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Inventories - Components of Inventories (Detail) - USD ($)
$ in Thousands
Jan. 31, 2019
Jan. 31, 2018
Inventory Disclosure [Abstract]    
Materials and Supplies $ 17,517 $ 13,715
Work-in-Progress 1,633 1,404
Finished Goods 15,688 17,210
Inventory, Gross 34,838 32,329
Inventory Reserve (4,677) (4,720)
Inventories $ 30,161 $ 27,609