Class K [Member] Investment Objectives and Goals - Class K [Member] - BlackRock Strategic Municipal Opportunities Fund of BlackRock Municipal Series Trust |
May 31, 2026 |
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| Prospectus [Line Items] | |
| Risk/Return [Heading] | Fund OverviewKey Facts About BlackRock Strategic Municipal Opportunities Fund |
| Objective [Heading] | Investment Objective |
| Objective, Primary [Text Block] | The investment objective of the BlackRock Strategic Municipal Opportunities Fund (the “Fund”) is to provide shareholders with a high level of income exempt from Federal income taxes.
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