v3.25.1
Shareholder Report, Holdings (Details)
Mar. 31, 2025
C000079007 [Member] | U S Related [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 2.40%
C000079007 [Member] | Net Other Assets and Liabilities State Allocation [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 5.50%
C000079007 [Member] | Transportation Sector [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 5.50%
C000079007 [Member] | Utilities Sector [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 3.40%
C000079007 [Member] | Medical [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 11.80%
C000079007 [Member] | Education [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 11.00%
C000079007 [Member] | Development [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 10.40%
C000079007 [Member] | Power [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 5.90%
C000079007 [Member] | Airport [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 5.40%
C000079007 [Member] | Nursing Homes [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 4.80%
C000079007 [Member] | Housing [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 3.00%
C000079007 [Member] | School District [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 2.60%
C000079007 [Member] | Tobacco Settlement [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 1.30%
C000079007 [Member] | ALABAMA  
Holdings [Line Items]  
Percent of Net Asset Value 2.90%
C000079007 [Member] | ARIZONA  
Holdings [Line Items]  
Percent of Net Asset Value 4.00%
C000079007 [Member] | CALIFORNIA  
Holdings [Line Items]  
Percent of Net Asset Value 3.90%
C000079007 [Member] | CONNECTICUT  
Holdings [Line Items]  
Percent of Net Asset Value 1.50%
C000079007 [Member] | FLORIDA  
Holdings [Line Items]  
Percent of Net Asset Value 6.20%
C000079007 [Member] | ILLINOIS  
Holdings [Line Items]  
Percent of Net Asset Value 6.20%
C000079007 [Member] | INDIANA  
Holdings [Line Items]  
Percent of Net Asset Value 3.40%
C000079007 [Member] | IOWA  
Holdings [Line Items]  
Percent of Net Asset Value 2.70%
C000079007 [Member] | MARYLAND  
Holdings [Line Items]  
Percent of Net Asset Value 1.10%
C000079007 [Member] | MASSACHUSETTS  
Holdings [Line Items]  
Percent of Net Asset Value 1.40%
C000079007 [Member] | MICHIGAN  
Holdings [Line Items]  
Percent of Net Asset Value 3.00%
C000079007 [Member] | MISSOURI  
Holdings [Line Items]  
Percent of Net Asset Value 1.30%
C000079007 [Member] | NEVADA  
Holdings [Line Items]  
Percent of Net Asset Value 2.10%
C000079007 [Member] | NEW JERSEY  
Holdings [Line Items]  
Percent of Net Asset Value 4.10%
C000079007 [Member] | NEW YORK  
Holdings [Line Items]  
Percent of Net Asset Value 7.40%
C000079007 [Member] | NORTH CAROLINA  
Holdings [Line Items]  
Percent of Net Asset Value 2.60%
C000079007 [Member] | OHIO  
Holdings [Line Items]  
Percent of Net Asset Value 3.20%
C000079007 [Member] | PENNSYLVANIA  
Holdings [Line Items]  
Percent of Net Asset Value 8.40%
C000079007 [Member] | SOUTH CAROLINA  
Holdings [Line Items]  
Percent of Net Asset Value 3.20%
C000079007 [Member] | TENNESSEE  
Holdings [Line Items]  
Percent of Net Asset Value 3.20%
C000079007 [Member] | TEXAS  
Holdings [Line Items]  
Percent of Net Asset Value 12.40%
C000079007 [Member] | WASHINGTON  
Holdings [Line Items]  
Percent of Net Asset Value 4.60%
C000079007 [Member] | WISCONSIN  
Holdings [Line Items]  
Percent of Net Asset Value 3.30%
C000079007 [Member] | Student Loan [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 6.80%
C000079007 [Member] | General Obligation [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 12.50%
C000079007 [Member] | Net Other Assets and Liabilities [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 15.60%
C000000147 [Member] | U S Related [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 2.40%
C000000147 [Member] | Net Other Assets and Liabilities State Allocation [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 5.50%
C000000147 [Member] | Transportation Sector [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 5.50%
C000000147 [Member] | Utilities Sector [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 3.40%
C000000147 [Member] | Medical [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 11.80%
C000000147 [Member] | Education [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 11.00%
C000000147 [Member] | Development [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 10.40%
C000000147 [Member] | Power [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 5.90%
C000000147 [Member] | Airport [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 5.40%
C000000147 [Member] | Nursing Homes [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 4.80%
C000000147 [Member] | Housing [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 3.00%
C000000147 [Member] | School District [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 2.60%
C000000147 [Member] | Tobacco Settlement [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 1.30%
C000000147 [Member] | ALABAMA  
Holdings [Line Items]  
Percent of Net Asset Value 2.90%
C000000147 [Member] | ARIZONA  
Holdings [Line Items]  
Percent of Net Asset Value 4.00%
C000000147 [Member] | CALIFORNIA  
Holdings [Line Items]  
Percent of Net Asset Value 3.90%
C000000147 [Member] | CONNECTICUT  
Holdings [Line Items]  
Percent of Net Asset Value 1.50%
C000000147 [Member] | FLORIDA  
Holdings [Line Items]  
Percent of Net Asset Value 6.20%
C000000147 [Member] | ILLINOIS  
Holdings [Line Items]  
Percent of Net Asset Value 6.20%
C000000147 [Member] | INDIANA  
Holdings [Line Items]  
Percent of Net Asset Value 3.40%
C000000147 [Member] | IOWA  
Holdings [Line Items]  
Percent of Net Asset Value 2.70%
C000000147 [Member] | MARYLAND  
Holdings [Line Items]  
Percent of Net Asset Value 1.10%
C000000147 [Member] | MASSACHUSETTS  
Holdings [Line Items]  
Percent of Net Asset Value 1.40%
C000000147 [Member] | MICHIGAN  
Holdings [Line Items]  
Percent of Net Asset Value 3.00%
C000000147 [Member] | MISSOURI  
Holdings [Line Items]  
Percent of Net Asset Value 1.30%
C000000147 [Member] | NEVADA  
Holdings [Line Items]  
Percent of Net Asset Value 2.10%
C000000147 [Member] | NEW JERSEY  
Holdings [Line Items]  
Percent of Net Asset Value 4.10%
C000000147 [Member] | NEW YORK  
Holdings [Line Items]  
Percent of Net Asset Value 7.40%
C000000147 [Member] | NORTH CAROLINA  
Holdings [Line Items]  
Percent of Net Asset Value 2.60%
C000000147 [Member] | OHIO  
Holdings [Line Items]  
Percent of Net Asset Value 3.20%
C000000147 [Member] | PENNSYLVANIA  
Holdings [Line Items]  
Percent of Net Asset Value 8.40%
C000000147 [Member] | SOUTH CAROLINA  
Holdings [Line Items]  
Percent of Net Asset Value 3.20%
C000000147 [Member] | TENNESSEE  
Holdings [Line Items]  
Percent of Net Asset Value 3.20%
C000000147 [Member] | TEXAS  
Holdings [Line Items]  
Percent of Net Asset Value 12.40%
C000000147 [Member] | WASHINGTON  
Holdings [Line Items]  
Percent of Net Asset Value 4.60%
C000000147 [Member] | WISCONSIN  
Holdings [Line Items]  
Percent of Net Asset Value 3.30%
C000000147 [Member] | Student Loan [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 6.80%
C000000147 [Member] | General Obligation [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 12.50%
C000000147 [Member] | Net Other Assets and Liabilities [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 15.60%
C000073380 [Member] | U S Related [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 2.40%
C000073380 [Member] | Net Other Assets and Liabilities State Allocation [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 5.50%
C000073380 [Member] | Transportation Sector [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 5.50%
C000073380 [Member] | Utilities Sector [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 3.40%
C000073380 [Member] | Medical [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 11.80%
C000073380 [Member] | Education [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 11.00%
C000073380 [Member] | Development [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 10.40%
C000073380 [Member] | Power [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 5.90%
C000073380 [Member] | Airport [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 5.40%
C000073380 [Member] | Nursing Homes [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 4.80%
C000073380 [Member] | Housing [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 3.00%
C000073380 [Member] | School District [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 2.60%
C000073380 [Member] | Tobacco Settlement [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 1.30%
C000073380 [Member] | ALABAMA  
Holdings [Line Items]  
Percent of Net Asset Value 2.90%
C000073380 [Member] | ARIZONA  
Holdings [Line Items]  
Percent of Net Asset Value 4.00%
C000073380 [Member] | CALIFORNIA  
Holdings [Line Items]  
Percent of Net Asset Value 3.90%
C000073380 [Member] | CONNECTICUT  
Holdings [Line Items]  
Percent of Net Asset Value 1.50%
C000073380 [Member] | FLORIDA  
Holdings [Line Items]  
Percent of Net Asset Value 6.20%
C000073380 [Member] | ILLINOIS  
Holdings [Line Items]  
Percent of Net Asset Value 6.20%
C000073380 [Member] | INDIANA  
Holdings [Line Items]  
Percent of Net Asset Value 3.40%
C000073380 [Member] | IOWA  
Holdings [Line Items]  
Percent of Net Asset Value 2.70%
C000073380 [Member] | MARYLAND  
Holdings [Line Items]  
Percent of Net Asset Value 1.10%
C000073380 [Member] | MASSACHUSETTS  
Holdings [Line Items]  
Percent of Net Asset Value 1.40%
C000073380 [Member] | MICHIGAN  
Holdings [Line Items]  
Percent of Net Asset Value 3.00%
C000073380 [Member] | MISSOURI  
Holdings [Line Items]  
Percent of Net Asset Value 1.30%
C000073380 [Member] | NEVADA  
Holdings [Line Items]  
Percent of Net Asset Value 2.10%
C000073380 [Member] | NEW JERSEY  
Holdings [Line Items]  
Percent of Net Asset Value 4.10%
C000073380 [Member] | NEW YORK  
Holdings [Line Items]  
Percent of Net Asset Value 7.40%
C000073380 [Member] | NORTH CAROLINA  
Holdings [Line Items]  
Percent of Net Asset Value 2.60%
C000073380 [Member] | OHIO  
Holdings [Line Items]  
Percent of Net Asset Value 3.20%
C000073380 [Member] | PENNSYLVANIA  
Holdings [Line Items]  
Percent of Net Asset Value 8.40%
C000073380 [Member] | SOUTH CAROLINA  
Holdings [Line Items]  
Percent of Net Asset Value 3.20%
C000073380 [Member] | TENNESSEE  
Holdings [Line Items]  
Percent of Net Asset Value 3.20%
C000073380 [Member] | TEXAS  
Holdings [Line Items]  
Percent of Net Asset Value 12.40%
C000073380 [Member] | WASHINGTON  
Holdings [Line Items]  
Percent of Net Asset Value 4.60%
C000073380 [Member] | WISCONSIN  
Holdings [Line Items]  
Percent of Net Asset Value 3.30%
C000073380 [Member] | Student Loan [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 6.80%
C000073380 [Member] | General Obligation [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 12.50%
C000073380 [Member] | Net Other Assets and Liabilities [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 15.60%
C000130293 [Member] | U S Related [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 2.40%
C000130293 [Member] | Net Other Assets and Liabilities State Allocation [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 5.50%
C000130293 [Member] | Transportation Sector [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 5.50%
C000130293 [Member] | Utilities Sector [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 3.40%
C000130293 [Member] | Medical [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 11.80%
C000130293 [Member] | Education [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 11.00%
C000130293 [Member] | Development [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 10.40%
C000130293 [Member] | Power [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 5.90%
C000130293 [Member] | Airport [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 5.40%
C000130293 [Member] | Nursing Homes [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 4.80%
C000130293 [Member] | Housing [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 3.00%
C000130293 [Member] | School District [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 2.60%
C000130293 [Member] | Tobacco Settlement [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 1.30%
C000130293 [Member] | ALABAMA  
Holdings [Line Items]  
Percent of Net Asset Value 2.90%
C000130293 [Member] | ARIZONA  
Holdings [Line Items]  
Percent of Net Asset Value 4.00%
C000130293 [Member] | CALIFORNIA  
Holdings [Line Items]  
Percent of Net Asset Value 3.90%
C000130293 [Member] | CONNECTICUT  
Holdings [Line Items]  
Percent of Net Asset Value 1.50%
C000130293 [Member] | FLORIDA  
Holdings [Line Items]  
Percent of Net Asset Value 6.20%
C000130293 [Member] | ILLINOIS  
Holdings [Line Items]  
Percent of Net Asset Value 6.20%
C000130293 [Member] | INDIANA  
Holdings [Line Items]  
Percent of Net Asset Value 3.40%
C000130293 [Member] | IOWA  
Holdings [Line Items]  
Percent of Net Asset Value 2.70%
C000130293 [Member] | MARYLAND  
Holdings [Line Items]  
Percent of Net Asset Value 1.10%
C000130293 [Member] | MASSACHUSETTS  
Holdings [Line Items]  
Percent of Net Asset Value 1.40%
C000130293 [Member] | MICHIGAN  
Holdings [Line Items]  
Percent of Net Asset Value 3.00%
C000130293 [Member] | MISSOURI  
Holdings [Line Items]  
Percent of Net Asset Value 1.30%
C000130293 [Member] | NEVADA  
Holdings [Line Items]  
Percent of Net Asset Value 2.10%
C000130293 [Member] | NEW JERSEY  
Holdings [Line Items]  
Percent of Net Asset Value 4.10%
C000130293 [Member] | NEW YORK  
Holdings [Line Items]  
Percent of Net Asset Value 7.40%
C000130293 [Member] | NORTH CAROLINA  
Holdings [Line Items]  
Percent of Net Asset Value 2.60%
C000130293 [Member] | OHIO  
Holdings [Line Items]  
Percent of Net Asset Value 3.20%
C000130293 [Member] | PENNSYLVANIA  
Holdings [Line Items]  
Percent of Net Asset Value 8.40%
C000130293 [Member] | SOUTH CAROLINA  
Holdings [Line Items]  
Percent of Net Asset Value 3.20%
C000130293 [Member] | TENNESSEE  
Holdings [Line Items]  
Percent of Net Asset Value 3.20%
C000130293 [Member] | TEXAS  
Holdings [Line Items]  
Percent of Net Asset Value 12.40%
C000130293 [Member] | WASHINGTON  
Holdings [Line Items]  
Percent of Net Asset Value 4.60%
C000130293 [Member] | WISCONSIN  
Holdings [Line Items]  
Percent of Net Asset Value 3.30%
C000130293 [Member] | Student Loan [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 6.80%
C000130293 [Member] | General Obligation [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 12.50%
C000130293 [Member] | Net Other Assets and Liabilities [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 15.60%