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Inventories - Major Classifications of Inventories (Detail) - USD ($) $ in Thousands | Jun. 30, 2025 | Mar. 31, 2025
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Inventory Disclosure [Abstract] |  |
Raw materials and supplies | $ 5,806 | $ 5,859
Work in process | 30,069 | 32,579
Finished products | 1,511 | 1,587
Total | $ 37,386 | $ 40,025

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