v3.26.3
Investor A C and Institutional [Member] Shareholder Fees - Investor A C and Institutional - BlackRock Strategic Municipal Opportunities Fund of BlackRock Municipal Series Trust
May 31, 2026
Institutional Shares  
Prospectus [Line Items]  
Maximum Sales Charge Imposed on Purchases (as a percentage of Offering Price) 0.00%
Maximum Deferred Sales Charge (as a percentage of Offering Price) 0.00%
Investor A Shares  
Prospectus [Line Items]  
Maximum Sales Charge Imposed on Purchases (as a percentage of Offering Price) 4.25%
Maximum Deferred Sales Charge (as a percentage of Offering Price) 0.00% [1]
Investor C Shares  
Prospectus [Line Items]  
Maximum Sales Charge Imposed on Purchases (as a percentage of Offering Price) 0.00%
Maximum Deferred Sales Charge (as a percentage of Offering Price) 1.00% [2]
[1] A contingent deferred sales charge (“CDSC”) of 1.00% is assessed on certain redemptions of Investor A Shares made within 18 months after purchase where no initial sales charge was paid at the time of purchase as part of an investment of $250,000 or more.
[2] There is no CDSC on Investor C Shares after one year.