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Inventories - Major Classifications of Inventories (Detail) - USD ($) $ in Thousands	Dec. 31, 2019	Mar. 31, 2019
Inventory Disclosure [Abstract]
Raw materials and supplies	$ 2,854	$ 2,787
Work in process	16,463	20,553
Finished products	1,091	1,330
Total	$ 20,408	$ 24,670

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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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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 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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