v3.25.2
Investor A C Institutional and Class R [Member] Expense Example - Investor A, C, Institutional and Class R - BlackRock Advantage SMID Cap Fund, Inc.
Mar. 31, 2025
USD ($)
Investor A Shares  
Prospectus [Line Items]  
Expense Example, with Redemption, 1 Year $ 596
Expense Example, with Redemption, 3 Years 778
Expense Example, with Redemption, 5 Years 1,007
Expense Example, with Redemption, 10 Years 1,665
Investor C Shares  
Prospectus [Line Items]  
Expense Example, with Redemption, 1 Year 251
Expense Example, with Redemption, 3 Years 512
Expense Example, with Redemption, 5 Years 943
Expense Example, with Redemption, 10 Years 1,917
Institutional Shares  
Prospectus [Line Items]  
Expense Example, with Redemption, 1 Year 49
Expense Example, with Redemption, 3 Years 186
Expense Example, with Redemption, 5 Years 369
Expense Example, with Redemption, 10 Years 898
Class R Shares  
Prospectus [Line Items]  
Expense Example, with Redemption, 1 Year 100
Expense Example, with Redemption, 3 Years 357
Expense Example, with Redemption, 5 Years 680
Expense Example, with Redemption, 10 Years $ 1,595