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Investor A C Institutional Class R [Member] Investment Objectives and Goals - Investor A, C, Institutional and Class R - BLACKROCK CAPITAL APPRECIATION FUND, INC.
May 31, 2025
Prospectus [Line Items]  
Risk/Return [Heading] Fund OverviewKey Facts About BlackRock Capital Appreciation Fund, Inc.
Objective [Heading] Investment Objective
Objective, Primary [Text Block]
The investment objective of BlackRock Capital Appreciation Fund, Inc. (the “Fund”) is to seek long-term growth of capital.