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S000000582 [Member] Investment Strategy - BARON ASSET FUND
Sep. 30, 2025
Prospectus [Line Items]  
Strategy [Heading] Investments, Risks, and Performance Principal Investment Strategies of the Fund
Strategy Narrative [Text Block]
The Fund is a diversified fund that, under normal circumstances, invests primarily in equity securities of U.S. mid-sized growth companies. BAMCO, Inc. (“BAMCO” or the “Adviser”) defines mid-sized companies as those, at the time of purchase, with market capitalizations above $2.5 billion or the smallest market cap stock in the Russell Midcap Growth Index at reconstitution, whichever is larger, and below the largest market cap stock in the Russell Midcap Growth Index at reconstitution. The Adviser seeks to invest in businesses it believes have significant opportunities for growth, sustainable competitive advantages, exceptional management, and an attractive valuation. Because of its long-term approach, the Fund could have a significant percentage of its assets invested in securities that have appreciated beyond their market capitalizations at the time of the Fund’s investment.