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Inventories (Details) - USD ($) $ in Thousands | Jun. 30, 2019 | Mar. 31, 2019
--- | --- | ---
Inventory [Line Items] |  |
Raw materials | $ 97,546 | $ 88,786
Work-in-process | 30,978 | 32,547
Finished goods | 39,961 | 40,523
At cost - FIFO basis: | 168,485 | 161,856
LIFO cost less than FIFO cost | (17,517) | (15,593)
Net inventories | $ 150,968 | $ 146,263

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