Inventories - Components of Inventories (Detail) - USD ($) $ in Thousands	Jan. 31, 2020	Jan. 31, 2019
Inventory Disclosure [Abstract]
Materials and Supplies	$ 20,151	$ 17,517
Work-in-Progress	1,408	1,633
Finished Goods	17,992	15,688
Inventory, Gross	39,551	34,838
Inventory Reserve	(5,626)	(4,677)
Inventories	$ 33,925	$ 30,161