S000000586 [Member] Average Annual Total Returns |
12 Months Ended | 60 Months Ended | 119 Months Ended | 120 Months Ended | 199 Months Ended | 260 Months Ended | ||
|---|---|---|---|---|---|---|---|---|
Dec. 31, 2025 |
Dec. 31, 2025 |
Dec. 31, 2025 |
Dec. 31, 2025 |
Dec. 31, 2025 |
Dec. 31, 2025 |
|||
| Russell 1000® Growth Index (reflects no deduction for fees, expenses or taxes) | ||||||||
| Prospectus [Line Items] | ||||||||
| Average Annual Return, Percent | 18.56% | 15.32% | 12.76% | 18.13% | ||||
| S&P 500 Index (reflects no deduction for fees, expenses or taxes) | ||||||||
| Prospectus [Line Items] | ||||||||
| Average Annual Return, Percent | 17.88% | 14.42% | 10.88% | 14.82% | ||||
| BARON FIFTH AVENUE GROWTH FUND | ||||||||
| Prospectus [Line Items] | ||||||||
| Average Annual Return, Percent | 18.00% | 6.90% | 14.63% | 10.56% | ||||
| Performance Inception Date | Apr. 30, 2004 | |||||||
| BARON FIFTH AVENUE GROWTH FUND | After Taxes on Distributions | ||||||||
| Prospectus [Line Items] | ||||||||
| Average Annual Return, Percent | 16.89% | 6.50% | 14.33% | 10.28% | ||||
| Performance Inception Date | Apr. 30, 2004 | |||||||
| BARON FIFTH AVENUE GROWTH FUND | After Taxes on Distributions and Sales | ||||||||
| Prospectus [Line Items] | ||||||||
| Average Annual Return, Percent | 11.44% | 5.39% | 12.36% | 9.22% | ||||
| Performance Inception Date | Apr. 30, 2004 | |||||||
| Institutional Shares | ||||||||
| Prospectus [Line Items] | ||||||||
| Average Annual Return, Percent | [1] | 18.15% | 7.15% | 14.91% | 10.77% | |||
| Performance Inception Date | [1] | May 29, 2009 | ||||||
| R6 Shares | ||||||||
| Prospectus [Line Items] | ||||||||
| Average Annual Return, Percent | [1] | 18.30% | 7.16% | 10.77% | 14.92% | |||
| Performance Inception Date | [1] | Jan. 29, 2016 | ||||||
| ||||||||