S000022521 [Member] Performance Management - Baron Focused Growth Fund |
Dec. 31, 2025 |
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| Prospectus [Line Items] | |||||
| Bar Chart and Performance Table [Heading] | Performance | ||||
| Performance Narrative [Text Block] | Although Baron Focused Growth Fund was registered as a mutual fund on June 30, 2008, it has been managed in the same style and by the same portfolio manager since the predecessor partnership’s inception on May 31, 1996. The Fund was added as a series of Baron Select Funds, a Delaware statutory trust, on June 30, 2008. The Fund’s investment goals, policies, guidelines and restrictions are, in all material respects, equivalent to the predecessor partnership’s. The following information shows the Fund’s annual returns and long-term performance reflecting the actual fees and expenses that were charged when the Fund was a partnership and since it converted to a mutual fund. The predecessor partnership charged a 15% performance fee after it reached a certain performance benchmark. If the annual returns for the Fund did not reflect the performance fee for the years the partnership charged a performance fee, the returns would have been higher. The Fund does not charge a performance fee. From its inception on May 31, 1996 through June 30, 2008, the predecessor partnership was not subject to certain investment restrictions, diversification requirements and other restrictions of the Investment Company Act of 1940, as amended (the “1940 Act”), or the Internal Revenue Code of 1986, as amended (the “Code”), which if they had been applicable, might have adversely affected its performance. The following bar chart and table provide some indication of the risks of investing in the Fund (Retail Shares) by showing changes in the Fund’s performance from year to year and by showing how the Fund’s average annual returns for 1, 5, 10 years, and since inception compare with those of a style-specific index (one reflecting the market segments in which the Fund invests), and a broad-based index, in that order. The Fund’s past performance (before and after taxes) is not necessarily an indication of how the Fund will perform in the future. Updated performance information is available online at BaronCapitalGroup.com/daily‑prices‑and‑performance or by calling 1‑800‑99BARON (1-800-992-2766).
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| Performance Past Does Not Indicate Future [Text] | The Fund’s past performance (before and after taxes) is not necessarily an indication of how the Fund will perform in the future. | ||||
| Performance Information Illustrates Variability of Returns [Text] | The following bar chart and table provide some indication of the risks of investing in the Fund (Retail Shares) by showing changes in the Fund’s performance from year to year and by showing how the Fund’s average annual returns for 1, 5, 10 years, and since inception compare with those of a style-specific index (one reflecting the market segments in which the Fund invests), and a broad-based index, inthat order. | ||||
| Bar Chart [Heading] | Year by Year Total Return (%) as of December 31 of Each Year (Retail Shares) | ||||
| Bar Chart Closing [Text Block] |
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| Performance Table Heading | Average Annual Total Returns (for periods ended 12/31/2025) | ||||
| Performance Table Narrative | The following table shows the Fund’s Retail Shares’ annual returns and long-term performance (before and after taxes), which includes its predecessor partnership’s average annual returns, and the change in value of market indexes over various periods ended December 31, 2025. This table shows how the Fund’s performance compares to that of the Russell 2500® Growth Index, which measures the performance of the small to mid-cap growth segment of the U.S. equity universe, in which the Fund invests, and the Russell 3000® Index, a broad-based securities index comprised of the 3,000 largest U.S. companies as determined by total market capitalization. The table also shows the average annual returns of the Fund’s Institutional Shares and R6 Shares, but it does not show after-tax returns. After-tax returns are calculated using the highest individual federal marginal income tax rate in effect at the time of each distribution and assumed sale, but they do not include the impact of state and local taxes. Because the predecessor partnership did not have a distribution policy prior to July 1, 2008, the Fund is unable to show after-tax returns prior to that date. Your actual after-tax returns depend on your own tax situation and may differ from those shown. After-tax returns reflect past tax effects and are not predictive of future tax effects. After-tax returns are not relevant to investors who hold their Fund shares in a tax-deferred account (including a
401(k) or IRA or Coverdell account), or to investors that are tax-exempt. |
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| Performance Table Uses Highest Federal Rate | After-tax returns are calculated using the highest individual federal marginal income tax rate in effect at the time of each distribution and assumed sale, but they do not include the impact of state and local taxes. | ||||
| Performance Table Not Relevant to Tax Deferred | After-tax returns are not relevant to investors who hold their Fund shares in a tax-deferred account (including a 401(k) or IRA or Coverdell account), or to investors that are tax-exempt. | ||||
| Average Annual Return, Caption [Optional Text] | Average Annual Total Returns for the periods ended December 31, 2025 | ||||
| Performance Table One Class of after Tax Shown [Text] | The table also shows the average annual returns of the Fund’s Institutional Shares and R6 Shares, but it does not show after-tax returns. | ||||
| Performance Availability Website Address [Text] | BaronCapitalGroup.com/daily‑prices‑and‑performance | ||||
| Performance Availability Phone [Text] | 1‑800‑99BARON (1-800-992-2766) | ||||
| Retail Shares | |||||
| Prospectus [Line Items] | |||||
| Highest Quarterly Return, Label [Optional Text] | Best Quarter: | ||||
| Highest Quarterly Return | 43.62% | ||||
| Highest Quarterly Return, Date | Sep. 30, 2020 | ||||
| Lowest Quarterly Return, Label [Optional Text] | Worst Quarter: | ||||
| Lowest Quarterly Return | (19.97%) | ||||
| Lowest Quarterly Return, Date | Jun. 30, 2022 |