Inventories, net (Details) - USD ($) $ in Thousands	12 Months Ended
Apr. 30, 2020	Apr. 30, 2019	Apr. 30, 2018
Inventories, net
Raw materials	$ 15,988	$ 16,792
Work in process	10,340	19,162
Finished goods	29,439	25,926
Inventories, gross	55,767	61,880
Reserve for inventory excess and obsolescence	(10,232)	(7,824)
Inventories, net	45,535	54,056
Inventory reserve charge	5,377	$ 5,054	$ 2,758
UAS Quantix Solution
Inventories, net
Inventory reserve charge	$ 2,600

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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Amount of loss from reductions in inventory due to subsequent measurement adjustments, including, but not limited to, physical deterioration, obsolescence, or changes in price levels.

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