highest individual federal marginal income tax rates, but do not reflect the impact of state or local taxes. Actual after-tax returns may differ depending on your individual circumstances. The after-tax returns shown are not relevant if you hold your shares in a retirement account or in another tax-deferred arrangement, such as an employee benefit plan (profit sharing, 401(k), or 403(b) plan).

For the periods ended December 31, 2016

Average Annual Total Returns{- Technology Portfolio} - 02.28 Select Portfolios: Group 7 Information Technology Sector Combo PRO-05 - Technology Portfolio	Past 1 year	Past 5 years	Past 10 years
Technology Portfolio-Default | Return Before Taxes	11.94%	15.48%	10.12%
Technology Portfolio-Default | After Taxes on Distributions	11.53%	13.35%	9.10%
Technology Portfolio-Default | After Taxes on Distributions and Sales	7.09%	11.72%	7.99%
S&P 500® Index(reflects no deduction for fees, expenses, or taxes)	11.96%	14.66%	6.95%
MSCI U.S. IMI Information Technology 25-50 Index(reflects no deduction for fees, expenses, or taxes)	13.85%	16.19%	9.93%

XML

Label

Element

Value

Risk/Return:

rr_RiskReturnAbstract

Registrant Name

dei_EntityRegistrantName

FIDELITY SELECT PORTFOLIOS

Prospectus Date

rr_ProspectusDate

Apr. 29, 2017

02.28 Select Portfolios: Group 7 Information Technology Sector Combo PRO-05 | Technology Portfolio

Risk/Return:

rr_RiskReturnAbstract

Risk/Return [Heading]

rr_RiskReturnHeading

Fund Summary

Fund:
Technology Portfolio

Objective [Heading]

rr_ObjectiveHeading

Investment Objective

Objective, Primary [Text Block]

rr_ObjectivePrimaryTextBlock

The fund seeks capital appreciation.

Expense [Heading]

rr_ExpenseHeading

Fee Table

Expense Narrative [Text Block]

rr_ExpenseNarrativeTextBlock

The following table describes the fees and expenses that may be incurred when you buy and hold shares of the fund.

Shareholder Fees Caption [Text]

rr_ShareholderFeesCaption

Shareholder fees

(fees paid directly from your investment)

rr_ShareholderFeeOther

none

Operating Expenses Caption [Text]

rr_OperatingExpensesCaption

Annual Operating Expenses

(expenses that you pay each year as a % of the value of your investment)

Portfolio Turnover [Heading]

rr_PortfolioTurnoverHeading

Portfolio Turnover

Portfolio Turnover [Text Block]

rr_PortfolioTurnoverTextBlock

The fund pays transaction costs, such as commissions, when it buys and sells securities (or "turns over" its portfolio). A higher portfolio turnover rate may indicate higher transaction costs and may result in higher taxes when fund shares are held in a taxable account. These costs, which are not reflected in annual operating expenses or in the example, affect the fund's performance. During the most recent fiscal year, the fund's portfolio turnover rate was 82% of the average value of its portfolio.

Portfolio Turnover, Rate

rr_PortfolioTurnoverRate

82.00%

Expense Example Narrative [Text Block]

rr_ExpenseExampleNarrativeTextBlock

This example helps compare the cost of investing in the fund with the cost of investing in other funds.

Let's say, hypothetically, that the annual return for shares of the fund is 5% and that your shareholder fees and the annual operating expenses for shares of the fund are exactly as described in the fee table. This example illustrates the effect of fees and expenses, but is not meant to suggest actual or expected fees and expenses or returns, all of which may vary. For every $10,000 you invested, here's how much you would pay in total expenses if you sell all of your shares at the end of each time period indicated:

Expense Example by, Year, Caption [Text]

rr_ExpenseExampleByYearCaption

Sell All Shares

Strategy [Heading]

rr_StrategyHeading

Principal Investment Strategies

Strategy Narrative [Text Block]

rr_StrategyNarrativeTextBlock

• Normally investing primarily in common stocks.

• Normally investing at least 80% of assets in securities of companies principally engaged in offering, using, or developing products, processes, or services that will provide or will benefit significantly from technological advances and improvements.

• Investing in domestic and foreign issuers.

• Using fundamental analysis of factors such as each issuer's financial condition and industry position, as well as market and economic conditions, to select investments.

Strategy Portfolio Concentration [Text]

rr_StrategyPortfolioConcentration

Normally investing at least 80% of assets in securities of companies principally engaged in offering, using, or developing products, processes, or services that will provide or will benefit significantly from technological advances and improvements.

Risk [Heading]

rr_RiskHeading

Principal Investment Risks

Risk Narrative [Text Block]

rr_RiskNarrativeTextBlock

• Stock Market Volatility. Stock markets are volatile and can decline significantly in response to adverse issuer, political, regulatory, market, or economic developments. Different parts of the market, including different market sectors, and different types of securities can react differently to these developments.

• Foreign Exposure. Foreign markets, particularly emerging markets, can be more volatile than the U.S. market due to increased risks of adverse issuer, political, regulatory, market, or economic developments and can perform differently from the U.S. market.

• Technology Industry Concentration. The technology industries can be significantly affected by obsolescence of existing technology, short product cycles, falling prices and profits, competition from new market entrants, and general economic conditions.

• Issuer-Specific Changes. The value of an individual security or particular type of security can be more volatile than, and can perform differently from, the market as a whole. The value of securities of smaller issuers can be more volatile than that of larger issuers.

In addition, the fund is considered non-diversified and can invest a greater portion of assets in securities of a smaller number of individual issuers than a diversified fund. As a result, changes in the market value of a single investment could cause greater fluctuations in share price than would occur in a more diversified fund.

An investment in the fund is not a deposit of a bank and is not insured or guaranteed by the Federal Deposit Insurance Corporation or any other government agency. You could lose money by investing in the fund.

Risk Lose Money [Text]

rr_RiskLoseMoney

You could lose money by investing in the fund.

Risk Nondiversified Status [Text]

rr_RiskNondiversifiedStatus

In addition, the fund is considered non-diversified and can invest a greater portion of assets in securities of a smaller number of individual issuers than a diversified fund. As a result, changes in the market value of a single investment could cause greater fluctuations in share price than would occur in a more diversified fund.

Risk Not Insured Depository Institution [Text]

rr_RiskNotInsuredDepositoryInstitution

An investment in the fund is not a deposit of a bank and is not insured or guaranteed by the Federal Deposit Insurance Corporation or any other government agency.

Bar Chart and Performance Table [Heading]

rr_BarChartAndPerformanceTableHeading

Performance

Performance Narrative [Text Block]

rr_PerformanceNarrativeTextBlock

The following information is intended to help you understand the risks of investing in the fund. The information illustrates the changes in the performance of the fund's shares from year to year and compares the performance of the fund's shares to the performance of a securities market index and an additional index over various periods of time. The indexes have characteristics relevant to the fund's investment strategies. Index descriptions appear in the Additional Index Information section of the prospectus. Past performance (before and after taxes) is not an indication of future performance.

Visit www.fidelity.com for more recent performance information.

Performance Information Illustrates Variability of Returns [Text]

rr_PerformanceInformationIllustratesVariabilityOfReturns

The information illustrates the changes in the performance of the fund's shares from year to year and compares the performance of the fund's shares to the performance of a securities market index and an additional index over various periods of time.

Performance Availability Website Address [Text]

rr_PerformanceAvailabilityWebSiteAddress

www.fidelity.com

Performance Past Does Not Indicate Future [Text]

rr_PerformancePastDoesNotIndicateFuture

Past performance (before and after taxes) is not an indication of future performance.

Bar Chart [Heading]

rr_BarChartHeading

Year-by-Year Returns

Calendar Years

Bar Chart Closing [Text Block]

rr_BarChartClosingTextBlock

During the periods shown in the chart:	Returns	Quarter ended
Highest Quarter Return	32.35%	June 30, 2009
Lowest Quarter Return	-27.69%	December 31, 2008
Year-to-Date Return	17.41%	March 31, 2017

Performance Table Heading

rr_PerformanceTableHeading

Average Annual Returns

Performance Table Uses Highest Federal Rate

rr_PerformanceTableUsesHighestFederalRate

After-tax returns are calculated using the historical highest individual federal marginal income tax rates, but do not reflect the impact of state or local taxes.

Performance Table Not Relevant to Tax Deferred

rr_PerformanceTableNotRelevantToTaxDeferred

The after-tax returns shown are not relevant if you hold your shares in a retirement account or in another tax-deferred arrangement, such as an employee benefit plan (profit sharing, 401(k), or 403(b) plan).

Performance Table Narrative

rr_PerformanceTableNarrativeTextBlock

After-tax returns are calculated using the historical highest individual federal marginal income tax rates, but do not reflect the impact of state or local taxes. Actual after-tax returns may differ depending on your individual circumstances. The after-tax returns shown are not relevant if you hold your shares in a retirement account or in another tax-deferred arrangement, such as an employee benefit plan (profit sharing, 401(k), or 403(b) plan).

For the periods ended December 31, 2016

02.28 Select Portfolios: Group 7 Information Technology Sector Combo PRO-05 | Technology Portfolio | Technology Portfolio-Default

Risk/Return:

rr_RiskReturnAbstract

Management fee

rr_ManagementFeesOverAssets

0.55%

Distribution and/or Service (12b-1) fees

rr_DistributionAndService12b1FeesOverAssets

none

Other expenses

rr_OtherExpensesOverAssets

0.22%

Total annual operating expenses

rr_ExpensesOverAssets

0.77%

1 year

rr_ExpenseExampleYear01

$ 79

3 years

rr_ExpenseExampleYear03

246

5 years

rr_ExpenseExampleYear05

428

10 years

rr_ExpenseExampleYear10

$ 954

2007

rr_AnnualReturn2007

19.78%

2008

rr_AnnualReturn2008

(51.09%)

2009

rr_AnnualReturn2009

90.29%

2010

rr_AnnualReturn2010

26.69%

2011

rr_AnnualReturn2011

(9.56%)

2012

rr_AnnualReturn2012

17.16%

2013

rr_AnnualReturn2013

31.76%

2014

rr_AnnualReturn2014

10.65%

2015

rr_AnnualReturn2015

7.40%

2016

rr_AnnualReturn2016

11.94%

Year to Date Return, Label

rr_YearToDateReturnLabel

Year-to-Date Return

Bar Chart, Year to Date Return, Date

rr_BarChartYearToDateReturnDate

Mar. 31, 2017

Bar Chart, Year to Date Return

rr_BarChartYearToDateReturn

17.41%

Highest Quarterly Return, Label

rr_HighestQuarterlyReturnLabel

Highest Quarter Return

Highest Quarterly Return, Date

rr_BarChartHighestQuarterlyReturnDate

Jun. 30, 2009

Highest Quarterly Return

rr_BarChartHighestQuarterlyReturn

32.35%

Lowest Quarterly Return, Label

rr_LowestQuarterlyReturnLabel

Lowest Quarter Return

Lowest Quarterly Return, Date

rr_BarChartLowestQuarterlyReturnDate

Dec. 31, 2008

Lowest Quarterly Return

rr_BarChartLowestQuarterlyReturn

(27.69%)

02.28 Select Portfolios: Group 7 Information Technology Sector Combo PRO-05 | Technology Portfolio | Return Before Taxes | Technology Portfolio-Default

Risk/Return:

rr_RiskReturnAbstract

Column

rr_AverageAnnualReturnColumnName

Technology Portfolio

Label

rr_AverageAnnualReturnLabel

Return Before Taxes

Past 1 year

rr_AverageAnnualReturnYear01

11.94%

Past 5 years

rr_AverageAnnualReturnYear05

15.48%

Past 10 years

rr_AverageAnnualReturnYear10

10.12%

02.28 Select Portfolios: Group 7 Information Technology Sector Combo PRO-05 | Technology Portfolio | After Taxes on Distributions | Technology Portfolio-Default

Risk/Return:

rr_RiskReturnAbstract

Column

rr_AverageAnnualReturnColumnName

Technology Portfolio

Label

rr_AverageAnnualReturnLabel

Return After Taxes on Distributions

Past 1 year

rr_AverageAnnualReturnYear01

11.53%

Past 5 years

rr_AverageAnnualReturnYear05

13.35%

Past 10 years

rr_AverageAnnualReturnYear10

9.10%

02.28 Select Portfolios: Group 7 Information Technology Sector Combo PRO-05 | Technology Portfolio | After Taxes on Distributions and Sales | Technology Portfolio-Default

Risk/Return:

rr_RiskReturnAbstract

Column

rr_AverageAnnualReturnColumnName

Technology Portfolio

Label

rr_AverageAnnualReturnLabel

Return After Taxes on Distributions and Sale of Fund Shares

Past 1 year

rr_AverageAnnualReturnYear01

7.09%

Past 5 years

rr_AverageAnnualReturnYear05

11.72%

Past 10 years

rr_AverageAnnualReturnYear10

7.99%

02.28 Select Portfolios: Group 7 Information Technology Sector Combo PRO-05 | Technology Portfolio | S&P 500® Index(reflects no deduction for fees, expenses, or taxes)

Risk/Return:

rr_RiskReturnAbstract

Past 1 year

rr_AverageAnnualReturnYear01

11.96%

Past 5 years

rr_AverageAnnualReturnYear05

14.66%

Past 10 years

rr_AverageAnnualReturnYear10

6.95%

02.28 Select Portfolios: Group 7 Information Technology Sector Combo PRO-05 | Technology Portfolio | MSCI U.S. IMI Information Technology 25-50 Index(reflects no deduction for fees, expenses, or taxes)

Risk/Return:

rr_RiskReturnAbstract

Past 1 year

rr_AverageAnnualReturnYear01

13.85%

Past 5 years

rr_AverageAnnualReturnYear05

16.19%

Past 10 years

rr_AverageAnnualReturnYear10

9.93%

XML

02.28 Select Portfolios: Fidelity Advisor Materials Fund - AMCI PRO-03 | Materials Portfolio

Fund Summary

Fund/Class:
Materials Portfolio/Fidelity Advisor® Materials Fund A, M, C, I

Investment Objective

The fund seeks capital appreciation.

Fee Table

The following table describes the fees and expenses that may be incurred when you buy and hold shares of the fund.

You may qualify for sales charge discounts if you and your family invest, or agree to invest in the future, at least $50,000 in the fund or certain other Fidelity^® funds. More information about these and other discounts is available from your investment professional and in the Fund Distribution section beginning on page 26 of the prospectus.

Shareholder fees

(fees paid directly from your investment)

Shareholder Fees {- Materials Portfolio} - 02.28 Select Portfolios: Fidelity Advisor Materials Fund - AMCI PRO-03 - Materials Portfolio	Materials Portfolio-Class A		Materials Portfolio-Class M		Materials Portfolio-Class C		Materials Portfolio - Class I
Maximum sales charge (load) on purchases (as a % of offering price)	5.75%		3.50%		none		none
Maximum contingent deferred sales charge (as a % of the lesser of original purchase price or redemption proceeds)	none	[1]	none	[1]	1.00%	[2]	none

Annual Operating Expenses

(expenses that you pay each year as a % of the value of your investment)

Annual Operating Expenses {- Materials Portfolio} - 02.28 Select Portfolios: Fidelity Advisor Materials Fund - AMCI PRO-03 - Materials Portfolio	Materials Portfolio-Class A	Materials Portfolio-Class M	Materials Portfolio-Class C	Materials Portfolio - Class I
Management fee	0.55%	0.55%	0.55%	0.55%
Distribution and/or Service (12b-1) fees	0.25%	0.50%	1.00%	none
Other expenses	0.28%	0.34%	0.28%	0.24%
Total annual operating expenses	1.08%	1.39%	1.83%	0.79%

This example helps compare the cost of investing in the fund with the cost of investing in other funds.

Let's say, hypothetically, that the annual return for shares of the fund is 5% and that your shareholder fees and the annual operating expenses for shares of the fund are exactly as described in the fee table. This example illustrates the effect of fees and expenses, but is not meant to suggest actual or expected fees and expenses or returns, all of which may vary. For every $10,000 you invested, here's how much you would pay in total expenses if you sell all of your shares at the end of each time period indicated and if you hold your shares:

Sell All Shares

Expense Example {- Materials Portfolio} - 02.28 Select Portfolios: Fidelity Advisor Materials Fund - AMCI PRO-03 - Materials Portfolio - USD ($)	Materials Portfolio-Class A	Materials Portfolio-Class M	Materials Portfolio-Class C	Materials Portfolio - Class I
1 year	$ 679	$ 487	$ 286	$ 81
3 years	899	775	576	252
5 years	1,136	1,084	990	439
10 years	$ 1,816	$ 1,960	$ 2,148	$ 978

Hold Shares

Expense Example, No Redemption {- Materials Portfolio} - 02.28 Select Portfolios: Fidelity Advisor Materials Fund - AMCI PRO-03 - Materials Portfolio - USD ($)	Materials Portfolio-Class A	Materials Portfolio-Class M	Materials Portfolio-Class C	Materials Portfolio - Class I
1 Year	$ 679	$ 487	$ 186	$ 81
3 Years	899	775	576	252
5 Years	1,136	1,084	990	439
10 Years	$ 1,816	$ 1,960	$ 2,148	$ 978

Portfolio Turnover

The fund pays transaction costs, such as commissions, when it buys and sells securities (or "turns over" its portfolio). A higher portfolio turnover rate may indicate higher transaction costs and may result in higher taxes when fund shares are held in a taxable account. These costs, which are not reflected in annual operating expenses or in the example, affect the fund's performance. During the most recent fiscal year, the fund's portfolio turnover rate was 49% of the average value of its portfolio.

Principal Investment Strategies

• Normally investing primarily in common stocks.

• Normally investing at least 80% of assets in securities of companies principally engaged in the manufacture, mining, processing, or distribution of raw materials and intermediate goods.

• Investing in domestic and foreign issuers.

• Using fundamental analysis of factors such as each issuer's financial condition and industry position, as well as market and economic conditions, to select investments.

Principal Investment Risks

• Stock Market Volatility. Stock markets are volatile and can decline significantly in response to adverse issuer, political, regulatory, market, or economic developments. Different parts of the market, including different market sectors, and different types of securities can react differently to these developments.

• Foreign Exposure. Foreign markets can be more volatile than the U.S. market due to increased risks of adverse issuer, political, regulatory, market, or economic developments and can perform differently from the U.S. market.

• Materials Industry Concentration. The materials industries can be significantly affected by the level and volatility of commodity prices, the exchange value of the dollar, import and export controls, worldwide competition, liability for environmental damage, depletion of resources, and mandated expenditures for safety and pollution control.

• Issuer-Specific Changes. The value of an individual security or particular type of security can be more volatile than, and can perform differently from, the market as a whole. The value of securities of smaller issuers can be more volatile than that of larger issuers.

In addition, the fund is considered non-diversified and can invest a greater portion of assets in securities of a smaller number of individual issuers than a diversified fund. As a result, changes in the market value of a single investment could cause greater fluctuations in share price than would occur in a more diversified fund.

An investment in the fund is not a deposit of a bank and is not insured or guaranteed by the Federal Deposit Insurance Corporation or any other government agency. You could lose money by investing in the fund.

Performance

The following information is intended to help you understand the risks of investing in the fund. The information illustrates the changes in the performance of the fund's shares from year to year and compares the performance of the fund's shares to the performance of a securities market index and an additional index over various periods of time. The indexes have characteristics relevant to the fund's investment strategies. Index descriptions appear in the Additional Index Information section of the prospectus. Past performance (before and after taxes) is not an indication of future performance.

Visit institutional.fidelity.com for more recent performance information.

The returns in the bar chart do not reflect any applicable sales charges; if sales charges were reflected, returns would be lower than those shown.

Year-by-Year Returns

Calendar Years

During the periods shown in the chart for Class A:	Returns	Quarter ended
Highest Quarter Return	26.39%	September 30, 2009
Lowest Quarter Return	-30.17%	December 31, 2008
Year-to-Date Return	7.64%	March 31, 2017

Average Annual Returns

Unlike the returns in the bar chart, the returns in the table reflect the maximum applicable sales charges. After-tax returns are calculated using the historical highest individual federal marginal income tax rates, but do not reflect the impact of state or local taxes. After-tax returns for Class A are shown in the table below and after-tax returns for other classes will vary. Actual after-tax returns may differ depending on your individual circumstances. The after-tax returns shown are not relevant if you hold your shares in a retirement account or in another tax-deferred arrangement, such as an employee benefit plan (profit sharing, 401(k), or 403(b) plan).

For the periods ended December 31, 2016

Average Annual Total Returns{- Materials Portfolio} - 02.28 Select Portfolios: Fidelity Advisor Materials Fund - AMCI PRO-03 - Materials Portfolio	Past 1 year	Past 5 years	Past 10 years
Materials Portfolio-Class A | Return Before Taxes	5.29%	6.85%	6.96%
Materials Portfolio-Class A | After Taxes on Distributions	5.08%	6.02%	6.40%
Materials Portfolio-Class A | After Taxes on Distributions and Sales	3.16%	5.38%	5.65%
Materials Portfolio-Class M | Return Before Taxes	7.47%	7.03%	6.88%
Materials Portfolio-Class C | Return Before Taxes	9.88%	7.31%	6.76%
Materials Portfolio - Class I | Return Before Taxes	12.04%	8.43%	7.87%
S&P 500® Index(reflects no deduction for fees, expenses, or taxes)	11.96%	14.66%	6.95%
MSCI U.S. IMI Materials 25-50 Index(reflects no deduction for fees, expenses, or taxes)	21.53%	11.22%	7.01%

02.28 Select Portfolios: Fidelity Advisor Materials Fund - AMCI PRO-03 | Materials Portfolio | Materials Portfolio-Class A

Class A and Class M purchases of $1 million or more will not be subject to a front-end sales charge. Such Class A and Class M purchases may be subject, upon redemption, to a contingent deferred sales charge (CDSC) of 1.00% or 0.25%, respectively.

02.28 Select Portfolios: Fidelity Advisor Materials Fund - AMCI PRO-03 | Materials Portfolio | Materials Portfolio-Class M

Class A and Class M purchases of $1 million or more will not be subject to a front-end sales charge. Such Class A and Class M purchases may be subject, upon redemption, to a contingent deferred sales charge (CDSC) of 1.00% or 0.25%, respectively.

02.28 Select Portfolios: Fidelity Advisor Materials Fund - AMCI PRO-03 | Materials Portfolio | Materials Portfolio-Class C

On Class C shares redeemed less than one year after purchase.

[1] Class A and Class M purchases of $1 million or more will not be subject to a front-end sales charge. Such Class A and Class M purchases may be subject, upon redemption, to a contingent deferred sales charge (CDSC) of 1.00% or 0.25%, respectively.

[2] On Class C shares redeemed less than one year after purchase.

XML

Label

Element

Value

Risk/Return:

rr_RiskReturnAbstract

Registrant Name

dei_EntityRegistrantName

FIDELITY SELECT PORTFOLIOS

Prospectus Date

rr_ProspectusDate

Apr. 29, 2017

02.28 Select Portfolios: Fidelity Advisor Materials Fund - AMCI PRO-03 | Materials Portfolio

Risk/Return:

rr_RiskReturnAbstract

Risk/Return [Heading]

rr_RiskReturnHeading

Fund Summary

Fund/Class:
Materials Portfolio/Fidelity Advisor® Materials Fund A, M, C, I

Objective [Heading]

rr_ObjectiveHeading

Investment Objective

Objective, Primary [Text Block]

rr_ObjectivePrimaryTextBlock

The fund seeks capital appreciation.

Expense [Heading]

rr_ExpenseHeading

Fee Table

Expense Narrative [Text Block]

rr_ExpenseNarrativeTextBlock

The following table describes the fees and expenses that may be incurred when you buy and hold shares of the fund.

You may qualify for sales charge discounts if you and your family invest, or agree to invest in the future, at least $50,000 in the fund or certain other Fidelity^® funds. More information about these and other discounts is available from your investment professional and in the Fund Distribution section beginning on page 26 of the prospectus.

Shareholder Fees Caption [Text]

rr_ShareholderFeesCaption

Shareholder fees

(fees paid directly from your investment)

Operating Expenses Caption [Text]

rr_OperatingExpensesCaption

Annual Operating Expenses

(expenses that you pay each year as a % of the value of your investment)

Portfolio Turnover [Heading]

rr_PortfolioTurnoverHeading

Portfolio Turnover

Portfolio Turnover [Text Block]

rr_PortfolioTurnoverTextBlock

The fund pays transaction costs, such as commissions, when it buys and sells securities (or "turns over" its portfolio). A higher portfolio turnover rate may indicate higher transaction costs and may result in higher taxes when fund shares are held in a taxable account. These costs, which are not reflected in annual operating expenses or in the example, affect the fund's performance. During the most recent fiscal year, the fund's portfolio turnover rate was 49% of the average value of its portfolio.

Portfolio Turnover, Rate

rr_PortfolioTurnoverRate

49.00%

Expense Breakpoint Discounts [Text]

rr_ExpenseBreakpointDiscounts

You may qualify for sales charge discounts if you and your family invest, or agree to invest in the future, at least $50,000 in the fund or certain other Fidelity® funds. More information about these and other discounts is available from your investment professional and in the Fund Distribution section beginning on page 26 of the prospectus.

Expense Breakpoint, Minimum Investment Required [Amount]

rr_ExpenseBreakpointMinimumInvestmentRequiredAmount

$ 50,000

Expense Example Narrative [Text Block]

rr_ExpenseExampleNarrativeTextBlock

This example helps compare the cost of investing in the fund with the cost of investing in other funds.

Let's say, hypothetically, that the annual return for shares of the fund is 5% and that your shareholder fees and the annual operating expenses for shares of the fund are exactly as described in the fee table. This example illustrates the effect of fees and expenses, but is not meant to suggest actual or expected fees and expenses or returns, all of which may vary. For every $10,000 you invested, here's how much you would pay in total expenses if you sell all of your shares at the end of each time period indicated and if you hold your shares:

Expense Example by, Year, Caption [Text]

rr_ExpenseExampleByYearCaption

Sell All Shares

Expense Example, No Redemption, By Year, Caption [Text]

rr_ExpenseExampleNoRedemptionByYearCaption

Hold Shares

Strategy [Heading]

rr_StrategyHeading

Principal Investment Strategies

Strategy Narrative [Text Block]

rr_StrategyNarrativeTextBlock

• Normally investing primarily in common stocks.

• Normally investing at least 80% of assets in securities of companies principally engaged in the manufacture, mining, processing, or distribution of raw materials and intermediate goods.

• Investing in domestic and foreign issuers.

• Using fundamental analysis of factors such as each issuer's financial condition and industry position, as well as market and economic conditions, to select investments.

Strategy Portfolio Concentration [Text]

rr_StrategyPortfolioConcentration

Normally investing at least 80% of assets in securities of companies principally engaged in the manufacture, mining, processing, or distribution of raw materials and intermediate goods.

Risk [Heading]

rr_RiskHeading

Principal Investment Risks

Risk Narrative [Text Block]

rr_RiskNarrativeTextBlock

• Stock Market Volatility. Stock markets are volatile and can decline significantly in response to adverse issuer, political, regulatory, market, or economic developments. Different parts of the market, including different market sectors, and different types of securities can react differently to these developments.

• Foreign Exposure. Foreign markets can be more volatile than the U.S. market due to increased risks of adverse issuer, political, regulatory, market, or economic developments and can perform differently from the U.S. market.

• Materials Industry Concentration. The materials industries can be significantly affected by the level and volatility of commodity prices, the exchange value of the dollar, import and export controls, worldwide competition, liability for environmental damage, depletion of resources, and mandated expenditures for safety and pollution control.

• Issuer-Specific Changes. The value of an individual security or particular type of security can be more volatile than, and can perform differently from, the market as a whole. The value of securities of smaller issuers can be more volatile than that of larger issuers.

In addition, the fund is considered non-diversified and can invest a greater portion of assets in securities of a smaller number of individual issuers than a diversified fund. As a result, changes in the market value of a single investment could cause greater fluctuations in share price than would occur in a more diversified fund.

An investment in the fund is not a deposit of a bank and is not insured or guaranteed by the Federal Deposit Insurance Corporation or any other government agency. You could lose money by investing in the fund.

Risk Lose Money [Text]

rr_RiskLoseMoney

You could lose money by investing in the fund.

Risk Nondiversified Status [Text]

rr_RiskNondiversifiedStatus

In addition, the fund is considered non-diversified and can invest a greater portion of assets in securities of a smaller number of individual issuers than a diversified fund. As a result, changes in the market value of a single investment could cause greater fluctuations in share price than would occur in a more diversified fund.

Risk Not Insured Depository Institution [Text]

rr_RiskNotInsuredDepositoryInstitution

An investment in the fund is not a deposit of a bank and is not insured or guaranteed by the Federal Deposit Insurance Corporation or any other government agency.

Bar Chart and Performance Table [Heading]

rr_BarChartAndPerformanceTableHeading

Performance

Performance Narrative [Text Block]

rr_PerformanceNarrativeTextBlock

The following information is intended to help you understand the risks of investing in the fund. The information illustrates the changes in the performance of the fund's shares from year to year and compares the performance of the fund's shares to the performance of a securities market index and an additional index over various periods of time. The indexes have characteristics relevant to the fund's investment strategies. Index descriptions appear in the Additional Index Information section of the prospectus. Past performance (before and after taxes) is not an indication of future performance.

Visit institutional.fidelity.com for more recent performance information.

Performance Information Illustrates Variability of Returns [Text]

rr_PerformanceInformationIllustratesVariabilityOfReturns

The information illustrates the changes in the performance of the fund's shares from year to year and compares the performance of the fund's shares to the performance of a securities market index and an additional index over various periods of time.

Performance Availability Website Address [Text]

rr_PerformanceAvailabilityWebSiteAddress

institutional.fidelity.com

Performance Past Does Not Indicate Future [Text]

rr_PerformancePastDoesNotIndicateFuture

Past performance (before and after taxes) is not an indication of future performance.

Bar Chart [Heading]

rr_BarChartHeading

Year-by-Year Returns

Calendar Years

Bar Chart Narrative [Text Block]

rr_BarChartNarrativeTextBlock

The returns in the bar chart do not reflect any applicable sales charges; if sales charges were reflected, returns would be lower than those shown.

Bar Chart Does Not Reflect Sales Loads [Text]

rr_BarChartDoesNotReflectSalesLoads

The returns in the bar chart do not reflect any applicable sales charges; if sales charges were reflected, returns would be lower than those shown.

Bar Chart Closing [Text Block]

rr_BarChartClosingTextBlock

During the periods shown in the chart for Class A:	Returns	Quarter ended
Highest Quarter Return	26.39%	September 30, 2009
Lowest Quarter Return	-30.17%	December 31, 2008
Year-to-Date Return	7.64%	March 31, 2017

Performance Table Heading

rr_PerformanceTableHeading

Average Annual Returns

Performance Table Does Reflect Sales Loads

rr_PerformanceTableDoesReflectSalesLoads

Unlike the returns in the bar chart, the returns in the table reflect the maximum applicable sales charges.

Performance Table Uses Highest Federal Rate

rr_PerformanceTableUsesHighestFederalRate

After-tax returns are calculated using the historical highest individual federal marginal income tax rates, but do not reflect the impact of state or local taxes.

Performance Table Not Relevant to Tax Deferred

rr_PerformanceTableNotRelevantToTaxDeferred

The after-tax returns shown are not relevant if you hold your shares in a retirement account or in another tax-deferred arrangement, such as an employee benefit plan (profit sharing, 401(k), or 403(b) plan).

Performance Table One Class of after Tax Shown [Text]

rr_PerformanceTableOneClassOfAfterTaxShown

After-tax returns for Class A are shown in the table below and after-tax returns for other classes will vary.

Performance Table Narrative

rr_PerformanceTableNarrativeTextBlock

Unlike the returns in the bar chart, the returns in the table reflect the maximum applicable sales charges. After-tax returns are calculated using the historical highest individual federal marginal income tax rates, but do not reflect the impact of state or local taxes. After-tax returns for Class A are shown in the table below and after-tax returns for other classes will vary. Actual after-tax returns may differ depending on your individual circumstances. The after-tax returns shown are not relevant if you hold your shares in a retirement account or in another tax-deferred arrangement, such as an employee benefit plan (profit sharing, 401(k), or 403(b) plan).

For the periods ended December 31, 2016

02.28 Select Portfolios: Fidelity Advisor Materials Fund - AMCI PRO-03 | Materials Portfolio | Materials Portfolio-Class A

Risk/Return:

rr_RiskReturnAbstract

Maximum sales charge (load) on purchases (as a % of offering price)

rr_MaximumCumulativeSalesChargeOverOfferingPrice

5.75%

Maximum contingent deferred sales charge (as a % of the lesser of original purchase price or redemption proceeds)

rr_MaximumDeferredSalesChargeOverOther

none

^[1]

Management fee

rr_ManagementFeesOverAssets

0.55%

Distribution and/or Service (12b-1) fees

rr_DistributionAndService12b1FeesOverAssets

0.25%

Other expenses

rr_OtherExpensesOverAssets

0.28%

Total annual operating expenses

rr_ExpensesOverAssets

1.08%

Expenses Deferred Charges [Text Block]

rr_ExpensesDeferredChargesTextBlock

Class A and Class M purchases of $1 million or more will not be subject to a front-end sales charge. Such Class A and Class M purchases may be subject, upon redemption, to a contingent deferred sales charge (CDSC) of 1.00% or 0.25%, respectively.

1 year

rr_ExpenseExampleYear01

$ 679

3 years

rr_ExpenseExampleYear03

899

5 years

rr_ExpenseExampleYear05

1,136

10 years

rr_ExpenseExampleYear10

1,816

1 Year

rr_ExpenseExampleNoRedemptionYear01

679

3 Years

rr_ExpenseExampleNoRedemptionYear03

899

5 Years

rr_ExpenseExampleNoRedemptionYear05

1,136

10 Years

rr_ExpenseExampleNoRedemptionYear10

$ 1,816

2007

rr_AnnualReturn2007

29.21%

2008

rr_AnnualReturn2008

(47.71%)

2009

rr_AnnualReturn2009

78.17%

2010

rr_AnnualReturn2010

27.73%

2011

rr_AnnualReturn2011

(8.46%)

2012

rr_AnnualReturn2012

19.83%

2013

rr_AnnualReturn2013

21.56%

2014

rr_AnnualReturn2014

(0.32%)

2015

rr_AnnualReturn2015

(8.91%)

2016

rr_AnnualReturn2016

11.71%

Year to Date Return, Label

rr_YearToDateReturnLabel

Year-to-Date Return

Bar Chart, Year to Date Return, Date

rr_BarChartYearToDateReturnDate

Mar. 31, 2017

Bar Chart, Year to Date Return

rr_BarChartYearToDateReturn

7.64%

Highest Quarterly Return, Label

rr_HighestQuarterlyReturnLabel

Highest Quarter Return

Highest Quarterly Return, Date

rr_BarChartHighestQuarterlyReturnDate

Sep. 30, 2009

Highest Quarterly Return

rr_BarChartHighestQuarterlyReturn

26.39%

Lowest Quarterly Return, Label

rr_LowestQuarterlyReturnLabel

Lowest Quarter Return

Lowest Quarterly Return, Date

rr_BarChartLowestQuarterlyReturnDate

Dec. 31, 2008

Lowest Quarterly Return

rr_BarChartLowestQuarterlyReturn

(30.17%)

02.28 Select Portfolios: Fidelity Advisor Materials Fund - AMCI PRO-03 | Materials Portfolio | Materials Portfolio-Class M

Risk/Return:

rr_RiskReturnAbstract

Maximum sales charge (load) on purchases (as a % of offering price)

rr_MaximumCumulativeSalesChargeOverOfferingPrice

3.50%

Maximum contingent deferred sales charge (as a % of the lesser of original purchase price or redemption proceeds)

rr_MaximumDeferredSalesChargeOverOther

none

^[1]

Management fee

rr_ManagementFeesOverAssets

0.55%

Distribution and/or Service (12b-1) fees

rr_DistributionAndService12b1FeesOverAssets

0.50%

Other expenses

rr_OtherExpensesOverAssets

0.34%

Total annual operating expenses

rr_ExpensesOverAssets

1.39%

Expenses Deferred Charges [Text Block]

rr_ExpensesDeferredChargesTextBlock

Class A and Class M purchases of $1 million or more will not be subject to a front-end sales charge. Such Class A and Class M purchases may be subject, upon redemption, to a contingent deferred sales charge (CDSC) of 1.00% or 0.25%, respectively.

1 year

rr_ExpenseExampleYear01

$ 487

3 years

rr_ExpenseExampleYear03

775

5 years

rr_ExpenseExampleYear05

1,084

10 years

rr_ExpenseExampleYear10

1,960

1 Year

rr_ExpenseExampleNoRedemptionYear01

487

3 Years

rr_ExpenseExampleNoRedemptionYear03

775

5 Years

rr_ExpenseExampleNoRedemptionYear05

1,084

10 Years

rr_ExpenseExampleNoRedemptionYear10

$ 1,960

02.28 Select Portfolios: Fidelity Advisor Materials Fund - AMCI PRO-03 | Materials Portfolio | Materials Portfolio-Class C

Risk/Return:

rr_RiskReturnAbstract

Maximum sales charge (load) on purchases (as a % of offering price)

rr_MaximumCumulativeSalesChargeOverOfferingPrice

none

Maximum contingent deferred sales charge (as a % of the lesser of original purchase price or redemption proceeds)

rr_MaximumDeferredSalesChargeOverOther

1.00%

^[2]

Management fee

rr_ManagementFeesOverAssets

0.55%

Distribution and/or Service (12b-1) fees

rr_DistributionAndService12b1FeesOverAssets

1.00%

Other expenses

rr_OtherExpensesOverAssets

0.28%

Total annual operating expenses

rr_ExpensesOverAssets

1.83%

Expenses Deferred Charges [Text Block]

rr_ExpensesDeferredChargesTextBlock

On Class C shares redeemed less than one year after purchase.

1 year

rr_ExpenseExampleYear01

$ 286

3 years

rr_ExpenseExampleYear03

576

5 years

rr_ExpenseExampleYear05

990

10 years

rr_ExpenseExampleYear10

2,148

1 Year

rr_ExpenseExampleNoRedemptionYear01

186

3 Years

rr_ExpenseExampleNoRedemptionYear03

576

5 Years

rr_ExpenseExampleNoRedemptionYear05

990

10 Years

rr_ExpenseExampleNoRedemptionYear10

$ 2,148

02.28 Select Portfolios: Fidelity Advisor Materials Fund - AMCI PRO-03 | Materials Portfolio | Materials Portfolio - Class I

Risk/Return:

rr_RiskReturnAbstract

Maximum sales charge (load) on purchases (as a % of offering price)

rr_MaximumCumulativeSalesChargeOverOfferingPrice

none

Maximum contingent deferred sales charge (as a % of the lesser of original purchase price or redemption proceeds)

rr_MaximumDeferredSalesChargeOverOther

none

Management fee

rr_ManagementFeesOverAssets

0.55%

Distribution and/or Service (12b-1) fees

rr_DistributionAndService12b1FeesOverAssets

none

Other expenses

rr_OtherExpensesOverAssets

0.24%

Total annual operating expenses

rr_ExpensesOverAssets

0.79%

1 year

rr_ExpenseExampleYear01

$ 81

3 years

rr_ExpenseExampleYear03

252

5 years

rr_ExpenseExampleYear05

439

10 years

rr_ExpenseExampleYear10

978

1 Year

rr_ExpenseExampleNoRedemptionYear01

81

3 Years

rr_ExpenseExampleNoRedemptionYear03

252

5 Years

rr_ExpenseExampleNoRedemptionYear05

439

10 Years

rr_ExpenseExampleNoRedemptionYear10

$ 978

02.28 Select Portfolios: Fidelity Advisor Materials Fund - AMCI PRO-03 | Materials Portfolio | Return Before Taxes | Materials Portfolio-Class A

Risk/Return:

rr_RiskReturnAbstract

Column

rr_AverageAnnualReturnColumnName

Materials Portfolio

Label

rr_AverageAnnualReturnLabel

Class A - Return Before Taxes

Past 1 year

rr_AverageAnnualReturnYear01

5.29%

Past 5 years

rr_AverageAnnualReturnYear05

6.85%

Past 10 years

rr_AverageAnnualReturnYear10

6.96%

02.28 Select Portfolios: Fidelity Advisor Materials Fund - AMCI PRO-03 | Materials Portfolio | Return Before Taxes | Materials Portfolio-Class M

Risk/Return:

rr_RiskReturnAbstract

Column

rr_AverageAnnualReturnColumnName

Materials Portfolio

Label

rr_AverageAnnualReturnLabel

Class M - Return Before Taxes

Past 1 year

rr_AverageAnnualReturnYear01

7.47%

Past 5 years

rr_AverageAnnualReturnYear05

7.03%

Past 10 years

rr_AverageAnnualReturnYear10

6.88%

02.28 Select Portfolios: Fidelity Advisor Materials Fund - AMCI PRO-03 | Materials Portfolio | Return Before Taxes | Materials Portfolio-Class C

Risk/Return:

rr_RiskReturnAbstract

Column

rr_AverageAnnualReturnColumnName

Materials Portfolio

Label

rr_AverageAnnualReturnLabel

Class C - Return Before Taxes

Past 1 year

rr_AverageAnnualReturnYear01

9.88%

Past 5 years

rr_AverageAnnualReturnYear05

7.31%

Past 10 years

rr_AverageAnnualReturnYear10

6.76%

02.28 Select Portfolios: Fidelity Advisor Materials Fund - AMCI PRO-03 | Materials Portfolio | Return Before Taxes | Materials Portfolio - Class I

Risk/Return:

rr_RiskReturnAbstract

Column

rr_AverageAnnualReturnColumnName

Materials Portfolio

Label

rr_AverageAnnualReturnLabel

Class I - Return Before Taxes

Past 1 year

rr_AverageAnnualReturnYear01

12.04%

Past 5 years

rr_AverageAnnualReturnYear05

8.43%

Past 10 years

rr_AverageAnnualReturnYear10

7.87%

02.28 Select Portfolios: Fidelity Advisor Materials Fund - AMCI PRO-03 | Materials Portfolio | After Taxes on Distributions | Materials Portfolio-Class A

Risk/Return:

rr_RiskReturnAbstract

Column

rr_AverageAnnualReturnColumnName

Materials Portfolio

Label

rr_AverageAnnualReturnLabel

Return After Taxes on Distributions

Past 1 year

rr_AverageAnnualReturnYear01

5.08%

Past 5 years

rr_AverageAnnualReturnYear05

6.02%

Past 10 years

rr_AverageAnnualReturnYear10

6.40%

02.28 Select Portfolios: Fidelity Advisor Materials Fund - AMCI PRO-03 | Materials Portfolio | After Taxes on Distributions and Sales | Materials Portfolio-Class A

Risk/Return:

rr_RiskReturnAbstract

Column

rr_AverageAnnualReturnColumnName

Materials Portfolio

Label

rr_AverageAnnualReturnLabel

Return After Taxes on Distributions and Sale of Fund Shares

Past 1 year

rr_AverageAnnualReturnYear01

3.16%

Past 5 years

rr_AverageAnnualReturnYear05

5.38%

Past 10 years

rr_AverageAnnualReturnYear10

5.65%

02.28 Select Portfolios: Fidelity Advisor Materials Fund - AMCI PRO-03 | Materials Portfolio | S&P 500® Index(reflects no deduction for fees, expenses, or taxes)

Risk/Return:

rr_RiskReturnAbstract

Past 1 year

rr_AverageAnnualReturnYear01

11.96%

Past 5 years

rr_AverageAnnualReturnYear05

14.66%

Past 10 years

rr_AverageAnnualReturnYear10

6.95%

02.28 Select Portfolios: Fidelity Advisor Materials Fund - AMCI PRO-03 | Materials Portfolio | MSCI U.S. IMI Materials 25-50 Index(reflects no deduction for fees, expenses, or taxes)

Risk/Return:

rr_RiskReturnAbstract

Past 1 year

rr_AverageAnnualReturnYear01

21.53%

Past 5 years

rr_AverageAnnualReturnYear05

11.22%

Past 10 years

rr_AverageAnnualReturnYear10

7.01%

[1] Class A and Class M purchases of $1 million or more will not be subject to a front-end sales charge. Such Class A and Class M purchases may be subject, upon redemption, to a contingent deferred sales charge (CDSC) of 1.00% or 0.25%, respectively.

[2] On Class C shares redeemed less than one year after purchase.

XML

02.28 Select Portfolios: Fidelity Advisor Consumer Staples Fund - AMCI PRO-03 | Consumer Staples Portfolio

Fund Summary

Fund/Class:
Consumer Staples Portfolio/Fidelity Advisor® Consumer Staples Fund A, M, C, I

Investment Objective

The fund seeks capital appreciation.

Fee Table

The following table describes the fees and expenses that may be incurred when you buy and hold shares of the fund.

You may qualify for sales charge discounts if you and your family invest, or agree to invest in the future, at least $50,000 in the fund or certain other Fidelity^® funds. More information about these and other discounts is available from your investment professional and in the Fund Distribution section beginning on page 26 of the prospectus.

Shareholder fees

(fees paid directly from your investment)

Shareholder Fees {- Consumer Staples Portfolio} - 02.28 Select Portfolios: Fidelity Advisor Consumer Staples Fund - AMCI PRO-03 - Consumer Staples Portfolio	Consumer Staples Portfolio-Class A		Consumer Staples Portfolio-Class M		Consumer Staples Portfolio-Class C		Consumer Staples Portfolio - Class I
Maximum sales charge (load) on purchases (as a % of offering price)	5.75%		3.50%		none		none
Maximum contingent deferred sales charge (as a % of the lesser of original purchase price or redemption proceeds)	none	[1]	none	[1]	1.00%	[2]	none

Annual Operating Expenses

(expenses that you pay each year as a % of the value of your investment)

Annual Operating Expenses {- Consumer Staples Portfolio} - 02.28 Select Portfolios: Fidelity Advisor Consumer Staples Fund - AMCI PRO-03 - Consumer Staples Portfolio	Consumer Staples Portfolio-Class A	Consumer Staples Portfolio-Class M	Consumer Staples Portfolio-Class C	Consumer Staples Portfolio - Class I
Management fee	0.55%	0.55%	0.55%	0.55%
Distribution and/or Service (12b-1) fees	0.25%	0.50%	1.00%	none
Other expenses	0.24%	0.27%	0.25%	0.23%
Total annual operating expenses	1.04%	1.32%	1.80%	0.78%

This example helps compare the cost of investing in the fund with the cost of investing in other funds.

Let's say, hypothetically, that the annual return for shares of the fund is 5% and that your shareholder fees and the annual operating expenses for shares of the fund are exactly as described in the fee table. This example illustrates the effect of fees and expenses, but is not meant to suggest actual or expected fees and expenses or returns, all of which may vary. For every $10,000 you invested, here's how much you would pay in total expenses if you sell all of your shares at the end of each time period indicated and if you hold your shares:

Sell All Shares

Expense Example {- Consumer Staples Portfolio} - 02.28 Select Portfolios: Fidelity Advisor Consumer Staples Fund - AMCI PRO-03 - Consumer Staples Portfolio - USD ($)	Consumer Staples Portfolio-Class A	Consumer Staples Portfolio-Class M	Consumer Staples Portfolio-Class C	Consumer Staples Portfolio - Class I
1 year	$ 675	$ 480	$ 283	$ 80
3 years	887	754	566	249
5 years	1,116	1,048	975	433
10 years	$ 1,773	$ 1,885	$ 2,116	$ 966

Hold Shares

Expense Example, No Redemption {- Consumer Staples Portfolio} - 02.28 Select Portfolios: Fidelity Advisor Consumer Staples Fund - AMCI PRO-03 - Consumer Staples Portfolio - USD ($)	Consumer Staples Portfolio-Class A	Consumer Staples Portfolio-Class M	Consumer Staples Portfolio-Class C	Consumer Staples Portfolio - Class I
1 Year	$ 675	$ 480	$ 183	$ 80
3 Years	887	754	566	249
5 Years	1,116	1,048	975	433
10 Years	$ 1,773	$ 1,885	$ 2,116	$ 966

Portfolio Turnover

The fund pays transaction costs, such as commissions, when it buys and sells securities (or "turns over" its portfolio). A higher portfolio turnover rate may indicate higher transaction costs and may result in higher taxes when fund shares are held in a taxable account. These costs, which are not reflected in annual operating expenses or in the example, affect the fund's performance. During the most recent fiscal year, the fund's portfolio turnover rate was 56% of the average value of its portfolio.

Principal Investment Strategies

• Normally investing primarily in common stocks.

• Normally investing at least 80% of assets in securities of companies principally engaged in the manufacture, sale, or distribution of consumer staples.

• Investing in domestic and foreign issuers.

• Using fundamental analysis of factors such as each issuer's financial condition and industry position, as well as market and economic conditions, to select investments.

Principal Investment Risks

• Stock Market Volatility. Stock markets are volatile and can decline significantly in response to adverse issuer, political, regulatory, market, or economic developments. Different parts of the market, including different market sectors, and different types of securities can react differently to these developments.

• Foreign Exposure. Foreign markets can be more volatile than the U.S. market due to increased risks of adverse issuer, political, regulatory, market, or economic developments and can perform differently from the U.S. market.

• Consumer Staples Industry Concentration. The consumer staples industries can be significantly affected by demographics and product trends, competitive pricing, food fads, marketing campaigns, environmental factors, government regulation, the performance of the overall economy, interest rates, consumer confidence, and the cost of commodities.

• Issuer-Specific Changes. The value of an individual security or particular type of security can be more volatile than, and can perform differently from, the market as a whole. The value of securities of smaller issuers can be more volatile than that of larger issuers.

In addition, the fund is considered non-diversified and can invest a greater portion of assets in securities of a smaller number of individual issuers than a diversified fund. As a result, changes in the market value of a single investment could cause greater fluctuations in share price than would occur in a more diversified fund.

An investment in the fund is not a deposit of a bank and is not insured or guaranteed by the Federal Deposit Insurance Corporation or any other government agency. You could lose money by investing in the fund.

Performance

The following information is intended to help you understand the risks of investing in the fund. The information illustrates the changes in the performance of the fund's shares from year to year and compares the performance of the fund's shares to the performance of a securities market index and an additional index over various periods of time. The indexes have characteristics relevant to the fund's investment strategies. Index descriptions appear in the Additional Index Information section of the prospectus. Past performance (before and after taxes) is not an indication of future performance.

Visit institutional.fidelity.com for more recent performance information.

The returns in the bar chart do not reflect any applicable sales charges; if sales charges were reflected, returns would be lower than those shown.

Year-by-Year Returns

Calendar Years

During the periods shown in the chart for Class A:	Returns	Quarter ended
Highest Quarter Return	14.42%	June 30, 2009
Lowest Quarter Return	-13.00%	December 31, 2008
Year-to-Date Return	9.20%	March 31, 2017

Average Annual Returns

Unlike the returns in the bar chart, the returns in the table reflect the maximum applicable sales charges. After-tax returns are calculated using the historical highest individual federal marginal income tax rates, but do not reflect the impact of state or local taxes. After-tax returns for Class A are shown in the table below and after-tax returns for other classes will vary. Actual after-tax returns may differ depending on your individual circumstances. The after-tax returns shown are not relevant if you hold your shares in a retirement account or in another tax-deferred arrangement, such as an employee benefit plan (profit sharing, 401(k), or 403(b) plan). Return After Taxes on Distributions and Sale of Fund Shares may be higher than other returns for the same period due to a tax benefit of realizing a capital loss upon the sale of fund shares.

For the periods ended December 31, 2016

Average Annual Total Returns{- Consumer Staples Portfolio} - 02.28 Select Portfolios: Fidelity Advisor Consumer Staples Fund - AMCI PRO-03 - Consumer Staples Portfolio	Past 1 year	Past 5 years	Past 10 years
Consumer Staples Portfolio-Class A | Return Before Taxes	(3.13%)	9.51%	8.34%
Consumer Staples Portfolio-Class A | After Taxes on Distributions	(4.12%)	8.09%	7.40%
Consumer Staples Portfolio-Class A | After Taxes on Distributions and Sales	(0.95%)	7.46%	6.74%
Consumer Staples Portfolio-Class M | Return Before Taxes	(1.09%)	9.72%	8.28%
Consumer Staples Portfolio-Class C | Return Before Taxes	1.02%	9.98%	8.16%
Consumer Staples Portfolio - Class I | Return Before Taxes	3.04%	11.09%	9.25%
S&P 500® Index(reflects no deduction for fees, expenses, or taxes)	11.96%	14.66%	6.95%
MSCI U.S. IMI Consumer Staples 25-50 Index(reflects no deduction for fees, expenses, or taxes)	6.39%	13.28%	10.36%

02.28 Select Portfolios: Fidelity Advisor Consumer Staples Fund - AMCI PRO-03 | Consumer Staples Portfolio | Consumer Staples Portfolio-Class A

Class A and Class M purchases of $1 million or more will not be subject to a front-end sales charge. Such Class A and Class M purchases may be subject, upon redemption, to a contingent deferred sales charge (CDSC) of 1.00% or 0.25%, respectively.

02.28 Select Portfolios: Fidelity Advisor Consumer Staples Fund - AMCI PRO-03 | Consumer Staples Portfolio | Consumer Staples Portfolio-Class M

Class A and Class M purchases of $1 million or more will not be subject to a front-end sales charge. Such Class A and Class M purchases may be subject, upon redemption, to a contingent deferred sales charge (CDSC) of 1.00% or 0.25%, respectively.

02.28 Select Portfolios: Fidelity Advisor Consumer Staples Fund - AMCI PRO-03 | Consumer Staples Portfolio | Consumer Staples Portfolio-Class C

On Class C shares redeemed less than one year after purchase.

[1] Class A and Class M purchases of $1 million or more will not be subject to a front-end sales charge. Such Class A and Class M purchases may be subject, upon redemption, to a contingent deferred sales charge (CDSC) of 1.00% or 0.25%, respectively.

[2] On Class C shares redeemed less than one year after purchase.

XML

Label

Element

Value

Risk/Return:

rr_RiskReturnAbstract

Registrant Name

dei_EntityRegistrantName

FIDELITY SELECT PORTFOLIOS

Prospectus Date

rr_ProspectusDate

Apr. 29, 2017

02.28 Select Portfolios: Fidelity Advisor Consumer Staples Fund - AMCI PRO-03 | Consumer Staples Portfolio

Risk/Return:

rr_RiskReturnAbstract

Risk/Return [Heading]

rr_RiskReturnHeading

Fund Summary

Fund/Class:
Consumer Staples Portfolio/Fidelity Advisor® Consumer Staples Fund A, M, C, I

Objective [Heading]

rr_ObjectiveHeading

Investment Objective

Objective, Primary [Text Block]

rr_ObjectivePrimaryTextBlock

The fund seeks capital appreciation.

Expense [Heading]

rr_ExpenseHeading

Fee Table

Expense Narrative [Text Block]

rr_ExpenseNarrativeTextBlock

The following table describes the fees and expenses that may be incurred when you buy and hold shares of the fund.

You may qualify for sales charge discounts if you and your family invest, or agree to invest in the future, at least $50,000 in the fund or certain other Fidelity^® funds. More information about these and other discounts is available from your investment professional and in the Fund Distribution section beginning on page 26 of the prospectus.

Shareholder Fees Caption [Text]

rr_ShareholderFeesCaption

Shareholder fees

(fees paid directly from your investment)

Operating Expenses Caption [Text]

rr_OperatingExpensesCaption

Annual Operating Expenses

(expenses that you pay each year as a % of the value of your investment)

Portfolio Turnover [Heading]

rr_PortfolioTurnoverHeading

Portfolio Turnover

Portfolio Turnover [Text Block]

rr_PortfolioTurnoverTextBlock

The fund pays transaction costs, such as commissions, when it buys and sells securities (or "turns over" its portfolio). A higher portfolio turnover rate may indicate higher transaction costs and may result in higher taxes when fund shares are held in a taxable account. These costs, which are not reflected in annual operating expenses or in the example, affect the fund's performance. During the most recent fiscal year, the fund's portfolio turnover rate was 56% of the average value of its portfolio.

Portfolio Turnover, Rate

rr_PortfolioTurnoverRate

56.00%

Expense Breakpoint Discounts [Text]

rr_ExpenseBreakpointDiscounts

You may qualify for sales charge discounts if you and your family invest, or agree to invest in the future, at least $50,000 in the fund or certain other Fidelity® funds. More information about these and other discounts is available from your investment professional and in the Fund Distribution section beginning on page 26 of the prospectus.

Expense Breakpoint, Minimum Investment Required [Amount]

rr_ExpenseBreakpointMinimumInvestmentRequiredAmount

$ 50,000

Expense Example Narrative [Text Block]

rr_ExpenseExampleNarrativeTextBlock

This example helps compare the cost of investing in the fund with the cost of investing in other funds.

Let's say, hypothetically, that the annual return for shares of the fund is 5% and that your shareholder fees and the annual operating expenses for shares of the fund are exactly as described in the fee table. This example illustrates the effect of fees and expenses, but is not meant to suggest actual or expected fees and expenses or returns, all of which may vary. For every $10,000 you invested, here's how much you would pay in total expenses if you sell all of your shares at the end of each time period indicated and if you hold your shares:

Expense Example by, Year, Caption [Text]

rr_ExpenseExampleByYearCaption

Sell All Shares

Expense Example, No Redemption, By Year, Caption [Text]

rr_ExpenseExampleNoRedemptionByYearCaption

Hold Shares

Strategy [Heading]

rr_StrategyHeading

Principal Investment Strategies

Strategy Narrative [Text Block]

rr_StrategyNarrativeTextBlock

• Normally investing primarily in common stocks.

• Normally investing at least 80% of assets in securities of companies principally engaged in the manufacture, sale, or distribution of consumer staples.

• Investing in domestic and foreign issuers.

• Using fundamental analysis of factors such as each issuer's financial condition and industry position, as well as market and economic conditions, to select investments.

Strategy Portfolio Concentration [Text]

rr_StrategyPortfolioConcentration

Normally investing at least 80% of assets in securities of companies principally engaged in the manufacture, sale, or distribution of consumer staples.

Risk [Heading]

rr_RiskHeading

Principal Investment Risks

Risk Narrative [Text Block]

rr_RiskNarrativeTextBlock

• Stock Market Volatility. Stock markets are volatile and can decline significantly in response to adverse issuer, political, regulatory, market, or economic developments. Different parts of the market, including different market sectors, and different types of securities can react differently to these developments.

• Foreign Exposure. Foreign markets can be more volatile than the U.S. market due to increased risks of adverse issuer, political, regulatory, market, or economic developments and can perform differently from the U.S. market.

• Consumer Staples Industry Concentration. The consumer staples industries can be significantly affected by demographics and product trends, competitive pricing, food fads, marketing campaigns, environmental factors, government regulation, the performance of the overall economy, interest rates, consumer confidence, and the cost of commodities.

• Issuer-Specific Changes. The value of an individual security or particular type of security can be more volatile than, and can perform differently from, the market as a whole. The value of securities of smaller issuers can be more volatile than that of larger issuers.

In addition, the fund is considered non-diversified and can invest a greater portion of assets in securities of a smaller number of individual issuers than a diversified fund. As a result, changes in the market value of a single investment could cause greater fluctuations in share price than would occur in a more diversified fund.

An investment in the fund is not a deposit of a bank and is not insured or guaranteed by the Federal Deposit Insurance Corporation or any other government agency. You could lose money by investing in the fund.

Risk Lose Money [Text]

rr_RiskLoseMoney

You could lose money by investing in the fund.

Risk Nondiversified Status [Text]

rr_RiskNondiversifiedStatus

In addition, the fund is considered non-diversified and can invest a greater portion of assets in securities of a smaller number of individual issuers than a diversified fund. As a result, changes in the market value of a single investment could cause greater fluctuations in share price than would occur in a more diversified fund.

Risk Not Insured Depository Institution [Text]

rr_RiskNotInsuredDepositoryInstitution

An investment in the fund is not a deposit of a bank and is not insured or guaranteed by the Federal Deposit Insurance Corporation or any other government agency.

Bar Chart and Performance Table [Heading]

rr_BarChartAndPerformanceTableHeading

Performance

Performance Narrative [Text Block]

rr_PerformanceNarrativeTextBlock

The following information is intended to help you understand the risks of investing in the fund. The information illustrates the changes in the performance of the fund's shares from year to year and compares the performance of the fund's shares to the performance of a securities market index and an additional index over various periods of time. The indexes have characteristics relevant to the fund's investment strategies. Index descriptions appear in the Additional Index Information section of the prospectus. Past performance (before and after taxes) is not an indication of future performance.

Visit institutional.fidelity.com for more recent performance information.

Performance Information Illustrates Variability of Returns [Text]

rr_PerformanceInformationIllustratesVariabilityOfReturns

The information illustrates the changes in the performance of the fund's shares from year to year and compares the performance of the fund's shares to the performance of a securities market index and an additional index over various periods of time.

Performance Availability Website Address [Text]

rr_PerformanceAvailabilityWebSiteAddress

institutional.fidelity.com

Performance Past Does Not Indicate Future [Text]

rr_PerformancePastDoesNotIndicateFuture

Past performance (before and after taxes) is not an indication of future performance.

Bar Chart [Heading]

rr_BarChartHeading

Year-by-Year Returns

Calendar Years

Bar Chart Narrative [Text Block]

rr_BarChartNarrativeTextBlock

The returns in the bar chart do not reflect any applicable sales charges; if sales charges were reflected, returns would be lower than those shown.

Bar Chart Does Not Reflect Sales Loads [Text]

rr_BarChartDoesNotReflectSalesLoads

The returns in the bar chart do not reflect any applicable sales charges; if sales charges were reflected, returns would be lower than those shown.

Bar Chart Closing [Text Block]

rr_BarChartClosingTextBlock

During the periods shown in the chart for Class A:	Returns	Quarter ended
Highest Quarter Return	14.42%	June 30, 2009
Lowest Quarter Return	-13.00%	December 31, 2008
Year-to-Date Return	9.20%	March 31, 2017

Performance Table Heading

rr_PerformanceTableHeading

Average Annual Returns

Performance Table Does Reflect Sales Loads

rr_PerformanceTableDoesReflectSalesLoads

Unlike the returns in the bar chart, the returns in the table reflect the maximum applicable sales charges.

Performance Table Uses Highest Federal Rate

rr_PerformanceTableUsesHighestFederalRate

After-tax returns are calculated using the historical highest individual federal marginal income tax rates, but do not reflect the impact of state or local taxes.

Performance Table Not Relevant to Tax Deferred

rr_PerformanceTableNotRelevantToTaxDeferred

The after-tax returns shown are not relevant if you hold your shares in a retirement account or in another tax-deferred arrangement, such as an employee benefit plan (profit sharing, 401(k), or 403(b) plan).

Performance Table One Class of after Tax Shown [Text]

rr_PerformanceTableOneClassOfAfterTaxShown

After-tax returns for Class A are shown in the table below and after-tax returns for other classes will vary.

Performance Table Explanation after Tax Higher

rr_PerformanceTableExplanationAfterTaxHigher

Return After Taxes on Distributions and Sale of Fund Shares may be higher than other returns for the same period due to a tax benefit of realizing a capital loss upon the sale of fund shares.

Performance Table Narrative

rr_PerformanceTableNarrativeTextBlock

Unlike the returns in the bar chart, the returns in the table reflect the maximum applicable sales charges. After-tax returns are calculated using the historical highest individual federal marginal income tax rates, but do not reflect the impact of state or local taxes. After-tax returns for Class A are shown in the table below and after-tax returns for other classes will vary. Actual after-tax returns may differ depending on your individual circumstances. The after-tax returns shown are not relevant if you hold your shares in a retirement account or in another tax-deferred arrangement, such as an employee benefit plan (profit sharing, 401(k), or 403(b) plan). Return After Taxes on Distributions and Sale of Fund Shares may be higher than other returns for the same period due to a tax benefit of realizing a capital loss upon the sale of fund shares.

For the periods ended December 31, 2016

02.28 Select Portfolios: Fidelity Advisor Consumer Staples Fund - AMCI PRO-03 | Consumer Staples Portfolio | Consumer Staples Portfolio-Class A

Risk/Return:

rr_RiskReturnAbstract

Maximum sales charge (load) on purchases (as a % of offering price)

rr_MaximumCumulativeSalesChargeOverOfferingPrice

5.75%

Maximum contingent deferred sales charge (as a % of the lesser of original purchase price or redemption proceeds)

rr_MaximumDeferredSalesChargeOverOther

none

^[1]

Management fee

rr_ManagementFeesOverAssets

0.55%

Distribution and/or Service (12b-1) fees

rr_DistributionAndService12b1FeesOverAssets

0.25%

Other expenses

rr_OtherExpensesOverAssets

0.24%

Total annual operating expenses

rr_ExpensesOverAssets

1.04%

Expenses Deferred Charges [Text Block]

rr_ExpensesDeferredChargesTextBlock

Class A and Class M purchases of $1 million or more will not be subject to a front-end sales charge. Such Class A and Class M purchases may be subject, upon redemption, to a contingent deferred sales charge (CDSC) of 1.00% or 0.25%, respectively.

1 year

rr_ExpenseExampleYear01

$ 675

3 years

rr_ExpenseExampleYear03

887

5 years

rr_ExpenseExampleYear05

1,116

10 years

rr_ExpenseExampleYear10

1,773

1 Year

rr_ExpenseExampleNoRedemptionYear01

675

3 Years

rr_ExpenseExampleNoRedemptionYear03

887

5 Years

rr_ExpenseExampleNoRedemptionYear05

1,116

10 Years

rr_ExpenseExampleNoRedemptionYear10

$ 1,773

2007

rr_AnnualReturn2007

21.26%

2008

rr_AnnualReturn2008

(22.51%)

2009

rr_AnnualReturn2009

20.66%

2010

rr_AnnualReturn2010

14.92%

2011

rr_AnnualReturn2011

8.56%

2012

rr_AnnualReturn2012

15.06%

2013

rr_AnnualReturn2013

21.31%

2014

rr_AnnualReturn2014

14.59%

2015

rr_AnnualReturn2015

1.63%

2016

rr_AnnualReturn2016

2.78%

Year to Date Return, Label

rr_YearToDateReturnLabel

Year-to-Date Return

Bar Chart, Year to Date Return, Date

rr_BarChartYearToDateReturnDate

Mar. 31, 2017

Bar Chart, Year to Date Return

rr_BarChartYearToDateReturn

9.20%

Highest Quarterly Return, Label

rr_HighestQuarterlyReturnLabel

Highest Quarter Return

Highest Quarterly Return, Date

rr_BarChartHighestQuarterlyReturnDate

Jun. 30, 2009

Highest Quarterly Return

rr_BarChartHighestQuarterlyReturn

14.42%

Lowest Quarterly Return, Label

rr_LowestQuarterlyReturnLabel

Lowest Quarter Return

Lowest Quarterly Return, Date

rr_BarChartLowestQuarterlyReturnDate

Dec. 31, 2008

Lowest Quarterly Return

rr_BarChartLowestQuarterlyReturn

(13.00%)

02.28 Select Portfolios: Fidelity Advisor Consumer Staples Fund - AMCI PRO-03 | Consumer Staples Portfolio | Consumer Staples Portfolio-Class M

Risk/Return:

rr_RiskReturnAbstract

Maximum sales charge (load) on purchases (as a % of offering price)

rr_MaximumCumulativeSalesChargeOverOfferingPrice

3.50%

Maximum contingent deferred sales charge (as a % of the lesser of original purchase price or redemption proceeds)

rr_MaximumDeferredSalesChargeOverOther

none

^[1]

Management fee

rr_ManagementFeesOverAssets

0.55%

Distribution and/or Service (12b-1) fees

rr_DistributionAndService12b1FeesOverAssets

0.50%

Other expenses

rr_OtherExpensesOverAssets

0.27%

Total annual operating expenses

rr_ExpensesOverAssets

1.32%

Expenses Deferred Charges [Text Block]

rr_ExpensesDeferredChargesTextBlock

Class A and Class M purchases of $1 million or more will not be subject to a front-end sales charge. Such Class A and Class M purchases may be subject, upon redemption, to a contingent deferred sales charge (CDSC) of 1.00% or 0.25%, respectively.

1 year

rr_ExpenseExampleYear01

$ 480

3 years

rr_ExpenseExampleYear03

754

5 years

rr_ExpenseExampleYear05

1,048

10 years

rr_ExpenseExampleYear10

1,885

1 Year

rr_ExpenseExampleNoRedemptionYear01

480

3 Years

rr_ExpenseExampleNoRedemptionYear03

754

5 Years

rr_ExpenseExampleNoRedemptionYear05

1,048

10 Years

rr_ExpenseExampleNoRedemptionYear10

$ 1,885

02.28 Select Portfolios: Fidelity Advisor Consumer Staples Fund - AMCI PRO-03 | Consumer Staples Portfolio | Consumer Staples Portfolio-Class C

Risk/Return:

rr_RiskReturnAbstract

Maximum sales charge (load) on purchases (as a % of offering price)

rr_MaximumCumulativeSalesChargeOverOfferingPrice

none

Maximum contingent deferred sales charge (as a % of the lesser of original purchase price or redemption proceeds)

rr_MaximumDeferredSalesChargeOverOther

1.00%

^[2]

Management fee

rr_ManagementFeesOverAssets

0.55%

Distribution and/or Service (12b-1) fees

rr_DistributionAndService12b1FeesOverAssets

1.00%

Other expenses

rr_OtherExpensesOverAssets

0.25%

Total annual operating expenses

rr_ExpensesOverAssets

1.80%

Expenses Deferred Charges [Text Block]

rr_ExpensesDeferredChargesTextBlock

On Class C shares redeemed less than one year after purchase.

1 year

rr_ExpenseExampleYear01

$ 283

3 years

rr_ExpenseExampleYear03

566

5 years

rr_ExpenseExampleYear05

975

10 years

rr_ExpenseExampleYear10

2,116

1 Year

rr_ExpenseExampleNoRedemptionYear01

183

3 Years

rr_ExpenseExampleNoRedemptionYear03

566

5 Years

rr_ExpenseExampleNoRedemptionYear05

975

10 Years

rr_ExpenseExampleNoRedemptionYear10

$ 2,116

02.28 Select Portfolios: Fidelity Advisor Consumer Staples Fund - AMCI PRO-03 | Consumer Staples Portfolio | Consumer Staples Portfolio - Class I

Risk/Return:

rr_RiskReturnAbstract

Maximum sales charge (load) on purchases (as a % of offering price)

rr_MaximumCumulativeSalesChargeOverOfferingPrice

none

Maximum contingent deferred sales charge (as a % of the lesser of original purchase price or redemption proceeds)

rr_MaximumDeferredSalesChargeOverOther

none

Management fee

rr_ManagementFeesOverAssets

0.55%

Distribution and/or Service (12b-1) fees

rr_DistributionAndService12b1FeesOverAssets

none

Other expenses

rr_OtherExpensesOverAssets

0.23%

Total annual operating expenses

rr_ExpensesOverAssets

0.78%

1 year

rr_ExpenseExampleYear01

$ 80

3 years

rr_ExpenseExampleYear03

249

5 years

rr_ExpenseExampleYear05

433

10 years

rr_ExpenseExampleYear10

966

1 Year

rr_ExpenseExampleNoRedemptionYear01

80

3 Years

rr_ExpenseExampleNoRedemptionYear03

249

5 Years

rr_ExpenseExampleNoRedemptionYear05

433

10 Years

rr_ExpenseExampleNoRedemptionYear10

$ 966

02.28 Select Portfolios: Fidelity Advisor Consumer Staples Fund - AMCI PRO-03 | Consumer Staples Portfolio | Return Before Taxes | Consumer Staples Portfolio-Class A

Risk/Return:

rr_RiskReturnAbstract

Column

rr_AverageAnnualReturnColumnName

Consumer Staples Portfolio

Label

rr_AverageAnnualReturnLabel

Class A - Return Before Taxes

Past 1 year

rr_AverageAnnualReturnYear01

(3.13%)

Past 5 years

rr_AverageAnnualReturnYear05

9.51%

Past 10 years

rr_AverageAnnualReturnYear10

8.34%

02.28 Select Portfolios: Fidelity Advisor Consumer Staples Fund - AMCI PRO-03 | Consumer Staples Portfolio | Return Before Taxes | Consumer Staples Portfolio-Class M

Risk/Return:

rr_RiskReturnAbstract

Column

rr_AverageAnnualReturnColumnName

Consumer Staples Portfolio

Label

rr_AverageAnnualReturnLabel

Class M - Return Before Taxes

Past 1 year

rr_AverageAnnualReturnYear01

(1.09%)

Past 5 years

rr_AverageAnnualReturnYear05

9.72%

Past 10 years

rr_AverageAnnualReturnYear10

8.28%

02.28 Select Portfolios: Fidelity Advisor Consumer Staples Fund - AMCI PRO-03 | Consumer Staples Portfolio | Return Before Taxes | Consumer Staples Portfolio-Class C

Risk/Return:

rr_RiskReturnAbstract

Column

rr_AverageAnnualReturnColumnName

Consumer Staples Portfolio

Label

rr_AverageAnnualReturnLabel

Class C - Return Before Taxes

Past 1 year

rr_AverageAnnualReturnYear01

1.02%

Past 5 years

rr_AverageAnnualReturnYear05

9.98%

Past 10 years

rr_AverageAnnualReturnYear10

8.16%

02.28 Select Portfolios: Fidelity Advisor Consumer Staples Fund - AMCI PRO-03 | Consumer Staples Portfolio | Return Before Taxes | Consumer Staples Portfolio - Class I

Risk/Return:

rr_RiskReturnAbstract

Column

rr_AverageAnnualReturnColumnName

Consumer Staples Portfolio

Label

rr_AverageAnnualReturnLabel

Class I - Return Before Taxes

Past 1 year

rr_AverageAnnualReturnYear01

3.04%

Past 5 years

rr_AverageAnnualReturnYear05

11.09%

Past 10 years

rr_AverageAnnualReturnYear10

9.25%

02.28 Select Portfolios: Fidelity Advisor Consumer Staples Fund - AMCI PRO-03 | Consumer Staples Portfolio | After Taxes on Distributions | Consumer Staples Portfolio-Class A

Risk/Return:

rr_RiskReturnAbstract

Column

rr_AverageAnnualReturnColumnName

Consumer Staples Portfolio

Label

rr_AverageAnnualReturnLabel

Return After Taxes on Distributions

Past 1 year

rr_AverageAnnualReturnYear01

(4.12%)

Past 5 years

rr_AverageAnnualReturnYear05

8.09%

Past 10 years

rr_AverageAnnualReturnYear10

7.40%

02.28 Select Portfolios: Fidelity Advisor Consumer Staples Fund - AMCI PRO-03 | Consumer Staples Portfolio | After Taxes on Distributions and Sales | Consumer Staples Portfolio-Class A

Risk/Return:

rr_RiskReturnAbstract

Column

rr_AverageAnnualReturnColumnName

Consumer Staples Portfolio

Label

rr_AverageAnnualReturnLabel

Return After Taxes on Distributions and Sale of Fund Shares

Past 1 year

rr_AverageAnnualReturnYear01

(0.95%)

Past 5 years

rr_AverageAnnualReturnYear05

7.46%

Past 10 years

rr_AverageAnnualReturnYear10

6.74%

02.28 Select Portfolios: Fidelity Advisor Consumer Staples Fund - AMCI PRO-03 | Consumer Staples Portfolio | S&P 500® Index(reflects no deduction for fees, expenses, or taxes)

Risk/Return:

rr_RiskReturnAbstract

Past 1 year

rr_AverageAnnualReturnYear01

11.96%

Past 5 years

rr_AverageAnnualReturnYear05

14.66%

Past 10 years

rr_AverageAnnualReturnYear10

6.95%

02.28 Select Portfolios: Fidelity Advisor Consumer Staples Fund - AMCI PRO-03 | Consumer Staples Portfolio | MSCI U.S. IMI Consumer Staples 25-50 Index(reflects no deduction for fees, expenses, or taxes)

Risk/Return:

rr_RiskReturnAbstract

Past 1 year

rr_AverageAnnualReturnYear01

6.39%

Past 5 years

rr_AverageAnnualReturnYear05

13.28%

Past 10 years

rr_AverageAnnualReturnYear10

10.36%

[1] Class A and Class M purchases of $1 million or more will not be subject to a front-end sales charge. Such Class A and Class M purchases may be subject, upon redemption, to a contingent deferred sales charge (CDSC) of 1.00% or 0.25%, respectively.

[2] On Class C shares redeemed less than one year after purchase.

XML

02.28 Select Portfolios: Fidelity Advisor Telecommunications Fund AMCI PRO-03 | Telecommunications Portfolio

Fund Summary

Fund/Class:
Telecommunications Portfolio/Fidelity Advisor® Telecommunications Fund A, M, C, I

Investment Objective

The fund seeks capital appreciation.

Fee Table

The following table describes the fees and expenses that may be incurred when you buy and hold shares of the fund.

You may qualify for sales charge discounts if you and your family invest, or agree to invest in the future, at least $50,000 in the fund or certain other Fidelity^® funds. More information about these and other discounts is available from your investment professional and in the Fund Distribution section beginning on page 25 of the prospectus.

Shareholder fees

(fees paid directly from your investment)

Shareholder Fees {- Telecommunications Portfolio} - 02.28 Select Portfolios: Fidelity Advisor Telecommunications Fund AMCI PRO-03 - Telecommunications Portfolio	Telecommunications Portfolio-Class A		Telecommunications Portfolio-Class M		Telecommunications Portfolio-Class C		Telecommunications Portfolio - Class I
Maximum sales charge (load) on purchases (as a % of offering price)	5.75%		3.50%		none		none
Maximum contingent deferred sales charge (as a % of the lesser of original purchase price or redemption proceeds)	none	[1]	none	[1]	1.00%	[2]	none

Annual Operating Expenses

(expenses that you pay each year as a % of the value of your investment)

Annual Operating Expenses {- Telecommunications Portfolio} - 02.28 Select Portfolios: Fidelity Advisor Telecommunications Fund AMCI PRO-03 - Telecommunications Portfolio	Telecommunications Portfolio-Class A	Telecommunications Portfolio-Class M	Telecommunications Portfolio-Class C	Telecommunications Portfolio - Class I
Management fee	0.55%	0.55%	0.55%	0.55%
Distribution and/or Service (12b-1) fees	0.25%	0.50%	1.00%	none
Other expenses	0.34%	0.41%	0.33%	0.25%
Total annual operating expenses	1.14%	1.46%	1.88%	0.80%

This example helps compare the cost of investing in the fund with the cost of investing in other funds.

Let's say, hypothetically, that the annual return for shares of the fund is 5% and that your shareholder fees and the annual operating expenses for shares of the fund are exactly as described in the fee table. This example illustrates the effect of fees and expenses, but is not meant to suggest actual or expected fees and expenses or returns, all of which may vary. For every $10,000 you invested, here's how much you would pay in total expenses if you sell all of your shares at the end of each time period indicated and if you hold your shares:

Sell All Shares

Expense Example {- Telecommunications Portfolio} - 02.28 Select Portfolios: Fidelity Advisor Telecommunications Fund AMCI PRO-03 - Telecommunications Portfolio - USD ($)	Telecommunications Portfolio-Class A	Telecommunications Portfolio-Class M	Telecommunications Portfolio-Class C	Telecommunications Portfolio - Class I
1 year	$ 685	$ 493	$ 291	$ 82
3 years	916	796	591	255
5 years	1,167	1,120	1,016	444
10 years	$ 1,881	$ 2,035	$ 2,201	$ 990

Hold Shares

Expense Example, No Redemption {- Telecommunications Portfolio} - 02.28 Select Portfolios: Fidelity Advisor Telecommunications Fund AMCI PRO-03 - Telecommunications Portfolio - USD ($)	Telecommunications Portfolio-Class A	Telecommunications Portfolio-Class M	Telecommunications Portfolio-Class C	Telecommunications Portfolio - Class I
1 Year	$ 685	$ 493	$ 191	$ 82
3 Years	916	796	591	255
5 Years	1,167	1,120	1,016	444
10 Years	$ 1,881	$ 2,035	$ 2,201	$ 990

Portfolio Turnover

The fund pays transaction costs, such as commissions, when it buys and sells securities (or "turns over" its portfolio). A higher portfolio turnover rate may indicate higher transaction costs and may result in higher taxes when fund shares are held in a taxable account. These costs, which are not reflected in annual operating expenses or in the example, affect the fund's performance. During the most recent fiscal year, the fund's portfolio turnover rate was 105% of the average value of its portfolio.

Principal Investment Strategies

• Normally investing primarily in common stocks.

• Normally investing at least 80% of assets in securities of companies principally engaged in the development, manufacture, or sale of communications services or communications equipment.

• Investing in domestic and foreign issuers.

• Using fundamental analysis of factors such as each issuer's financial condition and industry position, as well as market and economic conditions, to select investments.

Principal Investment Risks

• Stock Market Volatility. Stock markets are volatile and can decline significantly in response to adverse issuer, political, regulatory, market, or economic developments. Different parts of the market, including different market sectors, and different types of securities can react differently to these developments.

• Foreign Exposure. Foreign markets can be more volatile than the U.S. market due to increased risks of adverse issuer, political, regulatory, market, or economic developments and can perform differently from the U.S. market.

• Telecom Services Industry Concentration. The telecom services industry is subject to government regulation and can be significantly affected by intense competition and technology changes.

• Issuer-Specific Changes. The value of an individual security or particular type of security can be more volatile than, and can perform differently from, the market as a whole. The value of securities of smaller issuers can be more volatile than that of larger issuers.

In addition, the fund is considered non-diversified and can invest a greater portion of assets in securities of a smaller number of individual issuers than a diversified fund. As a result, changes in the market value of a single investment could cause greater fluctuations in share price than would occur in a more diversified fund.

An investment in the fund is not a deposit of a bank and is not insured or guaranteed by the Federal Deposit Insurance Corporation or any other government agency. You could lose money by investing in the fund.

Performance

The following information is intended to help you understand the risks of investing in the fund. The information illustrates the changes in the performance of the fund's shares from year to year and compares the performance of the fund's shares to the performance of a securities market index and an additional index over various periods of time. The indexes have characteristics relevant to the fund's investment strategies. Index descriptions appear in the Additional Index Information section of the prospectus. Past performance (before and after taxes) is not an indication of future performance.

Visit institutional.fidelity.com for more recent performance information.

The returns in the bar chart do not reflect any applicable sales charges; if sales charges were reflected, returns would be lower than those shown.

Year-by-Year Returns

Calendar Years

During the periods shown in the chart for Class A:	Returns	Quarter ended
Highest Quarter Return	18.58%	June 30, 2009
Lowest Quarter Return	-22.06%	December 31, 2008
Year-to-Date Return	0.03%	March 31, 2017

Average Annual Returns

Unlike the returns in the bar chart, the returns in the table reflect the maximum applicable sales charges. After-tax returns are calculated using the historical highest individual federal marginal income tax rates, but do not reflect the impact of state or local taxes. After-tax returns for Class A are shown in the table below and after-tax returns for other classes will vary. Actual after-tax returns may differ depending on your individual circumstances. The after-tax returns shown are not relevant if you hold your shares in a retirement account or in another tax-deferred arrangement, such as an employee benefit plan (profit sharing, 401(k), or 403(b) plan).

For the periods ended December 31, 2016

Average Annual Total Returns{- Telecommunications Portfolio} - 02.28 Select Portfolios: Fidelity Advisor Telecommunications Fund AMCI PRO-03 - Telecommunications Portfolio	Past 1 year	Past 5 years	Past 10 years
Telecommunications Portfolio-Class A | Return Before Taxes	15.35%	11.71%	5.26%
Telecommunications Portfolio-Class A | After Taxes on Distributions	13.27%	10.88%	4.77%
Telecommunications Portfolio-Class A | After Taxes on Distributions and Sales	9.52%	9.19%	4.12%
Telecommunications Portfolio-Class M | Return Before Taxes	17.71%	11.89%	5.20%
Telecommunications Portfolio-Class C | Return Before Taxes	20.49%	12.23%	5.12%
Telecommunications Portfolio - Class I | Return Before Taxes	22.80%	13.40%	6.22%
S&P 500® Index(reflects no deduction for fees, expenses, or taxes)	11.96%	14.66%	6.95%
MSCI U.S. IMI Telecommunications Services 25-50 Index(reflects no deduction for fees, expenses, or taxes)	22.45%	13.65%	6.30%

02.28 Select Portfolios: Fidelity Advisor Telecommunications Fund AMCI PRO-03 | Telecommunications Portfolio | Telecommunications Portfolio-Class A

Class A and Class M purchases of $1 million or more will not be subject to a front-end sales charge. Such Class A and Class M purchases may be subject, upon redemption, to a contingent deferred sales charge (CDSC) of 1.00% or 0.25%, respectively.

02.28 Select Portfolios: Fidelity Advisor Telecommunications Fund AMCI PRO-03 | Telecommunications Portfolio | Telecommunications Portfolio-Class M

Class A and Class M purchases of $1 million or more will not be subject to a front-end sales charge. Such Class A and Class M purchases may be subject, upon redemption, to a contingent deferred sales charge (CDSC) of 1.00% or 0.25%, respectively.

02.28 Select Portfolios: Fidelity Advisor Telecommunications Fund AMCI PRO-03 | Telecommunications Portfolio | Telecommunications Portfolio-Class C

On Class C shares redeemed less than one year after purchase.

[1] Class A and Class M purchases of $1 million or more will not be subject to a front-end sales charge. Such Class A and Class M purchases may be subject, upon redemption, to a contingent deferred sales charge (CDSC) of 1.00% or 0.25%, respectively.

[2] On Class C shares redeemed less than one year after purchase.

XML

Label

Element

Value

Risk/Return:

rr_RiskReturnAbstract

Registrant Name

dei_EntityRegistrantName

FIDELITY SELECT PORTFOLIOS

Prospectus Date

rr_ProspectusDate

Apr. 29, 2017

02.28 Select Portfolios: Fidelity Advisor Telecommunications Fund AMCI PRO-03 | Telecommunications Portfolio

Risk/Return:

rr_RiskReturnAbstract

Risk/Return [Heading]

rr_RiskReturnHeading

Fund Summary

Fund/Class:
Telecommunications Portfolio/Fidelity Advisor® Telecommunications Fund A, M, C, I

Objective [Heading]

rr_ObjectiveHeading

Investment Objective

Objective, Primary [Text Block]

rr_ObjectivePrimaryTextBlock

The fund seeks capital appreciation.

Expense [Heading]

rr_ExpenseHeading

Fee Table

Expense Narrative [Text Block]

rr_ExpenseNarrativeTextBlock

The following table describes the fees and expenses that may be incurred when you buy and hold shares of the fund.

You may qualify for sales charge discounts if you and your family invest, or agree to invest in the future, at least $50,000 in the fund or certain other Fidelity^® funds. More information about these and other discounts is available from your investment professional and in the Fund Distribution section beginning on page 25 of the prospectus.

Shareholder Fees Caption [Text]

rr_ShareholderFeesCaption

Shareholder fees

(fees paid directly from your investment)

Operating Expenses Caption [Text]

rr_OperatingExpensesCaption

Annual Operating Expenses

(expenses that you pay each year as a % of the value of your investment)

Portfolio Turnover [Heading]

rr_PortfolioTurnoverHeading

Portfolio Turnover

Portfolio Turnover [Text Block]

rr_PortfolioTurnoverTextBlock

The fund pays transaction costs, such as commissions, when it buys and sells securities (or "turns over" its portfolio). A higher portfolio turnover rate may indicate higher transaction costs and may result in higher taxes when fund shares are held in a taxable account. These costs, which are not reflected in annual operating expenses or in the example, affect the fund's performance. During the most recent fiscal year, the fund's portfolio turnover rate was 105% of the average value of its portfolio.

Portfolio Turnover, Rate

rr_PortfolioTurnoverRate

105.00%

Expense Breakpoint Discounts [Text]

rr_ExpenseBreakpointDiscounts

You may qualify for sales charge discounts if you and your family invest, or agree to invest in the future, at least $50,000 in the fund or certain other Fidelity® funds. More information about these and other discounts is available from your investment professional and in the Fund Distribution section beginning on page 25 of the prospectus.

Expense Breakpoint, Minimum Investment Required [Amount]

rr_ExpenseBreakpointMinimumInvestmentRequiredAmount

$ 50,000

Expense Example Narrative [Text Block]

rr_ExpenseExampleNarrativeTextBlock

This example helps compare the cost of investing in the fund with the cost of investing in other funds.

Let's say, hypothetically, that the annual return for shares of the fund is 5% and that your shareholder fees and the annual operating expenses for shares of the fund are exactly as described in the fee table. This example illustrates the effect of fees and expenses, but is not meant to suggest actual or expected fees and expenses or returns, all of which may vary. For every $10,000 you invested, here's how much you would pay in total expenses if you sell all of your shares at the end of each time period indicated and if you hold your shares:

Expense Example by, Year, Caption [Text]

rr_ExpenseExampleByYearCaption

Sell All Shares

Expense Example, No Redemption, By Year, Caption [Text]

rr_ExpenseExampleNoRedemptionByYearCaption

Hold Shares

Strategy [Heading]

rr_StrategyHeading

Principal Investment Strategies

Strategy Narrative [Text Block]

rr_StrategyNarrativeTextBlock

• Normally investing primarily in common stocks.

• Normally investing at least 80% of assets in securities of companies principally engaged in the development, manufacture, or sale of communications services or communications equipment.

• Investing in domestic and foreign issuers.

• Using fundamental analysis of factors such as each issuer's financial condition and industry position, as well as market and economic conditions, to select investments.

Strategy Portfolio Concentration [Text]

rr_StrategyPortfolioConcentration

Normally investing at least 80% of assets in securities of companies principally engaged in the development, manufacture, or sale of communications services or communications equipment.

Risk [Heading]

rr_RiskHeading

Principal Investment Risks

Risk Narrative [Text Block]

rr_RiskNarrativeTextBlock

• Stock Market Volatility. Stock markets are volatile and can decline significantly in response to adverse issuer, political, regulatory, market, or economic developments. Different parts of the market, including different market sectors, and different types of securities can react differently to these developments.

• Foreign Exposure. Foreign markets can be more volatile than the U.S. market due to increased risks of adverse issuer, political, regulatory, market, or economic developments and can perform differently from the U.S. market.

• Telecom Services Industry Concentration. The telecom services industry is subject to government regulation and can be significantly affected by intense competition and technology changes.

• Issuer-Specific Changes. The value of an individual security or particular type of security can be more volatile than, and can perform differently from, the market as a whole. The value of securities of smaller issuers can be more volatile than that of larger issuers.

In addition, the fund is considered non-diversified and can invest a greater portion of assets in securities of a smaller number of individual issuers than a diversified fund. As a result, changes in the market value of a single investment could cause greater fluctuations in share price than would occur in a more diversified fund.

An investment in the fund is not a deposit of a bank and is not insured or guaranteed by the Federal Deposit Insurance Corporation or any other government agency. You could lose money by investing in the fund.

Risk Lose Money [Text]

rr_RiskLoseMoney

You could lose money by investing in the fund.

Risk Nondiversified Status [Text]

rr_RiskNondiversifiedStatus

In addition, the fund is considered non-diversified and can invest a greater portion of assets in securities of a smaller number of individual issuers than a diversified fund. As a result, changes in the market value of a single investment could cause greater fluctuations in share price than would occur in a more diversified fund.

Risk Not Insured Depository Institution [Text]

rr_RiskNotInsuredDepositoryInstitution

An investment in the fund is not a deposit of a bank and is not insured or guaranteed by the Federal Deposit Insurance Corporation or any other government agency.

Bar Chart and Performance Table [Heading]

rr_BarChartAndPerformanceTableHeading

Performance

Performance Narrative [Text Block]

rr_PerformanceNarrativeTextBlock

The following information is intended to help you understand the risks of investing in the fund. The information illustrates the changes in the performance of the fund's shares from year to year and compares the performance of the fund's shares to the performance of a securities market index and an additional index over various periods of time. The indexes have characteristics relevant to the fund's investment strategies. Index descriptions appear in the Additional Index Information section of the prospectus. Past performance (before and after taxes) is not an indication of future performance.

Visit institutional.fidelity.com for more recent performance information.

Performance Information Illustrates Variability of Returns [Text]

rr_PerformanceInformationIllustratesVariabilityOfReturns

The information illustrates the changes in the performance of the fund's shares from year to year and compares the performance of the fund's shares to the performance of a securities market index and an additional index over various periods of time.

Performance Availability Website Address [Text]

rr_PerformanceAvailabilityWebSiteAddress

institutional.fidelity.com

Performance Past Does Not Indicate Future [Text]

rr_PerformancePastDoesNotIndicateFuture

Past performance (before and after taxes) is not an indication of future performance.

Bar Chart [Heading]

rr_BarChartHeading

Year-by-Year Returns

Calendar Years

Bar Chart Narrative [Text Block]

rr_BarChartNarrativeTextBlock

The returns in the bar chart do not reflect any applicable sales charges; if sales charges were reflected, returns would be lower than those shown.

Bar Chart Does Not Reflect Sales Loads [Text]

rr_BarChartDoesNotReflectSalesLoads

The returns in the bar chart do not reflect any applicable sales charges; if sales charges were reflected, returns would be lower than those shown.

Bar Chart Closing [Text Block]

rr_BarChartClosingTextBlock

During the periods shown in the chart for Class A:	Returns	Quarter ended
Highest Quarter Return	18.58%	June 30, 2009
Lowest Quarter Return	-22.06%	December 31, 2008
Year-to-Date Return	0.03%	March 31, 2017

Performance Table Heading

rr_PerformanceTableHeading

Average Annual Returns

Performance Table Does Reflect Sales Loads

rr_PerformanceTableDoesReflectSalesLoads

Unlike the returns in the bar chart, the returns in the table reflect the maximum applicable sales charges.

Performance Table Uses Highest Federal Rate

rr_PerformanceTableUsesHighestFederalRate

After-tax returns are calculated using the historical highest individual federal marginal income tax rates, but do not reflect the impact of state or local taxes.

Performance Table Not Relevant to Tax Deferred

rr_PerformanceTableNotRelevantToTaxDeferred

The after-tax returns shown are not relevant if you hold your shares in a retirement account or in another tax-deferred arrangement, such as an employee benefit plan (profit sharing, 401(k), or 403(b) plan).

Performance Table One Class of after Tax Shown [Text]

rr_PerformanceTableOneClassOfAfterTaxShown

After-tax returns for Class A are shown in the table below and after-tax returns for other classes will vary.

Performance Table Narrative

rr_PerformanceTableNarrativeTextBlock

Unlike the returns in the bar chart, the returns in the table reflect the maximum applicable sales charges. After-tax returns are calculated using the historical highest individual federal marginal income tax rates, but do not reflect the impact of state or local taxes. After-tax returns for Class A are shown in the table below and after-tax returns for other classes will vary. Actual after-tax returns may differ depending on your individual circumstances. The after-tax returns shown are not relevant if you hold your shares in a retirement account or in another tax-deferred arrangement, such as an employee benefit plan (profit sharing, 401(k), or 403(b) plan).

For the periods ended December 31, 2016

02.28 Select Portfolios: Fidelity Advisor Telecommunications Fund AMCI PRO-03 | Telecommunications Portfolio | Telecommunications Portfolio-Class A

Risk/Return:

rr_RiskReturnAbstract

Maximum sales charge (load) on purchases (as a % of offering price)

rr_MaximumCumulativeSalesChargeOverOfferingPrice

5.75%

Maximum contingent deferred sales charge (as a % of the lesser of original purchase price or redemption proceeds)

rr_MaximumDeferredSalesChargeOverOther

none

^[1]

Management fee

rr_ManagementFeesOverAssets

0.55%

Distribution and/or Service (12b-1) fees

rr_DistributionAndService12b1FeesOverAssets

0.25%

Other expenses

rr_OtherExpensesOverAssets

0.34%

Total annual operating expenses

rr_ExpensesOverAssets

1.14%

Expenses Deferred Charges [Text Block]

rr_ExpensesDeferredChargesTextBlock

Class A and Class M purchases of $1 million or more will not be subject to a front-end sales charge. Such Class A and Class M purchases may be subject, upon redemption, to a contingent deferred sales charge (CDSC) of 1.00% or 0.25%, respectively.

1 year

rr_ExpenseExampleYear01

$ 685

3 years

rr_ExpenseExampleYear03

916

5 years

rr_ExpenseExampleYear05

1,167

10 years

rr_ExpenseExampleYear10

1,881

1 Year

rr_ExpenseExampleNoRedemptionYear01

685

3 Years

rr_ExpenseExampleNoRedemptionYear03

916

5 Years

rr_ExpenseExampleNoRedemptionYear05

1,167

10 Years

rr_ExpenseExampleNoRedemptionYear10

$ 1,881

2007

rr_AnnualReturn2007

7.92%

2008

rr_AnnualReturn2008

(47.80%)

2009

rr_AnnualReturn2009

51.19%

2010

rr_AnnualReturn2010

18.01%

2011

rr_AnnualReturn2011

(4.52%)

2012

rr_AnnualReturn2012

18.27%

2013

rr_AnnualReturn2013

21.12%

2014

rr_AnnualReturn2014

3.27%

2015

rr_AnnualReturn2015

1.96%

2016

rr_AnnualReturn2016

22.39%

Year to Date Return, Label

rr_YearToDateReturnLabel

Year-to-Date Return

Bar Chart, Year to Date Return, Date

rr_BarChartYearToDateReturnDate

Mar. 31, 2017

Bar Chart, Year to Date Return

rr_BarChartYearToDateReturn

0.03%

Highest Quarterly Return, Label

rr_HighestQuarterlyReturnLabel

Highest Quarter Return

Highest Quarterly Return, Date

rr_BarChartHighestQuarterlyReturnDate

Jun. 30, 2009

Highest Quarterly Return

rr_BarChartHighestQuarterlyReturn

18.58%

Lowest Quarterly Return, Label

rr_LowestQuarterlyReturnLabel

Lowest Quarter Return

Lowest Quarterly Return, Date

rr_BarChartLowestQuarterlyReturnDate

Dec. 31, 2008

Lowest Quarterly Return

rr_BarChartLowestQuarterlyReturn

(22.06%)

02.28 Select Portfolios: Fidelity Advisor Telecommunications Fund AMCI PRO-03 | Telecommunications Portfolio | Telecommunications Portfolio-Class M

Risk/Return:

rr_RiskReturnAbstract

Maximum sales charge (load) on purchases (as a % of offering price)

rr_MaximumCumulativeSalesChargeOverOfferingPrice

3.50%

Maximum contingent deferred sales charge (as a % of the lesser of original purchase price or redemption proceeds)

rr_MaximumDeferredSalesChargeOverOther

none

^[1]

Management fee

rr_ManagementFeesOverAssets

0.55%

Distribution and/or Service (12b-1) fees

rr_DistributionAndService12b1FeesOverAssets

0.50%

Other expenses

rr_OtherExpensesOverAssets

0.41%

Total annual operating expenses

rr_ExpensesOverAssets

1.46%

Expenses Deferred Charges [Text Block]

rr_ExpensesDeferredChargesTextBlock

Class A and Class M purchases of $1 million or more will not be subject to a front-end sales charge. Such Class A and Class M purchases may be subject, upon redemption, to a contingent deferred sales charge (CDSC) of 1.00% or 0.25%, respectively.

1 year

rr_ExpenseExampleYear01

$ 493

3 years

rr_ExpenseExampleYear03

796

5 years

rr_ExpenseExampleYear05

1,120

10 years

rr_ExpenseExampleYear10

2,035

1 Year

rr_ExpenseExampleNoRedemptionYear01

493

3 Years

rr_ExpenseExampleNoRedemptionYear03

796

5 Years

rr_ExpenseExampleNoRedemptionYear05

1,120

10 Years

rr_ExpenseExampleNoRedemptionYear10

$ 2,035

02.28 Select Portfolios: Fidelity Advisor Telecommunications Fund AMCI PRO-03 | Telecommunications Portfolio | Telecommunications Portfolio-Class C

Risk/Return:

rr_RiskReturnAbstract

Maximum sales charge (load) on purchases (as a % of offering price)

rr_MaximumCumulativeSalesChargeOverOfferingPrice

none

Maximum contingent deferred sales charge (as a % of the lesser of original purchase price or redemption proceeds)

rr_MaximumDeferredSalesChargeOverOther

1.00%

^[2]

Management fee

rr_ManagementFeesOverAssets

0.55%

Distribution and/or Service (12b-1) fees

rr_DistributionAndService12b1FeesOverAssets

1.00%

Other expenses

rr_OtherExpensesOverAssets

0.33%

Total annual operating expenses

rr_ExpensesOverAssets

1.88%

Expenses Deferred Charges [Text Block]

rr_ExpensesDeferredChargesTextBlock

On Class C shares redeemed less than one year after purchase.

1 year

rr_ExpenseExampleYear01

$ 291

3 years

rr_ExpenseExampleYear03

591

5 years

rr_ExpenseExampleYear05

1,016

10 years

rr_ExpenseExampleYear10

2,201

1 Year

rr_ExpenseExampleNoRedemptionYear01

191

3 Years

rr_ExpenseExampleNoRedemptionYear03

591

5 Years

rr_ExpenseExampleNoRedemptionYear05

1,016

10 Years

rr_ExpenseExampleNoRedemptionYear10

$ 2,201

02.28 Select Portfolios: Fidelity Advisor Telecommunications Fund AMCI PRO-03 | Telecommunications Portfolio | Telecommunications Portfolio - Class I

Risk/Return:

rr_RiskReturnAbstract

Maximum sales charge (load) on purchases (as a % of offering price)

rr_MaximumCumulativeSalesChargeOverOfferingPrice

none

Maximum contingent deferred sales charge (as a % of the lesser of original purchase price or redemption proceeds)

rr_MaximumDeferredSalesChargeOverOther

none

Management fee

rr_ManagementFeesOverAssets

0.55%

Distribution and/or Service (12b-1) fees

rr_DistributionAndService12b1FeesOverAssets

none

Other expenses

rr_OtherExpensesOverAssets

0.25%

Total annual operating expenses

rr_ExpensesOverAssets

0.80%

1 year

rr_ExpenseExampleYear01

$ 82

3 years

rr_ExpenseExampleYear03

255

5 years

rr_ExpenseExampleYear05

444

10 years

rr_ExpenseExampleYear10

990

1 Year

rr_ExpenseExampleNoRedemptionYear01

82

3 Years

rr_ExpenseExampleNoRedemptionYear03

255

5 Years

rr_ExpenseExampleNoRedemptionYear05

444

10 Years

rr_ExpenseExampleNoRedemptionYear10

$ 990

02.28 Select Portfolios: Fidelity Advisor Telecommunications Fund AMCI PRO-03 | Telecommunications Portfolio | Return Before Taxes | Telecommunications Portfolio-Class A

Risk/Return:

rr_RiskReturnAbstract

Column

rr_AverageAnnualReturnColumnName

Telecommunications Portfolio

Label

rr_AverageAnnualReturnLabel

Class A - Return Before Taxes

Past 1 year

rr_AverageAnnualReturnYear01

15.35%

Past 5 years

rr_AverageAnnualReturnYear05

11.71%

Past 10 years

rr_AverageAnnualReturnYear10

5.26%

02.28 Select Portfolios: Fidelity Advisor Telecommunications Fund AMCI PRO-03 | Telecommunications Portfolio | Return Before Taxes | Telecommunications Portfolio-Class M

Risk/Return:

rr_RiskReturnAbstract

Column

rr_AverageAnnualReturnColumnName

Telecommunications Portfolio

Label

rr_AverageAnnualReturnLabel

Class M - Return Before Taxes

Past 1 year

rr_AverageAnnualReturnYear01

17.71%

Past 5 years

rr_AverageAnnualReturnYear05

11.89%

Past 10 years

rr_AverageAnnualReturnYear10

5.20%

02.28 Select Portfolios: Fidelity Advisor Telecommunications Fund AMCI PRO-03 | Telecommunications Portfolio | Return Before Taxes | Telecommunications Portfolio-Class C

Risk/Return:

rr_RiskReturnAbstract

Column

rr_AverageAnnualReturnColumnName

Telecommunications Portfolio

Label

rr_AverageAnnualReturnLabel

Class C - Return Before Taxes

Past 1 year

rr_AverageAnnualReturnYear01

20.49%

Past 5 years

rr_AverageAnnualReturnYear05

12.23%

Past 10 years

rr_AverageAnnualReturnYear10

5.12%

02.28 Select Portfolios: Fidelity Advisor Telecommunications Fund AMCI PRO-03 | Telecommunications Portfolio | Return Before Taxes | Telecommunications Portfolio - Class I

Risk/Return:

rr_RiskReturnAbstract

Column

rr_AverageAnnualReturnColumnName

Telecommunications Portfolio

Label

rr_AverageAnnualReturnLabel

Class I - Return Before Taxes

Past 1 year

rr_AverageAnnualReturnYear01

22.80%

Past 5 years

rr_AverageAnnualReturnYear05

13.40%

Past 10 years

rr_AverageAnnualReturnYear10

6.22%

02.28 Select Portfolios: Fidelity Advisor Telecommunications Fund AMCI PRO-03 | Telecommunications Portfolio | After Taxes on Distributions | Telecommunications Portfolio-Class A

Risk/Return:

rr_RiskReturnAbstract

Column

rr_AverageAnnualReturnColumnName

Telecommunications Portfolio

Label

rr_AverageAnnualReturnLabel

Return After Taxes on Distributions

Past 1 year

rr_AverageAnnualReturnYear01

13.27%

Past 5 years

rr_AverageAnnualReturnYear05

10.88%

Past 10 years

rr_AverageAnnualReturnYear10

4.77%

02.28 Select Portfolios: Fidelity Advisor Telecommunications Fund AMCI PRO-03 | Telecommunications Portfolio | After Taxes on Distributions and Sales | Telecommunications Portfolio-Class A

Risk/Return:

rr_RiskReturnAbstract

Column

rr_AverageAnnualReturnColumnName

Telecommunications Portfolio

Label

rr_AverageAnnualReturnLabel

Return After Taxes on Distributions and Sale of Fund Shares

Past 1 year

rr_AverageAnnualReturnYear01

9.52%

Past 5 years

rr_AverageAnnualReturnYear05

9.19%

Past 10 years

rr_AverageAnnualReturnYear10

4.12%

02.28 Select Portfolios: Fidelity Advisor Telecommunications Fund AMCI PRO-03 | Telecommunications Portfolio | S&P 500® Index(reflects no deduction for fees, expenses, or taxes)

Risk/Return:

rr_RiskReturnAbstract

Past 1 year

rr_AverageAnnualReturnYear01

11.96%

Past 5 years

rr_AverageAnnualReturnYear05

14.66%

Past 10 years

rr_AverageAnnualReturnYear10

6.95%

02.28 Select Portfolios: Fidelity Advisor Telecommunications Fund AMCI PRO-03 | Telecommunications Portfolio | MSCI U.S. IMI Telecommunications Services 25-50 Index(reflects no deduction for fees, expenses, or taxes)

Risk/Return:

rr_RiskReturnAbstract

Past 1 year

rr_AverageAnnualReturnYear01

22.45%

Past 5 years

rr_AverageAnnualReturnYear05

13.65%

Past 10 years

rr_AverageAnnualReturnYear10

6.30%

[1] Class A and Class M purchases of $1 million or more will not be subject to a front-end sales charge. Such Class A and Class M purchases may be subject, upon redemption, to a contingent deferred sales charge (CDSC) of 1.00% or 0.25%, respectively.

[2] On Class C shares redeemed less than one year after purchase.

XML

02.28 Select Portfolios: Fidelity Advisor Gold Fund - AMCI PRO-03 | Gold Portfolio

Fund Summary

Fund/Class:
Gold Portfolio/Fidelity Advisor® Gold Fund A, M, C, I

Investment Objective

The fund seeks capital appreciation.

Fee Table

The following table describes the fees and expenses that may be incurred when you buy and hold shares of the fund.

You may qualify for sales charge discounts if you and your family invest, or agree to invest in the future, at least $50,000 in the fund or certain other Fidelity^® funds. More information about these and other discounts is available from your investment professional and in the Fund Distribution section beginning on page 27 of the prospectus.

Shareholder fees

(fees paid directly from your investment)

Shareholder Fees {- Gold Portfolio} - 02.28 Select Portfolios: Fidelity Advisor Gold Fund - AMCI PRO-03 - Gold Portfolio	Gold Portfolio-Class A		Gold Portfolio-Class M		Gold Portfolio-Class C		Gold Portfolio - Class I
Maximum sales charge (load) on purchases (as a % of offering price)	5.75%		3.50%		none		none
Maximum contingent deferred sales charge (as a % of the lesser of original purchase price or redemption proceeds)	none	[1]	none	[1]	1.00%	[2]	none

Annual Operating Expenses

(expenses that you pay each year as a % of the value of your investment)

Annual Operating Expenses {- Gold Portfolio} - 02.28 Select Portfolios: Fidelity Advisor Gold Fund - AMCI PRO-03 - Gold Portfolio		Gold Portfolio-Class A	Gold Portfolio-Class M	Gold Portfolio-Class C	Gold Portfolio - Class I
Management fee		0.55%	0.55%	0.55%	0.55%
Distribution and/or Service (12b-1) fees		0.25%	0.50%	1.00%	none
Other expenses		0.35%	0.40%	0.29%	0.28%
Acquired fund fees and expenses	[1]	0.04%	0.04%	0.04%	0.04%
Total annual operating expenses		1.19%	1.49%	1.88%	0.87%
Fee waiver and/or expense reimbursement	[1]	0.03%	0.03%	0.03%	0.03%
Total annual operating expenses after fee waiver and/or expense reimbursement		1.16%	1.46%	1.85%	0.84%

This example helps compare the cost of investing in the fund with the cost of investing in other funds.

Let's say, hypothetically, that the annual return for shares of the fund is 5% and that your shareholder fees and the annual operating expenses for shares of the fund are exactly as described in the fee table. This example illustrates the effect of fees and expenses, but is not meant to suggest actual or expected fees and expenses or returns, all of which may vary. For every $10,000 you invested, here's how much you would pay in total expenses if you sell all of your shares at the end of each time period indicated and if you hold your shares:

Sell All Shares

Expense Example {- Gold Portfolio} - 02.28 Select Portfolios: Fidelity Advisor Gold Fund - AMCI PRO-03 - Gold Portfolio - USD ($)	Gold Portfolio-Class A	Gold Portfolio-Class M	Gold Portfolio-Class C	Gold Portfolio - Class I
1 year	$ 686	$ 493	$ 288	$ 86
3 years	922	796	582	268
5 years	1,177	1,120	1,001	466
10 years	$ 1,903	$ 2,035	$ 2,169	$ 1,037

Hold Shares

Expense Example, No Redemption {- Gold Portfolio} - 02.28 Select Portfolios: Fidelity Advisor Gold Fund - AMCI PRO-03 - Gold Portfolio - USD ($)	Gold Portfolio-Class A	Gold Portfolio-Class M	Gold Portfolio-Class C	Gold Portfolio - Class I
1 Year	$ 686	$ 493	$ 188	$ 86
3 Years	922	796	582	268
5 Years	1,177	1,120	1,001	466
10 Years	$ 1,903	$ 2,035	$ 2,169	$ 1,037

Portfolio Turnover

The fund pays transaction costs, such as commissions, when it buys and sells securities (or "turns over" its portfolio). A higher portfolio turnover rate may indicate higher transaction costs and may result in higher taxes when fund shares are held in a taxable account. These costs, which are not reflected in annual operating expenses or in the example, affect the fund's performance. During the most recent fiscal year, the fund's portfolio turnover rate was 28% of the average value of its portfolio.

Principal Investment Strategies

• Normally investing primarily in common stocks and in certain precious metals.

• Investing primarily in companies engaged in exploration, mining, processing, or dealing in gold, or to a lesser degree, in silver, platinum, diamonds, or other precious metals and minerals.

• Normally investing at least 80% of assets in securities of companies principally engaged in gold-related activities, and in gold bullion or coins.

• Investing up to 25% of assets in gold and other precious metals through a wholly-owned subsidiary.

• Potentially investing in other precious metals, instruments whose value is linked to the price of precious metals, and securities of companies that manufacture and distribute precious metal and minerals products (such as jewelry, watches, and metal foil and leaf) and companies that invest in other companies engaged in gold and other precious metal and mineral-related activities.

• Investing in domestic and foreign issuers.

• Using fundamental analysis of factors such as each issuer's financial condition and industry position, as well as market and economic conditions, to select investments.

Principal Investment Risks

• Stock Market Volatility. Stock markets are volatile and can decline significantly in response to adverse issuer, political, regulatory, market, or economic developments. Different parts of the market, including different market sectors, and different types of securities can react differently to these developments.

• Foreign Exposure. Foreign markets, particularly emerging markets, can be more volatile than the U.S. market due to increased risks of adverse issuer, political, regulatory, market, or economic developments and can perform differently from the U.S. market. Emerging markets can be subject to greater social, economic, regulatory, and political uncertainties and can be extremely volatile. Foreign exchange rates also can be extremely volatile.

• Gold Industry Concentration. The gold industry can be significantly affected by international monetary and political developments such as currency devaluations or revaluations, central bank movements, economic and social conditions within a country, trade imbalances, or trade or currency restrictions between countries, as well as supply and demand for gold and operational costs associated with mining.

• Subsidiary Risk. Investment in an unregistered subsidiary is not subject to the investor protections of the Investment Company Act of 1940 (1940 Act) and is subject to the risks associated with the gold industry. Changes in tax and other laws could negatively affect investments in the subsidiary.

• Issuer-Specific Changes. The value of an individual security or particular type of security can be more volatile than, and can perform differently from, the market as a whole. The value of securities of smaller issuers can be more volatile than that of larger issuers.

In addition, the fund is considered non-diversified and can invest a greater portion of assets in securities of a smaller number of individual issuers than a diversified fund. As a result, changes in the market value of a single investment could cause greater fluctuations in share price than would occur in a more diversified fund.

An investment in the fund is not a deposit of a bank and is not insured or guaranteed by the Federal Deposit Insurance Corporation or any other government agency. You could lose money by investing in the fund.

Performance

The following information is intended to help you understand the risks of investing in the fund. The information illustrates the changes in the performance of the fund's shares from year to year and compares the performance of the fund's shares to the performance of a securities market index and an additional index over various periods of time. The indexes have characteristics relevant to the fund's investment strategies. Index descriptions appear in the Additional Index Information section of the prospectus. Past performance (before and after taxes) is not an indication of future performance.

Visit institutional.fidelity.com for more recent performance information.

The returns in the bar chart do not reflect any applicable sales charges; if sales charges were reflected, returns would be lower than those shown.

Year-by-Year Returns

Calendar Years

During the periods shown in the chart for Class A:	Returns	Quarter ended
Highest Quarter Return	40.94%	March 31, 2016
Lowest Quarter Return	-37.42%	June 30, 2013
Year-to-Date Return	9.66%	March 31, 2017

Average Annual Returns

Unlike the returns in the bar chart, the returns in the table reflect the maximum applicable sales charges. After-tax returns are calculated using the historical highest individual federal marginal income tax rates, but do not reflect the impact of state or local taxes. After-tax returns for Class A are shown in the table below and after-tax returns for other classes will vary. Actual after-tax returns may differ depending on your individual circumstances. The after-tax returns shown are not relevant if you hold your shares in a retirement account or in another tax-deferred arrangement, such as an employee benefit plan (profit sharing, 401(k), or 403(b) plan). Return After Taxes on Distributions and Sale of Fund Shares may be higher than other returns for the same period due to a tax benefit of realizing a capital loss upon the sale of fund shares.

For the periods ended December 31, 2016

Average Annual Total Returns{- Gold Portfolio} - 02.28 Select Portfolios: Fidelity Advisor Gold Fund - AMCI PRO-03 - Gold Portfolio	Past 1 year	Past 5 years	Past 10 years
Gold Portfolio-Class A | Return Before Taxes	38.36%	(15.24%)	(3.94%)
Gold Portfolio-Class A | After Taxes on Distributions	36.63%	(15.45%)	(4.71%)
Gold Portfolio-Class A | After Taxes on Distributions and Sales	21.89%	(10.66%)	(2.46%)
Gold Portfolio-Class M | Return Before Taxes	41.23%	(15.07%)	(3.96%)
Gold Portfolio-Class C | Return Before Taxes	44.74%	(14.86%)	(4.09%)
Gold Portfolio - Class I | Return Before Taxes	47.29%	(13.94%)	(3.06%)
S&P 500® Index(reflects no deduction for fees, expenses, or taxes)	11.96%	14.66%	6.95%
S&P® Global BMI Gold Capped Index(reflects no deduction for fees, expenses, or taxes)	58.24%	(14.10%)	(4.20%)

02.28 Select Portfolios: Fidelity Advisor Gold Fund - AMCI PRO-03 | Gold Portfolio | Gold Portfolio-Class A

Class A and Class M purchases of $1 million or more will not be subject to a front-end sales charge. Such Class A and Class M purchases may be subject, upon redemption, to a contingent deferred sales charge (CDSC) of 1.00% or 0.25%, respectively.

02.28 Select Portfolios: Fidelity Advisor Gold Fund - AMCI PRO-03 | Gold Portfolio | Gold Portfolio-Class M

Class A and Class M purchases of $1 million or more will not be subject to a front-end sales charge. Such Class A and Class M purchases may be subject, upon redemption, to a contingent deferred sales charge (CDSC) of 1.00% or 0.25%, respectively.

02.28 Select Portfolios: Fidelity Advisor Gold Fund - AMCI PRO-03 | Gold Portfolio | Gold Portfolio-Class C

On Class C shares redeemed less than one year after purchase.

[1] Class A and Class M purchases of $1 million or more will not be subject to a front-end sales charge. Such Class A and Class M purchases may be subject, upon redemption, to a contingent deferred sales charge (CDSC) of 1.00% or 0.25%, respectively.

[2] On Class C shares redeemed less than one year after purchase.

[1] The fund may invest in a wholly-owned subsidiary. The subsidiary has entered into a separate contract with Fidelity Management & Research Company (FMR), an affiliate of Fidelity SelectCo, LLC (SelectCo), the fund's investment adviser, for the management of its portfolio pursuant to which the subsidiary pays FMR a fee at an annual rate of 0.30% of its net assets. The subsidiary also pays certain other expenses including custody fees. SelectCo has contractually agreed to waive the fund's management fee in an amount equal to the management fee paid to FMR by the subsidiary. This arrangement will remain in effect for at least one year from the effective date of the prospectus, and will remain in effect thereafter as long as FMR's contract with the subsidiary is in place. If FMR's contract with the subsidiary is terminated, SelectCo, in its sole discretion, may discontinue the arrangement.

XML

Label

Element

Value

Risk/Return:

rr_RiskReturnAbstract

Registrant Name

dei_EntityRegistrantName

FIDELITY SELECT PORTFOLIOS

Prospectus Date

rr_ProspectusDate

Apr. 29, 2017

02.28 Select Portfolios: Fidelity Advisor Gold Fund - AMCI PRO-03 | Gold Portfolio

Risk/Return:

rr_RiskReturnAbstract

Risk/Return [Heading]

rr_RiskReturnHeading

Fund Summary

Fund/Class:
Gold Portfolio/Fidelity Advisor® Gold Fund A, M, C, I

Objective [Heading]

rr_ObjectiveHeading

Investment Objective

Objective, Primary [Text Block]

rr_ObjectivePrimaryTextBlock

The fund seeks capital appreciation.

Expense [Heading]

rr_ExpenseHeading

Fee Table

Expense Narrative [Text Block]

rr_ExpenseNarrativeTextBlock

The following table describes the fees and expenses that may be incurred when you buy and hold shares of the fund.

You may qualify for sales charge discounts if you and your family invest, or agree to invest in the future, at least $50,000 in the fund or certain other Fidelity^® funds. More information about these and other discounts is available from your investment professional and in the Fund Distribution section beginning on page 27 of the prospectus.

Shareholder Fees Caption [Text]

rr_ShareholderFeesCaption

Shareholder fees

(fees paid directly from your investment)

Operating Expenses Caption [Text]

rr_OperatingExpensesCaption

Annual Operating Expenses

(expenses that you pay each year as a % of the value of your investment)

Fee Waiver or Reimbursement over Assets, Date of Termination

rr_FeeWaiverOrReimbursementOverAssetsDateOfTermination

remain in effect for at least one year from the effective date of the prospectus, and will remain in effect thereafter as long as FMR's contract with the subsidiary is in place.

Portfolio Turnover [Heading]

rr_PortfolioTurnoverHeading

Portfolio Turnover

Portfolio Turnover [Text Block]

rr_PortfolioTurnoverTextBlock

The fund pays transaction costs, such as commissions, when it buys and sells securities (or "turns over" its portfolio). A higher portfolio turnover rate may indicate higher transaction costs and may result in higher taxes when fund shares are held in a taxable account. These costs, which are not reflected in annual operating expenses or in the example, affect the fund's performance. During the most recent fiscal year, the fund's portfolio turnover rate was 28% of the average value of its portfolio.

Portfolio Turnover, Rate

rr_PortfolioTurnoverRate

28.00%

Expense Breakpoint Discounts [Text]

rr_ExpenseBreakpointDiscounts

You may qualify for sales charge discounts if you and your family invest, or agree to invest in the future, at least $50,000 in the fund or certain other Fidelity® funds. More information about these and other discounts is available from your investment professional and in the Fund Distribution section beginning on page 27 of the prospectus.

Expense Breakpoint, Minimum Investment Required [Amount]

rr_ExpenseBreakpointMinimumInvestmentRequiredAmount

$ 50,000

Expense Example Narrative [Text Block]

rr_ExpenseExampleNarrativeTextBlock

This example helps compare the cost of investing in the fund with the cost of investing in other funds.

Let's say, hypothetically, that the annual return for shares of the fund is 5% and that your shareholder fees and the annual operating expenses for shares of the fund are exactly as described in the fee table. This example illustrates the effect of fees and expenses, but is not meant to suggest actual or expected fees and expenses or returns, all of which may vary. For every $10,000 you invested, here's how much you would pay in total expenses if you sell all of your shares at the end of each time period indicated and if you hold your shares:

Expense Example by, Year, Caption [Text]

rr_ExpenseExampleByYearCaption

Sell All Shares

Expense Example, No Redemption, By Year, Caption [Text]

rr_ExpenseExampleNoRedemptionByYearCaption

Hold Shares

Strategy [Heading]

rr_StrategyHeading

Principal Investment Strategies

Strategy Narrative [Text Block]

rr_StrategyNarrativeTextBlock

• Normally investing primarily in common stocks and in certain precious metals.

• Investing primarily in companies engaged in exploration, mining, processing, or dealing in gold, or to a lesser degree, in silver, platinum, diamonds, or other precious metals and minerals.

• Normally investing at least 80% of assets in securities of companies principally engaged in gold-related activities, and in gold bullion or coins.

• Investing up to 25% of assets in gold and other precious metals through a wholly-owned subsidiary.

• Potentially investing in other precious metals, instruments whose value is linked to the price of precious metals, and securities of companies that manufacture and distribute precious metal and minerals products (such as jewelry, watches, and metal foil and leaf) and companies that invest in other companies engaged in gold and other precious metal and mineral-related activities.

• Investing in domestic and foreign issuers.

• Using fundamental analysis of factors such as each issuer's financial condition and industry position, as well as market and economic conditions, to select investments.

Strategy Portfolio Concentration [Text]

rr_StrategyPortfolioConcentration

Normally investing at least 80% of assets in securities of companies principally engaged in gold-related activities, and in gold bullion or coins.

Risk [Heading]

rr_RiskHeading

Principal Investment Risks

Risk Narrative [Text Block]

rr_RiskNarrativeTextBlock

• Stock Market Volatility. Stock markets are volatile and can decline significantly in response to adverse issuer, political, regulatory, market, or economic developments. Different parts of the market, including different market sectors, and different types of securities can react differently to these developments.

• Foreign Exposure. Foreign markets, particularly emerging markets, can be more volatile than the U.S. market due to increased risks of adverse issuer, political, regulatory, market, or economic developments and can perform differently from the U.S. market. Emerging markets can be subject to greater social, economic, regulatory, and political uncertainties and can be extremely volatile. Foreign exchange rates also can be extremely volatile.

• Gold Industry Concentration. The gold industry can be significantly affected by international monetary and political developments such as currency devaluations or revaluations, central bank movements, economic and social conditions within a country, trade imbalances, or trade or currency restrictions between countries, as well as supply and demand for gold and operational costs associated with mining.

• Subsidiary Risk. Investment in an unregistered subsidiary is not subject to the investor protections of the Investment Company Act of 1940 (1940 Act) and is subject to the risks associated with the gold industry. Changes in tax and other laws could negatively affect investments in the subsidiary.

• Issuer-Specific Changes. The value of an individual security or particular type of security can be more volatile than, and can perform differently from, the market as a whole. The value of securities of smaller issuers can be more volatile than that of larger issuers.

In addition, the fund is considered non-diversified and can invest a greater portion of assets in securities of a smaller number of individual issuers than a diversified fund. As a result, changes in the market value of a single investment could cause greater fluctuations in share price than would occur in a more diversified fund.

An investment in the fund is not a deposit of a bank and is not insured or guaranteed by the Federal Deposit Insurance Corporation or any other government agency. You could lose money by investing in the fund.

Risk Lose Money [Text]

rr_RiskLoseMoney

You could lose money by investing in the fund.

Risk Nondiversified Status [Text]

rr_RiskNondiversifiedStatus

In addition, the fund is considered non-diversified and can invest a greater portion of assets in securities of a smaller number of individual issuers than a diversified fund. As a result, changes in the market value of a single investment could cause greater fluctuations in share price than would occur in a more diversified fund.

Risk Not Insured Depository Institution [Text]

rr_RiskNotInsuredDepositoryInstitution

An investment in the fund is not a deposit of a bank and is not insured or guaranteed by the Federal Deposit Insurance Corporation or any other government agency.

Bar Chart and Performance Table [Heading]

rr_BarChartAndPerformanceTableHeading

Performance

Performance Narrative [Text Block]

rr_PerformanceNarrativeTextBlock

The following information is intended to help you understand the risks of investing in the fund. The information illustrates the changes in the performance of the fund's shares from year to year and compares the performance of the fund's shares to the performance of a securities market index and an additional index over various periods of time. The indexes have characteristics relevant to the fund's investment strategies. Index descriptions appear in the Additional Index Information section of the prospectus. Past performance (before and after taxes) is not an indication of future performance.

Visit institutional.fidelity.com for more recent performance information.

Performance Information Illustrates Variability of Returns [Text]

rr_PerformanceInformationIllustratesVariabilityOfReturns

The information illustrates the changes in the performance of the fund's shares from year to year and compares the performance of the fund's shares to the performance of a securities market index and an additional index over various periods of time.

Performance Availability Website Address [Text]

rr_PerformanceAvailabilityWebSiteAddress

institutional.fidelity.com

Performance Past Does Not Indicate Future [Text]

rr_PerformancePastDoesNotIndicateFuture

Past performance (before and after taxes) is not an indication of future performance.

Bar Chart [Heading]

rr_BarChartHeading

Year-by-Year Returns

Calendar Years

Bar Chart Narrative [Text Block]

rr_BarChartNarrativeTextBlock

The returns in the bar chart do not reflect any applicable sales charges; if sales charges were reflected, returns would be lower than those shown.

Bar Chart Does Not Reflect Sales Loads [Text]

rr_BarChartDoesNotReflectSalesLoads

The returns in the bar chart do not reflect any applicable sales charges; if sales charges were reflected, returns would be lower than those shown.

Bar Chart Closing [Text Block]

rr_BarChartClosingTextBlock

During the periods shown in the chart for Class A:	Returns	Quarter ended
Highest Quarter Return	40.94%	March 31, 2016
Lowest Quarter Return	-37.42%	June 30, 2013
Year-to-Date Return	9.66%	March 31, 2017

Performance Table Heading

rr_PerformanceTableHeading

Average Annual Returns

Performance Table Does Reflect Sales Loads

rr_PerformanceTableDoesReflectSalesLoads

Unlike the returns in the bar chart, the returns in the table reflect the maximum applicable sales charges.

Performance Table Uses Highest Federal Rate

rr_PerformanceTableUsesHighestFederalRate

After-tax returns are calculated using the historical highest individual federal marginal income tax rates, but do not reflect the impact of state or local taxes.

Performance Table Not Relevant to Tax Deferred

rr_PerformanceTableNotRelevantToTaxDeferred

The after-tax returns shown are not relevant if you hold your shares in a retirement account or in another tax-deferred arrangement, such as an employee benefit plan (profit sharing, 401(k), or 403(b) plan).

Performance Table One Class of after Tax Shown [Text]

rr_PerformanceTableOneClassOfAfterTaxShown

After-tax returns for Class A are shown in the table below and after-tax returns for other classes will vary.

Performance Table Explanation after Tax Higher

rr_PerformanceTableExplanationAfterTaxHigher

Return After Taxes on Distributions and Sale of Fund Shares may be higher than other returns for the same period due to a tax benefit of realizing a capital loss upon the sale of fund shares.

Performance Table Narrative

rr_PerformanceTableNarrativeTextBlock

Unlike the returns in the bar chart, the returns in the table reflect the maximum applicable sales charges. After-tax returns are calculated using the historical highest individual federal marginal income tax rates, but do not reflect the impact of state or local taxes. After-tax returns for Class A are shown in the table below and after-tax returns for other classes will vary. Actual after-tax returns may differ depending on your individual circumstances. The after-tax returns shown are not relevant if you hold your shares in a retirement account or in another tax-deferred arrangement, such as an employee benefit plan (profit sharing, 401(k), or 403(b) plan). Return After Taxes on Distributions and Sale of Fund Shares may be higher than other returns for the same period due to a tax benefit of realizing a capital loss upon the sale of fund shares.

For the periods ended December 31, 2016

02.28 Select Portfolios: Fidelity Advisor Gold Fund - AMCI PRO-03 | Gold Portfolio | Gold Portfolio-Class A

Risk/Return:

rr_RiskReturnAbstract

Maximum sales charge (load) on purchases (as a % of offering price)

rr_MaximumCumulativeSalesChargeOverOfferingPrice

5.75%

Maximum contingent deferred sales charge (as a % of the lesser of original purchase price or redemption proceeds)

rr_MaximumDeferredSalesChargeOverOther

none

^[1]

Management fee

rr_ManagementFeesOverAssets

0.55%

Distribution and/or Service (12b-1) fees

rr_DistributionAndService12b1FeesOverAssets

0.25%

Other expenses

rr_OtherExpensesOverAssets

0.35%

Acquired fund fees and expenses

rr_AcquiredFundFeesAndExpensesOverAssets

0.04%

^[2]

Total annual operating expenses

rr_ExpensesOverAssets

1.19%

Fee waiver and/or expense reimbursement

rr_FeeWaiverOrReimbursementOverAssets

0.03%

^[2]

Total annual operating expenses after fee waiver and/or expense reimbursement

rr_NetExpensesOverAssets

1.16%

Expenses Deferred Charges [Text Block]

rr_ExpensesDeferredChargesTextBlock

Class A and Class M purchases of $1 million or more will not be subject to a front-end sales charge. Such Class A and Class M purchases may be subject, upon redemption, to a contingent deferred sales charge (CDSC) of 1.00% or 0.25%, respectively.

1 year

rr_ExpenseExampleYear01

$ 686

3 years

rr_ExpenseExampleYear03

922

5 years

rr_ExpenseExampleYear05

1,177

10 years

rr_ExpenseExampleYear10

1,903

1 Year

rr_ExpenseExampleNoRedemptionYear01

686

3 Years

rr_ExpenseExampleNoRedemptionYear03

922

5 Years

rr_ExpenseExampleNoRedemptionYear05

1,177

10 Years

rr_ExpenseExampleNoRedemptionYear10

$ 1,903

2007

rr_AnnualReturn2007

24.50%

2008

rr_AnnualReturn2008

(20.77%)

2009

rr_AnnualReturn2009

37.68%

2010

rr_AnnualReturn2010

34.92%

2011

rr_AnnualReturn2011

(16.56%)

2012

rr_AnnualReturn2012

(12.63%)

2013

rr_AnnualReturn2013

(51.54%)

2014

rr_AnnualReturn2014

(8.83%)

2015

rr_AnnualReturn2015

(18.07%)

2016

rr_AnnualReturn2016

46.80%

Year to Date Return, Label

rr_YearToDateReturnLabel

Year-to-Date Return

Bar Chart, Year to Date Return, Date

rr_BarChartYearToDateReturnDate

Mar. 31, 2017

Bar Chart, Year to Date Return

rr_BarChartYearToDateReturn

9.66%

Highest Quarterly Return, Label

rr_HighestQuarterlyReturnLabel

Highest Quarter Return

Highest Quarterly Return, Date

rr_BarChartHighestQuarterlyReturnDate

Mar. 31, 2016

Highest Quarterly Return

rr_BarChartHighestQuarterlyReturn

40.94%

Lowest Quarterly Return, Label

rr_LowestQuarterlyReturnLabel

Lowest Quarter Return

Lowest Quarterly Return, Date

rr_BarChartLowestQuarterlyReturnDate

Jun. 30, 2013

Lowest Quarterly Return

rr_BarChartLowestQuarterlyReturn

(37.42%)

02.28 Select Portfolios: Fidelity Advisor Gold Fund - AMCI PRO-03 | Gold Portfolio | Gold Portfolio-Class M

Risk/Return:

rr_RiskReturnAbstract

Maximum sales charge (load) on purchases (as a % of offering price)

rr_MaximumCumulativeSalesChargeOverOfferingPrice

3.50%

Maximum contingent deferred sales charge (as a % of the lesser of original purchase price or redemption proceeds)

rr_MaximumDeferredSalesChargeOverOther

none

^[1]

Management fee

rr_ManagementFeesOverAssets

0.55%

Distribution and/or Service (12b-1) fees

rr_DistributionAndService12b1FeesOverAssets

0.50%

Other expenses

rr_OtherExpensesOverAssets

0.40%

Acquired fund fees and expenses

rr_AcquiredFundFeesAndExpensesOverAssets

0.04%

^[2]

Total annual operating expenses

rr_ExpensesOverAssets

1.49%

Fee waiver and/or expense reimbursement

rr_FeeWaiverOrReimbursementOverAssets

0.03%

^[2]

Total annual operating expenses after fee waiver and/or expense reimbursement

rr_NetExpensesOverAssets

1.46%

Expenses Deferred Charges [Text Block]

rr_ExpensesDeferredChargesTextBlock

Class A and Class M purchases of $1 million or more will not be subject to a front-end sales charge. Such Class A and Class M purchases may be subject, upon redemption, to a contingent deferred sales charge (CDSC) of 1.00% or 0.25%, respectively.

1 year

rr_ExpenseExampleYear01

$ 493

3 years

rr_ExpenseExampleYear03

796

5 years

rr_ExpenseExampleYear05

1,120

10 years

rr_ExpenseExampleYear10

2,035

1 Year

rr_ExpenseExampleNoRedemptionYear01

493

3 Years

rr_ExpenseExampleNoRedemptionYear03

796

5 Years

rr_ExpenseExampleNoRedemptionYear05

1,120

10 Years

rr_ExpenseExampleNoRedemptionYear10

$ 2,035

02.28 Select Portfolios: Fidelity Advisor Gold Fund - AMCI PRO-03 | Gold Portfolio | Gold Portfolio-Class C

Risk/Return:

rr_RiskReturnAbstract

Maximum sales charge (load) on purchases (as a % of offering price)

rr_MaximumCumulativeSalesChargeOverOfferingPrice

none

Maximum contingent deferred sales charge (as a % of the lesser of original purchase price or redemption proceeds)

rr_MaximumDeferredSalesChargeOverOther

1.00%

^[3]

Management fee

rr_ManagementFeesOverAssets

0.55%

Distribution and/or Service (12b-1) fees

rr_DistributionAndService12b1FeesOverAssets

1.00%

Other expenses

rr_OtherExpensesOverAssets

0.29%

Acquired fund fees and expenses

rr_AcquiredFundFeesAndExpensesOverAssets

0.04%

^[2]

Total annual operating expenses

rr_ExpensesOverAssets

1.88%

Fee waiver and/or expense reimbursement

rr_FeeWaiverOrReimbursementOverAssets

0.03%

^[2]

Total annual operating expenses after fee waiver and/or expense reimbursement

rr_NetExpensesOverAssets

1.85%

Expenses Deferred Charges [Text Block]

rr_ExpensesDeferredChargesTextBlock

On Class C shares redeemed less than one year after purchase.

1 year

rr_ExpenseExampleYear01

$ 288

3 years

rr_ExpenseExampleYear03

582

5 years

rr_ExpenseExampleYear05

1,001

10 years

rr_ExpenseExampleYear10

2,169

1 Year

rr_ExpenseExampleNoRedemptionYear01

188

3 Years

rr_ExpenseExampleNoRedemptionYear03

582

5 Years

rr_ExpenseExampleNoRedemptionYear05

1,001

10 Years

rr_ExpenseExampleNoRedemptionYear10

$ 2,169

02.28 Select Portfolios: Fidelity Advisor Gold Fund - AMCI PRO-03 | Gold Portfolio | Gold Portfolio - Class I

Risk/Return:

rr_RiskReturnAbstract

Maximum sales charge (load) on purchases (as a % of offering price)

rr_MaximumCumulativeSalesChargeOverOfferingPrice

none

Maximum contingent deferred sales charge (as a % of the lesser of original purchase price or redemption proceeds)

rr_MaximumDeferredSalesChargeOverOther

none

Management fee

rr_ManagementFeesOverAssets

0.55%

Distribution and/or Service (12b-1) fees

rr_DistributionAndService12b1FeesOverAssets

none

Other expenses

rr_OtherExpensesOverAssets

0.28%

Acquired fund fees and expenses

rr_AcquiredFundFeesAndExpensesOverAssets

0.04%

^[2]

Total annual operating expenses

rr_ExpensesOverAssets

0.87%

Fee waiver and/or expense reimbursement

rr_FeeWaiverOrReimbursementOverAssets

0.03%

^[2]

Total annual operating expenses after fee waiver and/or expense reimbursement

rr_NetExpensesOverAssets

0.84%

1 year

rr_ExpenseExampleYear01

$ 86

3 years

rr_ExpenseExampleYear03

268

5 years

rr_ExpenseExampleYear05

466

10 years

rr_ExpenseExampleYear10

1,037

1 Year

rr_ExpenseExampleNoRedemptionYear01

86

3 Years

rr_ExpenseExampleNoRedemptionYear03

268

5 Years

rr_ExpenseExampleNoRedemptionYear05

466

10 Years

rr_ExpenseExampleNoRedemptionYear10

$ 1,037

02.28 Select Portfolios: Fidelity Advisor Gold Fund - AMCI PRO-03 | Gold Portfolio | Return Before Taxes | Gold Portfolio-Class A

Risk/Return:

rr_RiskReturnAbstract

Column

rr_AverageAnnualReturnColumnName

Gold Portfolio

Label

rr_AverageAnnualReturnLabel

Class A - Return Before Taxes

Past 1 year

rr_AverageAnnualReturnYear01

38.36%

Past 5 years

rr_AverageAnnualReturnYear05

(15.24%)

Past 10 years

rr_AverageAnnualReturnYear10

(3.94%)

02.28 Select Portfolios: Fidelity Advisor Gold Fund - AMCI PRO-03 | Gold Portfolio | Return Before Taxes | Gold Portfolio-Class M

Risk/Return:

rr_RiskReturnAbstract

Column

rr_AverageAnnualReturnColumnName

Gold Portfolio

Label

rr_AverageAnnualReturnLabel

Class M - Return Before Taxes

Past 1 year

rr_AverageAnnualReturnYear01

41.23%

Past 5 years

rr_AverageAnnualReturnYear05

(15.07%)

Past 10 years

rr_AverageAnnualReturnYear10

(3.96%)

02.28 Select Portfolios: Fidelity Advisor Gold Fund - AMCI PRO-03 | Gold Portfolio | Return Before Taxes | Gold Portfolio-Class C

Risk/Return:

rr_RiskReturnAbstract

Column

rr_AverageAnnualReturnColumnName

Gold Portfolio

Label

rr_AverageAnnualReturnLabel

Class C - Return Before Taxes

Past 1 year

rr_AverageAnnualReturnYear01

44.74%

Past 5 years

rr_AverageAnnualReturnYear05

(14.86%)

Past 10 years

rr_AverageAnnualReturnYear10

(4.09%)

02.28 Select Portfolios: Fidelity Advisor Gold Fund - AMCI PRO-03 | Gold Portfolio | Return Before Taxes | Gold Portfolio - Class I

Risk/Return:

rr_RiskReturnAbstract

Column

rr_AverageAnnualReturnColumnName

Gold Portfolio

Label

rr_AverageAnnualReturnLabel

Class I - Return Before Taxes

Past 1 year

rr_AverageAnnualReturnYear01

47.29%

Past 5 years

rr_AverageAnnualReturnYear05

(13.94%)

Past 10 years

rr_AverageAnnualReturnYear10

(3.06%)

02.28 Select Portfolios: Fidelity Advisor Gold Fund - AMCI PRO-03 | Gold Portfolio | After Taxes on Distributions | Gold Portfolio-Class A

Risk/Return:

rr_RiskReturnAbstract

Column

rr_AverageAnnualReturnColumnName

Gold Portfolio

Label

rr_AverageAnnualReturnLabel

Return After Taxes on Distributions

Past 1 year

rr_AverageAnnualReturnYear01

36.63%

Past 5 years

rr_AverageAnnualReturnYear05

(15.45%)

Past 10 years

rr_AverageAnnualReturnYear10

(4.71%)

02.28 Select Portfolios: Fidelity Advisor Gold Fund - AMCI PRO-03 | Gold Portfolio | After Taxes on Distributions and Sales | Gold Portfolio-Class A

Risk/Return:

rr_RiskReturnAbstract

Column

rr_AverageAnnualReturnColumnName

Gold Portfolio

Label

rr_AverageAnnualReturnLabel

Return After Taxes on Distributions and Sale of Fund Shares

Past 1 year

rr_AverageAnnualReturnYear01

21.89%

Past 5 years

rr_AverageAnnualReturnYear05

(10.66%)

Past 10 years

rr_AverageAnnualReturnYear10

(2.46%)

02.28 Select Portfolios: Fidelity Advisor Gold Fund - AMCI PRO-03 | Gold Portfolio | S&P 500® Index(reflects no deduction for fees, expenses, or taxes)

Risk/Return:

rr_RiskReturnAbstract

Past 1 year

rr_AverageAnnualReturnYear01

11.96%

Past 5 years

rr_AverageAnnualReturnYear05

14.66%

Past 10 years

rr_AverageAnnualReturnYear10

6.95%

02.28 Select Portfolios: Fidelity Advisor Gold Fund - AMCI PRO-03 | Gold Portfolio | S&P® Global BMI Gold Capped Index(reflects no deduction for fees, expenses, or taxes)

Risk/Return:

rr_RiskReturnAbstract

Past 1 year

rr_AverageAnnualReturnYear01

58.24%

Past 5 years

rr_AverageAnnualReturnYear05

(14.10%)

Past 10 years

rr_AverageAnnualReturnYear10

(4.20%)

[1] Class A and Class M purchases of $1 million or more will not be subject to a front-end sales charge. Such Class A and Class M purchases may be subject, upon redemption, to a contingent deferred sales charge (CDSC) of 1.00% or 0.25%, respectively.

[2] The fund may invest in a wholly-owned subsidiary. The subsidiary has entered into a separate contract with Fidelity Management & Research Company (FMR), an affiliate of Fidelity SelectCo, LLC (SelectCo), the fund's investment adviser, for the management of its portfolio pursuant to which the subsidiary pays FMR a fee at an annual rate of 0.30% of its net assets. The subsidiary also pays certain other expenses including custody fees. SelectCo has contractually agreed to waive the fund's management fee in an amount equal to the management fee paid to FMR by the subsidiary. This arrangement will remain in effect for at least one year from the effective date of the prospectus, and will remain in effect thereafter as long as FMR's contract with the subsidiary is in place. If FMR's contract with the subsidiary is terminated, SelectCo, in its sole discretion, may discontinue the arrangement.

[3] On Class C shares redeemed less than one year after purchase.

XML

Label	Element	Value
Risk/Return:	rr_RiskReturnAbstract
Registrant Name	dei_EntityRegistrantName	FIDELITY SELECT PORTFOLIOS
Prospectus Date	rr_ProspectusDate	Apr. 29, 2017
Document Creation Date	dei_DocumentCreationDate	Apr. 27, 2017