v3.25.1
Average Annual Total Returns - FidelitySAITax-FreeBondFund-PRO - FidelitySAITax-FreeBondFund-PRO - Fidelity SAI Tax-Free Bond Fund
Apr. 01, 2025
Fidelity SAI Tax-Free Bond Fund | Return Before Taxes  
Average Annual Return:  
Past 1 year 1.77%
Past 5 years 1.09%
Since Inception 2.47% [1]
Fidelity SAI Tax-Free Bond Fund | After Taxes on Distributions  
Average Annual Return:  
Past 1 year 1.77%
Past 5 years 1.09%
Since Inception 2.45% [1]
Fidelity SAI Tax-Free Bond Fund | After Taxes on Distributions and Sales  
Average Annual Return:  
Past 1 year 2.30%
Past 5 years 1.39%
Since Inception 2.46% [1]
LB123  
Average Annual Return:  
Past 1 year 0.82%
Past 5 years 0.93%
Since Inception 2.31%
LB015  
Average Annual Return:  
Past 1 year 1.05%
Past 5 years 0.99%
Since Inception 2.24%
[1]
A From October 2, 2018 .