Risk/Return Detail Data - FidelitySeries0-55YearInflation-ProtectedBondIndexFunds-ComboPRO |
Mar. 01, 2025
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| Risk/Return: | ||||
| Registrant Name | Fidelity Salem Street Trust | |||
| FidelitySeries0-55YearInflation-ProtectedBondIndexFunds-ComboPRO | Fidelity Series 5+ Year Inflation-Protected Bond Index Fund | ||||
| Risk/Return: | ||||
| Risk/Return [Heading] | Fund Summary Fund: Fidelity® Series 5+ Year Inflation-Protected Bond Index Fund | |||
| Objective [Heading] | Investment Objective | |||
| Objective, Primary [Text Block] | Fidelity® Series 5+ Year 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 | |||
| Management fee | none | |||
| Distribution and/or Service (12b-1) fees | none | |||
| Other expenses | none | |||
| Total annual operating expenses | none | |||
| 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. During the most recent fiscal year, the fund's portfolio turnover rate was 26 % of the average value of its portfolio. | |||
| Portfolio Turnover, Rate | 26.00% | |||
| 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: | |||
| 1 year | none | |||
| 3 years | none | |||
| 5 years | none | |||
| 10 years | none | |||
| 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 US Treasury Inflation-Protected Securities (TIPS) 5+ Years Index . The index is a market value-weighted index that measures the performance of inflation-protected securities issued by the U.S. Treasury that have a remaining average life of 5 or more years. 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 US Treasury Inflation-Protected Securities (TIPS) 5+ Years 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] | 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 additional index has 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. The performance shown does not reflect the impact of any fees paid at the fee-based account or plan level, if applicable. Visit www.fidelity.com for more recent performance information. | |||
| Performance Information Illustrates Variability of Returns [Text] | 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] | www.fidelity.com | |||
| Performance Past Does Not Indicate Future [Text] | Past performance (before and after taxes) is not an indication of future performance. | |||
| Bar Chart [Heading] | Year-by-Year Returns | |||
| Highest Quarterly Return, Label | Highest Quarter Return | |||
| Highest Quarterly Return, Date | Dec. 31, 2023 | |||
| Highest Quarterly Return | 6.31% | |||
| Lowest Quarterly Return, Label | Lowest Quarter Return | |||
| Lowest Quarterly Return, Date | Jun. 30, 2022 | |||
| Lowest Quarterly Return | (10.42%) | |||
| Performance Table Heading | Average Annual Returns | |||
| Performance Table Uses Highest Federal Rate | 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 | 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 Explanation after Tax Higher | 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 | 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, 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. | |||
| FidelitySeries0-55YearInflation-ProtectedBondIndexFunds-ComboPRO | Fidelity Series 5+ Year Inflation-Protected Bond Index Fund | Fidelity Series 5+ Year Inflation-Protected Bond Index Fund | ||||
| Risk/Return: | ||||
| Annual Return, Inception Date | Aug. 13, 2021 | |||
| 2022 | (19.04%) | |||
| 2023 | 2.81% | |||
| 2024 | (0.42%) | |||
| FidelitySeries0-55YearInflation-ProtectedBondIndexFunds-ComboPRO | Fidelity Series 5+ Year Inflation-Protected Bond Index Fund | Return Before Taxes | Fidelity Series 5+ Year Inflation-Protected Bond Index Fund | ||||
| Risk/Return: | ||||
| Label | Return Before Taxes | |||
| Past 1 year | (0.42%) | |||
| Since Inception | (4.78%) | [1] | ||
| FidelitySeries0-55YearInflation-ProtectedBondIndexFunds-ComboPRO | Fidelity Series 5+ Year Inflation-Protected Bond Index Fund | After Taxes on Distributions | Fidelity Series 5+ Year Inflation-Protected Bond Index Fund | ||||
| Risk/Return: | ||||
| Label | Return After Taxes on Distributions | |||
| Past 1 year | (1.77%) | |||
| Since Inception | (6.34%) | [1] | ||
| FidelitySeries0-55YearInflation-ProtectedBondIndexFunds-ComboPRO | Fidelity Series 5+ Year Inflation-Protected Bond Index Fund | After Taxes on Distributions and Sales | Fidelity Series 5+ Year Inflation-Protected Bond Index Fund | ||||
| Risk/Return: | ||||
| Label | Return After Taxes on Distributions and Sale of Fund Shares | |||
| Past 1 year | (0.20%) | |||
| Since Inception | (4.20%) | [1] | ||
| FidelitySeries0-55YearInflation-ProtectedBondIndexFunds-ComboPRO | Fidelity Series 5+ Year Inflation-Protected Bond Index Fund | LB001 | ||||
| Risk/Return: | ||||
| Label | Bloomberg U.S. Aggregate Bond Index | |||
| Past 1 year | 1.25% | |||
| Since Inception | (2.35%) | |||
| FidelitySeries0-55YearInflation-ProtectedBondIndexFunds-ComboPRO | Fidelity Series 5+ Year Inflation-Protected Bond Index Fund | IXW40 | ||||
| Risk/Return: | ||||
| Label | Bloomberg US Treasury Inflation-Protected Securities (TIPS) 5+ Years Index | |||
| Past 1 year | (0.78%) | |||
| Since Inception | (4.72%) | |||
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