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Inventories - Major Classifications of Inventories (Detail) - USD ($) $ in Thousands | Mar. 31, 2025 | Mar. 31, 2024
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Inventory Disclosure [Abstract] |  |
Raw materials and supplies | $ 5,859 | $ 4,396
Work in process | 32,579 | 27,065
Finished products | 1,587 | 1,949
Total | $ 40,025 | $ 33,410

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