Risk/Return Detail Data - FidelitySAIInternationalIndexFunds-ComboPRO |
Aug. 01, 2025 |
|---|---|
| FidelitySAIInternationalIndexFunds-ComboPRO | | |
| Prospectus Line Items | |
| Supplement to Prospectus [Text Block] | Supplement to theFidelity® SAI Emerging Markets Value Index Fund, Fidelity® SAI International Momentum Index Fund, and Fidelity® SAI International Quality Index FundDecember 30, 2024Prospectus |
| Objective, Primary [Text Block] | Fidelity® SAI International Momentum Index Fund seeks to provide investment results that correspond to the total return of international stocks with high momentum characteristics. |
| Document Type | 497 |
| Registrant Name | Fidelity Salem Street Trust |