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Inventories - Components of Inventories (Detail) - USD ($) $ in Thousands | Jul. 31, 2021 | Jan. 31, 2021
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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

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