v3.26.1
Shareholder Report, Holdings (Details)
Apr. 30, 2026
C000098257 [Member] | Airport [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 8.40%
C000098257 [Member] | senior Care [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 6.00%
C000098257 [Member] | Other utility [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 5.90%
C000098257 [Member] | Public Power [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 4.40%
C000098257 [Member] | Toll Road [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 3.80%
C000098257 [Member] | Hospital [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 11.40%
C000098257 [Member] | Water And Sewer [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 8.80%
C000098257 [Member] | Real Estate Sector [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 0.10%
C000098257 [Member] | Communications Sector [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 10.10%
C000098257 [Member] | Consumer Discretionary Sector [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 7.00%
C000098257 [Member] | Consumer Staples Sector [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 6.30%
C000098257 [Member] | Industrial Sector [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 10.80%
C000098257 [Member] | Information Technology Sector [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 25.30%
C000098257 [Member] | Materials Sector [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 3.10%
C000098257 [Member] | Utilities Sector [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 6.60%
C000098257 [Member] | Energy Sector [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 5.10%
C000098257 [Member] | Financial Services Sector [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 14.70%
C000098257 [Member] | Healthcare Sector [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 10.90%
C000098257 [Member] | Dedicated Tax [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 11.50%
C000098257 [Member] | General Obligation State [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 8.50%
C000098257 [Member] | General Obligation State Appropriation [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 4.70%
C000098257 [Member] | Tax Exempt Short Term Securities [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 4.40%
C000098257 [Member] | Tax Exempt Fixed Income Securities [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 46.90%
C000098257 [Member] | General Obligation Local [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 10.60%
C000098257 [Member] | Equity [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 48.40%
C000024657 [Member] | Airport [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 8.40%
C000024657 [Member] | senior Care [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 6.00%
C000024657 [Member] | Other utility [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 5.90%
C000024657 [Member] | Public Power [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 4.40%
C000024657 [Member] | Toll Road [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 3.80%
C000024657 [Member] | Hospital [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 11.40%
C000024657 [Member] | Water And Sewer [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 8.80%
C000024657 [Member] | Real Estate Sector [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 0.10%
C000024657 [Member] | Communications Sector [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 10.10%
C000024657 [Member] | Consumer Discretionary Sector [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 7.00%
C000024657 [Member] | Consumer Staples Sector [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 6.30%
C000024657 [Member] | Industrial Sector [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 10.80%
C000024657 [Member] | Information Technology Sector [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 25.30%
C000024657 [Member] | Materials Sector [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 3.10%
C000024657 [Member] | Utilities Sector [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 6.60%
C000024657 [Member] | Energy Sector [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 5.10%
C000024657 [Member] | Financial Services Sector [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 14.70%
C000024657 [Member] | Healthcare Sector [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 10.90%
C000024657 [Member] | Dedicated Tax [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 11.50%
C000024657 [Member] | General Obligation State [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 8.50%
C000024657 [Member] | General Obligation State Appropriation [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 4.70%
C000024657 [Member] | Tax Exempt Short Term Securities [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 4.40%
C000024657 [Member] | Tax Exempt Fixed Income Securities [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 46.90%
C000024657 [Member] | General Obligation Local [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 10.60%
C000024657 [Member] | Equity [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 48.40%
C000024659 [Member] | Airport [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 8.40%
C000024659 [Member] | senior Care [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 6.00%
C000024659 [Member] | Other utility [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 5.90%
C000024659 [Member] | Public Power [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 4.40%
C000024659 [Member] | Toll Road [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 3.80%
C000024659 [Member] | Hospital [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 11.40%
C000024659 [Member] | Water And Sewer [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 8.80%
C000024659 [Member] | Real Estate Sector [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 0.10%
C000024659 [Member] | Communications Sector [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 10.10%
C000024659 [Member] | Consumer Discretionary Sector [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 7.00%
C000024659 [Member] | Consumer Staples Sector [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 6.30%
C000024659 [Member] | Industrial Sector [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 10.80%
C000024659 [Member] | Information Technology Sector [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 25.30%
C000024659 [Member] | Materials Sector [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 3.10%
C000024659 [Member] | Utilities Sector [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 6.60%
C000024659 [Member] | Energy Sector [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 5.10%
C000024659 [Member] | Financial Services Sector [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 14.70%
C000024659 [Member] | Healthcare Sector [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 10.90%
C000024659 [Member] | Dedicated Tax [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 11.50%
C000024659 [Member] | General Obligation State [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 8.50%
C000024659 [Member] | General Obligation State Appropriation [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 4.70%
C000024659 [Member] | Tax Exempt Short Term Securities [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 4.40%
C000024659 [Member] | Tax Exempt Fixed Income Securities [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 46.90%
C000024659 [Member] | General Obligation Local [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 10.60%
C000024659 [Member] | Equity [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 48.40%
C000051328 [Member] | Airport [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 8.40%
C000051328 [Member] | senior Care [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 6.00%
C000051328 [Member] | Other utility [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 5.90%
C000051328 [Member] | Public Power [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 4.40%
C000051328 [Member] | Toll Road [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 3.80%
C000051328 [Member] | Hospital [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 11.40%
C000051328 [Member] | Water And Sewer [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 8.80%
C000051328 [Member] | Real Estate Sector [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 0.10%
C000051328 [Member] | Communications Sector [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 10.10%
C000051328 [Member] | Consumer Discretionary Sector [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 7.00%
C000051328 [Member] | Consumer Staples Sector [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 6.30%
C000051328 [Member] | Industrial Sector [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 10.80%
C000051328 [Member] | Information Technology Sector [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 25.30%
C000051328 [Member] | Materials Sector [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 3.10%
C000051328 [Member] | Utilities Sector [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 6.60%
C000051328 [Member] | Energy Sector [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 5.10%
C000051328 [Member] | Financial Services Sector [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 14.70%
C000051328 [Member] | Healthcare Sector [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 10.90%
C000051328 [Member] | Dedicated Tax [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 11.50%
C000051328 [Member] | General Obligation State [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 8.50%
C000051328 [Member] | General Obligation State Appropriation [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 4.70%
C000051328 [Member] | Tax Exempt Short Term Securities [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 4.40%
C000051328 [Member] | Tax Exempt Fixed Income Securities [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 46.90%
C000051328 [Member] | General Obligation Local [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 10.60%
C000051328 [Member] | Equity [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 48.40%