Shareholder Report, Average Annual Return (Details) 190991_Buffalo High Yield Fund_Institutional Class_TSR Annual {Institutional Class} |
12 Months Ended | 60 Months Ended | 81 Months Ended |
|---|---|---|---|
Mar. 31, 2026 |
Mar. 31, 2026 |
Mar. 31, 2026 |
|
| Institutional Class | |||
| Average Annual Return [Line Items] | |||
| Line Graph and Table Measure Name | Buffalo High Yield Fund Institutional Class | ||
| Average Annual Return, Percent | 4.70% | 4.90% | 5.90% |
| Bloomberg U.S. Universal Bond Index [Member] | |||
| Average Annual Return [Line Items] | |||
| Line Graph and Table Measure Name | Bloomberg U.S. Universal Bond Index | ||
| Average Annual Return, Percent | 4.64% | 0.65% | 1.50% |
| ICE BofA U.S. High Yield Index [Member] | |||
| Average Annual Return [Line Items] | |||
| Line Graph and Table Measure Name | ICE BofA U.S. High Yield Index | ||
| Average Annual Return, Percent | 6.98% | 4.25% | 4.75% |