v3.26.3
Shareholder Report, Holdings (Details)
Aug. 31, 2026
C000005558 | Puerto Rico  
Holdings [Line Items]  
Percent of Net Asset Value 9.10%
C000005558 | California  
Holdings [Line Items]  
Percent of Net Asset Value 7.50%
C000005558 | Texas  
Holdings [Line Items]  
Percent of Net Asset Value 6.30%
C000005558 | Florida  
Holdings [Line Items]  
Percent of Net Asset Value 6.20%
C000005558 | Wisconsin  
Holdings [Line Items]  
Percent of Net Asset Value 5.40%
C000005558 | Ohio  
Holdings [Line Items]  
Percent of Net Asset Value 5.30%
C000005558 | Pennsylvania  
Holdings [Line Items]  
Percent of Net Asset Value 5.00%
C000005558 | Illinois  
Holdings [Line Items]  
Percent of Net Asset Value 4.00%
C000005558 | Georgia  
Holdings [Line Items]  
Percent of Net Asset Value 4.00%
C000005558 | Investment TypeOther Holdings Grouping  
Holdings [Line Items]  
Percent of Net Asset Value 47.20%
C000005558 | Hospital Revenue  
Holdings [Line Items]  
Percent of Net Asset Value 21.10%
C000005558 | Ground Transportation Revenue  
Holdings [Line Items]  
Percent of Net Asset Value 11.40%
C000005558 | Educational Revenue  
Holdings [Line Items]  
Percent of Net Asset Value 9.80%
C000005558 | Dedicated Tax Revenue  
Holdings [Line Items]  
Percent of Net Asset Value 9.20%
C000005558 | Housing Finance Revenue  
Holdings [Line Items]  
Percent of Net Asset Value 9.70%
C000005558 | Industrial & Pollution Control Revenue  
Holdings [Line Items]  
Percent of Net Asset Value 8.00%
C000005558 | General Obligations - State  
Holdings [Line Items]  
Percent of Net Asset Value 4.00%
C000005558 | Genl Obligations - Local  
Holdings [Line Items]  
Percent of Net Asset Value 3.00%
C000005558 | Water & Sewer Revenue  
Holdings [Line Items]  
Percent of Net Asset Value 1.70%
C000005558 | Other 2  
Holdings [Line Items]  
Percent of Net Asset Value 22.10%
C000117193 | Puerto Rico  
Holdings [Line Items]  
Percent of Net Asset Value 9.10%
C000117193 | California  
Holdings [Line Items]  
Percent of Net Asset Value 7.50%
C000117193 | Texas  
Holdings [Line Items]  
Percent of Net Asset Value 6.30%
C000117193 | Florida  
Holdings [Line Items]  
Percent of Net Asset Value 6.20%
C000117193 | Wisconsin  
Holdings [Line Items]  
Percent of Net Asset Value 5.40%
C000117193 | Ohio  
Holdings [Line Items]  
Percent of Net Asset Value 5.30%
C000117193 | Pennsylvania  
Holdings [Line Items]  
Percent of Net Asset Value 5.00%
C000117193 | Illinois  
Holdings [Line Items]  
Percent of Net Asset Value 4.00%
C000117193 | Georgia  
Holdings [Line Items]  
Percent of Net Asset Value 4.00%
C000117193 | Investment TypeOther Holdings Grouping  
Holdings [Line Items]  
Percent of Net Asset Value 47.20%
C000117193 | Hospital Revenue  
Holdings [Line Items]  
Percent of Net Asset Value 21.10%
C000117193 | Ground Transportation Revenue  
Holdings [Line Items]  
Percent of Net Asset Value 11.40%
C000117193 | Educational Revenue  
Holdings [Line Items]  
Percent of Net Asset Value 9.80%
C000117193 | Dedicated Tax Revenue  
Holdings [Line Items]  
Percent of Net Asset Value 9.20%
C000117193 | Housing Finance Revenue  
Holdings [Line Items]  
Percent of Net Asset Value 9.70%
C000117193 | Industrial & Pollution Control Revenue  
Holdings [Line Items]  
Percent of Net Asset Value 8.00%
C000117193 | General Obligations - State  
Holdings [Line Items]  
Percent of Net Asset Value 4.00%
C000117193 | Genl Obligations - Local  
Holdings [Line Items]  
Percent of Net Asset Value 3.00%
C000117193 | Water & Sewer Revenue  
Holdings [Line Items]  
Percent of Net Asset Value 1.70%
C000117193 | Other 2  
Holdings [Line Items]  
Percent of Net Asset Value 22.10%
C000177208 | Puerto Rico  
Holdings [Line Items]  
Percent of Net Asset Value 9.10%
C000177208 | California  
Holdings [Line Items]  
Percent of Net Asset Value 7.50%
C000177208 | Texas  
Holdings [Line Items]  
Percent of Net Asset Value 6.30%
C000177208 | Florida  
Holdings [Line Items]  
Percent of Net Asset Value 6.20%
C000177208 | Wisconsin  
Holdings [Line Items]  
Percent of Net Asset Value 5.40%
C000177208 | Ohio  
Holdings [Line Items]  
Percent of Net Asset Value 5.30%
C000177208 | Pennsylvania  
Holdings [Line Items]  
Percent of Net Asset Value 5.00%
C000177208 | Illinois  
Holdings [Line Items]  
Percent of Net Asset Value 4.00%
C000177208 | Georgia  
Holdings [Line Items]  
Percent of Net Asset Value 4.00%
C000177208 | Investment TypeOther Holdings Grouping  
Holdings [Line Items]  
Percent of Net Asset Value 47.20%
C000177208 | Hospital Revenue  
Holdings [Line Items]  
Percent of Net Asset Value 21.10%
C000177208 | Ground Transportation Revenue  
Holdings [Line Items]  
Percent of Net Asset Value 11.40%
C000177208 | Educational Revenue  
Holdings [Line Items]  
Percent of Net Asset Value 9.80%
C000177208 | Dedicated Tax Revenue  
Holdings [Line Items]  
Percent of Net Asset Value 9.20%
C000177208 | Housing Finance Revenue  
Holdings [Line Items]  
Percent of Net Asset Value 9.70%
C000177208 | Industrial & Pollution Control Revenue  
Holdings [Line Items]  
Percent of Net Asset Value 8.00%
C000177208 | General Obligations - State  
Holdings [Line Items]  
Percent of Net Asset Value 4.00%
C000177208 | Genl Obligations - Local  
Holdings [Line Items]  
Percent of Net Asset Value 3.00%
C000177208 | Water & Sewer Revenue  
Holdings [Line Items]  
Percent of Net Asset Value 1.70%
C000177208 | Other 2  
Holdings [Line Items]  
Percent of Net Asset Value 22.10%