Shareholder Report, Line Graph (Details) 190992_Buffalo Blue Chip 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 Blue Chip Growth Fund Institutional Class | |||||||
| Accumulated Value | $ 522,381 | $ 496,741 | $ 356,872 | $ 396,385 | $ 358,981 | $ 228,618 | $ 250,000 | $ 611,947 |
| 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 1000 Growth Index [Member] | ||||||||
| Account Value [Line Items] | ||||||||
| Line Graph and Table Measure Name | Russell 1000 Growth Index | |||||||
| Accumulated Value | $ 596,426 | $ 553,461 | $ 398,183 | $ 446,902 | $ 388,688 | $ 238,834 | $ 250,000 | $ 708,628 |