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Leases - Components of Operating Lease Expense (Details) - USD ($)
$ in Thousands
 3 Months Ended 6 Months Ended
Jul. 31, 2022
Jul. 31, 2021
Jul. 31, 2022
Jul. 31, 2021
Jan. 31, 2022
Leases          
Operating lease cost $ 1,078 $ 1,122 $ 2,143 $ 2,215  
Short-term lease cost 150 53 299 170  
Total operating lease cost 1,228 1,175 2,442 2,385  
Operating cash outflows from operating leases included in measurement of lease liabilities 1,148 1,358 2,264 2,560  
New ROU assets obtained in exchange for lease obligations $ 122 $ 833 $ 346 $ 1,161  
Weighted average remaining lease term (years) 2 years 10 months 24 days   2 years 10 months 24 days   3 years 3 months 18 days
Weighted average discount rate (%) 2.20%   2.20%   2.10%