v3.25.0.1
Average Annual Total Returns - FidelityAdvisorConservativeIncomeMunicipalBondFund-ClassAIZ-PRO - FidelityAdvisorConservativeIncomeMunicipalBondFund-ClassAIZ-PRO - Fidelity Conservative Income Municipal Bond Fund
Mar. 01, 2025
Fidelity Advisor Conservative Income Municipal Bond Fund - Class Z | Return Before Taxes  
Average Annual Return:  
Past 1 year 3.36%
Since Inception 3.75% [1]
Fidelity Advisor Conservative Income Municipal Bond Fund - Class A | Return Before Taxes  
Average Annual Return:  
Past 1 year 1.57%
Since Inception 2.54% [2]
Fidelity Advisor Conservative Income Municipal Bond Fund - Class A | After Taxes on Distributions  
Average Annual Return:  
Past 1 year 1.57%
Since Inception 2.54% [2]
Fidelity Advisor Conservative Income Municipal Bond Fund - Class A | After Taxes on Distributions and Sales  
Average Annual Return:  
Past 1 year 2.18%
Since Inception 2.66% [2]
Fidelity Advisor Conservative Income Municipal Bond Fund - Class I | Return Before Taxes  
Average Annual Return:  
Past 1 year 3.30%
Since Inception 3.70% [3]
LB015  
Average Annual Return:  
Past 1 year 1.05%
Since Inception 3.89%
F1872  
Average Annual Return:  
Past 1 year 3.10%
Since Inception 3.51%
LB319  
Average Annual Return:  
Past 1 year 2.71%
Since Inception 3.48%
[1]
C From May 25, 2023 .
[2]
A From May 25, 2023 .
[3]
B From May 25, 2023 .