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Inventories (Details) - USD ($) $ in Thousands | 3 Months Ended |
--- | --- | ---
Jun. 30, 2021 | Jun. 30, 2020 | Mar. 31, 2021
Inventory [Line Items] |  |  |
Raw materials | $ 97,516 |  | $ 79,981
Work-in-process | 29,404 |  | 23,067
Finished goods | 31,536 |  | 27,201
At cost - FIFO basis: | 158,456 |  | 130,249
LIFO cost less than FIFO cost | (19,798) |  | (18,761)
Net inventories | 138,658 |  | $ 111,488
Increase (Decrease) in Inventories | 10,802 | $ (3,924) |
Dorner |  |  |
Inventory [Line Items] |  |  |
Increase (Decrease) in Inventories | $ 13,768 |  |

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