Inventories, net (Details) - USD ($)	3 Months Ended	6 Months Ended
Oct. 26, 2019	Oct. 27, 2018	Oct. 26, 2019	Oct. 27, 2018	Apr. 30, 2019
Inventories, net
Raw materials	$ 16,695,000		$ 16,695,000		$ 16,792,000
Work in process	24,124,000		24,124,000		19,162,000
Finished goods	22,651,000		22,651,000		25,926,000
Inventories, gross	63,470,000		63,470,000		61,880,000
Reserve for inventory excess and obsolescence	(10,701,000)		(10,701,000)		(7,824,000)
Inventories, net	52,769,000		52,769,000		$ 54,056,000
Inventory reserve charge	2,612,000		$ 3,190,000
Impairment of long-lived assets		$ 841,000		$ 1,190,000
UAS Quantix Solution
Inventories, net
Inventory reserve charge	$ 2,600,000,000

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 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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