Shareholder Report, Line Graph (Details) 190996_Buffalo Growth Fund_Investor Class_TSR Annual {Investor Class} - USD ($) |
12 Months Ended | ||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|
Mar. 31, 2025 |
Mar. 31, 2024 |
Mar. 31, 2023 |
Mar. 31, 2022 |
Mar. 31, 2021 |
Mar. 31, 2020 |
Mar. 31, 2019 |
Mar. 31, 2018 |
Mar. 31, 2017 |
Mar. 31, 2016 |
Mar. 31, 2026 |
|
| Investor Class | |||||||||||
| Account Value [Line Items] | |||||||||||
| Line Graph and Table Measure Name | Buffalo Growth Fund Investor Class | ||||||||||
| Accumulated Value | $ 29,756 | $ 28,675 | $ 21,083 | $ 24,110 | $ 22,007 | $ 14,292 | $ 14,873 | $ 13,142 | $ 11,292 | $ 10,000 | $ 32,497 |
| Russell 3000 Index [Member] | |||||||||||
| Account Value [Line Items] | |||||||||||
| Line Graph and Table Measure Name | Russell 3000 Index | ||||||||||
| Accumulated Value | 30,620 | 28,558 | 22,088 | 24,161 | 21,587 | 13,282 | 14,616 | 13,438 | 11,807 | 10,000 | $ 36,157 |
| Russell 3000 Growth Index [Member] | |||||||||||
| Account Value [Line Items] | |||||||||||
| Line Graph and Table Measure Name | Russell 3000 Growth Index | ||||||||||
| Accumulated Value | $ 38,375 | $ 35,803 | $ 25,953 | $ 29,121 | $ 25,803 | $ 15,704 | $ 15,773 | $ 14,076 | $ 11,627 | $ 10,000 | $ 45,569 |