Investment Strategy - BlackRock Advantage Small Cap Core Fund	May 31, 2026
Investor A, C and Institutional
Prospectus [Line Items]
Strategy [Heading]	Principal Investment Strategies of the Fund
Strategy Narrative [Text Block]	Under normal circumstances, the Fund seeks to invest at least 80% of its net assets plus any borrowings for investment purposes in equity securities or other financial instruments that are components of, or have market capitalizations similar to, the securities included in the Russell 2000 Index. With respect to such equity investments, investments in derivatives are counted toward the Fund’s 80% policy to the extent that they provide investment exposure to the securities included within that policy or to one or more market risk factors associated with such securities. The companies included in the Russell 2000 Index have market capitalizations that range from approximately $0.37 million to $12.12 billion as of August 31, 2026. The Fund primarily seeks to buy common stock and may also invest in preferred stock and convertible securities. From time to time the Fund may invest in shares of companies through “new issues” or initial public offerings (“IPOs”). The Fund may use derivatives, including options, futures, swaps and forward contracts both to seek to increase the return of the Fund and to hedge (or protect) the value of its assets against adverse movements in currency exchange rates, interest rates and movements in the securities markets. In order to manage cash flows into or out of the Fund effectively, the Fund may buy and sell financial futures contracts or options on such contracts. Derivatives are financial instruments whose value is derived from another security, a commodity (such as oil or gas), a currency or an index, including but not limited to the Russell 2000 Index. The use of options, futures, swaps and forward contracts can be effective in protecting or enhancing the value of the Fund’s assets. The Fund seeks to pursue its investment objective by investing in small cap securities in a disciplined manner, by using proprietary return forecast models that incorporate quantitative analysis. These forecast models are designed to identify aspects of mispricing across stocks which the Fund can seek to capture by over- and under-weighting particular equities while seeking to control incremental risk. The Fund’s manager then constructs and rebalances the portfolio by integrating its investment insights with the model-based optimization process.
Summary of Definition of Rule 35d-1 Term in Fund Name [Text Block]	The companies included in the Russell 2000 Index have market capitalizations that range from approximately $0.37 million to $12.12 billion as of August 31, 2026. The Fund primarily seeks to buy common stock and may also invest in preferred stock and convertible securities. From time to time the Fund may invest in shares of companies through “new issues” or initial public offerings (“IPOs”).
Summary of Selection Criteria for Rule 35d-1 Term in Fund Name [Text Block]	The Fund seeks to pursue its investment objective by investing in small cap securities in a disciplined manner, by using proprietary return forecast models that incorporate quantitative analysis. These forecast models are designed to identify aspects of mispricing across stocks which the Fund can seek to capture by over- and under-weighting particular equities while seeking to control incremental risk. The Fund’s manager then constructs and rebalances the portfolio by integrating its investment insights with the model-based optimization process.
Rule 35d-1 Eighty Percent Investment Policy [Text Block]	Under normal circumstances, the Fund seeks to invest at least 80% of its net assets plus any borrowings for investment purposes in equity securities or other financial instruments that are components of, or have market capitalizations similar to, the securities included in the Russell 2000 Index. With respect to such equity investments, investments in derivatives are counted toward the Fund’s 80% policy to the extent that they provide investment exposure to the securities included within that policy or to one or more market risk factors associated with such securities.
Class K
Prospectus [Line Items]
Strategy [Heading]	Principal Investment Strategies of the Fund
Strategy Narrative [Text Block]	Under normal circumstances, the Fund seeks to invest at least 80% of its net assets plus any borrowings for investment purposes in equity securities or other financial instruments that are components of, or have market capitalizations similar to, the securities included in the Russell 2000 Index. With respect to such equity investments, investments in derivatives are counted toward the Fund’s 80% policy to the extent that they provide investment exposure to the securities included within that policy or to one or more market risk factors associated with such securities. The companies included in the Russell 2000 Index have market capitalizations that range from approximately $0.37 million to $12.12 billion as of August 31, 2026. The Fund primarily seeks to buy common stock and may also invest in preferred stock and convertible securities. From time to time the Fund may invest in shares of companies through “new issues” or initial public offerings (“IPOs”). The Fund may use derivatives, including options, futures, swaps and forward contracts both to seek to increase the return of the Fund and to hedge (or protect) the value of its assets against adverse movements in currency exchange rates, interest rates and movements in the securities markets. In order to manage cash flows into or out of the Fund effectively, the Fund may buy and sell financial futures contracts or options on such contracts. Derivatives are financial instruments whose value is derived from another security, a commodity (such as oil or gas), a currency or an index, including but not limited to the Russell 2000 Index. The use of options, futures, swaps and forward contracts can be effective in protecting or enhancing the value of the Fund’s assets. The Fund seeks to pursue its investment objective by investing in small cap securities in a disciplined manner, by using proprietary return forecast models that incorporate quantitative analysis. These forecast models are designed to identify aspects of mispricing across stocks which the Fund can seek to capture by over- and under-weighting particular equities while seeking to control incremental risk. The Fund’s manager then constructs and rebalances the portfolio by integrating its investment insights with the model-based optimization process.
Summary of Definition of Rule 35d-1 Term in Fund Name [Text Block]	The companies included in the Russell 2000 Index have market capitalizations that range from approximately $0.37 million to $12.12 billion as of August 31, 2026. The Fund primarily seeks to buy common stock and may also invest in preferred stock and convertible securities. From time to time the Fund may invest in shares of companies through “new issues” or initial public offerings (“IPOs”).
Summary of Selection Criteria for Rule 35d-1 Term in Fund Name [Text Block]	The Fund seeks to pursue its investment objective by investing in small cap securities in a disciplined manner, by using proprietary return forecast models that incorporate quantitative analysis. These forecast models are designed to identify aspects of mispricing across stocks which the Fund can seek to capture by over- and under-weighting particular equities while seeking to control incremental risk. The Fund’s manager then constructs and rebalances the portfolio by integrating its investment insights with the model-based optimization process.
Rule 35d-1 Eighty Percent Investment Policy [Text Block]	Under normal circumstances, the Fund seeks to invest at least 80% of its net assets plus any borrowings for investment purposes in equity securities or other financial instruments that are components of, or have market capitalizations similar to, the securities included in the Russell 2000 Index. With respect to such equity investments, investments in derivatives are counted toward the Fund’s 80% policy to the extent that they provide investment exposure to the securities included within that policy or to one or more market risk factors associated with such securities.

Under normal circumstances, the Fund seeks to invest at least 80% of its net assets plus any borrowings for investment purposes in equity securities or other financial instruments that are components of, or have market capitalizations similar to, the securities included in the Russell 2000 Index. With respect to such equity investments, investments in derivatives are counted toward the Fund’s 80% policy to the extent that they provide investment exposure to the securities included within that policy or to one or more market risk factors associated with such securities. The companies included in the Russell 2000 Index have market capitalizations that range from approximately $0.37 million to $12.12 billion as of August 31, 2026. The Fund primarily seeks to buy common stock and may also invest in preferred stock and convertible securities. From time to time the Fund may invest in shares of companies through “new issues” or initial public offerings (“IPOs”).

The Fund may use derivatives, including options, futures, swaps and forward contracts both to seek to increase the return of the Fund and to hedge (or protect) the value of its assets against adverse movements in currency exchange rates, interest rates and movements in the securities markets. In order to manage cash flows into or out of the Fund effectively, the Fund may buy and sell financial futures contracts or options on such contracts. Derivatives are financial instruments whose value is derived from another security, a commodity (such as oil or gas), a currency or an index, including but not limited to the Russell 2000 Index. The use of options, futures, swaps and forward contracts can be effective in protecting or enhancing the value of the Fund’s assets.

The Fund seeks to pursue its investment objective by investing in small cap securities in a disciplined manner, by using proprietary return forecast models that incorporate quantitative analysis. These forecast models are designed to identify aspects of mispricing across stocks which the Fund can seek to capture by over- and under-weighting particular equities while seeking to control incremental risk. The Fund’s manager then constructs and rebalances the portfolio by integrating its investment insights with the model-based optimization process.

Summary of Selection Criteria for Rule 35d-1 Term in Fund Name [Text Block]

The Fund seeks to pursue its investment objective by investing in small cap securities in a disciplined manner, by using proprietary return forecast models that incorporate quantitative analysis. These forecast models are designed to identify aspects of mispricing across stocks which the Fund can seek to capture by over- and under-weighting particular equities while seeking to control incremental risk. The Fund’s manager then constructs and rebalances the portfolio by integrating its investment insights with the model-based optimization process.

Strategy [Heading]

Principal Investment Strategies of the Fund

Summary of Definition of Rule 35d-1 Term in Fund Name [Text Block]

The companies included in the Russell 2000 Index have market capitalizations that range from approximately $0.37 million to $12.12 billion as of August 31, 2026. The Fund primarily seeks to buy common stock and may also invest in preferred stock and convertible securities. From time to time the Fund may invest in shares of companies through “new issues” or initial public offerings (“IPOs”).

Rule 35d-1 Eighty Percent Investment Policy [Text Block]

Under normal circumstances, the Fund seeks to invest at least 80% of its net assets plus any borrowings for investment purposes in equity securities or other financial instruments that are components of, or have market capitalizations similar to, the securities included in the Russell 2000 Index. With respect to such equity investments, investments in derivatives are counted toward the Fund’s 80% policy to the extent that they provide investment exposure to the securities included within that policy or to one or more market risk factors associated with such securities.