v3.26.1
Shareholder Report, Holdings (Details)
Apr. 30, 2026
C000005553 | Texas  
Holdings [Line Items]  
Percent of Net Asset Value 11.60%
C000005553 | New York  
Holdings [Line Items]  
Percent of Net Asset Value 8.60%
C000005553 | California  
Holdings [Line Items]  
Percent of Net Asset Value 8.30%
C000005553 | Georgia  
Holdings [Line Items]  
Percent of Net Asset Value 5.10%
C000005553 | Maryland  
Holdings [Line Items]  
Percent of Net Asset Value 4.80%
C000005553 | Puerto Rico  
Holdings [Line Items]  
Percent of Net Asset Value 4.70%
C000005553 | Florida  
Holdings [Line Items]  
Percent of Net Asset Value 4.10%
C000005553 | District of Columbia  
Holdings [Line Items]  
Percent of Net Asset Value 3.60%
C000005553 | Virginia  
Holdings [Line Items]  
Percent of Net Asset Value 3.30%
C000005553 | Other Holdings Grouping  
Holdings [Line Items]  
Percent of Net Asset Value 45.90%
C000005553 | Air & Sea Transportation  
Holdings [Line Items]  
Percent of Net Asset Value 23.00%
C000005553 | Hospital Revenue  
Holdings [Line Items]  
Percent of Net Asset Value 14.20%
C000005553 | Dedicated Tax Revenue  
Holdings [Line Items]  
Percent of Net Asset Value 12.30%
C000005553 | Housing Finance Revenue  
Holdings [Line Items]  
Percent of Net Asset Value 9.40%
C000005553 | Educational Revenue  
Holdings [Line Items]  
Percent of Net Asset Value 7.90%
C000005553 | General Obligations - State  
Holdings [Line Items]  
Percent of Net Asset Value 6.00%
C000005553 | Genl Obligations - Local  
Holdings [Line Items]  
Percent of Net Asset Value 5.20%
C000005553 | Water & Sewer Revenue  
Holdings [Line Items]  
Percent of Net Asset Value 2.60%
C000005553 | Lease Revenue  
Holdings [Line Items]  
Percent of Net Asset Value 2.20%
C000005553 | Other 2  
Holdings [Line Items]  
Percent of Net Asset Value 17.20%
C000117204 | Texas  
Holdings [Line Items]  
Percent of Net Asset Value 11.60%
C000117204 | New York  
Holdings [Line Items]  
Percent of Net Asset Value 8.60%
C000117204 | California  
Holdings [Line Items]  
Percent of Net Asset Value 8.30%
C000117204 | Georgia  
Holdings [Line Items]  
Percent of Net Asset Value 5.10%
C000117204 | Maryland  
Holdings [Line Items]  
Percent of Net Asset Value 4.80%
C000117204 | Puerto Rico  
Holdings [Line Items]  
Percent of Net Asset Value 4.70%
C000117204 | Florida  
Holdings [Line Items]  
Percent of Net Asset Value 4.10%
C000117204 | District of Columbia  
Holdings [Line Items]  
Percent of Net Asset Value 3.60%
C000117204 | Virginia  
Holdings [Line Items]  
Percent of Net Asset Value 3.30%
C000117204 | Other Holdings Grouping  
Holdings [Line Items]  
Percent of Net Asset Value 45.90%
C000117204 | Air & Sea Transportation  
Holdings [Line Items]  
Percent of Net Asset Value 23.00%
C000117204 | Hospital Revenue  
Holdings [Line Items]  
Percent of Net Asset Value 14.20%
C000117204 | Dedicated Tax Revenue  
Holdings [Line Items]  
Percent of Net Asset Value 12.30%
C000117204 | Housing Finance Revenue  
Holdings [Line Items]  
Percent of Net Asset Value 9.40%
C000117204 | Educational Revenue  
Holdings [Line Items]  
Percent of Net Asset Value 7.90%
C000117204 | General Obligations - State  
Holdings [Line Items]  
Percent of Net Asset Value 6.00%
C000117204 | Genl Obligations - Local  
Holdings [Line Items]  
Percent of Net Asset Value 5.20%
C000117204 | Water & Sewer Revenue  
Holdings [Line Items]  
Percent of Net Asset Value 2.60%
C000117204 | Lease Revenue  
Holdings [Line Items]  
Percent of Net Asset Value 2.20%
C000117204 | Other 2  
Holdings [Line Items]  
Percent of Net Asset Value 17.20%
C000211686 | Texas  
Holdings [Line Items]  
Percent of Net Asset Value 11.60%
C000211686 | New York  
Holdings [Line Items]  
Percent of Net Asset Value 8.60%
C000211686 | California  
Holdings [Line Items]  
Percent of Net Asset Value 8.30%
C000211686 | Georgia  
Holdings [Line Items]  
Percent of Net Asset Value 5.10%
C000211686 | Maryland  
Holdings [Line Items]  
Percent of Net Asset Value 4.80%
C000211686 | Puerto Rico  
Holdings [Line Items]  
Percent of Net Asset Value 4.70%
C000211686 | Florida  
Holdings [Line Items]  
Percent of Net Asset Value 4.10%
C000211686 | District of Columbia  
Holdings [Line Items]  
Percent of Net Asset Value 3.60%
C000211686 | Virginia  
Holdings [Line Items]  
Percent of Net Asset Value 3.30%
C000211686 | Other Holdings Grouping  
Holdings [Line Items]  
Percent of Net Asset Value 45.90%
C000211686 | Air & Sea Transportation  
Holdings [Line Items]  
Percent of Net Asset Value 23.00%
C000211686 | Hospital Revenue  
Holdings [Line Items]  
Percent of Net Asset Value 14.20%
C000211686 | Dedicated Tax Revenue  
Holdings [Line Items]  
Percent of Net Asset Value 12.30%
C000211686 | Housing Finance Revenue  
Holdings [Line Items]  
Percent of Net Asset Value 9.40%
C000211686 | Educational Revenue  
Holdings [Line Items]  
Percent of Net Asset Value 7.90%
C000211686 | General Obligations - State  
Holdings [Line Items]  
Percent of Net Asset Value 6.00%
C000211686 | Genl Obligations - Local  
Holdings [Line Items]  
Percent of Net Asset Value 5.20%
C000211686 | Water & Sewer Revenue  
Holdings [Line Items]  
Percent of Net Asset Value 2.60%
C000211686 | Lease Revenue  
Holdings [Line Items]  
Percent of Net Asset Value 2.20%
C000211686 | Other 2  
Holdings [Line Items]  
Percent of Net Asset Value 17.20%