Shareholder Report, Line Graph (Details) 190991_Buffalo High Yield 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 High Yield Fund Institutional Class | |||||||
| Accumulated Value | $ 351,569 | $ 327,185 | $ 291,498 | $ 295,900 | $ 289,748 | $ 227,648 | $ 250,000 | $ 368,106 |
| Bloomberg U.S. Universal Bond Index [Member] | ||||||||
| Account Value [Line Items] | ||||||||
| Line Graph and Table Measure Name | Bloomberg U.S. Universal Bond Index | |||||||
| Accumulated Value | 264,228 | 251,064 | 244,533 | 256,359 | 267,672 | 259,995 | 250,000 | $ 276,500 |
| ICE BofA U.S. High Yield Index [Member] | ||||||||
| Account Value [Line Items] | ||||||||
| Line Graph and Table Measure Name | ICE BofA U.S. High Yield Index | |||||||
| Accumulated Value | $ 319,658 | $ 296,871 | $ 267,163 | $ 276,850 | $ 277,666 | $ 225,181 | $ 250,000 | $ 341,971 |