S000000588 [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 Partners Fund | Retail Shares | ||||||||||
| Prospectus [Line Items] | ||||||||||
| Annual Return [Percent] | 24.55% | 32.74% | 43.10% | (42.56%) | 31.39% | 148.56% | 44.97% | (2.01%) | 31.54% | 4.04% |