v3.25.4
S000001599 [Member] Expense Example - Tax-Exempt Bond Fund
Oct. 31, 2025
USD ($)
Class M  
Prospectus [Line Items]  
Expense Example, with Redemption, 1 Year $ 42
Expense Example, with Redemption, 3 Years 167
Expense Example, with Redemption, 5 Years 302
Expense Example, with Redemption, 10 Years 698
Class S  
Prospectus [Line Items]  
Expense Example, with Redemption, 1 Year 52
Expense Example, with Redemption, 3 Years 177
Expense Example, with Redemption, 5 Years 312
Expense Example, with Redemption, 10 Years 708
Class C  
Prospectus [Line Items]  
Expense Example, with Redemption, 1 Year 154
Expense Example, with Redemption, 3 Years 490
Expense Example, with Redemption, 5 Years 849
Expense Example, with Redemption, 10 Years 1,862
Class A  
Prospectus [Line Items]  
Expense Example, with Redemption, 1 Year 454
Expense Example, with Redemption, 3 Years 625
Expense Example, with Redemption, 5 Years 811
Expense Example, with Redemption, 10 Years $ 1,349