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Inventories (Details) - USD ($) $ in Thousands | Dec. 31, 2019 | Mar. 31, 2019
--- | --- | ---
Inventory [Line Items] |  |
Raw materials | $ 93,778 | $ 88,786
Work-in-process | 24,819 | 32,547
Finished goods | 35,204 | 40,523
At cost - FIFO basis: | 153,801 | 161,856
LIFO cost less than FIFO cost | (18,352) | (15,593)
Net inventories | $ 135,449 | $ 146,263

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