S000000583 [Member] Average Annual Total Returns |
12 Months Ended | 60 Months Ended | 119 Months Ended | 120 Months Ended | 199 Months Ended | 372 Months Ended | ||
|---|---|---|---|---|---|---|---|---|
Dec. 31, 2025 |
Dec. 31, 2025 |
Dec. 31, 2025 |
Dec. 31, 2025 |
Dec. 31, 2025 |
Dec. 31, 2025 |
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| Russell 2000® Growth Index (reflects no deduction for fees, expenses or taxes) | ||||||||
| Prospectus [Line Items] | ||||||||
| Average Annual Return, Percent | 13.01% | 3.18% | 8.08% | 9.57% | ||||
| Russell 3000® Index (reflects no deduction for fees, expenses or taxes) | ||||||||
| Prospectus [Line Items] | ||||||||
| Average Annual Return, Percent | 17.15% | 13.15% | 11.01% | 14.29% | ||||
| BARON GROWTH FUND | ||||||||
| Prospectus [Line Items] | ||||||||
| Average Annual Return, Percent | (14.41%) | (0.94%) | 8.78% | 11.47% | ||||
| Performance Inception Date | Dec. 31, 1994 | |||||||
| BARON GROWTH FUND | After Taxes on Distributions | ||||||||
| Prospectus [Line Items] | ||||||||
| Average Annual Return, Percent | (17.93%) | (2.95%) | 6.72% | 10.31% | ||||
| Performance Inception Date | Dec. 31, 1994 | |||||||
| BARON GROWTH FUND | After Taxes on Distributions and Sales | ||||||||
| Prospectus [Line Items] | ||||||||
| Average Annual Return, Percent | (6.02%) | (0.58%) | 6.98% | 10.14% | ||||
| Performance Inception Date | Dec. 31, 1994 | |||||||
| Institutional Shares | ||||||||
| Prospectus [Line Items] | ||||||||
| Average Annual Return, Percent | [1] | (14.18%) | (0.69%) | 9.06% | 11.62% | |||
| Performance Inception Date | [1] | May 29, 2009 | ||||||
| R6 Shares | ||||||||
| Prospectus [Line Items] | ||||||||
| Average Annual Return, Percent | [1] | (14.18%) | (0.69%) | 11.62% | 9.06% | |||
| Performance Inception Date | [1] | Jan. 29, 2016 | ||||||
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