Investor A C and Institutional [Member] Expense Example - Investor A, C and Institutional - BlackRock Strategic Municipal Opportunities Fund |
May 31, 2025
USD ($)
|
|---|---|
| Investor A Shares | |
| Prospectus [Line Items] | |
| Expense Example, with Redemption, 1 Year | $ 519 |
| Expense Example, with Redemption, 3 Years | 728 |
| Expense Example, with Redemption, 5 Years | 954 |
| Expense Example, with Redemption, 10 Years | 1,604 |
| Investor C Shares | |
| Prospectus [Line Items] | |
| Expense Example, with Redemption, 1 Year | 276 |
| Expense Example, with Redemption, 3 Years | 557 |
| Expense Example, with Redemption, 5 Years | 964 |
| Expense Example, with Redemption, 10 Years | 1,895 |
| Institutional Shares | |
| Prospectus [Line Items] | |
| Expense Example, with Redemption, 1 Year | 78 |
| Expense Example, with Redemption, 3 Years | 254 |
| Expense Example, with Redemption, 5 Years | 445 |
| Expense Example, with Redemption, 10 Years | $ 997 |