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Inventories - Major Classifications of Inventories (Detail) - USD ($) $ in Thousands	Sep. 30, 2021	Mar. 31, 2021
Inventory Disclosure [Abstract]
Raw materials and supplies	$ 4,156	$ 3,490
Work in process	11,454	12,196
Finished products	2,112	1,646
Total	$ 17,722	$ 17,332

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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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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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