Shareholder Report, Average Annual Return (Details) 190988_Buffalo International 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 International Fund Investor Class | ||
| Average Annual Return, Percent | 9.21% | 3.80% | 8.55% |
| FTSE Global All Cap ex US Index [Member] | |||
| Average Annual Return [Line Items] | |||
| Line Graph and Table Measure Name | FTSE Global All Cap ex US Index | ||
| Average Annual Return, Percent | 25.86% | 7.45% | 8.85% |
| FTSE All-World ex US Index [Member] | |||
| Average Annual Return [Line Items] | |||
| Line Graph and Table Measure Name | FTSE All-World ex US Index | ||
| Average Annual Return, Percent | 25.56% | 7.63% | 8.99% |