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Inventories - Major Classifications of Inventories (Detail) - USD ($) $ in Thousands | Sep. 30, 2020 | Mar. 31, 2020
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Inventory Disclosure [Abstract] |  |
Raw materials and supplies | $ 3,302 | $ 3,061
Work in process | 14,832 | 18,018
Finished products | 2,481 | 1,212
Total | $ 20,615 | $ 22,291

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