v3.25.1
Shareholder Report, Holdings (Details)
Feb. 28, 2025
C000070760 [Member] | Hospital [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 18.40%
C000070760 [Member] | Water And Sewer [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 8.80%
C000070760 [Member] | Senior Care [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 7.60%
C000070760 [Member] | Multifamily [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 4.80%
C000070760 [Member] | Public Power [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 3.10%
C000070760 [Member] | Higher Education [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 5.50%
C000070760 [Member] | Dedicated Tax [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 9.20%
C000070760 [Member] | Industrial Development Bond Pollution Control Revenue [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 2.50%
C000070760 [Member] | General Obligation Local [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 19.70%
C000070760 [Member] | General Obligation State [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 11.70%
C000070760 [Member] | General Obligation State Appropriation [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 2.90%
C000024703 [Member] | Hospital [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 18.40%
C000024703 [Member] | Water And Sewer [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 8.80%
C000024703 [Member] | Senior Care [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 7.60%
C000024703 [Member] | Multifamily [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 4.80%
C000024703 [Member] | Public Power [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 3.10%
C000024703 [Member] | Higher Education [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 5.50%
C000024703 [Member] | Dedicated Tax [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 9.20%
C000024703 [Member] | Industrial Development Bond Pollution Control Revenue [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 2.50%
C000024703 [Member] | General Obligation Local [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 19.70%
C000024703 [Member] | General Obligation State [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 11.70%
C000024703 [Member] | General Obligation State Appropriation [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 2.90%
C000219236 [Member] | Hospital [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 18.40%
C000219236 [Member] | Water And Sewer [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 8.80%
C000219236 [Member] | Senior Care [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 7.60%
C000219236 [Member] | Multifamily [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 4.80%
C000219236 [Member] | Public Power [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 3.10%
C000219236 [Member] | Higher Education [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 5.50%
C000219236 [Member] | Dedicated Tax [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 9.20%
C000219236 [Member] | Industrial Development Bond Pollution Control Revenue [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 2.50%
C000219236 [Member] | General Obligation Local [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 19.70%
C000219236 [Member] | General Obligation State [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 11.70%
C000219236 [Member] | General Obligation State Appropriation [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 2.90%
C000024704 [Member] | Hospital [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 14.80%
C000024704 [Member] | Water And Sewer [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 10.80%
C000024704 [Member] | Senior Care [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 5.80%
C000024704 [Member] | Higher Education [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 6.30%
C000024704 [Member] | Toll Road [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 10.20%
C000024704 [Member] | Airport [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 5.10%
C000024704 [Member] | Other Transportation [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 3.80%
C000024704 [Member] | Dedicated Tax [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 3.90%
C000024704 [Member] | General Obligation Local [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 23.40%
C000024704 [Member] | General Obligation State [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 6.00%
C000024704 [Member] | General Obligation State Appropriation [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 3.00%
C000219237 [Member] | Hospital [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 14.80%
C000219237 [Member] | Water And Sewer [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 10.80%
C000219237 [Member] | Senior Care [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 5.80%
C000219237 [Member] | Higher Education [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 6.30%
C000219237 [Member] | Toll Road [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 10.20%
C000219237 [Member] | Airport [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 5.10%
C000219237 [Member] | Other Transportation [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 3.80%
C000219237 [Member] | Dedicated Tax [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 3.90%
C000219237 [Member] | General Obligation Local [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 23.40%
C000219237 [Member] | General Obligation State [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 6.00%
C000219237 [Member] | General Obligation State Appropriation [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 3.00%
C000034361 [Member] | Hospital [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 9.00%
C000034361 [Member] | Water And Sewer [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 3.30%
C000034361 [Member] | Senior Care [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 11.30%
C000034361 [Member] | Toll Road [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 3.50%
C000034361 [Member] | Airport [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 7.60%
C000034361 [Member] | Primary Secondary Education [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 9.90%
C000034361 [Member] | Tobacco [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 4.60%
C000034361 [Member] | Dedicated Tax [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 16.70%
C000034361 [Member] | Industrial Development Bond Pollution Control Revenue [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 10.70%
C000034361 [Member] | General Obligation Local [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 4.90%
C000034361 [Member] | General Obligation State [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 4.70%
C000034363 [Member] | Hospital [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 9.00%
C000034363 [Member] | Water And Sewer [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 3.30%
C000034363 [Member] | Senior Care [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 11.30%
C000034363 [Member] | Toll Road [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 3.50%
C000034363 [Member] | Airport [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 7.60%
C000034363 [Member] | Primary Secondary Education [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 9.90%
C000034363 [Member] | Tobacco [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 4.60%
C000034363 [Member] | Dedicated Tax [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 16.70%
C000034363 [Member] | Industrial Development Bond Pollution Control Revenue [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 10.70%
C000034363 [Member] | General Obligation Local [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 4.90%
C000034363 [Member] | General Obligation State [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 4.70%
C000034364 [Member] | Hospital [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 9.00%
C000034364 [Member] | Water And Sewer [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 3.30%
C000034364 [Member] | Senior Care [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 11.30%
C000034364 [Member] | Toll Road [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 3.50%
C000034364 [Member] | Airport [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 7.60%
C000034364 [Member] | Primary Secondary Education [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 9.90%
C000034364 [Member] | Tobacco [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 4.60%
C000034364 [Member] | Dedicated Tax [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 16.70%
C000034364 [Member] | Industrial Development Bond Pollution Control Revenue [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 10.70%
C000034364 [Member] | General Obligation Local [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 4.90%
C000034364 [Member] | General Obligation State [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 4.70%
C000130166 [Member] | Hospital [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 9.00%
C000130166 [Member] | Water And Sewer [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 3.30%
C000130166 [Member] | Senior Care [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 11.30%
C000130166 [Member] | Toll Road [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 3.50%
C000130166 [Member] | Airport [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 7.60%
C000130166 [Member] | Primary Secondary Education [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 9.90%
C000130166 [Member] | Tobacco [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 4.60%
C000130166 [Member] | Dedicated Tax [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 16.70%
C000130166 [Member] | Industrial Development Bond Pollution Control Revenue [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 10.70%
C000130166 [Member] | General Obligation Local [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 4.90%
C000130166 [Member] | General Obligation State [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 4.70%