Shareholder Report, Line Graph (Details) 190996_Buffalo Growth Fund_Institutional Class_TSR Annual {Institutional Class} - USD ($) |
12 Months Ended | |||||||
|---|---|---|---|---|---|---|---|---|
Mar. 31, 2025 |
Mar. 31, 2024 |
Mar. 31, 2023 |
Mar. 31, 2022 |
Mar. 31, 2021 |
Mar. 31, 2020 |
Jul. 01, 2019 |
Mar. 31, 2026 |
|
| Institutional Class | ||||||||
| Account Value [Line Items] | ||||||||
| Line Graph and Table Measure Name | Buffalo Growth Fund Institutional Class | |||||||
| Accumulated Value | $ 466,719 | $ 449,470 | $ 330,094 | $ 376,985 | $ 343,529 | $ 222,691 | $ 250,000 | $ 510,238 |
| Russell 3000 Index [Member] | ||||||||
| Account Value [Line Items] | ||||||||
| Line Graph and Table Measure Name | Russell 3000 Index | |||||||
| Accumulated Value | 499,505 | 465,873 | 360,323 | 394,141 | 352,149 | 216,670 | 250,000 | $ 589,843 |
| Russell 3000 Growth Index [Member] | ||||||||
| Account Value [Line Items] | ||||||||
| Line Graph and Table Measure Name | Russell 3000 Growth Index | |||||||
| Accumulated Value | $ 576,853 | $ 538,186 | $ 390,121 | $ 437,754 | $ 387,877 | $ 236,058 | $ 250,000 | $ 684,989 |