Investor A C and Institutional [Member] Expense Example, No Redemption - Investor A C and Institutional - BlackRock Strategic Municipal Opportunities Fund of BlackRock Municipal Series Trust - Investor C Shares |
May 31, 2026
USD ($)
|
|---|---|
| Prospectus [Line Items] | |
| Expense Example, No Redemption, 1 Year | $ 194 |
| Expense Example, No Redemption, 3 Years | 610 |
| Expense Example, No Redemption, 5 Years | 1,053 |
| Expense Example, No Redemption, 10 Years | $ 2,079 |