v3.25.1
Average Annual Total Returns - FidelitySAISustainableMunicipalIncomeSustainableConservativeIncomeMunicipalBondFunds-ComboPRO - FidelitySAISustainableMunicipalIncomeSustainableConservativeIncomeMunicipalBondFunds-ComboPRO - Fidelity SAI Sustainable Municipal Income Fund
Apr. 01, 2025
Fidelity SAI Sustainable Municipal Income Fund | Return Before Taxes  
Average Annual Return:  
Past 1 year 1.02%
Since Inception 3.40% [1]
Fidelity SAI Sustainable Municipal Income Fund | After Taxes on Distributions  
Average Annual Return:  
Past 1 year 1.02%
Since Inception 3.39% [1]
Fidelity SAI Sustainable Municipal Income Fund | After Taxes on Distributions and Sales  
Average Annual Return:  
Past 1 year 1.90%
Since Inception 3.32% [1]
LB015  
Average Annual Return:  
Past 1 year 1.05%
Since Inception 2.26%
LB083  
Average Annual Return:  
Past 1 year 0.88%
Since Inception 2.24%
[1]
A From April 13, 2022 .