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.  _133_

and

REGISTRATION STATEMENT UNDER THE INVESTMENT COMPANY ACT OF 1940 x

x Amendment No.  _133_

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. 133to 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 17th day of October 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	October 17, 2017
Adrien E. Deberghes		(Principal Executive Officer)
/s/Howard J. Galligan III		Chief Financial Officer	October 17, 2017
Howard J. Galligan III		(Principal Financial Officer)
/s/Brian B. Hogan	*	Trustee	October 17, 2017
Brian B. Hogan
/s/David A. Rosow	*	Trustee	October 17, 2017
David A. Rosow
/s/Garnett A. Smith	*	Trustee	October 17, 2017
Garnett A. Smith
/s/Michael E. Wiley	*	Trustee	October 17, 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

Label	Element	Value
Risk/Return:	rr_RiskReturnAbstract
Document Type	dei_DocumentType	485BPOS
Document Period End Date	dei_DocumentPeriodEndDate	Jul. 31, 2017
Registrant Name	dei_EntityRegistrantName	FIDELITY SELECT PORTFOLIOS
Central Index Key	dei_EntityCentralIndexKey	0000320351
Amendment Flag	dei_AmendmentFlag	false
Document Creation Date	dei_DocumentCreationDate	Sep. 27, 2017
Document Effective Date	dei_DocumentEffectiveDate	Sep. 29, 2017
Prospectus Date	rr_ProspectusDate	Sep. 29, 2017

XML

07.31 Fidelity International Real Estate Fund Retail PRO-04 | Fidelity® International Real Estate Fund

Fund Summary

Fund/Class:
Fidelity® International Real Estate Fund/Fidelity® International Real Estate Fund

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 {- Fidelity® International Real Estate Fund}	07.31 Fidelity International Real Estate Fund Retail PRO-04 Fidelity® International Real Estate Fund Fidelity International Real Estate Fund-Retail Class
Redemption fee on shares held less than 90 days (as a % of amount redeemed)	1.50%

Annual Operating Expenses

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

Annual Operating Expenses {- Fidelity® International Real Estate Fund}	07.31 Fidelity International Real Estate Fund Retail PRO-04 Fidelity® International Real Estate Fund Fidelity International Real Estate Fund-Retail Class
Management fee	0.70%
Distribution and/or Service (12b-1) fees	none
Other expenses	0.42%
Total annual operating expenses	1.12%

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 {- Fidelity® International Real Estate Fund}	07.31 Fidelity International Real Estate Fund Retail PRO-04 Fidelity® International Real Estate Fund Fidelity International Real Estate Fund-Retail Class USD ($)
1 year	$ 114
3 years	356
5 years	617
10 years	$ 1,363

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 non-U.S. securities.

• Normally investing primarily in common stocks.

• Normally investing at least 80% of assets in securities of companies principally engaged in the real estate industry and other real estate related investments.

• Allocating investments across different countries and regions.

• 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.

• Real Estate Industry Concentration. Changes in real estate values or economic downturns can have a significant negative effect on issuers in the real estate industry. The value of securities of issuers in the real estate industry can be affected by changes in real estate values and rental income, property taxes, interest rates, tax and regulatory requirements, and the management skill and creditworthiness of the issuer.

• 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.

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	35.18%	June 30, 2009
Lowest Quarter Return	-24.32%	December 31, 2008
Year-to-Date Return	14.86%	June 30, 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{- Fidelity® International Real Estate Fund} - 07.31 Fidelity International Real Estate Fund Retail PRO-04 - Fidelity® International Real Estate Fund	Past 1 year	Past 5 years	Past 10 years
Fidelity International Real Estate Fund-Retail Class | Return Before Taxes	(1.56%)	11.12%	(0.72%)
Fidelity International Real Estate Fund-Retail Class | After Taxes on Distributions	(2.92%)	9.49%	(2.23%)
Fidelity International Real Estate Fund-Retail Class | After Taxes on Distributions and Sales	(0.57%)	8.27%	(1.00%)
MSCI EAFE Index(reflects no deduction for fees or expenses)	1.21%	6.69%	0.90%
FTSE® EPRA℠/NAREIT® Developed ex North America Index(reflects no deduction for fees, expenses, or taxes)	0.85%	9.15%	(0.08%)

XML

Label

Element

Value

Risk/Return:

rr_RiskReturnAbstract

Registrant Name

dei_EntityRegistrantName

FIDELITY SELECT PORTFOLIOS

Prospectus Date

rr_ProspectusDate

Sep. 29, 2017

07.31 Fidelity International Real Estate Fund Retail PRO-04 | Fidelity® International Real Estate Fund

Risk/Return:

rr_RiskReturnAbstract

Risk/Return [Heading]

rr_RiskReturnHeading

Fund Summary

Fund/Class:
Fidelity® International Real Estate Fund/Fidelity® International Real Estate Fund

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 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 non-U.S. securities.

• Normally investing primarily in common stocks.

• Normally investing at least 80% of assets in securities of companies principally engaged in the real estate industry and other real estate related investments.

• Allocating investments across different countries and regions.

• 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 real estate industry and other real estate related 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, 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.

• Real Estate Industry Concentration. Changes in real estate values or economic downturns can have a significant negative effect on issuers in the real estate industry. The value of securities of issuers in the real estate industry can be affected by changes in real estate values and rental income, property taxes, interest rates, tax and regulatory requirements, and the management skill and creditworthiness of the issuer.

• 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.

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	35.18%	June 30, 2009
Lowest Quarter Return	-24.32%	December 31, 2008
Year-to-Date Return	14.86%	June 30, 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

07.31 Fidelity International Real Estate Fund Retail PRO-04 | Fidelity® International Real Estate Fund | Fidelity International Real Estate Fund-Retail Class

Risk/Return:

rr_RiskReturnAbstract

Redemption fee on shares held less than 90 days (as a % of amount redeemed)

rr_RedemptionFeeOverRedemption

1.50%

Management fee

rr_ManagementFeesOverAssets

0.70%

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

rr_DistributionAndService12b1FeesOverAssets

none

Other expenses

rr_OtherExpensesOverAssets

0.42%

Total annual operating expenses

rr_ExpensesOverAssets

1.12%

1 year

rr_ExpenseExampleYear01

$ 114

3 years

rr_ExpenseExampleYear03

356

5 years

rr_ExpenseExampleYear05

617

10 years

rr_ExpenseExampleYear10

$ 1,363

2007

rr_AnnualReturn2007

(8.25%)

2008

rr_AnnualReturn2008

(50.52%)

2009

rr_AnnualReturn2009

35.82%

2010

rr_AnnualReturn2010

14.53%

2011

rr_AnnualReturn2011

(22.24%)

2012

rr_AnnualReturn2012

44.16%

2013

rr_AnnualReturn2013

12.58%

2014

rr_AnnualReturn2014

4.21%

2015

rr_AnnualReturn2015

1.79%

2016

rr_AnnualReturn2016

(1.56%)

Year to Date Return, Label

rr_YearToDateReturnLabel

Year-to-Date Return

Bar Chart, Year to Date Return, Date

rr_BarChartYearToDateReturnDate

Jun. 30, 2017

Bar Chart, Year to Date Return

rr_BarChartYearToDateReturn

14.86%

Highest Quarterly Return, Label

rr_HighestQuarterlyReturnLabel

Highest Quarter Return

Highest Quarterly Return, Date

rr_BarChartHighestQuarterlyReturnDate

Jun. 30, 2009

Highest Quarterly Return

rr_BarChartHighestQuarterlyReturn

35.18%

Lowest Quarterly Return, Label

rr_LowestQuarterlyReturnLabel

Lowest Quarter Return

Lowest Quarterly Return, Date

rr_BarChartLowestQuarterlyReturnDate

Dec. 31, 2008

Lowest Quarterly Return

rr_BarChartLowestQuarterlyReturn

(24.32%)

07.31 Fidelity International Real Estate Fund Retail PRO-04 | Fidelity® International Real Estate Fund | Return Before Taxes | Fidelity International Real Estate Fund-Retail Class

Risk/Return:

rr_RiskReturnAbstract

Column

rr_AverageAnnualReturnColumnName

Fidelity® International Real Estate Fund

Label

rr_AverageAnnualReturnLabel

Return Before Taxes

Past 1 year

rr_AverageAnnualReturnYear01

(1.56%)

Past 5 years

rr_AverageAnnualReturnYear05

11.12%

Past 10 years

rr_AverageAnnualReturnYear10

(0.72%)

07.31 Fidelity International Real Estate Fund Retail PRO-04 | Fidelity® International Real Estate Fund | After Taxes on Distributions | Fidelity International Real Estate Fund-Retail Class

Risk/Return:

rr_RiskReturnAbstract

Column

rr_AverageAnnualReturnColumnName

Fidelity® International Real Estate Fund

Label

rr_AverageAnnualReturnLabel

Return After Taxes on Distributions

Past 1 year

rr_AverageAnnualReturnYear01

(2.92%)

Past 5 years

rr_AverageAnnualReturnYear05

9.49%

Past 10 years

rr_AverageAnnualReturnYear10

(2.23%)

07.31 Fidelity International Real Estate Fund Retail PRO-04 | Fidelity® International Real Estate Fund | After Taxes on Distributions and Sales | Fidelity International Real Estate Fund-Retail Class

Risk/Return:

rr_RiskReturnAbstract

Column

rr_AverageAnnualReturnColumnName

Fidelity® International Real Estate Fund

Label

rr_AverageAnnualReturnLabel

Return After Taxes on Distributions and Sale of Fund Shares

Past 1 year

rr_AverageAnnualReturnYear01

(0.57%)

Past 5 years

rr_AverageAnnualReturnYear05

8.27%

Past 10 years

rr_AverageAnnualReturnYear10

(1.00%)

07.31 Fidelity International Real Estate Fund Retail PRO-04 | Fidelity® International Real Estate Fund | MSCI EAFE Index(reflects no deduction for fees or expenses)

Risk/Return:

rr_RiskReturnAbstract

Past 1 year

rr_AverageAnnualReturnYear01

1.21%

Past 5 years

rr_AverageAnnualReturnYear05

6.69%

Past 10 years

rr_AverageAnnualReturnYear10

0.90%

07.31 Fidelity International Real Estate Fund Retail PRO-04 | Fidelity® International Real Estate Fund | FTSE® EPRA℠/NAREIT® Developed ex North America Index(reflects no deduction for fees, expenses, or taxes)

Risk/Return:

rr_RiskReturnAbstract

Past 1 year

rr_AverageAnnualReturnYear01

0.85%

Past 5 years

rr_AverageAnnualReturnYear05

9.15%

Past 10 years

rr_AverageAnnualReturnYear10

(0.08%)

XML

07.31 Fidelity Flex Real Estate Fund PRO-03 | Fidelity Flex℠ Real Estate Fund

Fund Summary

Fund:
Fidelity Flex℠ Real Estate Fund

Investment Objective

The fund seeks above-average income and long-term capital growth, consistent with reasonable investment risk.

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 {- Fidelity Flex℠ Real Estate Fund}	07.31 Fidelity Flex Real Estate Fund PRO-03 Fidelity Flex℠ Real Estate Fund 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 {- Fidelity Flex℠ Real Estate Fund}	07.31 Fidelity Flex Real Estate Fund PRO-03 Fidelity Flex℠ Real Estate Fund Fidelity Flex Real Estate Fund-Default
Management fee	none
Distribution and/or Service (12b-1) fees	none
Other expenses	none	[1]
Total annual operating expenses	none	[2]

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. This example does not include any fees paid at the fee-based account or plan level. 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 {- Fidelity Flex℠ Real Estate Fund}	07.31 Fidelity Flex Real Estate Fund PRO-03 Fidelity Flex℠ Real Estate Fund Fidelity Flex Real Estate Fund-Default USD ($)
1 year	none
3 years	none

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. For the period from March 8, 2017 to July 31, 2017, the fund's portfolio turnover rate was 9% 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 real estate industry and other real estate related investments.

• 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.

• Real Estate Industry Concentration. Changes in real estate values or economic downturns can have a significant negative effect on issuers in the real estate industry. The value of securities of issuers in the real estate industry can be affected by changes in real estate values and rental income, property taxes, interest rates, tax and regulatory requirements, and the management skill and creditworthiness of the issuer.

• 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.

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

Performance history will be available for the fund after the fund has been in operation for one calendar year.

[1] Based on estimated amounts for the current fiscal year.

[2] The fund is available only to certain fee-based accounts offered by Fidelity. Retirement plans, plan sponsors and/or plan participants pay a wrap fee that covers investment advisory and administrative services.

XML

Label

Element

Value

Risk/Return:

rr_RiskReturnAbstract

Registrant Name

dei_EntityRegistrantName

FIDELITY SELECT PORTFOLIOS

Prospectus Date

rr_ProspectusDate

Sep. 29, 2017

07.31 Fidelity Flex Real Estate Fund PRO-03 | Fidelity Flex℠ Real Estate Fund

Risk/Return:

rr_RiskReturnAbstract

Risk/Return [Heading]

rr_RiskReturnHeading

Fund Summary

Fund:
Fidelity Flex℠ Real Estate Fund

Objective [Heading]

rr_ObjectiveHeading

Investment Objective

Objective, Primary [Text Block]

rr_ObjectivePrimaryTextBlock

The fund seeks above-average income and long-term capital growth, consistent with reasonable investment risk.

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. For the period from March 8, 2017 to July 31, 2017, the fund's portfolio turnover rate was 9% of the average value of its portfolio.

Portfolio Turnover, Rate

rr_PortfolioTurnoverRate

9.00%

Other Expenses, New Fund, Based on Estimates [Text]

rr_OtherExpensesNewFundBasedOnEstimates

Based on estimated amounts for the current fiscal year.

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. This example does not include any fees paid at the fee-based account or plan level. 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 real estate industry and other real estate related investments.

• 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 real estate industry and other real estate related 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.

• Real Estate Industry Concentration. Changes in real estate values or economic downturns can have a significant negative effect on issuers in the real estate industry. The value of securities of issuers in the real estate industry can be affected by changes in real estate values and rental income, property taxes, interest rates, tax and regulatory requirements, and the management skill and creditworthiness of the issuer.

• 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.

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

Performance history will be available for the fund after the fund has been in operation for one calendar year.

Performance One Year or Less [Text]

rr_PerformanceOneYearOrLess

Performance history will be available for the fund after the fund has been in operation for one calendar year.

07.31 Fidelity Flex Real Estate Fund PRO-03 | Fidelity Flex℠ Real Estate Fund | Fidelity Flex Real Estate Fund-Default

Risk/Return:

rr_RiskReturnAbstract

Management fee

rr_ManagementFeesOverAssets

none

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

rr_DistributionAndService12b1FeesOverAssets

none

Other expenses

rr_OtherExpensesOverAssets

none

^[1]

Total annual operating expenses

rr_ExpensesOverAssets

none

^[2]

1 year

rr_ExpenseExampleYear01

none

3 years

rr_ExpenseExampleYear03

none

[1] Based on estimated amounts for the current fiscal year.

[2] The fund is available only to certain fee-based accounts offered by Fidelity. Retirement plans, plan sponsors and/or plan participants pay a wrap fee that covers investment advisory and administrative services.

XML

07.31 Fidelity Real Estate Investment Portfolio PRO-04 | Fidelity® Real Estate Investment Portfolio

Fund Summary

Fund:
Fidelity® Real Estate Investment Portfolio

Investment Objective

The fund seeks above-average income and long-term capital growth, consistent with reasonable investment risk. The fund seeks to provide a yield that exceeds the composite yield of the S&P 500^® Index.

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 {- Fidelity® Real Estate Investment Portfolio}	07.31 Fidelity Real Estate Investment Portfolio PRO-04 Fidelity® Real Estate Investment 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 {- Fidelity® Real Estate Investment Portfolio}	07.31 Fidelity Real Estate Investment Portfolio PRO-04 Fidelity® Real Estate Investment Portfolio Fidelity Real Estate Investment 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 {- Fidelity® Real Estate Investment Portfolio}	07.31 Fidelity Real Estate Investment Portfolio PRO-04 Fidelity® Real Estate Investment Portfolio Fidelity Real Estate Investment 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 15% 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 real estate industry and other real estate related investments.

• 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.

• Real Estate Industry Concentration. Changes in real estate values or economic downturns can have a significant negative effect on issuers in the real estate industry. The value of securities of issuers in the real estate industry can be affected by changes in real estate values and rental income, property taxes, interest rates, tax and regulatory requirements, and the management skill and creditworthiness of the issuer.

• 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.

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	41.03%	September 30, 2009
Lowest Quarter Return	-37.43%	December 31, 2008
Year-to-Date Return	2.18%	June 30, 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{- Fidelity® Real Estate Investment Portfolio} - 07.31 Fidelity Real Estate Investment Portfolio PRO-04 - Fidelity® Real Estate Investment Portfolio	Past 1 year	Past 5 years	Past 10 years
Fidelity Real Estate Investment Portfolio-Default | Return Before Taxes	7.77%	12.23%	4.92%
Fidelity Real Estate Investment Portfolio-Default | After Taxes on Distributions	6.20%	11.01%	3.89%
Fidelity Real Estate Investment Portfolio-Default | After Taxes on Distributions and Sales	5.04%	9.32%	3.50%
S&P 500® Index(reflects no deduction for fees, expenses, or taxes)	11.96%	14.66%	6.95%
Dow Jones U.S. Select Real Estate Securities Index℠(reflects no deduction for fees, expenses, or taxes)	6.65%	11.75%	4.53%

XML

Label

Element

Value

Risk/Return:

rr_RiskReturnAbstract

Registrant Name

dei_EntityRegistrantName

FIDELITY SELECT PORTFOLIOS

Prospectus Date

rr_ProspectusDate

Sep. 29, 2017

07.31 Fidelity Real Estate Investment Portfolio PRO-04 | Fidelity® Real Estate Investment Portfolio

Risk/Return:

rr_RiskReturnAbstract

Risk/Return [Heading]

rr_RiskReturnHeading

Fund Summary

Fund:
Fidelity® Real Estate Investment Portfolio

Objective [Heading]

rr_ObjectiveHeading

Investment Objective

Objective, Primary [Text Block]

rr_ObjectivePrimaryTextBlock

The fund seeks above-average income and long-term capital growth, consistent with reasonable investment risk. The fund seeks to provide a yield that exceeds the composite yield of the S&P 500^® Index.

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 15% of the average value of its portfolio.

Portfolio Turnover, Rate

rr_PortfolioTurnoverRate

15.00%

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 real estate industry and other real estate related investments.

• 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 real estate industry and other real estate related 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.

• Real Estate Industry Concentration. Changes in real estate values or economic downturns can have a significant negative effect on issuers in the real estate industry. The value of securities of issuers in the real estate industry can be affected by changes in real estate values and rental income, property taxes, interest rates, tax and regulatory requirements, and the management skill and creditworthiness of the issuer.

• 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.

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	41.03%	September 30, 2009
Lowest Quarter Return	-37.43%	December 31, 2008
Year-to-Date Return	2.18%	June 30, 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

07.31 Fidelity Real Estate Investment Portfolio PRO-04 | Fidelity® Real Estate Investment Portfolio | Fidelity Real Estate Investment 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

(21.34%)

2008

rr_AnnualReturn2008

(38.21%)

2009

rr_AnnualReturn2009

32.89%

2010

rr_AnnualReturn2010

29.85%

2011

rr_AnnualReturn2011

8.29%

2012

rr_AnnualReturn2012

18.02%

2013

rr_AnnualReturn2013

1.53%

2014

rr_AnnualReturn2014

30.13%

2015

rr_AnnualReturn2015

5.95%

2016

rr_AnnualReturn2016

7.77%

Year to Date Return, Label

rr_YearToDateReturnLabel

Year-to-Date Return

Bar Chart, Year to Date Return, Date

rr_BarChartYearToDateReturnDate

Jun. 30, 2017

Bar Chart, Year to Date Return

rr_BarChartYearToDateReturn

2.18%

Highest Quarterly Return, Label

rr_HighestQuarterlyReturnLabel

Highest Quarter Return

Highest Quarterly Return, Date

rr_BarChartHighestQuarterlyReturnDate

Sep. 30, 2009

Highest Quarterly Return

rr_BarChartHighestQuarterlyReturn

41.03%

Lowest Quarterly Return, Label

rr_LowestQuarterlyReturnLabel

Lowest Quarter Return

Lowest Quarterly Return, Date

rr_BarChartLowestQuarterlyReturnDate

Dec. 31, 2008

Lowest Quarterly Return

rr_BarChartLowestQuarterlyReturn

(37.43%)

07.31 Fidelity Real Estate Investment Portfolio PRO-04 | Fidelity® Real Estate Investment Portfolio | Return Before Taxes | Fidelity Real Estate Investment Portfolio-Default

Risk/Return:

rr_RiskReturnAbstract

Column

rr_AverageAnnualReturnColumnName

Fidelity® Real Estate Investment Portfolio

Label

rr_AverageAnnualReturnLabel

Return Before Taxes

Past 1 year

rr_AverageAnnualReturnYear01

7.77%

Past 5 years

rr_AverageAnnualReturnYear05

12.23%

Past 10 years

rr_AverageAnnualReturnYear10

4.92%

07.31 Fidelity Real Estate Investment Portfolio PRO-04 | Fidelity® Real Estate Investment Portfolio | After Taxes on Distributions | Fidelity Real Estate Investment Portfolio-Default

Risk/Return:

rr_RiskReturnAbstract

Column

rr_AverageAnnualReturnColumnName

Fidelity® Real Estate Investment Portfolio

Label

rr_AverageAnnualReturnLabel

Return After Taxes on Distributions

Past 1 year

rr_AverageAnnualReturnYear01

6.20%

Past 5 years

rr_AverageAnnualReturnYear05

11.01%

Past 10 years

rr_AverageAnnualReturnYear10

3.89%

07.31 Fidelity Real Estate Investment Portfolio PRO-04 | Fidelity® Real Estate Investment Portfolio | After Taxes on Distributions and Sales | Fidelity Real Estate Investment Portfolio-Default

Risk/Return:

rr_RiskReturnAbstract

Column

rr_AverageAnnualReturnColumnName

Fidelity® Real Estate Investment Portfolio

Label

rr_AverageAnnualReturnLabel

Return After Taxes on Distributions and Sale of Fund Shares

Past 1 year

rr_AverageAnnualReturnYear01

5.04%

Past 5 years

rr_AverageAnnualReturnYear05

9.32%

Past 10 years

rr_AverageAnnualReturnYear10

3.50%

07.31 Fidelity Real Estate Investment Portfolio PRO-04 | Fidelity® Real Estate Investment 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%

07.31 Fidelity Real Estate Investment Portfolio PRO-04 | Fidelity® Real Estate Investment Portfolio | Dow Jones U.S. Select Real Estate Securities Index℠(reflects no deduction for fees, expenses, or taxes)

Risk/Return:

rr_RiskReturnAbstract

Past 1 year

rr_AverageAnnualReturnYear01

6.65%

Past 5 years

rr_AverageAnnualReturnYear05

11.75%

Past 10 years

rr_AverageAnnualReturnYear10

4.53%

XML

07.31 Fidelity International Real Estate Fund AMCI PRO-06 | Fidelity® International Real Estate Fund

Fund Summary

Fund/Class:
Fidelity® International Real Estate Fund/Fidelity Advisor® International Real Estate 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 29 of the prospectus.

Shareholder fees

(fees paid directly from your investment)

Shareholder Fees {- Fidelity® International Real Estate Fund} - 07.31 Fidelity International Real Estate Fund AMCI PRO-06 - Fidelity® International Real Estate Fund	Fidelity International Real Estate Fund-Class A		Fidelity International Real Estate Fund-Class M		Fidelity International Real Estate Fund-Class C		Fidelity International Real Estate Fund - 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
Redemption fee on shares held less than 90 days (as a % of amount redeemed)	1.50%		1.50%		1.50%		1.50%

Annual Operating Expenses

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

Annual Operating Expenses {- Fidelity® International Real Estate Fund} - 07.31 Fidelity International Real Estate Fund AMCI PRO-06 - Fidelity® International Real Estate Fund	Fidelity International Real Estate Fund-Class A	Fidelity International Real Estate Fund-Class M	Fidelity International Real Estate Fund-Class C	Fidelity International Real Estate Fund - Class I
Management fee	0.70%	0.70%	0.70%	0.70%
Distribution and/or Service (12b-1) fees	0.25%	0.50%	1.00%	none
Other expenses	0.40%	0.45%	0.39%	0.25%
Total annual operating expenses	1.35%	1.65%	2.09%	0.95%

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 {- Fidelity® International Real Estate Fund} - 07.31 Fidelity International Real Estate Fund AMCI PRO-06 - Fidelity® International Real Estate Fund - USD ($)	Fidelity International Real Estate Fund-Class A	Fidelity International Real Estate Fund-Class M	Fidelity International Real Estate Fund-Class C	Fidelity International Real Estate Fund - Class I
1 year	$ 705	$ 512	$ 312	$ 97
3 years	978	852	655	303
5 years	1,272	1,216	1,124	525
10 years	$ 2,105	$ 2,236	$ 2,421	$ 1,166

Hold Shares

Expense Example, No Redemption {- Fidelity® International Real Estate Fund} - 07.31 Fidelity International Real Estate Fund AMCI PRO-06 - Fidelity® International Real Estate Fund - USD ($)	Fidelity International Real Estate Fund-Class A	Fidelity International Real Estate Fund-Class M	Fidelity International Real Estate Fund-Class C	Fidelity International Real Estate Fund - Class I
1 Year	$ 705	$ 512	$ 212	$ 97
3 Years	978	852	655	303
5 Years	1,272	1,216	1,124	525
10 Years	$ 2,105	$ 2,236	$ 2,421	$ 1,166

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 non-U.S. securities.

• Normally investing primarily in common stocks.

• Normally investing at least 80% of assets in securities of companies principally engaged in the real estate industry and other real estate related investments.

• Allocating investments across different countries and regions.

• 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.

• Real Estate Industry Concentration. Changes in real estate values or economic downturns can have a significant negative effect on issuers in the real estate industry. The value of securities of issuers in the real estate industry can be affected by changes in real estate values and rental income, property taxes, interest rates, tax and regulatory requirements, and the management skill and creditworthiness of the issuer.

• 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.

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	35.25%	June 30, 2009
Lowest Quarter Return	-24.43%	December 31, 2008
Year-to-Date Return	14.71%	June 30, 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{- Fidelity® International Real Estate Fund} - 07.31 Fidelity International Real Estate Fund AMCI PRO-06 - Fidelity® International Real Estate Fund	Past 1 year	Past 5 years	Since Inception	[1]	Inception Date
Fidelity International Real Estate Fund-Class A					Apr. 04, 2007
Fidelity International Real Estate Fund-Class A | Return Before Taxes	(7.47%)	9.55%	(2.11%)
Fidelity International Real Estate Fund-Class A | After Taxes on Distributions	(8.70%)	8.01%	(3.59%)		Apr. 04, 2007
Fidelity International Real Estate Fund-Class A | After Taxes on Distributions and Sales	(3.93%)	7.03%	(1.99%)		Apr. 04, 2007
Fidelity International Real Estate Fund-Class M					Apr. 04, 2007
Fidelity International Real Estate Fund-Class M | Return Before Taxes	(5.62%)	9.75%	(2.15%)
Fidelity International Real Estate Fund-Class C					Apr. 04, 2007
Fidelity International Real Estate Fund-Class C | Return Before Taxes	(3.47%)	10.03%	(2.25%)
Fidelity International Real Estate Fund - Class I					Apr. 04, 2007
Fidelity International Real Estate Fund - Class I | Return Before Taxes	(1.47%)	11.20%	(1.24%)
MSCI EAFE Index(reflects no deduction for fees or expenses)	1.21%	6.69%	0.33%
FTSE® EPRA℠/NAREIT® Developed ex North America Index(reflects no deduction for fees, expenses, or taxes)	0.85%	9.15%	(0.98%)

07.31 Fidelity International Real Estate Fund AMCI PRO-06 | Fidelity® International Real Estate Fund | Fidelity International Real Estate Fund-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.

07.31 Fidelity International Real Estate Fund AMCI PRO-06 | Fidelity® International Real Estate Fund | Fidelity International Real Estate Fund-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.

07.31 Fidelity International Real Estate Fund AMCI PRO-06 | Fidelity® International Real Estate Fund | Fidelity International Real Estate Fund-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] From April 4, 2007

XML

Label

Element

Value

Risk/Return:

rr_RiskReturnAbstract

Registrant Name

dei_EntityRegistrantName

FIDELITY SELECT PORTFOLIOS

Prospectus Date

rr_ProspectusDate

Sep. 29, 2017

07.31 Fidelity International Real Estate Fund AMCI PRO-06 | Fidelity® International Real Estate Fund

Risk/Return:

rr_RiskReturnAbstract

Risk/Return [Heading]

rr_RiskReturnHeading

Fund Summary

Fund/Class:
Fidelity® International Real Estate Fund/Fidelity Advisor® International Real Estate 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 29 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 55% of the average value of its portfolio.

Portfolio Turnover, Rate

rr_PortfolioTurnoverRate

55.00%

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 29 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 non-U.S. securities.

• Normally investing primarily in common stocks.

• Normally investing at least 80% of assets in securities of companies principally engaged in the real estate industry and other real estate related investments.

• Allocating investments across different countries and regions.

• 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 real estate industry and other real estate related 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, 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.

• Real Estate Industry Concentration. Changes in real estate values or economic downturns can have a significant negative effect on issuers in the real estate industry. The value of securities of issuers in the real estate industry can be affected by changes in real estate values and rental income, property taxes, interest rates, tax and regulatory requirements, and the management skill and creditworthiness of the issuer.

• 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.

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	35.25%	June 30, 2009
Lowest Quarter Return	-24.43%	December 31, 2008
Year-to-Date Return	14.71%	June 30, 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

07.31 Fidelity International Real Estate Fund AMCI PRO-06 | Fidelity® International Real Estate Fund | Fidelity International Real Estate Fund-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]

Redemption fee on shares held less than 90 days (as a % of amount redeemed)

rr_RedemptionFeeOverRedemption

1.50%

Management fee

rr_ManagementFeesOverAssets

0.70%

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

rr_DistributionAndService12b1FeesOverAssets

0.25%

Other expenses

rr_OtherExpensesOverAssets

0.40%

Total annual operating expenses

rr_ExpensesOverAssets

1.35%

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

$ 705

3 years

rr_ExpenseExampleYear03

978

5 years

rr_ExpenseExampleYear05

1,272

10 years

rr_ExpenseExampleYear10

2,105

1 Year

rr_ExpenseExampleNoRedemptionYear01

705

3 Years

rr_ExpenseExampleNoRedemptionYear03

978

5 Years

rr_ExpenseExampleNoRedemptionYear05

1,272

10 Years

rr_ExpenseExampleNoRedemptionYear10

$ 2,105

2008

rr_AnnualReturn2008

(50.71%)

2009

rr_AnnualReturn2009

35.60%

2010

rr_AnnualReturn2010

14.24%

2011

rr_AnnualReturn2011

(22.43%)

2012

rr_AnnualReturn2012

43.78%

2013

rr_AnnualReturn2013

12.28%

2014

rr_AnnualReturn2014

3.94%

2015

rr_AnnualReturn2015

1.60%

2016

rr_AnnualReturn2016

(1.83%)

Year to Date Return, Label

rr_YearToDateReturnLabel

Year-to-Date Return

Bar Chart, Year to Date Return, Date

rr_BarChartYearToDateReturnDate

Jun. 30, 2017

Bar Chart, Year to Date Return

rr_BarChartYearToDateReturn

14.71%

Highest Quarterly Return, Label

rr_HighestQuarterlyReturnLabel

Highest Quarter Return

Highest Quarterly Return, Date

rr_BarChartHighestQuarterlyReturnDate

Jun. 30, 2009

Highest Quarterly Return

rr_BarChartHighestQuarterlyReturn

35.25%

Lowest Quarterly Return, Label

rr_LowestQuarterlyReturnLabel

Lowest Quarter Return

Lowest Quarterly Return, Date

rr_BarChartLowestQuarterlyReturnDate

Dec. 31, 2008

Lowest Quarterly Return

rr_BarChartLowestQuarterlyReturn

(24.43%)

Inception Date

rr_AverageAnnualReturnInceptionDate

Apr. 04, 2007

07.31 Fidelity International Real Estate Fund AMCI PRO-06 | Fidelity® International Real Estate Fund | Fidelity International Real Estate Fund-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]

Redemption fee on shares held less than 90 days (as a % of amount redeemed)

rr_RedemptionFeeOverRedemption

1.50%

Management fee

rr_ManagementFeesOverAssets

0.70%

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

rr_DistributionAndService12b1FeesOverAssets

0.50%

Other expenses

rr_OtherExpensesOverAssets

0.45%

Total annual operating expenses

rr_ExpensesOverAssets

1.65%

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

$ 512

3 years

rr_ExpenseExampleYear03

852

5 years

rr_ExpenseExampleYear05

1,216

10 years

rr_ExpenseExampleYear10

2,236

1 Year

rr_ExpenseExampleNoRedemptionYear01

512

3 Years

rr_ExpenseExampleNoRedemptionYear03

852

5 Years

rr_ExpenseExampleNoRedemptionYear05

1,216

10 Years

rr_ExpenseExampleNoRedemptionYear10

$ 2,236

Inception Date

rr_AverageAnnualReturnInceptionDate

Apr. 04, 2007

07.31 Fidelity International Real Estate Fund AMCI PRO-06 | Fidelity® International Real Estate Fund | Fidelity International Real Estate Fund-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]

Redemption fee on shares held less than 90 days (as a % of amount redeemed)

rr_RedemptionFeeOverRedemption

1.50%

Management fee

rr_ManagementFeesOverAssets

0.70%

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

rr_DistributionAndService12b1FeesOverAssets

1.00%

Other expenses

rr_OtherExpensesOverAssets

0.39%

Total annual operating expenses

rr_ExpensesOverAssets

2.09%

Expenses Deferred Charges [Text Block]

rr_ExpensesDeferredChargesTextBlock

On Class C shares redeemed less than one year after purchase.

1 year

rr_ExpenseExampleYear01

$ 312

3 years

rr_ExpenseExampleYear03

655

5 years

rr_ExpenseExampleYear05

1,124

10 years

rr_ExpenseExampleYear10

2,421

1 Year

rr_ExpenseExampleNoRedemptionYear01

212

3 Years

rr_ExpenseExampleNoRedemptionYear03

655

5 Years

rr_ExpenseExampleNoRedemptionYear05

1,124

10 Years

rr_ExpenseExampleNoRedemptionYear10

$ 2,421

Inception Date

rr_AverageAnnualReturnInceptionDate

Apr. 04, 2007

07.31 Fidelity International Real Estate Fund AMCI PRO-06 | Fidelity® International Real Estate Fund | Fidelity International Real Estate Fund - 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

Redemption fee on shares held less than 90 days (as a % of amount redeemed)

rr_RedemptionFeeOverRedemption

1.50%

Management fee

rr_ManagementFeesOverAssets

0.70%

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

rr_DistributionAndService12b1FeesOverAssets

none

Other expenses

rr_OtherExpensesOverAssets

0.25%

Total annual operating expenses

rr_ExpensesOverAssets

0.95%

1 year

rr_ExpenseExampleYear01

$ 97

3 years

rr_ExpenseExampleYear03

303

5 years

rr_ExpenseExampleYear05

525

10 years

rr_ExpenseExampleYear10

1,166

1 Year

rr_ExpenseExampleNoRedemptionYear01

97

3 Years

rr_ExpenseExampleNoRedemptionYear03

303

5 Years

rr_ExpenseExampleNoRedemptionYear05

525

10 Years

rr_ExpenseExampleNoRedemptionYear10

$ 1,166

Inception Date

rr_AverageAnnualReturnInceptionDate

Apr. 04, 2007

07.31 Fidelity International Real Estate Fund AMCI PRO-06 | Fidelity® International Real Estate Fund | Return Before Taxes | Fidelity International Real Estate Fund-Class A

Risk/Return:

rr_RiskReturnAbstract

Column

rr_AverageAnnualReturnColumnName

Fidelity® International Real Estate Fund

Label

rr_AverageAnnualReturnLabel

Class A - Return Before Taxes

Past 1 year

rr_AverageAnnualReturnYear01

(7.47%)

Past 5 years

rr_AverageAnnualReturnYear05

9.55%

Since Inception

rr_AverageAnnualReturnSinceInception

(2.11%)

^[3]

07.31 Fidelity International Real Estate Fund AMCI PRO-06 | Fidelity® International Real Estate Fund | Return Before Taxes | Fidelity International Real Estate Fund-Class M

Risk/Return:

rr_RiskReturnAbstract

Column

rr_AverageAnnualReturnColumnName

Fidelity® International Real Estate Fund

Label

rr_AverageAnnualReturnLabel

Class M - Return Before Taxes

Past 1 year

rr_AverageAnnualReturnYear01

(5.62%)

Past 5 years

rr_AverageAnnualReturnYear05

9.75%

Since Inception

rr_AverageAnnualReturnSinceInception

(2.15%)

^[3]

07.31 Fidelity International Real Estate Fund AMCI PRO-06 | Fidelity® International Real Estate Fund | Return Before Taxes | Fidelity International Real Estate Fund-Class C

Risk/Return:

rr_RiskReturnAbstract

Column

rr_AverageAnnualReturnColumnName

Fidelity® International Real Estate Fund

Label

rr_AverageAnnualReturnLabel

Class C - Return Before Taxes

Past 1 year

rr_AverageAnnualReturnYear01

(3.47%)

Past 5 years

rr_AverageAnnualReturnYear05

10.03%

Since Inception

rr_AverageAnnualReturnSinceInception

(2.25%)

^[3]

07.31 Fidelity International Real Estate Fund AMCI PRO-06 | Fidelity® International Real Estate Fund | Return Before Taxes | Fidelity International Real Estate Fund - Class I

Risk/Return:

rr_RiskReturnAbstract

Column

rr_AverageAnnualReturnColumnName

Fidelity® International Real Estate Fund

Label

rr_AverageAnnualReturnLabel

Class I - Return Before Taxes

Past 1 year

rr_AverageAnnualReturnYear01

(1.47%)

Past 5 years

rr_AverageAnnualReturnYear05

11.20%

Since Inception

rr_AverageAnnualReturnSinceInception

(1.24%)

^[3]

07.31 Fidelity International Real Estate Fund AMCI PRO-06 | Fidelity® International Real Estate Fund | After Taxes on Distributions | Fidelity International Real Estate Fund-Class A

Risk/Return:

rr_RiskReturnAbstract

Column

rr_AverageAnnualReturnColumnName

Fidelity® International Real Estate Fund

Label

rr_AverageAnnualReturnLabel

Return After Taxes on Distributions

Past 1 year

rr_AverageAnnualReturnYear01

(8.70%)

Past 5 years

rr_AverageAnnualReturnYear05

8.01%

Since Inception

rr_AverageAnnualReturnSinceInception

(3.59%)

^[3]

Inception Date

rr_AverageAnnualReturnInceptionDate

Apr. 04, 2007

07.31 Fidelity International Real Estate Fund AMCI PRO-06 | Fidelity® International Real Estate Fund | After Taxes on Distributions and Sales | Fidelity International Real Estate Fund-Class A

Risk/Return:

rr_RiskReturnAbstract

Column

rr_AverageAnnualReturnColumnName

Fidelity® International Real Estate Fund

Label

rr_AverageAnnualReturnLabel

Return After Taxes on Distributions and Sale of Fund Shares

Past 1 year

rr_AverageAnnualReturnYear01

(3.93%)

Past 5 years

rr_AverageAnnualReturnYear05

7.03%

Since Inception

rr_AverageAnnualReturnSinceInception

(1.99%)

^[3]

Inception Date

rr_AverageAnnualReturnInceptionDate

Apr. 04, 2007

07.31 Fidelity International Real Estate Fund AMCI PRO-06 | Fidelity® International Real Estate Fund | MSCI EAFE Index(reflects no deduction for fees or expenses)

Risk/Return:

rr_RiskReturnAbstract

Past 1 year

rr_AverageAnnualReturnYear01

1.21%

Past 5 years

rr_AverageAnnualReturnYear05

6.69%

Since Inception

rr_AverageAnnualReturnSinceInception

0.33%

^[3]

07.31 Fidelity International Real Estate Fund AMCI PRO-06 | Fidelity® International Real Estate Fund | FTSE® EPRA℠/NAREIT® Developed ex North America Index(reflects no deduction for fees, expenses, or taxes)

Risk/Return:

rr_RiskReturnAbstract

Past 1 year

rr_AverageAnnualReturnYear01

0.85%

Past 5 years

rr_AverageAnnualReturnYear05

9.15%

Since Inception

rr_AverageAnnualReturnSinceInception

(0.98%)

^[3]

[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.

[3] From April 4, 2007

XML

Label	Element	Value
Risk/Return:	rr_RiskReturnAbstract
Registrant Name	dei_EntityRegistrantName	FIDELITY SELECT PORTFOLIOS
Prospectus Date	rr_ProspectusDate	Sep. 29, 2017
Document Creation Date	dei_DocumentCreationDate	Sep. 27, 2017