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Inventories (Details) - USD ($) $ in Thousands | 6 Months Ended |
--- | --- | ---
Sep. 30, 2023 | Sep. 30, 2022 | Mar. 31, 2023
Inventory [Line Items] |  |  |
Raw materials | $ 166,637 |  | $ 142,490
Work-in-process | 29,831 |  | 26,323
Finished goods | 40,898 |  | 39,714
At cost - FIFO basis: | 237,366 |  | 208,527
LIFO cost less than FIFO cost | (32,369) |  | (29,168)
Inventory, Supplies, Net of Reserves | 204,997 |  | $ 179,359
Increase (Decrease) in Inventories | 22,415 | $ 30,754 |
montratec |  |  |
Inventory [Line Items] |  |  |
Increase (Decrease) in Inventories | $ 6,649 |  |

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