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Label Element Value
Class Y | Transportation [Member]  
Holdings [Line Items] oef_HoldingsLineItems  
Percent of Net Asset Value oef_PctOfNav 15.70%
Class Y | Local General Obligation [Member]  
Holdings [Line Items] oef_HoldingsLineItems  
Percent of Net Asset Value oef_PctOfNav 11.70%
Class Y | Utilities [Member]  
Holdings [Line Items] oef_HoldingsLineItems  
Percent of Net Asset Value oef_PctOfNav 11.40%
Class Y | Health Care [Member]  
Holdings [Line Items] oef_HoldingsLineItems  
Percent of Net Asset Value oef_PctOfNav 11.10%
Class Y | Education [Member]  
Holdings [Line Items] oef_HoldingsLineItems  
Percent of Net Asset Value oef_PctOfNav 10.50%
Class Y | State General Obligation [Member]  
Holdings [Line Items] oef_HoldingsLineItems  
Percent of Net Asset Value oef_PctOfNav 7.20%
Class Y | Housing [Member]  
Holdings [Line Items] oef_HoldingsLineItems  
Percent of Net Asset Value oef_PctOfNav 7.00%
Class Y | Special Tax [Member]  
Holdings [Line Items] oef_HoldingsLineItems  
Percent of Net Asset Value oef_PctOfNav 5.70%
Class Y | Tobacco [Member]  
Holdings [Line Items] oef_HoldingsLineItems  
Percent of Net Asset Value oef_PctOfNav 4.30%
Class Y | Financials [Member]  
Holdings [Line Items] oef_HoldingsLineItems  
Percent of Net Asset Value oef_PctOfNav 4.20%
Class Y | Land [Member]  
Holdings [Line Items] oef_HoldingsLineItems  
Percent of Net Asset Value oef_PctOfNav 1.70%
Class Y | Prerefunded [Member]  
Holdings [Line Items] oef_HoldingsLineItems  
Percent of Net Asset Value oef_PctOfNav 1.70%
Class Y | Other [Member]  
Holdings [Line Items] oef_HoldingsLineItems  
Percent of Net Asset Value oef_PctOfNav 0.70%
Class Y | Cash and Equivalents [Member]  
Holdings [Line Items] oef_HoldingsLineItems  
Percent of Net Asset Value oef_PctOfNav 7.10%