Shareholder Report, Average Annual Return (Details) 190991_Buffalo High Yield Fund_Investor Class_TSR Annual {Investor Class} |
12 Months Ended | 60 Months Ended | 120 Months Ended |
|---|---|---|---|
Mar. 31, 2026 |
Mar. 31, 2026 |
Mar. 31, 2026 |
|
| Investor Class | |||
| Average Annual Return [Line Items] | |||
| Line Graph and Table Measure Name | Buffalo High Yield Fund Investor Class | ||
| Average Annual Return, Percent | 4.55% | 4.75% | 5.64% |
| 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% | 2.11% |
| 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% | 6.08% |