S000042178 [Member] Performance Management - BARON DISCOVERY FUND |
Sep. 30, 2025 |
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| Prospectus [Line Items] | |||||
| Bar Chart and Performance Table [Heading] | Performance | ||||
| Performance Narrative [Text Block] | 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, and 10 years and since inception compare with a style-specific index (one reflecting the market segments in which the Fund invests), and a broad-based index. 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, and 10 years and since inception compare with a style-specific index (one reflecting the market segments in which the Fund invests), and a broad-based index. | ||||
| Performance Additional Market Index [Text] | This table shows how the Fund’s performance compares to that of the Russell 2000® Growth Index, which measures the performance of the small-cap growth segment of the U.S. equity universe, in which the Fund invests, and the Russell 3000 Index, a broad-based securities index which is comprised of the 3,000 largest U.S. companies as determined by total market capitalization. | ||||
| 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 12/31/25) | ||||
| Performance Table Narrative | The following table shows the Fund’s Retail Shares’ annual returns and long-term performance (before and after taxes) 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 2000® Growth Index, which measures the performance of the small-cap growth segment of the U.S. equity universe, in which the Fund invests, and the Russell 3000 Index, a broad-based securities index which is 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. 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’s 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’s shares in a tax-deferred account (including a 401(k) or IRA or Coverdell account), or to investors that are tax-exempt. | ||||
| Performance Availability Website Address [Text] | BaronCapitalGroup.com/daily-prices-and-performance | ||||
| Performance Availability Phone [Text] | 1‑800‑99BARON (1‑800‑992‑2766) | ||||
| BARON DISCOVERY FUND | |||||
| Prospectus [Line Items] | |||||
| Highest Quarterly Return, Label [Optional Text] | Best Quarter: | ||||
| Highest Quarterly Return | 39.02% | ||||
| Highest Quarterly Return, Date | Jun. 30, 2020 | ||||
| Lowest Quarterly Return, Label [Optional Text] | Worst Quarter: | ||||
| Lowest Quarterly Return | (23.39%) | ||||
| Lowest Quarterly Return, Date | Dec. 31, 2018 |