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Inventories (Details) - USD ($)
$ in Thousands
Apr. 30, 2021
Jan. 31, 2021
Apr. 30, 2020
Inventory Disclosure [Abstract]      
Finished goods $ 16,887 $ 15,606 $ 27,348
WIP 14,630 11,907 19,159
Raw materials 11,358 10,757 11,683
Total inventories $ 42,875 $ 38,270 $ 58,190