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Inventories - Components of Inventories (Detail) - USD ($)
$ in Thousands
Jan. 31, 2017
Jan. 31, 2016
Inventory Disclosure [Abstract]    
Materials and Supplies $ 11,865 $ 10,197
Work-in-Progress 1,216 1,025
Finished Goods 10,270 7,491
Inventory, Gross 23,351 18,713
Inventory Reserve (3,845) (3,823)
Inventories $ 19,506 $ 14,890