Inventories - Schedule of Inventories (Detail) - USD ($) $ in Thousands	Jan. 31, 2021	Jan. 31, 2020
Inventory Disclosure [Abstract]
Raw materials	$ 6,905	$ 7,388
Finished goods	3,466	3,758
Work in progress	2,445	2,720
Cost of inventories	12,816	13,866
Less allowance for obsolescence	(1,363)	(1,210)
Net inventories	$ 11,453	$ 12,656

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Amount before valuation and LIFO reserves of completed merchandise or goods expected to be sold within one year or operating cycle, if longer.

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Gross amount, as of the balance sheet date, of merchandise, goods, commodities, or supplies held for future sale or to be used in manufacturing, servicing or production process.

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Amount after valuation and LIFO reserves of inventory expected to be sold, or consumed within one year or operating cycle, if longer.

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Amount before valuation and LIFO reserves of raw materials expected to be sold, or consumed within one year or operating cycle, if longer.

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Amount of valuation reserve for inventory.

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Amount before valuation and LIFO reserves of merchandise or goods in the production process expected to be completed within one year or operating cycle, if longer.

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