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Risk/Return: rr_RiskReturnAbstract  
Registrant Name dei_EntityRegistrantName FIDELITY SALEM STREET TRUST
Prospectus Date rr_ProspectusDate Nov. 29, 2019
NF_09.30 Fidelity Strategic Real Return Fund Class K6_Pro-02 | Fidelity Strategic Real Return Fund  
Risk/Return: rr_RiskReturnAbstract  
Risk/Return [Heading] rr_RiskReturnHeading <p style="font: bold 20pt Arial, Helvetica, sans-serif;">Fund Summary</p><p style="font: normal 12pt Arial, Helvetica, sans-serif;"><b>Fund/Class</b>:<br/><b>Fidelity® Strategic Real Return Fund</b>/K6</p>
Objective [Heading] rr_ObjectiveHeading <font style="font: bold 16pt Arial, Helvetica, sans-serif;">Investment Objective</font>
Objective, Primary [Text Block] rr_ObjectivePrimaryTextBlock

The fund seeks real return consistent with reasonable investment risk.
Expense [Heading] rr_ExpenseHeading <font style="font: bold 16pt Arial, Helvetica, sans-serif;"><b>Fee Table</b></font>
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 <p style="font: bold 11pt Arial, sans-serif; margin-bottom: 0px;">Shareholder fees</p><p style="font: bold 9pt Arial, sans-serif; margin-top: 0px"></p>
(fees paid directly from your investment) rr_ShareholderFeeOther none
Operating Expenses Caption [Text] rr_OperatingExpensesCaption <p style="font: bold 11pt Arial, sans-serif; margin-bottom: 0px;">Annual Operating Expenses</p><p style="font: bold 9pt Arial, sans-serif; margin-top: 0px">(expenses that you pay each year as a % of the value of your investment)</p>
Fee Waiver or Reimbursement over Assets, Date of Termination rr_FeeWaiverOrReimbursementOverAssetsDateOfTermination <font style="FONT-FAMILY: Times New Roman" size="3">January 31, 2021</font>
Portfolio Turnover [Heading] rr_PortfolioTurnoverHeading <font style="font: bold 16pt Arial, Helvetica, sans-serif;"><b>Portfolio Turnover</b></font>
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 19% of the average value of its portfolio.

Portfolio Turnover, Rate rr_PortfolioTurnoverRate 19.00%
Other Expenses, New Fund, Based on Estimates [Text] rr_OtherExpensesNewFundBasedOnEstimates <font style="FONT-FAMILY: Times New Roman" size="3">Based on estimated amounts for the current fiscal year.</font>
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 <p style="font: bold 9pt Arial, sans-serif; margin-top: 0px">Sell All Shares</p>
Strategy [Heading] rr_StrategyHeading <font style="font: bold 16pt Arial, Helvetica, sans-serif;"><b>Principal Investment Strategies</b></font>
Strategy Narrative [Text Block] rr_StrategyNarrativeTextBlock
  • Allocating the fund's assets in seeking real return (total return reduced by the expected impact of inflation) among four general investment categories: inflation-protected debt securities, floating rate loans (including lower-quality debt securities (those of less than investment-grade quality, also referred to as high yield debt securities or junk bonds)), commodity-linked derivative instruments and related investments, and Real Estate Investment Trusts (REITs) and other real estate related investments.
  • Using a neutral mix of approximately 30% inflation-protected debt securities (which attempts to track the Bloomberg Barclays U.S. Treasury Inflation-Protected Securities (TIPS) Index (Series-L), an index composed of inflation-protected debt securities issued by the U.S. Treasury), 25% floating rate loans, 25% commodity-linked derivative instruments and related investments, and 20% REITs and other real estate related investments.
  • Investing in domestic and foreign issuers.
  • Analyzing a security's structural features and current pricing, its issuer's potential for success, and the credit, currency, and economic risks of the security and its issuer to select investments.
  • 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.
  • Investing in Fidelity's central funds (specialized investment vehicles used by Fidelity® funds to invest in particular security types or investment disciplines).
Risk [Heading] rr_RiskHeading <font style="font: bold 16pt Arial, Helvetica, sans-serif;"><b>Principal Investment Risks</b></font>
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.
  • Floating Rate Loan Trading. A floating rate loan may not be fully collateralized which may cause the floating rate loan to decline significantly in value. Floating rate loans generally are subject to restrictions on resale. Floating rate loans sometimes trade infrequently in the secondary market. As a result, valuing a floating rate loan can be more difficult, and buying and selling a floating rate loan at an acceptable price can be more difficult or delayed. Difficulty in selling a floating rate loan can result in a loss.
  • Interest Rate Changes. Interest rate increases can cause the price of a debt security to decrease.
  • 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 Exposure. Changes in real estate values or economic downturns can have a significant negative effect on issuers in the real estate industry.
  • Prepayment. The ability of an issuer of a debt security to repay principal prior to a security's maturity can cause greater price volatility if interest rates change.
  • 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. A decline in the credit quality of an issuer or a provider of credit support or a maturity-shortening structure for a security can cause the price of a security to decrease. Lower-quality debt securities (those of less than investment-grade quality, also referred to as high yield debt securities or junk bonds) and certain types of other securities involve greater risk of default or price changes due to changes in the credit quality of the issuer. The value of lower-quality debt securities and certain types of other securities can be more volatile due to increased sensitivity to adverse issuer, political, regulatory, market, or economic developments and can be difficult to resell.
  • Passive Management Risk. A passive investment strategy attempts to track the performance of an unmanaged index of securities, regardless of the current or projected performance of the index or of the actual securities included in the index. This differs from an actively managed strategy, which typically seeks to outperform a benchmark index. As a result, the performance could be lower than actively managed strategies that may shift their portfolio assets to take advantage of market opportunities or lessen the impact of a market decline or a decline in the value of one or more issuers.
  • Leverage Risk. Leverage can increase market exposure, magnify investment risks, and cause losses to be realized more quickly.
  • Inflation-Protected Debt Exposure. Increases in real interest rates can cause the price of inflation-protected debt securities to decrease. Interest payments on inflation-protected debt securities can be unpredictable.
  • Commodity-Linked Investing. The value of commodities and commodity-linked investments may be affected by the performance of the overall commodities markets as well as weather, political, tax, and other regulatory and market developments. Commodity-linked investments may be more volatile and less liquid than the underlying commodity, instruments, or measures.
  • Commodity Futures. Investments in commodity futures contracts are also subject to the risk of the failure of any of the exchanges on which the fund’s positions trade or of its clearinghouses or counterparties. In addition, certain commodity exchanges limit fluctuations in certain futures contract prices during a single day by regulations referred to as "daily price fluctuation limits" or "daily limits." Under such daily limits, during a single trading day no trades may be executed at prices beyond the daily limit. If triggered, these limits could prevent the fund from liquidating unfavorable positions and subject the fund to losses or prevent it from entering into desired trades during the particular trading day.

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. Unlike individual debt securities, which typically pay principal at maturity, the value of an investment in the fund will fluctuate. You could lose money by investing in the fund.

Risk Lose Money [Text] rr_RiskLoseMoney <font style="FONT-FAMILY: Times New Roman" size="3">You could lose money by investing in the fund.</font>
Risk Not Insured Depository Institution [Text] rr_RiskNotInsuredDepositoryInstitution <font style="FONT-FAMILY: Times New Roman" size="3">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.</font>
Bar Chart and Performance Table [Heading] rr_BarChartAndPerformanceTableHeading <font style="font: bold 16pt Arial, Helvetica, sans-serif;"><b>Performance</b></font>
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 Fidelity® Strategic Real Return Fund, a class of shares of the fund, from year to year and compares the performance of this class to the performance of a securities market index and a hypothetical composite of market indexes 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 is not an indication of future performance.

Visit www.fidelity.com for more recent performance information for Fidelity® Strategic Real Return Fund, a class of shares of Fidelity® Strategic Real Return Fund.

Performance history will be available at www.401k.com (log in) for Class K6 after Class K6 has been in operation for one calendar year.
Performance Information Illustrates Variability of Returns [Text] rr_PerformanceInformationIllustratesVariabilityOfReturns <font style="FONT-FAMILY: Times New Roman" size="3">The information illustrates the changes in the performance of Fidelity® Strategic Real Return Fund, a class of shares of the fund, from year to year and compares the performance of this class to the performance of a securities market index and a hypothetical composite of market indexes over various periods of time.</font>
Performance Availability Website Address [Text] rr_PerformanceAvailabilityWebSiteAddress <font style="FONT-FAMILY: Times New Roman" size="3">Visit www.fidelity.com </font>
Performance Past Does Not Indicate Future [Text] rr_PerformancePastDoesNotIndicateFuture <font style="FONT-FAMILY: Times New Roman" size="3">Past performance is not an indication of future performance.</font>
Bar Chart [Heading] rr_BarChartHeading <p style="font:bold 11pt Arial, sans-serif; margin-bottom: 0px;">Year-by-Year Returns*</p><p style="font: bold 9pt Arial, sans-serif; margin-top: 0px">Calendar Years</p>
Bar Chart Closing [Text Block] rr_BarChartClosingTextBlock
During the periods shown in the chart:ReturnsQuarter ended
Highest Quarter Return13.00%June 30, 2009
Lowest Quarter Return-5.19%September 30, 2011
Year-to-Date Return8.71%September 30, 2019
Bar Chart, Returns for Class Not Offered in Prospectus [Text] rr_BarChartReturnsForClassNotOfferedInProspectus <font style="FONT-FAMILY: Times New Roman" size="3">* The returns shown above are for Fidelity® Strategic Real Return Fund, a class of shares of the fund that is not offered through this prospectus. Class K6 would have substantially similar annual returns to Fidelity® Strategic Real Return Fund because the classes are invested in the same portfolio of securities. Class K6's returns would differ from Fidelity® Strategic Real Return Fund's returns only to the extent that the classes do not have the same expenses.</font>
Performance Table Heading rr_PerformanceTableHeading <font style="font: bold 16pt Arial, Helvetica, sans-serif;"><b>Average Annual Returns*</b></font>
Performance Table Narrative rr_PerformanceTableNarrativeTextBlock

For the periods ended December 31, 2018

* The returns shown above are for Fidelity® Strategic Real Return Fund, a class of shares of the fund that is not offered through this prospectus. Class K6 would have substantially similar annual returns to Fidelity® Strategic Real Return Fund because the classes are invested in the same portfolio of securities. Class K6's returns would differ from Fidelity® Strategic Real Return Fund's returns only to the extent that the classes do not have the same expenses.
NF_09.30 Fidelity Strategic Real Return Fund Class K6_Pro-02 | Fidelity Strategic Real Return Fund | Class K6  
Risk/Return: rr_RiskReturnAbstract  
Management fee rr_ManagementFeesOverAssets 0.55%
Distribution and/or Service (12b-1) fees rr_DistributionAndService12b1FeesOverAssets none
Other expenses rr_OtherExpensesOverAssets 0.11% [1]
Total annual operating expenses rr_ExpensesOverAssets 0.66%
Fee waiver and/or expense reimbursement rr_FeeWaiverOrReimbursementOverAssets 0.10% [2]
Total annual operating expenses after fee waiver and/or expense reimbursement rr_NetExpensesOverAssets 0.56%
1 year rr_ExpenseExampleYear01 $ 56
3 years rr_ExpenseExampleYear03 196
5 years rr_ExpenseExampleYear05 353
10 years rr_ExpenseExampleYear10 $ 808
NF_09.30 Fidelity Strategic Real Return Fund Class K6_Pro-02 | Fidelity Strategic Real Return Fund | Fidelity Strategic Real Return Fund  
Risk/Return: rr_RiskReturnAbstract  
2009 rr_AnnualReturn2009 28.41%
2010 rr_AnnualReturn2010 13.94%
2011 rr_AnnualReturn2011 1.68%
2012 rr_AnnualReturn2012 8.18%
2013 rr_AnnualReturn2013 (2.15%)
2014 rr_AnnualReturn2014 1.13%
2015 rr_AnnualReturn2015 (7.43%)
2016 rr_AnnualReturn2016 9.09%
2017 rr_AnnualReturn2017 4.08%
2018 rr_AnnualReturn2018 (4.01%)
Year to Date Return, Label rr_YearToDateReturnLabel Year-to-Date Return
Bar Chart, Year to Date Return, Date rr_BarChartYearToDateReturnDate Sep. 30, 2019
Bar Chart, Year to Date Return rr_BarChartYearToDateReturn 8.71%
Highest Quarterly Return, Label rr_HighestQuarterlyReturnLabel Highest Quarter Return
Highest Quarterly Return, Date rr_BarChartHighestQuarterlyReturnDate Jun. 30, 2009
Highest Quarterly Return rr_BarChartHighestQuarterlyReturn 13.00%
Lowest Quarterly Return, Label rr_LowestQuarterlyReturnLabel Lowest Quarter Return
Lowest Quarterly Return, Date rr_BarChartLowestQuarterlyReturnDate Sep. 30, 2011
Lowest Quarterly Return rr_BarChartLowestQuarterlyReturn (5.19%)
NF_09.30 Fidelity Strategic Real Return Fund Class K6_Pro-02 | Fidelity Strategic Real Return Fund | Return Before Taxes | Fidelity Strategic Real Return Fund  
Risk/Return: rr_RiskReturnAbstract  
Column rr_AverageAnnualReturnColumnName Fidelity Strategic Real Return Fund
Label rr_AverageAnnualReturnLabel <font style="FONT-FAMILY: Times New Roman" ><b>Fidelity® Strategic Real Return Fund</b></font>
Past 1 year rr_AverageAnnualReturnYear01 (4.01%)
Past 5 years rr_AverageAnnualReturnYear05 0.40%
Past 10 years rr_AverageAnnualReturnYear10 4.86%
NF_09.30 Fidelity Strategic Real Return Fund Class K6_Pro-02 | Fidelity Strategic Real Return Fund | Bloomberg Barclays U.S. Treasury Inflation-Protected Securities (TIPS) Index (Series-L)(reflects no deduction for fees, expenses, or taxes)  
Risk/Return: rr_RiskReturnAbstract  
Past 1 year rr_AverageAnnualReturnYear01 (1.26%)
Past 5 years rr_AverageAnnualReturnYear05 1.69%
Past 10 years rr_AverageAnnualReturnYear10 3.64%
NF_09.30 Fidelity Strategic Real Return Fund Class K6_Pro-02 | Fidelity Strategic Real Return Fund | Fidelity Strategic Real Return Composite Index℠(reflects no deduction for fees, expenses, or taxes)  
Risk/Return: rr_RiskReturnAbstract  
Past 1 year rr_AverageAnnualReturnYear01 (3.47%)
Past 5 years rr_AverageAnnualReturnYear05 0.49%
Past 10 years rr_AverageAnnualReturnYear10 4.89%
[1] Based on estimated amounts for the current fiscal year.
[2] Fidelity Management & Research Company (FMR) has contractually agreed to reimburse Class K6 of the fund to the extent that total operating expenses (excluding interest, certain taxes, fees and expenses of the Independent Trustees, proxy and shareholder meeting expenses, extraordinary expenses, and acquired fund fees and expenses, if any, as well as non-operating expenses such as brokerage commissions and fees and expenses associated with the fund's securities lending program, if applicable), as a percentage of its average net assets, exceed 0.56% (the Expense Cap). If at any time during the current fiscal year expenses for Class K6 of the fund fall below the Expense Cap, FMR reserves the right to recoup through the end of the fiscal year any expenses that were reimbursed during the current fiscal year up to, but not in excess of, the Expense Cap. This arrangement will remain in effect through January 31, 2021. FMR may not terminate this arrangement before the expiration date without the approval of the Board of Trustees and may extend it in its discretion after that date.