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Inventory (Details) - USD ($)	Sep. 30, 2020	Mar. 31, 2020
Inventory [Abstract]
Raw materials	$ 106,790,000	$ 99,360,000
Work-in-process	8,527,000	3,906,000
Finished goods	128,101,000	135,601,000
Inventory, gross	243,418,000	238,867,000
Less allowance for excess and obsolete inventory	(13,752,000)	(13,208,000)
Inventory - net	229,666,000	225,659,000
Inventory unreturned	10,352,000	9,021,000
Total inventory	$ 240,018,000	$ 234,680,000

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- Definition

Carrying amount as of the balance sheet date of the added unit value of finished goods shipped to customers that the entity expects to be returned within the normal operating cycle of one year.

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Carrying amount of inventory net as of balance sheet date and the inventory the entity expects to be returned within the normal operating cycle of one year.

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- Definition

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 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 of valuation reserve for inventory.

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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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