v3.26.1
Shareholder Report, Holdings (Details)
Apr. 30, 2026
C000005552 | New York  
Holdings [Line Items]  
Percent of Net Asset Value 12.10%
C000005552 | Texas  
Holdings [Line Items]  
Percent of Net Asset Value 10.30%
C000005552 | Virginia  
Holdings [Line Items]  
Percent of Net Asset Value 6.50%
C000005552 | Puerto Rico  
Holdings [Line Items]  
Percent of Net Asset Value 5.60%
C000005552 | Georgia  
Holdings [Line Items]  
Percent of Net Asset Value 5.20%
C000005552 | Washington  
Holdings [Line Items]  
Percent of Net Asset Value 4.40%
C000005552 | Alabama  
Holdings [Line Items]  
Percent of Net Asset Value 4.30%
C000005552 | California  
Holdings [Line Items]  
Percent of Net Asset Value 4.00%
C000005552 | Florida  
Holdings [Line Items]  
Percent of Net Asset Value 3.90%
C000005552 | Other Holdings Grouping  
Holdings [Line Items]  
Percent of Net Asset Value 43.70%
C000005552 | Air & Sea Transportation  
Holdings [Line Items]  
Percent of Net Asset Value 21.30%
C000005552 | Hospital Revenue  
Holdings [Line Items]  
Percent of Net Asset Value 13.80%
C000005552 | Dedicated Tax Revenue  
Holdings [Line Items]  
Percent of Net Asset Value 12.30%
C000005552 | General Obligations - State  
Holdings [Line Items]  
Percent of Net Asset Value 11.50%
C000005552 | General Obligations - Local  
Holdings [Line Items]  
Percent of Net Asset Value 7.30%
C000005552 | Housing Finance Revenue  
Holdings [Line Items]  
Percent of Net Asset Value 6.20%
C000005552 | Water & Sewer Revenue  
Holdings [Line Items]  
Percent of Net Asset Value 4.50%
C000005552 | Electric Revenue  
Holdings [Line Items]  
Percent of Net Asset Value 3.70%
C000005552 | Educational Revenue  
Holdings [Line Items]  
Percent of Net Asset Value 4.10%
C000005552 | Other 2  
Holdings [Line Items]  
Percent of Net Asset Value 15.30%
C000117203 | New York  
Holdings [Line Items]  
Percent of Net Asset Value 12.10%
C000117203 | Texas  
Holdings [Line Items]  
Percent of Net Asset Value 10.30%
C000117203 | Virginia  
Holdings [Line Items]  
Percent of Net Asset Value 6.50%
C000117203 | Puerto Rico  
Holdings [Line Items]  
Percent of Net Asset Value 5.60%
C000117203 | Georgia  
Holdings [Line Items]  
Percent of Net Asset Value 5.20%
C000117203 | Washington  
Holdings [Line Items]  
Percent of Net Asset Value 4.40%
C000117203 | Alabama  
Holdings [Line Items]  
Percent of Net Asset Value 4.30%
C000117203 | California  
Holdings [Line Items]  
Percent of Net Asset Value 4.00%
C000117203 | Florida  
Holdings [Line Items]  
Percent of Net Asset Value 3.90%
C000117203 | Other Holdings Grouping  
Holdings [Line Items]  
Percent of Net Asset Value 43.70%
C000117203 | Air & Sea Transportation  
Holdings [Line Items]  
Percent of Net Asset Value 21.30%
C000117203 | Hospital Revenue  
Holdings [Line Items]  
Percent of Net Asset Value 13.80%
C000117203 | Dedicated Tax Revenue  
Holdings [Line Items]  
Percent of Net Asset Value 12.30%
C000117203 | General Obligations - State  
Holdings [Line Items]  
Percent of Net Asset Value 11.50%
C000117203 | General Obligations - Local  
Holdings [Line Items]  
Percent of Net Asset Value 7.30%
C000117203 | Housing Finance Revenue  
Holdings [Line Items]  
Percent of Net Asset Value 6.20%
C000117203 | Water & Sewer Revenue  
Holdings [Line Items]  
Percent of Net Asset Value 4.50%
C000117203 | Electric Revenue  
Holdings [Line Items]  
Percent of Net Asset Value 3.70%
C000117203 | Educational Revenue  
Holdings [Line Items]  
Percent of Net Asset Value 4.10%
C000117203 | Other 2  
Holdings [Line Items]  
Percent of Net Asset Value 15.30%
C000211685 | New York  
Holdings [Line Items]  
Percent of Net Asset Value 12.10%
C000211685 | Texas  
Holdings [Line Items]  
Percent of Net Asset Value 10.30%
C000211685 | Virginia  
Holdings [Line Items]  
Percent of Net Asset Value 6.50%
C000211685 | Puerto Rico  
Holdings [Line Items]  
Percent of Net Asset Value 5.60%
C000211685 | Georgia  
Holdings [Line Items]  
Percent of Net Asset Value 5.20%
C000211685 | Washington  
Holdings [Line Items]  
Percent of Net Asset Value 4.40%
C000211685 | Alabama  
Holdings [Line Items]  
Percent of Net Asset Value 4.30%
C000211685 | California  
Holdings [Line Items]  
Percent of Net Asset Value 4.00%
C000211685 | Florida  
Holdings [Line Items]  
Percent of Net Asset Value 3.90%
C000211685 | Other Holdings Grouping  
Holdings [Line Items]  
Percent of Net Asset Value 43.70%
C000211685 | Air & Sea Transportation  
Holdings [Line Items]  
Percent of Net Asset Value 21.30%
C000211685 | Hospital Revenue  
Holdings [Line Items]  
Percent of Net Asset Value 13.80%
C000211685 | Dedicated Tax Revenue  
Holdings [Line Items]  
Percent of Net Asset Value 12.30%
C000211685 | General Obligations - State  
Holdings [Line Items]  
Percent of Net Asset Value 11.50%
C000211685 | General Obligations - Local  
Holdings [Line Items]  
Percent of Net Asset Value 7.30%
C000211685 | Housing Finance Revenue  
Holdings [Line Items]  
Percent of Net Asset Value 6.20%
C000211685 | Water & Sewer Revenue  
Holdings [Line Items]  
Percent of Net Asset Value 4.50%
C000211685 | Electric Revenue  
Holdings [Line Items]  
Percent of Net Asset Value 3.70%
C000211685 | Educational Revenue  
Holdings [Line Items]  
Percent of Net Asset Value 4.10%
C000211685 | Other 2  
Holdings [Line Items]  
Percent of Net Asset Value 15.30%