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Inventories - Components of Inventories (Detail) - USD ($)
$ in Thousands
Jul. 31, 2021
Jan. 31, 2021
Inventory Disclosure [Abstract]    
Materials and Supplies $ 19,609 $ 20,265
Work-In-Process 2,205 2,076
Finished Goods 15,871 16,371
Inventory, Gross 37,685 38,712
Inventory Reserve (8,595) (8,652)
Inventories $ 29,090 $ 30,060