Amount of accumulated depreciation, depletion and amortization for physical assets used in the normal conduct of business to produce goods and services.

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The amount of expense recognized in the current period that reflects the allocation of the cost of tangible assets over the assets' useful lives. Includes production and non-production related depreciation.

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The aggregate amount of write-downs for impairments recognized during the period for long-lived assets held for abandonment, exchange or sale.

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Amount before accumulated depreciation, depletion and amortization of physical assets used in the normal conduct of business and not intended for resale. Examples include, but are not limited to, land, buildings, machinery and equipment, office equipment, and furniture and fixtures.

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Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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Amount after accumulated depreciation, depletion and amortization of physical assets used in the normal conduct of business to produce goods and services and not intended for resale. Examples include, but are not limited to, land, buildings, machinery and equipment, office equipment, and furniture and fixtures.

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Property and Equipment, net (Details) - USD ($)	3 Months Ended	12 Months Ended
Property and Equipment, net (Details) - USD ($)	Apr. 30, 2019	Apr. 30, 2020	Apr. 30, 2019	Apr. 30, 2018
Property and equipment, net
Property and equipment, gross	$ 92,368,000	$ 101,687,000	$ 92,368,000
Less accumulated depreciation and amortization	(75,463,000)	(79,993,000)	(75,463,000)
Property and equipment, net	16,905,000	21,694,000	16,905,000
Depreciation expense		7,066,000	7,311,000	$ 5,676,000
Impairment loss			4,398,000	$ 255,000
Leasehold improvements
Property and equipment, net
Property and equipment, gross	12,324,000	16,387,000	12,324,000
Machinery and equipment
Property and equipment, net
Property and equipment, gross	40,432,000	46,519,000	40,432,000
Furniture and fixtures
Property and equipment, net
Property and equipment, gross	2,145,000	3,031,000	2,145,000
Computer equipment and software
Property and equipment, net
Property and equipment, gross	35,056,000	33,242,000	35,056,000
Construction in process
Property and equipment, net
Property and equipment, gross	2,411,000	$ 2,508,000	$ 2,411,000
UAS Quantix Solution
Property and equipment, net
Impairment loss	$ 4,398,000