v3.25.1
Average Annual Total Returns - FidelitySAISustainableMunicipalIncomeSustainableConservativeIncomeMunicipalBondFunds-ComboPRO - FidelitySAISustainableMunicipalIncomeSustainableConservativeIncomeMunicipalBondFunds-ComboPRO - Fidelity SAI Sustainable Conservative Income Municipal Bond Fund
Apr. 01, 2025
Fidelity SAI Sustainable Conservative Income Municipal Bond Fund | Return Before Taxes  
Average Annual Return:  
Past 1 year 3.32%
Since Inception 2.98% [1]
Fidelity SAI Sustainable Conservative Income Municipal Bond Fund | After Taxes on Distributions  
Average Annual Return:  
Past 1 year 3.32%
Since Inception 2.98% [1]
Fidelity SAI Sustainable Conservative Income Municipal Bond Fund | After Taxes on Distributions and Sales  
Average Annual Return:  
Past 1 year 3.36%
Since Inception 2.98% [1]
LB015  
Average Annual Return:  
Past 1 year 1.05%
Since Inception 3.59%
LB319  
Average Annual Return:  
Past 1 year 2.71%
Since Inception 2.54%
IXV4E  
Average Annual Return:  
Past 1 year 3.10%
Since Inception 2.82%
[1]
A From June 16, 2022 .