S000000582 [Member] Annual Total Returns - BARON ASSET FUND |
12 Months Ended | ||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|
Sep. 30, 2025 |
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 |
|
| Prospectus [Line Items] | |||||||||||
| Annual Return Caption [Text] | Average Annual Total Returns for the periods ended December 31, 2025 | ||||||||||
| BARON ASSET FUND | |||||||||||
| Prospectus [Line Items] | |||||||||||
| Annual Return [Percent] | 7.94% | 10.48% | 17.04% | (26.06%) | 13.93% | 32.98% | 37.62% | (0.14%) | 26.13% | 6.23% | |