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Risk/Return: rr_RiskReturnAbstract  
Registrant Name dei_EntityRegistrantName FIDELITY SALEM STREET TRUST
Prospectus Date rr_ProspectusDate Jul. 30, 2014
Inst | Fidelity Global Strategies Fund
  
Risk/Return: rr_RiskReturnAbstract  
Risk/Return [Heading] rr_RiskReturnHeading Fund Summary

Fund/Class:
Fidelity® Global Strategies Fund/Fidelity Advisor® Global Strategies Fund Institutional
Objective [Heading] rr_ObjectiveHeading Investment Objective
Objective, Primary [Text Block] rr_ObjectivePrimaryTextBlock The fund seeks to maximize total return.
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)
Fee Waiver or Reimbursement over Assets, Date of Termination rr_FeeWaiverOrReimbursementOverAssetsDateOfTermination July 31, 2015
Portfolio Turnover [Heading] rr_PortfolioTurnoverHeading Portfolio Turnover
Portfolio Turnover [Text Block] rr_PortfolioTurnoverTextBlock The fund will not incur transaction costs, such as commissions, when it buys and sells shares of underlying Fidelity funds, but it will incur transaction costs when it buys and sells other types of securities (including non-affiliated exchange traded funds) directly (or "turns over" its portfolio). A higher portfolio turnover rate may indicate higher transaction costs and may result in higher taxes when fund shares are held in a taxable account. These costs, which are not reflected in annual operating expenses or in the example, affect the fund's performance. During the most recent fiscal year, the fund's portfolio turnover rate was 106% of the average value of its portfolio.
Portfolio Turnover, Rate rr_PortfolioTurnoverRate 106.00%
Expenses Not Correlated to Ratio Due to Acquired Fund Fees [Text] rr_ExpensesNotCorrelatedToRatioDueToAcquiredFundFees Differs from the ratios of expenses to average net assets in the Financial Highlights section of the prospectus because of acquired fund fees and expenses.
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:
Strategy [Heading] rr_StrategyHeading Principal Investment Strategies
Strategy Narrative [Text Block] rr_StrategyNarrativeTextBlock
  • Investing in securities issued throughout the world.
  • Allocating the fund's assets between stocks and bonds by investing in Fidelity funds (underlying Fidelity funds) and non-affiliated exchange traded funds (ETFs), or through direct investments.
  • Investing up to 25% of assets in commodity-related ETFs and exchange-traded notes (ETNs) and other commodities and commodity-linked investments through a wholly-owned subsidiary.
  • Allocating investments across different countries and regions.
  • Adjusting allocation among asset classes to take advantage of short-term market opportunities and strategic, longer-term opportunities.
  • Allocating assets using a combination of economic research, quantitative analysis, fundamental research and technical analysis.
Risk [Heading] rr_RiskHeading Principal Investment Risks
Risk Narrative [Text Block] rr_RiskNarrativeTextBlock
  • Asset Allocation Risk. If the fund's asset allocation strategy does not work as intended, the fund may not achieve its objective.
  • Investing in Other Funds. Regulatory restrictions may limit the amount that one fund can invest in another, which means that the fund's manager may not be able to invest as much as it wants to in some other funds. The fund bears all risks of investment strategies employed by the underlying funds, including the risk that the underlying funds will not meet their investment objectives.
  • 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.
  • Interest Rate Changes. Interest rate increases can cause the price of a debt or money market security to decrease.
  • 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.
  • Geographic Exposure. Social, political, and economic conditions and changes in regulatory, tax, or economic policy in a country or region could significantly affect the market in that country or region.
  • Industry Exposure. Market conditions, interest rates, and economic, regulatory, or financial developments could significantly affect a single industry or group of related industries.
  • Subsidiary Risk. Investment in an unregistered subsidiary is not subject to the investor protections of the Investment Company Act of 1940 (1940 Act) and is subject to the risks associated with investing in ETFs, ETNs, other derivatives and commodities and commodity-linked investing in general. Changes in tax and other laws could negatively affect investments in the subsidiary.
  • 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. The value of securities of smaller issuers can be more volatile than that of larger issuers. Lower-quality debt securities (those of less than investment-grade quality, also referred to as high yield debt securities) 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.
  • Leverage Risk. Leverage can increase market exposure, magnify investment risks, and cause losses to be realized more quickly.
  • Investing in ETFs and ETNs. ETFs and ETNs may trade at a discount in the secondary market and may not be liquid. ETFs that track an index are subject to tracking error and may be unable to sell poorly performing assets that are included in their index or other benchmark. ETNs are subject to the risks associated with debt securities, including counterparty risk of the issuer.
  • 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.
An investment in the fund is not a deposit of a bank and is not insured or guaranteed by the Federal Deposit Insurance Corporation or any other government agency. You could lose money by investing in the fund.
Risk Lose Money [Text] rr_RiskLoseMoney You could lose money by investing in the fund.
Risk Not Insured Depository Institution [Text] rr_RiskNotInsuredDepositoryInstitution An investment in the fund is not a deposit of a bank and is not insured or guaranteed by the Federal Deposit Insurance Corporation or any other government agency.
Bar Chart and Performance Table [Heading] rr_BarChartAndPerformanceTableHeading Performance
Performance Narrative [Text Block] rr_PerformanceNarrativeTextBlock The following information is intended to help you understand the risks of investing in the fund. The information illustrates the changes in the performance of the fund's shares from year to year and compares the performance of the fund's shares to the performance of a securities market index and 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. Prior to June 1, 2011, the fund operated under certain different investment policies and compared its performance to different indexes. The fund's historical performance may not represent its current investment policies. Past performance (before and after taxes) is not an indication of future performance.

Visit www.advisor.fidelity.com for updated return 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 a hypothetical composite of market indexes over various periods of time.
Performance Availability Website Address [Text] rr_PerformanceAvailabilityWebSiteAddress www.advisor.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
16.01%
June 30, 2009
Lowest Quarter Return
-18.08%
December 31, 2008
Year-to-Date Return
4.59%
June 30, 2014
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.
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. 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, 2013
Inst | Fidelity Global Strategies Fund | Institutional Class
  
Risk/Return: rr_RiskReturnAbstract  
Shareholder fees (fees paid directly from your investment) rr_ShareholderFeeOther none
Management fee rr_ManagementFeesOverAssets 0.50%
Distribution and/or Service (12b-1) fees rr_DistributionAndService12b1FeesOverAssets none
Other expenses rr_OtherExpensesOverAssets 0.01%
Acquired fund fees and expenses rr_AcquiredFundFeesAndExpensesOverAssets 0.34% [1]
Total annual operating expenses rr_ExpensesOverAssets 0.85% [2]
Fee waiver and/or expense reimbursement rr_FeeWaiverOrReimbursementOverAssets 0.10% [1]
Total annual operating expenses after fee waiver and/or expense reimbursement rr_NetExpensesOverAssets 0.75% [2]
1 year rr_ExpenseExampleYear01 77
3 years rr_ExpenseExampleYear03 259
5 years rr_ExpenseExampleYear05 459
10 years rr_ExpenseExampleYear10 $ 1,038
2008 rr_AnnualReturn2008 (28.35%)
2009 rr_AnnualReturn2009 28.72%
2010 rr_AnnualReturn2010 14.95%
2011 rr_AnnualReturn2011 (5.19%)
2012 rr_AnnualReturn2012 12.35%
2013 rr_AnnualReturn2013 8.95%
Year to Date Return, Label rr_YearToDateReturnLabel Year-to-Date Return
Bar Chart, Year to Date Return, Date rr_BarChartYearToDateReturnDate Jun. 30, 2014
Bar Chart, Year to Date Return rr_BarChartYearToDateReturn 4.59%
Highest Quarterly Return, Label rr_HighestQuarterlyReturnLabel Highest Quarter Return
Highest Quarterly Return, Date rr_BarChartHighestQuarterlyReturnDate Jun. 30, 2009
Highest Quarterly Return rr_BarChartHighestQuarterlyReturn 16.01%
Lowest Quarterly Return, Label rr_LowestQuarterlyReturnLabel Lowest Quarter Return
Lowest Quarterly Return, Date rr_BarChartLowestQuarterlyReturnDate Dec. 31, 2008
Lowest Quarterly Return rr_BarChartLowestQuarterlyReturn (18.08%)
Inst | Fidelity Global Strategies Fund | Return Before Taxes | Institutional Class
  
Risk/Return: rr_RiskReturnAbstract  
Column rr_AverageAnnualReturnColumnName Institutional Class
Label rr_AverageAnnualReturnLabel Return Before Taxes
Past 1 year rr_AverageAnnualReturnYear01 8.95%
Past 5 years rr_AverageAnnualReturnYear05 11.42%
Life of class rr_AverageAnnualReturnSinceInception 2.94% [3]
Inception Date rr_AverageAnnualReturnInceptionDate Oct. 31, 2007
Inst | Fidelity Global Strategies Fund | Return After Taxes on Distributions | Institutional Class
  
Risk/Return: rr_RiskReturnAbstract  
Column rr_AverageAnnualReturnColumnName Institutional Class
Label rr_AverageAnnualReturnLabel Return After Taxes on Distributions
Past 1 year rr_AverageAnnualReturnYear01 7.22%
Past 5 years rr_AverageAnnualReturnYear05 10.29%
Life of class rr_AverageAnnualReturnSinceInception 1.92% [3]
Inception Date rr_AverageAnnualReturnInceptionDate Oct. 31, 2007
Inst | Fidelity Global Strategies Fund | Return After Taxes on Distributions and Sale of Fund Shares | Institutional Class
  
Risk/Return: rr_RiskReturnAbstract  
Column rr_AverageAnnualReturnColumnName Institutional Class
Label rr_AverageAnnualReturnLabel Return After Taxes on Distributions and Sale of Fund Shares
Past 1 year rr_AverageAnnualReturnYear01 5.86%
Past 5 years rr_AverageAnnualReturnYear05 8.84%
Life of class rr_AverageAnnualReturnSinceInception 2.04% [3]
Inception Date rr_AverageAnnualReturnInceptionDate Oct. 31, 2007
Inst | Fidelity Global Strategies Fund | MSCI ACWI (All Country World Index) Index (reflects no deduction for fees or expenses)
  
Risk/Return: rr_RiskReturnAbstract  
Label rr_AverageAnnualReturnLabel MSCI ACWI (All Country World Index) Index
Past 1 year rr_AverageAnnualReturnYear01 23.24%
Past 5 years rr_AverageAnnualReturnYear05 15.33%
Life of class rr_AverageAnnualReturnSinceInception 1.86% [3]
Inception Date rr_AverageAnnualReturnInceptionDate Oct. 31, 2007
Inst | Fidelity Global Strategies Fund | Fidelity Global Strategies Composite Index℠ (reflects no deduction for fees or expenses)
  
Risk/Return: rr_RiskReturnAbstract  
Label rr_AverageAnnualReturnLabel Fidelity Global Strategies Composite Index℠
Past 1 year rr_AverageAnnualReturnYear01 12.61%
Past 5 years rr_AverageAnnualReturnYear05 9.71%
Life of class rr_AverageAnnualReturnSinceInception 4.10% [3]
Inception Date rr_AverageAnnualReturnInceptionDate Oct. 31, 2007
[1] The fund may invest in a wholly-owned subsidiary. The subsidiary has entered into a separate contract with FMR Co., Inc. (FMRC) for the management of its portfolio pursuant to which the subsidiary pays FMRC a fee at an annual rate of 0.30% of its net assets. The subsidiary also pays certain other expenses including custody fees. FMRC has contractually agreed to waive the fund's management fee in an amount equal to the management fee paid to FMRC by the subsidiary. This arrangement will remain in effect for at least one year from the effective date of the prospectus, and will remain in effect thereafter as long as FMRC's contract with the subsidiary is in place. If FMRC's contract with the subsidiary is terminated, FMRC, in its sole discretion, may discontinue the arrangement. In addition, FMRC has contractually agreed to waive 0.10% of the fund's management fee. This arrangement will remain in effect through July 31, 2015.
[2] Differs from the ratios of expenses to average net assets in the Financial Highlights section of the prospectus because of acquired fund fees and expenses.
[3] From October 31, 2007.