Investor A C and Institutional [Member] Expense Example - Investor A C and Institutional - BlackRock Strategic Municipal Opportunities Fund of BlackRock Municipal Series Trust |
May 31, 2026
USD ($)
|
|---|---|
| Institutional Shares | |
| Prospectus [Line Items] | |
| Expense Example, with Redemption, 1 Year | $ 94 |
| Expense Example, with Redemption, 3 Years | 304 |
| Expense Example, with Redemption, 5 Years | 531 |
| Expense Example, with Redemption, 10 Years | 1,185 |
| Investor A Shares | |
| Prospectus [Line Items] | |
| Expense Example, with Redemption, 1 Year | 534 |
| Expense Example, with Redemption, 3 Years | 778 |
| Expense Example, with Redemption, 5 Years | 1,041 |
| Expense Example, with Redemption, 10 Years | 1,791 |
| Investor C Shares | |
| Prospectus [Line Items] | |
| Expense Example, with Redemption, 1 Year | 294 |
| Expense Example, with Redemption, 3 Years | 610 |
| Expense Example, with Redemption, 5 Years | 1,053 |
| Expense Example, with Redemption, 10 Years | $ 2,079 |