S000000588 [Member] Investment Strategy - Baron Partners Fund |
Dec. 31, 2025 |
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| Prospectus [Line Items] | |
| Strategy [Heading] | Investments, Risks, and Performance Principal Investment Strategies of the Fund |
| Strategy Narrative [Text Block] | The Fund is a non-diversified fund that, under normal circumstances, invests primarily in equity securities of U.S. growth companies of any market capitalization. BAMCO, Inc. (“BAMCO” or the “Adviser”) seeks to invest in businesses it believes have significant opportunities for growth, sustainable competitive advantages, exceptional management, and an attractive valuation. To take advantage of opportunities to invest, the Fund may borrow money from banks (leverage) in an amount up to one‑third of its total assets, which include assets purchased with borrowed money.
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