Shareholder Report, Line Graph (Details) 190987_Buffalo Growth - Income Fund_Investor Class_TSR Annual {Investor Class} - USD ($) |
12 Months Ended | ||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|
Mar. 31, 2025 |
Mar. 31, 2024 |
Mar. 31, 2023 |
Mar. 31, 2022 |
Mar. 31, 2021 |
Mar. 31, 2020 |
Mar. 31, 2019 |
Mar. 31, 2018 |
Mar. 31, 2017 |
Mar. 31, 2016 |
Mar. 31, 2026 |
|
| Investor Class | |||||||||||
| Account Value [Line Items] | |||||||||||
| Line Graph and Table Measure Name | Buffalo Growth & Income Fund Investor Class | ||||||||||
| Accumulated Value | $ 28,920 | $ 26,995 | $ 21,203 | $ 22,137 | $ 19,523 | $ 12,654 | $ 13,801 | $ 12,841 | $ 11,835 | $ 10,000 | $ 31,678 |
| Russell 3000 Index [Member] | |||||||||||
| Account Value [Line Items] | |||||||||||
| Line Graph and Table Measure Name | Russell 3000 Index | ||||||||||
| Accumulated Value | 30,620 | 28,558 | 22,088 | 24,161 | 21,587 | 13,282 | 14,616 | 13,438 | 11,807 | 10,000 | $ 36,157 |
| Russell 1000 Index [Member] | |||||||||||
| Account Value [Line Items] | |||||||||||
| Line Graph and Table Measure Name | Russell 1000 Index | ||||||||||
| Accumulated Value | $ 31,394 | $ 29,116 | $ 22,420 | $ 24,474 | $ 21,607 | $ 13,455 | $ 14,629 | $ 13,384 | $ 11,743 | $ 10,000 | $ 36,964 |