v3.26.3
Shareholder Report, Holdings (Details)
Aug. 31, 2026
C000005559 | Georgia  
Holdings [Line Items]  
Percent of Net Asset Value 9.90%
C000005559 | New York  
Holdings [Line Items]  
Percent of Net Asset Value 9.20%
C000005559 | Texas  
Holdings [Line Items]  
Percent of Net Asset Value 8.90%
C000005559 | California  
Holdings [Line Items]  
Percent of Net Asset Value 5.80%
C000005559 | Maryland  
Holdings [Line Items]  
Percent of Net Asset Value 5.80%
C000005559 | Puerto Rico  
Holdings [Line Items]  
Percent of Net Asset Value 5.50%
C000005559 | Virginia  
Holdings [Line Items]  
Percent of Net Asset Value 4.80%
C000005559 | Illinois  
Holdings [Line Items]  
Percent of Net Asset Value 4.20%
C000005559 | New Jersey  
Holdings [Line Items]  
Percent of Net Asset Value 3.40%
C000005559 | Investment TypeOther Holdings Grouping  
Holdings [Line Items]  
Percent of Net Asset Value 42.50%
C000005559 | Hospital Revenue  
Holdings [Line Items]  
Percent of Net Asset Value 19.50%
C000005559 | Housing Finance Revenue  
Holdings [Line Items]  
Percent of Net Asset Value 13.90%
C000005559 | Ground Transportation Revenue  
Holdings [Line Items]  
Percent of Net Asset Value 13.50%
C000005559 | Dedicated Tax Revenue  
Holdings [Line Items]  
Percent of Net Asset Value 12.70%
C000005559 | Educational Revenue  
Holdings [Line Items]  
Percent of Net Asset Value 7.30%
C000005559 | General Obligations - State  
Holdings [Line Items]  
Percent of Net Asset Value 6.10%
C000005559 | Genl Obligations - Local  
Holdings [Line Items]  
Percent of Net Asset Value 4.10%
C000005559 | Lease Revenue  
Holdings [Line Items]  
Percent of Net Asset Value 3.20%
C000005559 | Water & Sewer Revenue  
Holdings [Line Items]  
Percent of Net Asset Value 2.30%
C000005559 | Other 2  
Holdings [Line Items]  
Percent of Net Asset Value 17.40%
C000005560 | Georgia  
Holdings [Line Items]  
Percent of Net Asset Value 9.90%
C000005560 | New York  
Holdings [Line Items]  
Percent of Net Asset Value 9.20%
C000005560 | Texas  
Holdings [Line Items]  
Percent of Net Asset Value 8.90%
C000005560 | California  
Holdings [Line Items]  
Percent of Net Asset Value 5.80%
C000005560 | Maryland  
Holdings [Line Items]  
Percent of Net Asset Value 5.80%
C000005560 | Puerto Rico  
Holdings [Line Items]  
Percent of Net Asset Value 5.50%
C000005560 | Virginia  
Holdings [Line Items]  
Percent of Net Asset Value 4.80%
C000005560 | Illinois  
Holdings [Line Items]  
Percent of Net Asset Value 4.20%
C000005560 | New Jersey  
Holdings [Line Items]  
Percent of Net Asset Value 3.40%
C000005560 | Investment TypeOther Holdings Grouping  
Holdings [Line Items]  
Percent of Net Asset Value 42.50%
C000005560 | Hospital Revenue  
Holdings [Line Items]  
Percent of Net Asset Value 19.50%
C000005560 | Housing Finance Revenue  
Holdings [Line Items]  
Percent of Net Asset Value 13.90%
C000005560 | Ground Transportation Revenue  
Holdings [Line Items]  
Percent of Net Asset Value 13.50%
C000005560 | Dedicated Tax Revenue  
Holdings [Line Items]  
Percent of Net Asset Value 12.70%
C000005560 | Educational Revenue  
Holdings [Line Items]  
Percent of Net Asset Value 7.30%
C000005560 | General Obligations - State  
Holdings [Line Items]  
Percent of Net Asset Value 6.10%
C000005560 | Genl Obligations - Local  
Holdings [Line Items]  
Percent of Net Asset Value 4.10%
C000005560 | Lease Revenue  
Holdings [Line Items]  
Percent of Net Asset Value 3.20%
C000005560 | Water & Sewer Revenue  
Holdings [Line Items]  
Percent of Net Asset Value 2.30%
C000005560 | Other 2  
Holdings [Line Items]  
Percent of Net Asset Value 17.40%
C000193190 | Georgia  
Holdings [Line Items]  
Percent of Net Asset Value 9.90%
C000193190 | New York  
Holdings [Line Items]  
Percent of Net Asset Value 9.20%
C000193190 | Texas  
Holdings [Line Items]  
Percent of Net Asset Value 8.90%
C000193190 | California  
Holdings [Line Items]  
Percent of Net Asset Value 5.80%
C000193190 | Maryland  
Holdings [Line Items]  
Percent of Net Asset Value 5.80%
C000193190 | Puerto Rico  
Holdings [Line Items]  
Percent of Net Asset Value 5.50%
C000193190 | Virginia  
Holdings [Line Items]  
Percent of Net Asset Value 4.80%
C000193190 | Illinois  
Holdings [Line Items]  
Percent of Net Asset Value 4.20%
C000193190 | New Jersey  
Holdings [Line Items]  
Percent of Net Asset Value 3.40%
C000193190 | Investment TypeOther Holdings Grouping  
Holdings [Line Items]  
Percent of Net Asset Value 42.50%
C000193190 | Hospital Revenue  
Holdings [Line Items]  
Percent of Net Asset Value 19.50%
C000193190 | Housing Finance Revenue  
Holdings [Line Items]  
Percent of Net Asset Value 13.90%
C000193190 | Ground Transportation Revenue  
Holdings [Line Items]  
Percent of Net Asset Value 13.50%
C000193190 | Dedicated Tax Revenue  
Holdings [Line Items]  
Percent of Net Asset Value 12.70%
C000193190 | Educational Revenue  
Holdings [Line Items]  
Percent of Net Asset Value 7.30%
C000193190 | General Obligations - State  
Holdings [Line Items]  
Percent of Net Asset Value 6.10%
C000193190 | Genl Obligations - Local  
Holdings [Line Items]  
Percent of Net Asset Value 4.10%
C000193190 | Lease Revenue  
Holdings [Line Items]  
Percent of Net Asset Value 3.20%
C000193190 | Water & Sewer Revenue  
Holdings [Line Items]  
Percent of Net Asset Value 2.30%
C000193190 | Other 2  
Holdings [Line Items]  
Percent of Net Asset Value 17.40%