Supplemental financial statement information - Schedule of Components of Operating Lease Costs (Details) - USD ($) $ in Thousands |
3 Months Ended | 6 Months Ended | ||
|---|---|---|---|---|
Jul. 31, 2026 |
Jul. 31, 2025 |
Jul. 31, 2026 |
Jul. 31, 2025 |
|
| Organization, Consolidation and Presentation of Financial Statements [Abstract] | ||||
| Operating lease expense | $ 2,159 | $ 2,234 | $ 4,368 | $ 4,474 |
| Sublease income | (968) | (1,338) | (2,344) | (2,572) |
| Net operating lease expense | $ 1,191 | $ 896 | $ 2,024 | $ 1,902 |