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Label Element Value
Risk/Return: rr_RiskReturnAbstract  
Registrant Name dei_EntityRegistrantName FIDELITY SALEM STREET TRUST

Prospectus Date rr_ProspectusDate May 30, 2012
A T B C | Fidelity Inflation-Protected Bond Fund
  
Risk/Return: rr_RiskReturnAbstract  
Risk/Return [Heading] rr_RiskReturnHeading Fund Summary

Fund/Class:
Fidelity® Inflation-Protected Bond Fund/Fidelity Advisor® Inflation-Protected Bond Fund A, T, B, C
Objective [Heading] rr_ObjectiveHeading Investment Objective
Objective, Primary [Text Block] rr_ObjectivePrimaryTextBlock The fund seeks a total return that exceeds the rate of inflation over the long term.
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, hold, or sell 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 (Click Here) of the prospectus.
Shareholder Fees Caption [Text] rr_ShareholderFeesCaption Shareholder fees
(fees paid directly from your investment)
Operating Expenses Caption [Text] rr_OperatingExpensesCaption Annual class operating expenses
(expenses that you pay each year as a % of the value of your investment)
Portfolio Turnover [Heading] rr_PortfolioTurnoverHeading Portfolio Turnover
Portfolio Turnover [Text Block] rr_PortfolioTurnoverTextBlock The fund pays transaction costs, such as commissions, when it buys and sells securities (or "turns over" its portfolio). A higher portfolio turnover rate may indicate higher transaction costs and may result in higher taxes when fund shares are held in a taxable account. These costs, which are not reflected in annual operating expenses or in the example, affect the fund's performance. During the most recent fiscal year, the fund's portfolio turnover rate was 24% of the average value of its portfolio.
Portfolio Turnover, Rate rr_PortfolioTurnoverRate 24.00%
Expense 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.
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 mutual 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 at least 80% of assets in inflation-protected debt securities of all types.
  • Normally investing primarily in U.S. dollar-denominated inflation-protected debt securities.
  • Currently focusing investments in inflation-protected debt securities issued by the U.S. Treasury, but may also invest in inflation-protected debt securities issued by U.S. Government agencies and instrumentalities other than the U.S. Treasury, and by other entities such as corporations and foreign governments.
  • Managing the fund to have similar overall interest rate risk to the Barclays® U.S. Treasury Inflation-Protected Securities (TIPS) Index (Series-L).
  • Allocating assets across different market sectors and maturities.
  • Investing in domestic and foreign issuers.
  • Analyzing the credit quality of the issuer, security-specific features, current and potential future valuation, and trading opportunities to select investments.
  • Engaging in transactions that have a leveraging effect on the fund, including investments in derivatives - such as swaps (interest rate, total return, and credit default) and futures contracts - and forward-settling securities, to adjust the fund's risk exposure.
  • 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 Principal Investment Risks
Risk Narrative [Text Block] rr_RiskNarrativeTextBlock
  • 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.
  • 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.
  • Leverage Risk. Leverage can increase market exposure, magnify investment risks, and cause losses to be realized more quickly.
  • Investing for Inflation Protection. 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.
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 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 over various periods of time. The index description appears in the Additional Information about the Index section of the prospectus. 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 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 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

4.87%

March 31, 2004

Lowest Quarter Return

-3.82%

September 30, 2008

Year-to-Date Return

0.65%

March 31, 2012
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.
Performance Table One Class of after Tax Shown [Text] rr_PerformanceTableOneClassOfAfterTaxShown After-tax returns for Class A are shown in the table below and after-tax returns for other classes will vary.
Performance Table Narrative rr_PerformanceTableNarrativeTextBlock Unlike the returns in the bar chart, the returns in the table reflect the maximum applicable sales charges. After-tax returns are calculated using the historical highest individual federal marginal income tax rates, but do not reflect the impact of state or local taxes. After-tax returns for Class A are shown in the table below and after-tax returns for other classes will vary. Actual after-tax returns may differ depending on your individual circumstances. The after-tax returns shown are not relevant if you hold your shares in a retirement account or in another tax-deferred arrangement.

For the periods ended
December 31, 2011
A T B C | Fidelity Inflation-Protected Bond Fund | Class A
  
Risk/Return: rr_RiskReturnAbstract  
Maximum sales charge (load) on purchases (as a % of offering price) rr_MaximumDeferredSalesChargeOverOfferingPrice 4.00%
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 0.32%
Distribution and/or Service (12b-1) fees rr_DistributionAndService12b1FeesOverAssets 0.25%
Other expenses rr_OtherExpensesOverAssets 0.19%
Total annual operating expenses rr_ExpensesOverAssets 0.76%
Expenses Deferred Charges [Text Block] rr_ExpensesDeferredChargesTextBlock Class A and Class T purchases of $1 million or more will not be subject to a front-end sales charge. Such Class A and Class T purchases may be subject, upon redemption, to a contingent deferred sales charge (CDSC) of 0.75% or 0.25%,respectively.
1 year rr_ExpenseExampleYear01 475
3 years rr_ExpenseExampleYear03 633
5 years rr_ExpenseExampleYear05 805
10 years rr_ExpenseExampleYear10 1,305
1 year rr_ExpenseExampleNoRedemptionYear01 475
3 years rr_ExpenseExampleNoRedemptionYear03 633
5 years rr_ExpenseExampleNoRedemptionYear05 805
10 years rr_ExpenseExampleNoRedemptionYear10 1,305
2003 rr_AnnualReturn2003 7.60%
2004 rr_AnnualReturn2004 8.00%
2005 rr_AnnualReturn2005 2.07%
2006 rr_AnnualReturn2006 (0.06%)
2007 rr_AnnualReturn2007 8.80%
2008 rr_AnnualReturn2008 (2.62%)
2009 rr_AnnualReturn2009 9.41%
2010 rr_AnnualReturn2010 5.51%
2011 rr_AnnualReturn2011 12.71%
Year to Date Return, Label rr_YearToDateReturnLabel Year-to-Date Return
Bar Chart, Year to Date Return, Date rr_BarChartYearToDateReturnDate Mar. 31, 2012
Bar Chart, Year to Date Return rr_BarChartYearToDateReturn 0.65%
Highest Quarterly Return, Label rr_HighestQuarterlyReturnLabel Highest Quarter Return
Highest Quarterly Return, Date rr_BarChartHighestQuarterlyReturnDate Mar. 31, 2004
Highest Quarterly Return rr_BarChartHighestQuarterlyReturn 4.87%
Lowest Quarterly Return, Label rr_LowestQuarterlyReturnLabel Lowest Quarter Return
Lowest Quarterly Return, Date rr_BarChartLowestQuarterlyReturnDate Sep. 30, 2008
Lowest Quarterly Return rr_BarChartLowestQuarterlyReturn (3.82%)
A T B C | Fidelity Inflation-Protected Bond Fund | Class T
  
Risk/Return: rr_RiskReturnAbstract  
Maximum sales charge (load) on purchases (as a % of offering price) rr_MaximumDeferredSalesChargeOverOfferingPrice 4.00%
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 0.32%
Distribution and/or Service (12b-1) fees rr_DistributionAndService12b1FeesOverAssets 0.25%
Other expenses rr_OtherExpensesOverAssets 0.22%
Total annual operating expenses rr_ExpensesOverAssets 0.79%
Expenses Deferred Charges [Text Block] rr_ExpensesDeferredChargesTextBlock Class A and Class T purchases of $1 million or more will not be subject to a front-end sales charge. Such Class A and Class T purchases may be subject, upon redemption, to a contingent deferred sales charge (CDSC) of 0.75% or 0.25%,respectively.
1 year rr_ExpenseExampleYear01 477
3 years rr_ExpenseExampleYear03 642
5 years rr_ExpenseExampleYear05 821
10 years rr_ExpenseExampleYear10 1,339
1 year rr_ExpenseExampleNoRedemptionYear01 477
3 years rr_ExpenseExampleNoRedemptionYear03 642
5 years rr_ExpenseExampleNoRedemptionYear05 821
10 years rr_ExpenseExampleNoRedemptionYear10 1,339
A T B C | Fidelity Inflation-Protected Bond Fund | Class B
  
Risk/Return: rr_RiskReturnAbstract  
Maximum sales charge (load) on purchases (as a % of offering price) rr_MaximumDeferredSalesChargeOverOfferingPrice none
Maximum contingent deferred sales charge (as a % of the lesser of original purchase price or redemption proceeds) rr_MaximumDeferredSalesChargeOverOther 5.00% [2]
Management fee rr_ManagementFeesOverAssets 0.32%
Distribution and/or Service (12b-1) fees rr_DistributionAndService12b1FeesOverAssets 0.90%
Other expenses rr_OtherExpensesOverAssets 0.25%
Total annual operating expenses rr_ExpensesOverAssets 1.47%
Expenses Deferred Charges [Text Block] rr_ExpensesDeferredChargesTextBlock Declines over 6 years from 5.00% to 0%.
1 year rr_ExpenseExampleYear01 650
3 years rr_ExpenseExampleYear03 765
5 years rr_ExpenseExampleYear05 1,003
10 years rr_ExpenseExampleYear10 1,474
1 year rr_ExpenseExampleNoRedemptionYear01 150
3 years rr_ExpenseExampleNoRedemptionYear03 465
5 years rr_ExpenseExampleNoRedemptionYear05 803
10 years rr_ExpenseExampleNoRedemptionYear10 1,474
A T B C | Fidelity Inflation-Protected Bond Fund | Class C
  
Risk/Return: rr_RiskReturnAbstract  
Maximum sales charge (load) on purchases (as a % of offering price) rr_MaximumDeferredSalesChargeOverOfferingPrice none
Maximum contingent deferred sales charge (as a % of the lesser of original purchase price or redemption proceeds) rr_MaximumDeferredSalesChargeOverOther 1.00% [3]
Management fee rr_ManagementFeesOverAssets 0.32%
Distribution and/or Service (12b-1) fees rr_DistributionAndService12b1FeesOverAssets 1.00%
Other expenses rr_OtherExpensesOverAssets 0.19%
Total annual operating expenses rr_ExpensesOverAssets 1.51%
Expenses Deferred Charges [Text Block] rr_ExpensesDeferredChargesTextBlock On Class C shares redeemed less than one year after purchase.
1 year rr_ExpenseExampleYear01 254
3 years rr_ExpenseExampleYear03 477
5 years rr_ExpenseExampleYear05 824
10 years rr_ExpenseExampleYear10 1,802
1 year rr_ExpenseExampleNoRedemptionYear01 154
3 years rr_ExpenseExampleNoRedemptionYear03 477
5 years rr_ExpenseExampleNoRedemptionYear05 824
10 years rr_ExpenseExampleNoRedemptionYear10 1,802
A T B C | Fidelity Inflation-Protected Bond Fund | Return Before Taxes | Class A
  
Risk/Return: rr_RiskReturnAbstract  
Label rr_AverageAnnualReturnLabel Class A - Return Before Taxes
Past 1 year rr_AverageAnnualReturnYear01 8.20%
Past 5 years rr_AverageAnnualReturnYear05 5.76%
Life of class rr_AverageAnnualReturnSinceInception 5.09% [4]
Inception Date rr_AverageAnnualReturnInceptionDate Oct. 02, 2002
A T B C | Fidelity Inflation-Protected Bond Fund | Return Before Taxes | Class T
  
Risk/Return: rr_RiskReturnAbstract  
Label rr_AverageAnnualReturnLabel Class T - Return Before Taxes
Past 1 year rr_AverageAnnualReturnYear01 8.07%
Past 5 years rr_AverageAnnualReturnYear05 5.75%
Life of class rr_AverageAnnualReturnSinceInception 5.05% [4]
Inception Date rr_AverageAnnualReturnInceptionDate Oct. 02, 2002
A T B C | Fidelity Inflation-Protected Bond Fund | Return Before Taxes | Class B
  
Risk/Return: rr_RiskReturnAbstract  
Label rr_AverageAnnualReturnLabel Class B - Return Before Taxes
Past 1 year rr_AverageAnnualReturnYear01 6.91%
Past 5 years rr_AverageAnnualReturnYear05 5.59%
Life of class rr_AverageAnnualReturnSinceInception 5.01% [4]
Inception Date rr_AverageAnnualReturnInceptionDate Oct. 02, 2002
A T B C | Fidelity Inflation-Protected Bond Fund | Return Before Taxes | Class C
  
Risk/Return: rr_RiskReturnAbstract  
Label rr_AverageAnnualReturnLabel Class C - Return Before Taxes
Past 1 year rr_AverageAnnualReturnYear01 10.82%
Past 5 years rr_AverageAnnualReturnYear05 5.82%
Life of class rr_AverageAnnualReturnSinceInception 4.72% [4]
Inception Date rr_AverageAnnualReturnInceptionDate Oct. 02, 2002
A T B C | Fidelity Inflation-Protected Bond Fund | Return After Taxes on Distributions | Class A
  
Risk/Return: rr_RiskReturnAbstract  
Label rr_AverageAnnualReturnLabel Class A - Return After Taxes on Distributions
Past 1 year rr_AverageAnnualReturnYear01 7.23%
Past 5 years rr_AverageAnnualReturnYear05 4.71%
Life of class rr_AverageAnnualReturnSinceInception 3.87% [4]
Inception Date rr_AverageAnnualReturnInceptionDate Oct. 02, 2002
A T B C | Fidelity Inflation-Protected Bond Fund | Return After Taxes on Distributions and Sale of Fund Shares | Class A
  
Risk/Return: rr_RiskReturnAbstract  
Label rr_AverageAnnualReturnLabel Class A - Return After Taxes on Distributions and Sale of Fund Shares
Past 1 year rr_AverageAnnualReturnYear01 5.31%
Past 5 years rr_AverageAnnualReturnYear05 4.31%
Life of class rr_AverageAnnualReturnSinceInception 3.64% [4]
Inception Date rr_AverageAnnualReturnInceptionDate Oct. 02, 2002
A T B C | Fidelity Inflation-Protected Bond Fund | Barclays U.S. TIPS Index (Series-L) (reflects no deduction for fees, expenses, or taxes)
  
Risk/Return: rr_RiskReturnAbstract  
Label rr_AverageAnnualReturnLabel Barclays® U.S. TIPS Index (Series-L)
Past 1 year rr_AverageAnnualReturnYear01 13.56%
Past 5 years rr_AverageAnnualReturnYear05 7.95%
Life of class rr_AverageAnnualReturnSinceInception 6.55% [4]
Inception Date rr_AverageAnnualReturnInceptionDate Oct. 02, 2002
[1] Class A and Class T purchases of $1 million or more will not be subject to a front-end sales charge. Such Class A and Class T purchases may be subject, upon redemption, to a contingent deferred sales charge (CDSC) of 0.75% or 0.25%, respectively.
[2] Declines over 6 years from 5.00% to 0%.
[3] On Class C shares redeemed less than one year after purchase.
[4] From October 2, 2002.