Shareholder Report, Line Graph (Details) 190988_Buffalo International 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 International Fund Investor Class | ||||||||||
| Accumulated Value | $ 20,796 | $ 21,261 | $ 19,173 | $ 19,213 | $ 18,847 | $ 12,417 | $ 13,448 | $ 13,424 | $ 11,346 | $ 10,000 | $ 22,711 |
| FTSE Global All Cap ex US Index [Member] | |||||||||||
| Account Value [Line Items] | |||||||||||
| Line Graph and Table Measure Name | FTSE Global All Cap ex US Index | ||||||||||
| Accumulated Value | 18,556 | 17,464 | 15,359 | 16,236 | 16,308 | 10,704 | 12,704 | 13,283 | 11,367 | 10,000 | $ 23,355 |
| FTSE All-World ex US Index [Member] | |||||||||||
| Account Value [Line Items] | |||||||||||
| Line Graph and Table Measure Name | FTSE All-World ex US Index | ||||||||||
| Accumulated Value | $ 18,839 | $ 17,665 | $ 15,497 | $ 16,281 | $ 16,379 | $ 10,849 | $ 12,771 | $ 13,274 | $ 11,385 | $ 10,000 | $ 23,654 |