Shareholder Report, Average Annual Return (Details) 190987_Buffalo Growth - Income 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 Growth & Income Fund Investor Class | ||
| Average Annual Return, Percent | 9.54% | 10.16% | 12.22% |
| Russell 3000 Index [Member] | |||
| Average Annual Return [Line Items] | |||
| Line Graph and Table Measure Name | Russell 3000 Index | ||
| Average Annual Return, Percent | 18.09% | 10.87% | 13.72% |
| Russell 1000 Index [Member] | |||
| Average Annual Return [Line Items] | |||
| Line Graph and Table Measure Name | Russell 1000 Index | ||
| Average Annual Return, Percent | 17.74% | 11.34% | 13.97% |