Investor A C Institutional and Class R [Member] Investment Objectives and Goals - Investor A, C, Institutional and Class R - BlackRock International Fund |
May 31, 2025 |
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| Prospectus [Line Items] | |
| Risk/Return [Heading] | Fund Overview Key Facts About BlackRock International Fund |
| Objective [Heading] | Investment Objective |
| Objective, Primary [Text Block] | The investment objective of BlackRock International Fund (the “Fund”), a series of BlackRock Series, Inc. (the “Corporation”), is to seek long-term capital growth through investments primarily in a diversified portfolio of equity securities of companies located outside the United States.
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