S000022521 [Member] Annual Total Returns |
12 Months Ended | |||||||||
|---|---|---|---|---|---|---|---|---|---|---|
Dec. 31, 2025 |
Dec. 31, 2024 |
Dec. 31, 2023 |
Dec. 31, 2022 |
Dec. 31, 2021 |
Dec. 31, 2020 |
Dec. 31, 2019 |
Dec. 31, 2018 |
Dec. 31, 2017 |
Dec. 31, 2016 |
|
| Baron Focused Growth Fund | Retail Shares | ||||||||||
| Prospectus [Line Items] | ||||||||||
| Annual Return [Percent] | 21.94% | 29.52% | 27.40% | (28.30%) | 18.83% | 122.21% | 30.03% | 3.75% | 26.36% | 0.67% |