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Inventories - Components of Inventories (Detail) - USD ($)
$ in Thousands
Jan. 31, 2021
Jan. 31, 2020
Inventory Disclosure [Abstract]    
Materials and Supplies $ 20,265 $ 20,151
Work-in-Progress 2,076 1,408
Finished Goods 16,371 17,992
Inventory, Gross 38,712 39,551
Inventory Reserve (8,652) (5,626)
Inventories $ 30,060 $ 33,925