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Leases - Components of operating lease expense (Details) - USD ($)
$ in Thousands
 12 Months Ended
Jan. 31, 2023
Jan. 31, 2022
Jan. 31, 2021
Leases      
Operating lease cost $ 4,182 $ 4,466 $ 4,590
Short-term lease cost 636 432 502
Total operating lease cost 4,818 4,898 5,092
Operating cash outflows from operating leases included in measurement of lease liabilities 4,240 4,857 4,831
New ROU assets obtained in exchange for lease obligations $ 864 $ 2,548 $ 2,337
Weighted average remaining lease term (years) 2 years 7 months 6 days 3 years 3 months 18 days  
Weighted average discount rate (%) 2.40% 2.10%