v3.26.3
Shareholder Report, Holdings (Details)
Aug. 31, 2026
C000016814 | NR  
Holdings [Line Items]  
Percent of Net Asset Value 13.00%
C000016814 | AAA  
Holdings [Line Items]  
Percent of Net Asset Value 3.00%
C000016814 | AA  
Holdings [Line Items]  
Percent of Net Asset Value 52.00%
C000016814 | A  
Holdings [Line Items]  
Percent of Net Asset Value 21.00%
C000016814 | BBB  
Holdings [Line Items]  
Percent of Net Asset Value 9.00%
C000016814 | BB  
Holdings [Line Items]  
Percent of Net Asset Value 1.00%
C000016814 | Revenue Bonds  
Holdings [Line Items]  
Percent of Net Asset Value 73.00%
C000016814 | General Obligation Bonds  
Holdings [Line Items]  
Percent of Net Asset Value 19.00%
C000016814 | Lease Obligations  
Holdings [Line Items]  
Percent of Net Asset Value 9.00%
C000016814 | Variable Rate Demand Notes  
Holdings [Line Items]  
Percent of Net Asset Value 4.00%
C000016814 | Escrow to Maturity/Prefunded Bonds  
Holdings [Line Items]  
Percent of Net Asset Value 1.00%
C000016814 | Other  
Holdings [Line Items]  
Percent of Net Asset Value 0.00%
C000016814 | Other Assets and Liabilities, Net  
Holdings [Line Items]  
Percent of Net Asset Value (6.00%)
C000016816 | NR  
Holdings [Line Items]  
Percent of Net Asset Value 13.00%
C000016816 | AAA  
Holdings [Line Items]  
Percent of Net Asset Value 3.00%
C000016816 | AA  
Holdings [Line Items]  
Percent of Net Asset Value 52.00%
C000016816 | A  
Holdings [Line Items]  
Percent of Net Asset Value 21.00%
C000016816 | BBB  
Holdings [Line Items]  
Percent of Net Asset Value 9.00%
C000016816 | BB  
Holdings [Line Items]  
Percent of Net Asset Value 1.00%
C000016816 | Revenue Bonds  
Holdings [Line Items]  
Percent of Net Asset Value 73.00%
C000016816 | General Obligation Bonds  
Holdings [Line Items]  
Percent of Net Asset Value 19.00%
C000016816 | Lease Obligations  
Holdings [Line Items]  
Percent of Net Asset Value 9.00%
C000016816 | Variable Rate Demand Notes  
Holdings [Line Items]  
Percent of Net Asset Value 4.00%
C000016816 | Escrow to Maturity/Prefunded Bonds  
Holdings [Line Items]  
Percent of Net Asset Value 1.00%
C000016816 | Other  
Holdings [Line Items]  
Percent of Net Asset Value 0.00%
C000016816 | Other Assets and Liabilities, Net  
Holdings [Line Items]  
Percent of Net Asset Value (6.00%)
C000016817 | NR  
Holdings [Line Items]  
Percent of Net Asset Value 13.00%
C000016817 | AAA  
Holdings [Line Items]  
Percent of Net Asset Value 3.00%
C000016817 | AA  
Holdings [Line Items]  
Percent of Net Asset Value 52.00%
C000016817 | A  
Holdings [Line Items]  
Percent of Net Asset Value 21.00%
C000016817 | BBB  
Holdings [Line Items]  
Percent of Net Asset Value 9.00%
C000016817 | BB  
Holdings [Line Items]  
Percent of Net Asset Value 1.00%
C000016817 | Revenue Bonds  
Holdings [Line Items]  
Percent of Net Asset Value 73.00%
C000016817 | General Obligation Bonds  
Holdings [Line Items]  
Percent of Net Asset Value 19.00%
C000016817 | Lease Obligations  
Holdings [Line Items]  
Percent of Net Asset Value 9.00%
C000016817 | Variable Rate Demand Notes  
Holdings [Line Items]  
Percent of Net Asset Value 4.00%
C000016817 | Escrow to Maturity/Prefunded Bonds  
Holdings [Line Items]  
Percent of Net Asset Value 1.00%
C000016817 | Other  
Holdings [Line Items]  
Percent of Net Asset Value 0.00%
C000016817 | Other Assets and Liabilities, Net  
Holdings [Line Items]  
Percent of Net Asset Value (6.00%)
C000223770 | NR  
Holdings [Line Items]  
Percent of Net Asset Value 13.00%
C000223770 | AAA  
Holdings [Line Items]  
Percent of Net Asset Value 3.00%
C000223770 | AA  
Holdings [Line Items]  
Percent of Net Asset Value 52.00%
C000223770 | A  
Holdings [Line Items]  
Percent of Net Asset Value 21.00%
C000223770 | BBB  
Holdings [Line Items]  
Percent of Net Asset Value 9.00%
C000223770 | BB  
Holdings [Line Items]  
Percent of Net Asset Value 1.00%
C000223770 | Revenue Bonds  
Holdings [Line Items]  
Percent of Net Asset Value 73.00%
C000223770 | General Obligation Bonds  
Holdings [Line Items]  
Percent of Net Asset Value 19.00%
C000223770 | Lease Obligations  
Holdings [Line Items]  
Percent of Net Asset Value 9.00%
C000223770 | Variable Rate Demand Notes  
Holdings [Line Items]  
Percent of Net Asset Value 4.00%
C000223770 | Escrow to Maturity/Prefunded Bonds  
Holdings [Line Items]  
Percent of Net Asset Value 1.00%
C000223770 | Other  
Holdings [Line Items]  
Percent of Net Asset Value 0.00%
C000223770 | Other Assets and Liabilities, Net  
Holdings [Line Items]  
Percent of Net Asset Value (6.00%)