Inventories (Details) - USD ($) $ in Thousands	3 Months Ended	9 Months Ended
Dec. 31, 2021	Dec. 31, 2021	Dec. 31, 2020	Mar. 31, 2021
Inventory [Line Items]
Raw materials	$ 122,604	$ 122,604		$ 79,981
Work-in-process	38,655	38,655		23,067
Finished goods	35,919	35,919		27,201
At cost - FIFO basis:	197,178	197,178		130,249
LIFO cost less than FIFO cost	(22,079)	(22,079)		(18,761)
Net inventories	175,099	175,099		$ 111,488
Increase (Decrease) in Inventories		$ 42,215	$ (20,786)
Dorner
Inventory [Line Items]
Increase (Decrease) in Inventories	17,870
Garvey
Inventory [Line Items]
Increase (Decrease) in Inventories	$ 6,517

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

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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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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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