v3.26.3
Investor A C Institutional and Class R [Member] Expense Example - Investor A, C, Institutional and Class R - BLACKROCK CAPITAL APPRECIATION FUND, INC.
May 31, 2026
USD ($)
Investor A Shares  
Prospectus [Line Items]  
Expense Example, with Redemption, 1 Year $ 614
Expense Example, with Redemption, 3 Years 815
Expense Example, with Redemption, 5 Years 1,033
Expense Example, with Redemption, 10 Years 1,658
Investor C Shares  
Prospectus [Line Items]  
Expense Example, with Redemption, 1 Year 270
Expense Example, with Redemption, 3 Years 558
Expense Example, with Redemption, 5 Years 971
Expense Example, with Redemption, 10 Years 1,904
Institutional Shares  
Prospectus [Line Items]  
Expense Example, with Redemption, 1 Year 68
Expense Example, with Redemption, 3 Years 227
Expense Example, with Redemption, 5 Years 400
Expense Example, with Redemption, 10 Years 901
Class R Shares  
Prospectus [Line Items]  
Expense Example, with Redemption, 1 Year 119
Expense Example, with Redemption, 3 Years 406
Expense Example, with Redemption, 5 Years 713
Expense Example, with Redemption, 10 Years $ 1,588