Risk/Return Detail Data - FidelitySAIInflation-ProtectedBondIndexFund-PRO |
Mar. 01, 2025
USD ($)
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| Risk/Return: | ||||||
| Registrant Name | Fidelity Salem Street Trust | |||||
| FidelitySAIInflation-ProtectedBondIndexFund-PRO | Fidelity SAI Inflation-Protected Bond Index Fund | ||||||
| Risk/Return: | ||||||
| Risk/Return [Heading] | Fund Summary Fund: Fidelity® SAI Inflation-Protected Bond Index Fund | |||||
| Objective [Heading] | Investment Objective | |||||
| Objective, Primary [Text Block] | Fidelity® SAI Inflation-Protected Bond Index Fund seeks to provide investment results that correspond to the total return of the inflation-protected sector of the United States Treasury market. | |||||
| Expense [Heading] | Fee Table | |||||
| Expense Narrative [Text Block] | The following table describes the fees and expenses that may be incurred when you buy, hold, and sell shares of the fund. | |||||
| Shareholder Fees Caption [Text] | Shareholder fees | |||||
| (fees paid directly from your investment) | none | |||||
| Operating Expenses Caption [Text] | Annual Operating Expenses | |||||
| Fee Waiver or Reimbursement over Assets, Date of Termination | Apr. 30, 2026 | |||||
| Portfolio Turnover [Heading] | Portfolio Turnover | |||||
| Portfolio Turnover [Text Block] | 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 August 16, 2024 to December 31, 2024, the fund's portfolio turnover rate was 8 % of the average value of its portfolio. | |||||
| Portfolio Turnover, Rate | 8.00% | |||||
| Other Expenses, New Fund, Based on Estimates [Text] | Based on estimated amounts for the current fiscal year. | |||||
| Expense Example Narrative [Text Block] | 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 the 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] | Principal Investment Strategies | |||||
| Strategy Narrative [Text Block] | Normally investing at least 80% of assets in inflation-protected debt securities included in the Bloomberg U.S. Treasury Inflation-Protected Securities (TIPS) Index. The index is a market value-weighted index that measures the performance of inflation-protected securities issued by the U.S. Treasury. Effective December 11, 2025, derivative instruments that provide investment exposure to the investments above or exposure to one or more market risk factors associated with such investments are included in the fund's 80% policy, consistent with the fund's investment policies and limitations with respect to investments in derivatives. Using statistical sampling techniques based on duration, maturity, interest rate sensitivity, security structure, and credit quality to attempt to replicate the returns of the Bloomberg U.S. Treasury Inflation-Protected Securities (TIPS) Index using a smaller number of securities. 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. | |||||
| Risk [Heading] | Principal Investment Risks | |||||
| Bar Chart and Performance Table [Heading] | Performance | |||||
| Performance Narrative [Text Block] | 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] | Performance history will be available for the fund after the fund has been in operation for one calendar year. | |||||
| FidelitySAIInflation-ProtectedBondIndexFund-PRO | Fidelity SAI Inflation-Protected Bond Index Fund | Fidelity SAI Inflation-Protected Bond Index Fund | ||||||
| Risk/Return: | ||||||
| Management fee | 0.05% | |||||
| Distribution and/or Service (12b-1) fees | none | |||||
| Other expenses | 0.01% | [1] | ||||
| Total annual operating expenses | 0.06% | |||||
| Fee waiver and/or expense reimbursement | 0.01% | [2] | ||||
| Total annual operating expenses after fee waiver and/or expense reimbursement | 0.05% | |||||
| 1 year | $ 5 | |||||
| 3 years | $ 18 | |||||
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