S000000285 [Member] Expense Example, No Redemption - Nuveen Intermediate Duration Municipal Bond Fund |
Mar. 31, 2026
USD ($)
|
|---|---|
| Class A | |
| Prospectus [Line Items] | |
| Expense Example, No Redemption, 1 Year | $ 362 |
| Expense Example, No Redemption, 3 Years | 496 |
| Expense Example, No Redemption, 5 Years | 641 |
| Expense Example, No Redemption, 10 Years | 1,063 |
| Class I | |
| Prospectus [Line Items] | |
| Expense Example, No Redemption, 1 Year | 44 |
| Expense Example, No Redemption, 3 Years | 138 |
| Expense Example, No Redemption, 5 Years | 241 |
| Expense Example, No Redemption, 10 Years | 542 |
| Class C | |
| Prospectus [Line Items] | |
| Expense Example, No Redemption, 1 Year | 146 |
| Expense Example, No Redemption, 3 Years | 452 |
| Expense Example, No Redemption, 5 Years | 782 |
| Expense Example, No Redemption, 10 Years | $ 1,713 |