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Leases - Components of operating lease expense (Details) - USD ($)
$ in Thousands
 12 Months Ended
Jan. 31, 2024
Jan. 31, 2023
Jan. 31, 2022
Leases      
Operating lease cost $ 4,169 $ 4,182 $ 4,466
Short-term lease cost 597 636 432
Total operating lease cost 4,766 4,818 4,898
Operating cash outflows from operating leases included in measurement of lease liabilities 3,996 4,240 4,857
New ROU assets obtained in exchange for lease obligations $ 4,239 $ 864 $ 2,548
Weighted average remaining lease term (years) 3 years 2 years 7 months 6 days  
Weighted average discount rate (%) 4.10% 2.40%