v3.26.3
Shareholder Report, Holdings (Details)
Jul. 31, 2026
C000013133 | Not Rated  
Holdings [Line Items]  
Percent of Total Investments 5.40%
C000013133 | BB  
Holdings [Line Items]  
Percent of Total Investments 2.80%
C000013133 | BBB  
Holdings [Line Items]  
Percent of Total Investments 7.80%
C000013133 | A  
Holdings [Line Items]  
Percent of Total Investments 9.40%
C000013133 | AA  
Holdings [Line Items]  
Percent of Total Investments 57.70%
C000013133 | AAA  
Holdings [Line Items]  
Percent of Total Investments 16.90%
C000013133 | Industry Other Line  
Holdings [Line Items]  
Percent of Total Investments 7.90%
C000013133 | Electric Utilities  
Holdings [Line Items]  
Percent of Total Investments 4.00%
C000013133 | Transportation  
Holdings [Line Items]  
Percent of Total Investments 4.60%
C000013133 | Industrial Development Revenue  
Holdings [Line Items]  
Percent of Total Investments 4.70%
C000013133 | Housing  
Holdings [Line Items]  
Percent of Total Investments 6.70%
C000013133 | Water and Sewer  
Holdings [Line Items]  
Percent of Total Investments 8.30%
C000013133 | Special Tax Revenue  
Holdings [Line Items]  
Percent of Total Investments 11.20%
C000013133 | Hospital  
Holdings [Line Items]  
Percent of Total Investments 12.10%
C000013133 | Education  
Holdings [Line Items]  
Percent of Total Investments 15.00%
C000013133 | General Obligations  
Holdings [Line Items]  
Percent of Total Investments 25.50%
C000013135 | Not Rated  
Holdings [Line Items]  
Percent of Total Investments 5.40%
C000013135 | BB  
Holdings [Line Items]  
Percent of Total Investments 2.80%
C000013135 | BBB  
Holdings [Line Items]  
Percent of Total Investments 7.80%
C000013135 | A  
Holdings [Line Items]  
Percent of Total Investments 9.40%
C000013135 | AA  
Holdings [Line Items]  
Percent of Total Investments 57.70%
C000013135 | AAA  
Holdings [Line Items]  
Percent of Total Investments 16.90%
C000013135 | Industry Other Line  
Holdings [Line Items]  
Percent of Total Investments 7.90%
C000013135 | Electric Utilities  
Holdings [Line Items]  
Percent of Total Investments 4.00%
C000013135 | Transportation  
Holdings [Line Items]  
Percent of Total Investments 4.60%
C000013135 | Industrial Development Revenue  
Holdings [Line Items]  
Percent of Total Investments 4.70%
C000013135 | Housing  
Holdings [Line Items]  
Percent of Total Investments 6.70%
C000013135 | Water and Sewer  
Holdings [Line Items]  
Percent of Total Investments 8.30%
C000013135 | Special Tax Revenue  
Holdings [Line Items]  
Percent of Total Investments 11.20%
C000013135 | Hospital  
Holdings [Line Items]  
Percent of Total Investments 12.10%
C000013135 | Education  
Holdings [Line Items]  
Percent of Total Investments 15.00%
C000013135 | General Obligations  
Holdings [Line Items]  
Percent of Total Investments 25.50%
C000092720 | Not Rated  
Holdings [Line Items]  
Percent of Total Investments 5.40%
C000092720 | BB  
Holdings [Line Items]  
Percent of Total Investments 2.80%
C000092720 | BBB  
Holdings [Line Items]  
Percent of Total Investments 7.80%
C000092720 | A  
Holdings [Line Items]  
Percent of Total Investments 9.40%
C000092720 | AA  
Holdings [Line Items]  
Percent of Total Investments 57.70%
C000092720 | AAA  
Holdings [Line Items]  
Percent of Total Investments 16.90%
C000092720 | Industry Other Line  
Holdings [Line Items]  
Percent of Total Investments 7.90%
C000092720 | Electric Utilities  
Holdings [Line Items]  
Percent of Total Investments 4.00%
C000092720 | Transportation  
Holdings [Line Items]  
Percent of Total Investments 4.60%
C000092720 | Industrial Development Revenue  
Holdings [Line Items]  
Percent of Total Investments 4.70%
C000092720 | Housing  
Holdings [Line Items]  
Percent of Total Investments 6.70%
C000092720 | Water and Sewer  
Holdings [Line Items]  
Percent of Total Investments 8.30%
C000092720 | Special Tax Revenue  
Holdings [Line Items]  
Percent of Total Investments 11.20%
C000092720 | Hospital  
Holdings [Line Items]  
Percent of Total Investments 12.10%
C000092720 | Education  
Holdings [Line Items]  
Percent of Total Investments 15.00%
C000092720 | General Obligations  
Holdings [Line Items]  
Percent of Total Investments 25.50%
C000013173 | Not Rated  
Holdings [Line Items]  
Percent of Total Investments 6.70%
C000013173 | BB  
Holdings [Line Items]  
Percent of Total Investments 1.50%
C000013173 | BBB  
Holdings [Line Items]  
Percent of Total Investments 3.70%
C000013173 | A  
Holdings [Line Items]  
Percent of Total Investments 23.20%
C000013173 | AA  
Holdings [Line Items]  
Percent of Total Investments 52.00%
C000013173 | AAA  
Holdings [Line Items]  
Percent of Total Investments 12.90%
C000013173 | Industry Other Line  
Holdings [Line Items]  
Percent of Total Investments 6.30%
C000013173 | Housing  
Holdings [Line Items]  
Percent of Total Investments 9.00%
C000013173 | Water and Sewer  
Holdings [Line Items]  
Percent of Total Investments 6.30%
C000013173 | Special Tax Revenue  
Holdings [Line Items]  
Percent of Total Investments 5.30%
C000013173 | Hospital  
Holdings [Line Items]  
Percent of Total Investments 9.30%
C000013173 | Education  
Holdings [Line Items]  
Percent of Total Investments 25.10%
C000013173 | General Obligations  
Holdings [Line Items]  
Percent of Total Investments 35.20%
C000013173 | Senior Living/Life Care  
Holdings [Line Items]  
Percent of Total Investments 3.50%
C000013172 | Not Rated  
Holdings [Line Items]  
Percent of Total Investments 6.70%
C000013172 | BB  
Holdings [Line Items]  
Percent of Total Investments 1.50%
C000013172 | BBB  
Holdings [Line Items]  
Percent of Total Investments 3.70%
C000013172 | A  
Holdings [Line Items]  
Percent of Total Investments 23.20%
C000013172 | AA  
Holdings [Line Items]  
Percent of Total Investments 52.00%
C000013172 | AAA  
Holdings [Line Items]  
Percent of Total Investments 12.90%
C000013172 | Industry Other Line  
Holdings [Line Items]  
Percent of Total Investments 6.30%
C000013172 | Housing  
Holdings [Line Items]  
Percent of Total Investments 9.00%
C000013172 | Water and Sewer  
Holdings [Line Items]  
Percent of Total Investments 6.30%
C000013172 | Special Tax Revenue  
Holdings [Line Items]  
Percent of Total Investments 5.30%
C000013172 | Hospital  
Holdings [Line Items]  
Percent of Total Investments 9.30%
C000013172 | Education  
Holdings [Line Items]  
Percent of Total Investments 25.10%
C000013172 | General Obligations  
Holdings [Line Items]  
Percent of Total Investments 35.20%
C000013172 | Senior Living/Life Care  
Holdings [Line Items]  
Percent of Total Investments 3.50%
C000063955 | Not Rated  
Holdings [Line Items]  
Percent of Total Investments 6.70%
C000063955 | BB  
Holdings [Line Items]  
Percent of Total Investments 1.50%
C000063955 | BBB  
Holdings [Line Items]  
Percent of Total Investments 3.70%
C000063955 | A  
Holdings [Line Items]  
Percent of Total Investments 23.20%
C000063955 | AA  
Holdings [Line Items]  
Percent of Total Investments 52.00%
C000063955 | AAA  
Holdings [Line Items]  
Percent of Total Investments 12.90%
C000063955 | Industry Other Line  
Holdings [Line Items]  
Percent of Total Investments 6.30%
C000063955 | Housing  
Holdings [Line Items]  
Percent of Total Investments 9.00%
C000063955 | Water and Sewer  
Holdings [Line Items]  
Percent of Total Investments 6.30%
C000063955 | Special Tax Revenue  
Holdings [Line Items]  
Percent of Total Investments 5.30%
C000063955 | Hospital  
Holdings [Line Items]  
Percent of Total Investments 9.30%
C000063955 | Education  
Holdings [Line Items]  
Percent of Total Investments 25.10%
C000063955 | General Obligations  
Holdings [Line Items]  
Percent of Total Investments 35.20%
C000063955 | Senior Living/Life Care  
Holdings [Line Items]  
Percent of Total Investments 3.50%
C000013114 | Not Rated  
Holdings [Line Items]  
Percent of Total Investments 4.20%
C000013114 | BB  
Holdings [Line Items]  
Percent of Total Investments 0.60%
C000013114 | BBB  
Holdings [Line Items]  
Percent of Total Investments 1.00%
C000013114 | A  
Holdings [Line Items]  
Percent of Total Investments 17.60%
C000013114 | AA  
Holdings [Line Items]  
Percent of Total Investments 59.80%
C000013114 | AAA  
Holdings [Line Items]  
Percent of Total Investments 16.80%
C000013114 | Industry Other Line  
Holdings [Line Items]  
Percent of Total Investments 6.70%
C000013114 | Electric Utilities  
Holdings [Line Items]  
Percent of Total Investments 9.70%
C000013114 | Transportation  
Holdings [Line Items]  
Percent of Total Investments 6.20%
C000013114 | Housing  
Holdings [Line Items]  
Percent of Total Investments 4.30%
C000013114 | Special Tax Revenue  
Holdings [Line Items]  
Percent of Total Investments 3.50%
C000013114 | Hospital  
Holdings [Line Items]  
Percent of Total Investments 18.20%
C000013114 | Education  
Holdings [Line Items]  
Percent of Total Investments 10.70%
C000013114 | General Obligations  
Holdings [Line Items]  
Percent of Total Investments 36.60%
C000013114 | Lease Rev./Cert. of Participation  
Holdings [Line Items]  
Percent of Total Investments 4.10%
C000013116 | Not Rated  
Holdings [Line Items]  
Percent of Total Investments 4.20%
C000013116 | BB  
Holdings [Line Items]  
Percent of Total Investments 0.60%
C000013116 | BBB  
Holdings [Line Items]  
Percent of Total Investments 1.00%
C000013116 | A  
Holdings [Line Items]  
Percent of Total Investments 17.60%
C000013116 | AA  
Holdings [Line Items]  
Percent of Total Investments 59.80%
C000013116 | AAA  
Holdings [Line Items]  
Percent of Total Investments 16.80%
C000013116 | Industry Other Line  
Holdings [Line Items]  
Percent of Total Investments 6.70%
C000013116 | Electric Utilities  
Holdings [Line Items]  
Percent of Total Investments 9.70%
C000013116 | Transportation  
Holdings [Line Items]  
Percent of Total Investments 6.20%
C000013116 | Housing  
Holdings [Line Items]  
Percent of Total Investments 4.30%
C000013116 | Special Tax Revenue  
Holdings [Line Items]  
Percent of Total Investments 3.50%
C000013116 | Hospital  
Holdings [Line Items]  
Percent of Total Investments 18.20%
C000013116 | Education  
Holdings [Line Items]  
Percent of Total Investments 10.70%
C000013116 | General Obligations  
Holdings [Line Items]  
Percent of Total Investments 36.60%
C000013116 | Lease Rev./Cert. of Participation  
Holdings [Line Items]  
Percent of Total Investments 4.10%
C000092718 | Not Rated  
Holdings [Line Items]  
Percent of Total Investments 4.20%
C000092718 | BB  
Holdings [Line Items]  
Percent of Total Investments 0.60%
C000092718 | BBB  
Holdings [Line Items]  
Percent of Total Investments 1.00%
C000092718 | A  
Holdings [Line Items]  
Percent of Total Investments 17.60%
C000092718 | AA  
Holdings [Line Items]  
Percent of Total Investments 59.80%
C000092718 | AAA  
Holdings [Line Items]  
Percent of Total Investments 16.80%
C000092718 | Industry Other Line  
Holdings [Line Items]  
Percent of Total Investments 6.70%
C000092718 | Electric Utilities  
Holdings [Line Items]  
Percent of Total Investments 9.70%
C000092718 | Transportation  
Holdings [Line Items]  
Percent of Total Investments 6.20%
C000092718 | Housing  
Holdings [Line Items]  
Percent of Total Investments 4.30%
C000092718 | Special Tax Revenue  
Holdings [Line Items]  
Percent of Total Investments 3.50%
C000092718 | Hospital  
Holdings [Line Items]  
Percent of Total Investments 18.20%
C000092718 | Education  
Holdings [Line Items]  
Percent of Total Investments 10.70%
C000092718 | General Obligations  
Holdings [Line Items]  
Percent of Total Investments 36.60%
C000092718 | Lease Rev./Cert. of Participation  
Holdings [Line Items]  
Percent of Total Investments 4.10%
C000100969 | Not Rated  
Holdings [Line Items]  
Percent of Total Investments 6.30%
C000100969 | BB  
Holdings [Line Items]  
Percent of Total Investments 7.90%
C000100969 | BBB  
Holdings [Line Items]  
Percent of Total Investments 5.50%
C000100969 | A  
Holdings [Line Items]  
Percent of Total Investments 19.90%
C000100969 | AA  
Holdings [Line Items]  
Percent of Total Investments 51.40%
C000100969 | AAA  
Holdings [Line Items]  
Percent of Total Investments 8.30%
C000100969 | B  
Holdings [Line Items]  
Percent of Total Investments 0.70%
C000100969 | Industry Other Line  
Holdings [Line Items]  
Percent of Total Investments 5.10%
C000100969 | Transportation  
Holdings [Line Items]  
Percent of Total Investments 10.70%
C000100969 | Industrial Development Revenue  
Holdings [Line Items]  
Percent of Total Investments 3.60%
C000100969 | Housing  
Holdings [Line Items]  
Percent of Total Investments 9.90%
C000100969 | Water and Sewer  
Holdings [Line Items]  
Percent of Total Investments 3.40%
C000100969 | Special Tax Revenue  
Holdings [Line Items]  
Percent of Total Investments 6.30%
C000100969 | Hospital  
Holdings [Line Items]  
Percent of Total Investments 6.80%
C000100969 | Education  
Holdings [Line Items]  
Percent of Total Investments 9.20%
C000100969 | General Obligations  
Holdings [Line Items]  
Percent of Total Investments 27.10%
C000100969 | Senior Living/Life Care  
Holdings [Line Items]  
Percent of Total Investments 7.50%
C000100969 | Lease Rev./Cert. of Participation  
Holdings [Line Items]  
Percent of Total Investments 4.00%
C000100969 | Other Revenue  
Holdings [Line Items]  
Percent of Total Investments 6.40%
C000100970 | Not Rated  
Holdings [Line Items]  
Percent of Total Investments 6.30%
C000100970 | BB  
Holdings [Line Items]  
Percent of Total Investments 7.90%
C000100970 | BBB  
Holdings [Line Items]  
Percent of Total Investments 5.50%
C000100970 | A  
Holdings [Line Items]  
Percent of Total Investments 19.90%
C000100970 | AA  
Holdings [Line Items]  
Percent of Total Investments 51.40%
C000100970 | AAA  
Holdings [Line Items]  
Percent of Total Investments 8.30%
C000100970 | B  
Holdings [Line Items]  
Percent of Total Investments 0.70%
C000100970 | Industry Other Line  
Holdings [Line Items]  
Percent of Total Investments 5.10%
C000100970 | Transportation  
Holdings [Line Items]  
Percent of Total Investments 10.70%
C000100970 | Industrial Development Revenue  
Holdings [Line Items]  
Percent of Total Investments 3.60%
C000100970 | Housing  
Holdings [Line Items]  
Percent of Total Investments 9.90%
C000100970 | Water and Sewer  
Holdings [Line Items]  
Percent of Total Investments 3.40%
C000100970 | Special Tax Revenue  
Holdings [Line Items]  
Percent of Total Investments 6.30%
C000100970 | Hospital  
Holdings [Line Items]  
Percent of Total Investments 6.80%
C000100970 | Education  
Holdings [Line Items]  
Percent of Total Investments 9.20%
C000100970 | General Obligations  
Holdings [Line Items]  
Percent of Total Investments 27.10%
C000100970 | Senior Living/Life Care  
Holdings [Line Items]  
Percent of Total Investments 7.50%
C000100970 | Lease Rev./Cert. of Participation  
Holdings [Line Items]  
Percent of Total Investments 4.00%
C000100970 | Other Revenue  
Holdings [Line Items]  
Percent of Total Investments 6.40%
C000100971 | Not Rated  
Holdings [Line Items]  
Percent of Total Investments 6.30%
C000100971 | BB  
Holdings [Line Items]  
Percent of Total Investments 7.90%
C000100971 | BBB  
Holdings [Line Items]  
Percent of Total Investments 5.50%
C000100971 | A  
Holdings [Line Items]  
Percent of Total Investments 19.90%
C000100971 | AA  
Holdings [Line Items]  
Percent of Total Investments 51.40%
C000100971 | AAA  
Holdings [Line Items]  
Percent of Total Investments 8.30%
C000100971 | B  
Holdings [Line Items]  
Percent of Total Investments 0.70%
C000100971 | Industry Other Line  
Holdings [Line Items]  
Percent of Total Investments 5.10%
C000100971 | Transportation  
Holdings [Line Items]  
Percent of Total Investments 10.70%
C000100971 | Industrial Development Revenue  
Holdings [Line Items]  
Percent of Total Investments 3.60%
C000100971 | Housing  
Holdings [Line Items]  
Percent of Total Investments 9.90%
C000100971 | Water and Sewer  
Holdings [Line Items]  
Percent of Total Investments 3.40%
C000100971 | Special Tax Revenue  
Holdings [Line Items]  
Percent of Total Investments 6.30%
C000100971 | Hospital  
Holdings [Line Items]  
Percent of Total Investments 6.80%
C000100971 | Education  
Holdings [Line Items]  
Percent of Total Investments 9.20%
C000100971 | General Obligations  
Holdings [Line Items]  
Percent of Total Investments 27.10%
C000100971 | Senior Living/Life Care  
Holdings [Line Items]  
Percent of Total Investments 7.50%
C000100971 | Lease Rev./Cert. of Participation  
Holdings [Line Items]  
Percent of Total Investments 4.00%
C000100971 | Other Revenue  
Holdings [Line Items]  
Percent of Total Investments 6.40%
C000013127 | Not Rated  
Holdings [Line Items]  
Percent of Total Investments 4.00%
C000013127 | BB  
Holdings [Line Items]  
Percent of Total Investments 0.60%
C000013127 | BBB  
Holdings [Line Items]  
Percent of Total Investments 9.50%
C000013127 | A  
Holdings [Line Items]  
Percent of Total Investments 21.50%
C000013127 | AA  
Holdings [Line Items]  
Percent of Total Investments 59.50%
C000013127 | AAA  
Holdings [Line Items]  
Percent of Total Investments 4.90%
C000013127 | Industry Other Line  
Holdings [Line Items]  
Percent of Total Investments 9.30%
C000013127 | Transportation  
Holdings [Line Items]  
Percent of Total Investments 19.80%
C000013127 | Industrial Development Revenue  
Holdings [Line Items]  
Percent of Total Investments 5.70%
C000013127 | Housing  
Holdings [Line Items]  
Percent of Total Investments 6.00%
C000013127 | Special Tax Revenue  
Holdings [Line Items]  
Percent of Total Investments 6.00%
C000013127 | Hospital  
Holdings [Line Items]  
Percent of Total Investments 10.40%
C000013127 | Education  
Holdings [Line Items]  
Percent of Total Investments 15.70%
C000013127 | General Obligations  
Holdings [Line Items]  
Percent of Total Investments 15.10%
C000013127 | Lease Rev./Cert. of Participation  
Holdings [Line Items]  
Percent of Total Investments 12.00%
C000013129 | Not Rated  
Holdings [Line Items]  
Percent of Total Investments 4.00%
C000013129 | BB  
Holdings [Line Items]  
Percent of Total Investments 0.60%
C000013129 | BBB  
Holdings [Line Items]  
Percent of Total Investments 9.50%
C000013129 | A  
Holdings [Line Items]  
Percent of Total Investments 21.50%
C000013129 | AA  
Holdings [Line Items]  
Percent of Total Investments 59.50%
C000013129 | AAA  
Holdings [Line Items]  
Percent of Total Investments 4.90%
C000013129 | Industry Other Line  
Holdings [Line Items]  
Percent of Total Investments 9.30%
C000013129 | Transportation  
Holdings [Line Items]  
Percent of Total Investments 19.80%
C000013129 | Industrial Development Revenue  
Holdings [Line Items]  
Percent of Total Investments 5.70%
C000013129 | Housing  
Holdings [Line Items]  
Percent of Total Investments 6.00%
C000013129 | Special Tax Revenue  
Holdings [Line Items]  
Percent of Total Investments 6.00%
C000013129 | Hospital  
Holdings [Line Items]  
Percent of Total Investments 10.40%
C000013129 | Education  
Holdings [Line Items]  
Percent of Total Investments 15.70%
C000013129 | General Obligations  
Holdings [Line Items]  
Percent of Total Investments 15.10%
C000013129 | Lease Rev./Cert. of Participation  
Holdings [Line Items]  
Percent of Total Investments 12.00%
C000063948 | Not Rated  
Holdings [Line Items]  
Percent of Total Investments 4.00%
C000063948 | BB  
Holdings [Line Items]  
Percent of Total Investments 0.60%
C000063948 | BBB  
Holdings [Line Items]  
Percent of Total Investments 9.50%
C000063948 | A  
Holdings [Line Items]  
Percent of Total Investments 21.50%
C000063948 | AA  
Holdings [Line Items]  
Percent of Total Investments 59.50%
C000063948 | AAA  
Holdings [Line Items]  
Percent of Total Investments 4.90%
C000063948 | Industry Other Line  
Holdings [Line Items]  
Percent of Total Investments 9.30%
C000063948 | Transportation  
Holdings [Line Items]  
Percent of Total Investments 19.80%
C000063948 | Industrial Development Revenue  
Holdings [Line Items]  
Percent of Total Investments 5.70%
C000063948 | Housing  
Holdings [Line Items]  
Percent of Total Investments 6.00%
C000063948 | Special Tax Revenue  
Holdings [Line Items]  
Percent of Total Investments 6.00%
C000063948 | Hospital  
Holdings [Line Items]  
Percent of Total Investments 10.40%
C000063948 | Education  
Holdings [Line Items]  
Percent of Total Investments 15.70%
C000063948 | General Obligations  
Holdings [Line Items]  
Percent of Total Investments 15.10%
C000063948 | Lease Rev./Cert. of Participation  
Holdings [Line Items]  
Percent of Total Investments 12.00%
C000013145 | Not Rated  
Holdings [Line Items]  
Percent of Total Investments 5.80%
C000013145 | BB  
Holdings [Line Items]  
Percent of Total Investments 0.90%
C000013145 | BBB  
Holdings [Line Items]  
Percent of Total Investments 12.00%
C000013145 | A  
Holdings [Line Items]  
Percent of Total Investments 22.90%
C000013145 | AA  
Holdings [Line Items]  
Percent of Total Investments 54.90%
C000013145 | AAA  
Holdings [Line Items]  
Percent of Total Investments 3.10%
C000013145 | B  
Holdings [Line Items]  
Percent of Total Investments 0.40%
C000013145 | Industry Other Line  
Holdings [Line Items]  
Percent of Total Investments 2.00%
C000013145 | Electric Utilities  
Holdings [Line Items]  
Percent of Total Investments 3.50%
C000013145 | Transportation  
Holdings [Line Items]  
Percent of Total Investments 14.10%
C000013145 | Housing  
Holdings [Line Items]  
Percent of Total Investments 4.70%
C000013145 | Water and Sewer  
Holdings [Line Items]  
Percent of Total Investments 8.80%
C000013145 | Special Tax Revenue  
Holdings [Line Items]  
Percent of Total Investments 3.90%
C000013145 | Hospital  
Holdings [Line Items]  
Percent of Total Investments 10.40%
C000013145 | Education  
Holdings [Line Items]  
Percent of Total Investments 13.00%
C000013145 | General Obligations  
Holdings [Line Items]  
Percent of Total Investments 21.90%
C000013145 | Senior Living/Life Care  
Holdings [Line Items]  
Percent of Total Investments 8.70%
C000013145 | Lease Rev./Cert. of Participation  
Holdings [Line Items]  
Percent of Total Investments 5.10%
C000013145 | Bond Bank  
Holdings [Line Items]  
Percent of Total Investments 3.90%
C000013147 | Not Rated  
Holdings [Line Items]  
Percent of Total Investments 5.80%
C000013147 | BB  
Holdings [Line Items]  
Percent of Total Investments 0.90%
C000013147 | BBB  
Holdings [Line Items]  
Percent of Total Investments 12.00%
C000013147 | A  
Holdings [Line Items]  
Percent of Total Investments 22.90%
C000013147 | AA  
Holdings [Line Items]  
Percent of Total Investments 54.90%
C000013147 | AAA  
Holdings [Line Items]  
Percent of Total Investments 3.10%
C000013147 | B  
Holdings [Line Items]  
Percent of Total Investments 0.40%
C000013147 | Industry Other Line  
Holdings [Line Items]  
Percent of Total Investments 2.00%
C000013147 | Electric Utilities  
Holdings [Line Items]  
Percent of Total Investments 3.50%
C000013147 | Transportation  
Holdings [Line Items]  
Percent of Total Investments 14.10%
C000013147 | Housing  
Holdings [Line Items]  
Percent of Total Investments 4.70%
C000013147 | Water and Sewer  
Holdings [Line Items]  
Percent of Total Investments 8.80%
C000013147 | Special Tax Revenue  
Holdings [Line Items]  
Percent of Total Investments 3.90%
C000013147 | Hospital  
Holdings [Line Items]  
Percent of Total Investments 10.40%
C000013147 | Education  
Holdings [Line Items]  
Percent of Total Investments 13.00%
C000013147 | General Obligations  
Holdings [Line Items]  
Percent of Total Investments 21.90%
C000013147 | Senior Living/Life Care  
Holdings [Line Items]  
Percent of Total Investments 8.70%
C000013147 | Lease Rev./Cert. of Participation  
Holdings [Line Items]  
Percent of Total Investments 5.10%
C000013147 | Bond Bank  
Holdings [Line Items]  
Percent of Total Investments 3.90%
C000063951 | Not Rated  
Holdings [Line Items]  
Percent of Total Investments 5.80%
C000063951 | BB  
Holdings [Line Items]  
Percent of Total Investments 0.90%
C000063951 | BBB  
Holdings [Line Items]  
Percent of Total Investments 12.00%
C000063951 | A  
Holdings [Line Items]  
Percent of Total Investments 22.90%
C000063951 | AA  
Holdings [Line Items]  
Percent of Total Investments 54.90%
C000063951 | AAA  
Holdings [Line Items]  
Percent of Total Investments 3.10%
C000063951 | B  
Holdings [Line Items]  
Percent of Total Investments 0.40%
C000063951 | Industry Other Line  
Holdings [Line Items]  
Percent of Total Investments 2.00%
C000063951 | Electric Utilities  
Holdings [Line Items]  
Percent of Total Investments 3.50%
C000063951 | Transportation  
Holdings [Line Items]  
Percent of Total Investments 14.10%
C000063951 | Housing  
Holdings [Line Items]  
Percent of Total Investments 4.70%
C000063951 | Water and Sewer  
Holdings [Line Items]  
Percent of Total Investments 8.80%
C000063951 | Special Tax Revenue  
Holdings [Line Items]  
Percent of Total Investments 3.90%
C000063951 | Hospital  
Holdings [Line Items]  
Percent of Total Investments 10.40%
C000063951 | Education  
Holdings [Line Items]  
Percent of Total Investments 13.00%
C000063951 | General Obligations  
Holdings [Line Items]  
Percent of Total Investments 21.90%
C000063951 | Senior Living/Life Care  
Holdings [Line Items]  
Percent of Total Investments 8.70%
C000063951 | Lease Rev./Cert. of Participation  
Holdings [Line Items]  
Percent of Total Investments 5.10%
C000063951 | Bond Bank  
Holdings [Line Items]  
Percent of Total Investments 3.90%