John Hancock High Yield Municipal Bond Fund Investment Objectives and Goals - Classes A C I and R6 [Member] - John Hancock High Yield Municipal Bond Fund	May 31, 2025
Prospectus [Line Items]
Risk/Return [Heading]	<span style="color:#000000;font-family:Arial Narrow;font-size:24pt;">John Hancock High Yield Municipal Bond Fund</span>
Objective [Heading]	<span style="color:#000000;font-family:Arial Narrow;font-size:10pt;font-weight:bold;">Investment objective</span>
Objective, Primary [Text Block]	To seek a high level of income that is largely exempt from federal income taxes.