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Inventories, net (Details) - USD ($) $ in Thousands	Oct. 31, 2020	Apr. 30, 2020
Inventories, net
Raw materials	$ 21,060	$ 15,988
Work in process	10,960	10,340
Finished goods	28,356	29,439
Inventories, gross	60,376	55,767
Reserve for inventory excess and obsolescence	(8,597)	(10,232)
Inventories, net	$ 51,779	$ 45,535

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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 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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