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Risk/Return: rr_RiskReturnAbstract  
Registrant Name dei_EntityRegistrantName FIDELITY SELECT PORTFOLIOS
Prospectus Date rr_ProspectusDate Apr. 28, 2018
02.28 Select Portfolios: Fidelity Advisor Telecommunications Fund AMCI PRO-07 | Telecommunications Portfolio  
Risk/Return: rr_RiskReturnAbstract  
Risk/Return [Heading] rr_RiskReturnHeading

Fund Summary

Fund/Class:
Telecommunications Portfolio/Fidelity Advisor® Telecommunications Fund A, M, C, I
Objective [Heading] rr_ObjectiveHeading Investment Objective
Objective, Primary [Text Block] rr_ObjectivePrimaryTextBlock

The fund seeks capital appreciation.
Expense [Heading] rr_ExpenseHeading Fee Table
Expense Narrative [Text Block] rr_ExpenseNarrativeTextBlock

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

You may qualify for sales charge discounts if you and your family invest, or agree to invest in the future, at least $50,000 in the fund or certain other Fidelity® funds. More information about these and other discounts is available from your investment professional and in the "Fund Distribution" section beginning on page 27 of the prospectus. Different intermediaries may provide additional waivers or reductions of the sales charge. Please see “Sales Charge Waiver Policies Applied by Certain Intermediaries” in the “Appendix” section 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 66% of the average value of its portfolio.

Portfolio Turnover, Rate rr_PortfolioTurnoverRate 66.00%
Expense Breakpoint Discounts [Text] rr_ExpenseBreakpointDiscounts You may qualify for sales charge discounts if you and your family invest, or agree to invest in the future, at least $50,000 in the fund or certain other Fidelity® funds. More information about these and other discounts is available from your investment professional and in the "Fund Distribution" section beginning on page 27 of the prospectus.
Expense Breakpoint, Minimum Investment Required [Amount] rr_ExpenseBreakpointMinimumInvestmentRequiredAmount $ 50,000
Expense Example Narrative [Text Block] rr_ExpenseExampleNarrativeTextBlock

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

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

Expense Example by, Year, Caption [Text] rr_ExpenseExampleByYearCaption

Sell All Shares
Expense Example, No Redemption, By Year, Caption [Text] rr_ExpenseExampleNoRedemptionByYearCaption

Hold Shares
Strategy [Heading] rr_StrategyHeading Principal Investment Strategies
Strategy Narrative [Text Block] rr_StrategyNarrativeTextBlock
  • Normally investing primarily in common stocks.
  • Normally investing at least 80% of assets in securities of companies principally engaged in the development, manufacture, or sale of communications services or communications equipment.
  • Investing in domestic and foreign issuers.
  • Using fundamental analysis of factors such as each issuer's financial condition and industry position, as well as market and economic conditions, to select investments.
Strategy Portfolio Concentration [Text] rr_StrategyPortfolioConcentration Normally investing at least 80% of assets in securities of companies principally engaged in the development, manufacture, or sale of communications services or communications equipment.
Risk [Heading] rr_RiskHeading Principal Investment Risks
Risk Narrative [Text Block] rr_RiskNarrativeTextBlock
  • Stock Market Volatility. Stock markets are volatile and can decline significantly in response to adverse issuer, political, regulatory, market, or economic developments. Different parts of the market, including different market sectors, and different types of securities can react differently to these developments.
  • Foreign Exposure. Foreign markets can be more volatile than the U.S. market due to increased risks of adverse issuer, political, regulatory, market, or economic developments and can perform differently from the U.S. market.
  • Telecom Services Industry Concentration. The telecom services industry is subject to government regulation and can be significantly affected by intense competition and technology changes.
  • Issuer-Specific Changes. The value of an individual security or particular type of security can be more volatile than, and can perform differently from, the market as a whole. The value of securities of smaller issuers can be more volatile than that of larger issuers.

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

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

Risk Lose Money [Text] rr_RiskLoseMoney You could lose money by investing in the fund.
Risk Nondiversified Status [Text] rr_RiskNondiversifiedStatus In addition, the fund is considered non-diversified and can invest a greater portion of assets in securities of a smaller number of individual issuers than a diversified fund. As a result, changes in the market value of a single investment could cause greater fluctuations in share price than would occur in a more diversified fund.
Risk Not Insured Depository Institution [Text] rr_RiskNotInsuredDepositoryInstitution An investment in the fund is not a deposit of a bank and is not insured or guaranteed by the Federal Deposit Insurance Corporation or any other government agency.
Bar Chart and Performance Table [Heading] rr_BarChartAndPerformanceTableHeading Performance
Performance Narrative [Text Block] rr_PerformanceNarrativeTextBlock

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

Visit institutional.fidelity.com for more recent performance information.
Performance Information Illustrates Variability of Returns [Text] rr_PerformanceInformationIllustratesVariabilityOfReturns The information illustrates the changes in the performance of the fund's shares from year to year and compares the performance of the fund's shares to the performance of a securities market index and an additional index over various periods of time.
Performance Availability Website Address [Text] rr_PerformanceAvailabilityWebSiteAddress institutional.fidelity.com
Performance Past Does Not Indicate Future [Text] rr_PerformancePastDoesNotIndicateFuture Past performance (before and after taxes) is not an indication of future performance.
Bar Chart [Heading] rr_BarChartHeading

Year-by-Year Returns

Calendar Years
Bar Chart Narrative [Text Block] rr_BarChartNarrativeTextBlock

The returns in the bar chart do not reflect any applicable sales charges; if sales charges were reflected, returns would be lower than those shown.
Bar Chart Does Not Reflect Sales Loads [Text] rr_BarChartDoesNotReflectSalesLoads The returns in the bar chart do not reflect any applicable sales charges; if sales charges were reflected, returns would be lower than those shown.
Bar Chart Closing [Text Block] rr_BarChartClosingTextBlock
During the periods shown in the chart for Class A:ReturnsQuarter ended
Highest Quarter Return18.58%June 30, 2009
Lowest Quarter Return-22.06%December 31, 2008
Year-to-Date Return-6.43%March 31, 2018
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, 2017
02.28 Select Portfolios: Fidelity Advisor Telecommunications Fund AMCI PRO-07 | Telecommunications Portfolio | Telecommunications Portfolio-Class A  
Risk/Return: rr_RiskReturnAbstract  
Maximum sales charge (load) on purchases (as a % of offering price) rr_MaximumCumulativeSalesChargeOverOfferingPrice 5.75%
Maximum contingent deferred sales charge (as a % of the lesser of original purchase price or redemption proceeds) rr_MaximumDeferredSalesChargeOverOther none [1]
Management fee rr_ManagementFeesOverAssets 0.54%
Distribution and/or Service (12b-1) fees rr_DistributionAndService12b1FeesOverAssets 0.25%
Other expenses rr_OtherExpensesOverAssets 0.35%
Total annual operating expenses rr_ExpensesOverAssets 1.14%
Expenses Deferred Charges [Text Block] rr_ExpensesDeferredChargesTextBlock Class A and Class M purchases of $1 million or more will not be subject to a front-end sales charge. Such Class A and Class M purchases may be subject, upon redemption, to a contingent deferred sales charge (CDSC) of 1.00% or 0.25%, respectively.
1 year rr_ExpenseExampleYear01 $ 685
3 years rr_ExpenseExampleYear03 916
5 years rr_ExpenseExampleYear05 1,167
10 years rr_ExpenseExampleYear10 1,881
1 Year rr_ExpenseExampleNoRedemptionYear01 685
3 Years rr_ExpenseExampleNoRedemptionYear03 916
5 Years rr_ExpenseExampleNoRedemptionYear05 1,167
10 Years rr_ExpenseExampleNoRedemptionYear10 $ 1,881
2008 rr_AnnualReturn2008 (47.80%)
2009 rr_AnnualReturn2009 51.19%
2010 rr_AnnualReturn2010 18.01%
2011 rr_AnnualReturn2011 (4.52%)
2012 rr_AnnualReturn2012 18.27%
2013 rr_AnnualReturn2013 21.12%
2014 rr_AnnualReturn2014 3.27%
2015 rr_AnnualReturn2015 1.96%
2016 rr_AnnualReturn2016 22.39%
2017 rr_AnnualReturn2017 1.37%
Year to Date Return, Label rr_YearToDateReturnLabel Year-to-Date Return
Bar Chart, Year to Date Return, Date rr_BarChartYearToDateReturnDate Mar. 31, 2018
Bar Chart, Year to Date Return rr_BarChartYearToDateReturn (6.43%)
Highest Quarterly Return, Label rr_HighestQuarterlyReturnLabel Highest Quarter Return
Highest Quarterly Return, Date rr_BarChartHighestQuarterlyReturnDate Jun. 30, 2009
Highest Quarterly Return rr_BarChartHighestQuarterlyReturn 18.58%
Lowest Quarterly Return, Label rr_LowestQuarterlyReturnLabel Lowest Quarter Return
Lowest Quarterly Return, Date rr_BarChartLowestQuarterlyReturnDate Dec. 31, 2008
Lowest Quarterly Return rr_BarChartLowestQuarterlyReturn (22.06%)
02.28 Select Portfolios: Fidelity Advisor Telecommunications Fund AMCI PRO-07 | Telecommunications Portfolio | Telecommunications Portfolio-Class M  
Risk/Return: rr_RiskReturnAbstract  
Maximum sales charge (load) on purchases (as a % of offering price) rr_MaximumCumulativeSalesChargeOverOfferingPrice 3.50%
Maximum contingent deferred sales charge (as a % of the lesser of original purchase price or redemption proceeds) rr_MaximumDeferredSalesChargeOverOther none [1]
Management fee rr_ManagementFeesOverAssets 0.54%
Distribution and/or Service (12b-1) fees rr_DistributionAndService12b1FeesOverAssets 0.50%
Other expenses rr_OtherExpensesOverAssets 0.45%
Total annual operating expenses rr_ExpensesOverAssets 1.49%
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 $ 496
3 years rr_ExpenseExampleYear03 805
5 years rr_ExpenseExampleYear05 1,135
10 years rr_ExpenseExampleYear10 2,067
1 Year rr_ExpenseExampleNoRedemptionYear01 496
3 Years rr_ExpenseExampleNoRedemptionYear03 805
5 Years rr_ExpenseExampleNoRedemptionYear05 1,135
10 Years rr_ExpenseExampleNoRedemptionYear10 $ 2,067
02.28 Select Portfolios: Fidelity Advisor Telecommunications Fund AMCI PRO-07 | Telecommunications Portfolio | Telecommunications Portfolio-Class C  
Risk/Return: rr_RiskReturnAbstract  
Maximum sales charge (load) on purchases (as a % of offering price) rr_MaximumCumulativeSalesChargeOverOfferingPrice none
Maximum contingent deferred sales charge (as a % of the lesser of original purchase price or redemption proceeds) rr_MaximumDeferredSalesChargeOverOther 1.00% [2]
Management fee rr_ManagementFeesOverAssets 0.54%
Distribution and/or Service (12b-1) fees rr_DistributionAndService12b1FeesOverAssets 1.00%
Other expenses rr_OtherExpensesOverAssets 0.32%
Total annual operating expenses rr_ExpensesOverAssets 1.86%
Expenses Deferred Charges [Text Block] rr_ExpensesDeferredChargesTextBlock On Class C shares redeemed less than one year after purchase.
1 year rr_ExpenseExampleYear01 $ 289
3 years rr_ExpenseExampleYear03 585
5 years rr_ExpenseExampleYear05 1,006
10 years rr_ExpenseExampleYear10 2,180
1 Year rr_ExpenseExampleNoRedemptionYear01 189
3 Years rr_ExpenseExampleNoRedemptionYear03 585
5 Years rr_ExpenseExampleNoRedemptionYear05 1,006
10 Years rr_ExpenseExampleNoRedemptionYear10 $ 2,180
02.28 Select Portfolios: Fidelity Advisor Telecommunications Fund AMCI PRO-07 | Telecommunications Portfolio | Telecommunications Portfolio - Class I  
Risk/Return: rr_RiskReturnAbstract  
Maximum sales charge (load) on purchases (as a % of offering price) rr_MaximumCumulativeSalesChargeOverOfferingPrice none
Maximum contingent deferred sales charge (as a % of the lesser of original purchase price or redemption proceeds) rr_MaximumDeferredSalesChargeOverOther none
Management fee rr_ManagementFeesOverAssets 0.54%
Distribution and/or Service (12b-1) fees rr_DistributionAndService12b1FeesOverAssets none
Other expenses rr_OtherExpensesOverAssets 0.28%
Total annual operating expenses rr_ExpensesOverAssets 0.82%
1 year rr_ExpenseExampleYear01 $ 84
3 years rr_ExpenseExampleYear03 262
5 years rr_ExpenseExampleYear05 455
10 years rr_ExpenseExampleYear10 1,014
1 Year rr_ExpenseExampleNoRedemptionYear01 84
3 Years rr_ExpenseExampleNoRedemptionYear03 262
5 Years rr_ExpenseExampleNoRedemptionYear05 455
10 Years rr_ExpenseExampleNoRedemptionYear10 $ 1,014
02.28 Select Portfolios: Fidelity Advisor Telecommunications Fund AMCI PRO-07 | Telecommunications Portfolio | Return Before Taxes | Telecommunications Portfolio-Class A  
Risk/Return: rr_RiskReturnAbstract  
Column rr_AverageAnnualReturnColumnName Telecommunications Portfolio
Label rr_AverageAnnualReturnLabel Class A - Return Before Taxes
Past 1 year rr_AverageAnnualReturnYear01 (4.46%)
Past 5 years rr_AverageAnnualReturnYear05 8.32%
Past 10 years rr_AverageAnnualReturnYear10 4.60%
02.28 Select Portfolios: Fidelity Advisor Telecommunications Fund AMCI PRO-07 | Telecommunications Portfolio | Return Before Taxes | Telecommunications Portfolio-Class M  
Risk/Return: rr_RiskReturnAbstract  
Column rr_AverageAnnualReturnColumnName Telecommunications Portfolio
Label rr_AverageAnnualReturnLabel Class M - Return Before Taxes
Past 1 year rr_AverageAnnualReturnYear01 (2.53%)
Past 5 years rr_AverageAnnualReturnYear05 8.49%
Past 10 years rr_AverageAnnualReturnYear10 4.53%
02.28 Select Portfolios: Fidelity Advisor Telecommunications Fund AMCI PRO-07 | Telecommunications Portfolio | Return Before Taxes | Telecommunications Portfolio-Class C  
Risk/Return: rr_RiskReturnAbstract  
Column rr_AverageAnnualReturnColumnName Telecommunications Portfolio
Label rr_AverageAnnualReturnLabel Class C - Return Before Taxes
Past 1 year rr_AverageAnnualReturnYear01 (0.22%)
Past 5 years rr_AverageAnnualReturnYear05 8.82%
Past 10 years rr_AverageAnnualReturnYear10 4.46%
02.28 Select Portfolios: Fidelity Advisor Telecommunications Fund AMCI PRO-07 | Telecommunications Portfolio | Return Before Taxes | Telecommunications Portfolio - Class I  
Risk/Return: rr_RiskReturnAbstract  
Column rr_AverageAnnualReturnColumnName Telecommunications Portfolio
Label rr_AverageAnnualReturnLabel Class I - Return Before Taxes
Past 1 year rr_AverageAnnualReturnYear01 1.68%
Past 5 years rr_AverageAnnualReturnYear05 9.95%
Past 10 years rr_AverageAnnualReturnYear10 5.55%
02.28 Select Portfolios: Fidelity Advisor Telecommunications Fund AMCI PRO-07 | Telecommunications Portfolio | After Taxes on Distributions | Telecommunications Portfolio-Class A  
Risk/Return: rr_RiskReturnAbstract  
Column rr_AverageAnnualReturnColumnName Telecommunications Portfolio
Label rr_AverageAnnualReturnLabel Return After Taxes on Distributions
Past 1 year rr_AverageAnnualReturnYear01 (8.33%)
Past 5 years rr_AverageAnnualReturnYear05 6.68%
Past 10 years rr_AverageAnnualReturnYear10 3.70%
02.28 Select Portfolios: Fidelity Advisor Telecommunications Fund AMCI PRO-07 | Telecommunications Portfolio | After Taxes on Distributions and Sales | Telecommunications Portfolio-Class A  
Risk/Return: rr_RiskReturnAbstract  
Column rr_AverageAnnualReturnColumnName Telecommunications Portfolio
Label rr_AverageAnnualReturnLabel Return After Taxes on Distributions and Sale of Fund Shares
Past 1 year rr_AverageAnnualReturnYear01 0.61%
Past 5 years rr_AverageAnnualReturnYear05 6.39%
Past 10 years rr_AverageAnnualReturnYear10 3.57%
02.28 Select Portfolios: Fidelity Advisor Telecommunications Fund AMCI PRO-07 | Telecommunications Portfolio | S&P 500® Index(reflects no deduction for fees, expenses, or taxes)  
Risk/Return: rr_RiskReturnAbstract  
Past 1 year rr_AverageAnnualReturnYear01 21.83%
Past 5 years rr_AverageAnnualReturnYear05 15.79%
Past 10 years rr_AverageAnnualReturnYear10 8.50%
02.28 Select Portfolios: Fidelity Advisor Telecommunications Fund AMCI PRO-07 | Telecommunications Portfolio | MSCI U.S. IMI Telecommunications Services 25-50 Index(reflects no deduction for fees, expenses, or taxes)  
Risk/Return: rr_RiskReturnAbstract  
Past 1 year rr_AverageAnnualReturnYear01 (5.71%)
Past 5 years rr_AverageAnnualReturnYear05 8.93%
Past 10 years rr_AverageAnnualReturnYear10 4.63%
[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.