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

The increase (decrease) during the reporting period in the aggregate value of all inventory held by the reporting entity, associated with underlying transactions that are classified as operating activities.

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Amount before valuation and LIFO reserves of completed merchandise or goods expected to be sold within one year or operating cycle, if longer.

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Gross amount, as of the balance sheet date, of merchandise, goods, commodities, or supplies held for future sale or to be used in manufacturing, servicing or production process.

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Amount by which inventory stated at last-in first-out (LIFO) is less than (in excess of) inventory stated at other inventory cost methods.

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Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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Amount before valuation and LIFO reserves of raw materials expected to be sold, or consumed within one year or operating cycle, if longer.

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Carrying amount, net of valuation reserves and adjustments, as of the balance sheet date of products used directly or indirectly in the manufacturing or production process, which may or may not become part of the final product. May also include items used in the storage, presentation or transportation of physical goods.

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Amount before valuation and LIFO reserves of merchandise or goods in the production process expected to be completed within one year or operating cycle, if longer.

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