Investor A C and Institutional [Member] Expense Example, No Redemption - Investor A, C and Institutional - BlackRock Strategic Municipal Opportunities Fund - Investor C Shares |
May 31, 2025
USD ($)
|
|---|---|
| Prospectus [Line Items] | |
| Expense Example, No Redemption, 1 Year | $ 176 |
| Expense Example, No Redemption, 3 Years | 557 |
| Expense Example, No Redemption, 5 Years | 964 |
| Expense Example, No Redemption, 10 Years | $ 1,895 |