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Inventories, net (Details) - USD ($)	3 Months Ended		9 Months Ended
	Jan. 25, 2020	Jan. 26, 2019	Jan. 25, 2020	Jan. 26, 2019	Apr. 30, 2019
Inventories, net
Raw materials	$ 19,119,000		$ 19,119,000		$ 16,792,000
Work in process	33,005,000		33,005,000		19,162,000
Finished goods	23,169,000		23,169,000		25,926,000
Inventories, gross	75,293,000		75,293,000		61,880,000
Reserve for inventory excess and obsolescence	(10,137,000)		(10,137,000)		(7,824,000)
Inventories, net	65,156,000		65,156,000		$ 54,056,000
Inventory reserve charge	$ 617,000		3,807,000
Impairment of long-lived assets		$ 1,889,000		$ 3,079,000
UAS Quantix Solution
Inventories, net
Inventory reserve charge			$ 2,600,000

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Amount of write-down of assets recognized in the income statement. Includes, but is not limited to, losses from tangible assets, intangible assets and goodwill.

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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 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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