S000060168 [Member] Annual Total Returns - Baron Durable Advantage 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 |
|
| Prospectus [Line Items] | |||||||||
| Annual Return Caption [Text] | Average Annual Total Returns for the Periods Ended December 31, 2025 | ||||||||
| Baron Durable Advantage Fund | |||||||||
| Prospectus [Line Items] | |||||||||
| Annual Return [Percent] | 16.25% | 26.87% | 45.11% | (24.99%) | 31.79% | 20.11% | 40.78% | (7.48%) | |