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Investment Objectives and Goals
Aug. 31, 2024
BNY Mellon AMT-Free Municipal Bond Fund | BNY Mellon AMT-Free Municipal Bond Fund  
Prospectus [Line Items]  
Risk/Return [Heading] Fund Summary
Objective [Heading] Investment Objective
Objective, Primary [Text Block]

The fund seeks as high a level of current income exempt from federal income tax as is consistent with the preservation of capital.

BNY Mellon High Yield Municipal Bond Fund | BNY Mellon High Yield Municipal Bond Fund  
Prospectus [Line Items]  
Risk/Return [Heading] Fund Summary
Objective [Heading] Investment Objective
Objective, Primary [Text Block]

As its primary goal, the fund seeks high current income exempt from federal income tax.

Objective, Secondary [Text Block] As a secondary goal, the fund may seek capital appreciation to the extent consistent with its primary goal.