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Property and Equipment, net (Details) - USD ($)	12 Months Ended
	Apr. 30, 2021	Apr. 30, 2020	Apr. 30, 2019
Property and equipment, net
Property and equipment, gross	$ 151,698,000	$ 101,687,000
Less accumulated depreciation and amortization	(92,802,000)	(79,993,000)
Property and equipment, net	58,896,000	21,694,000
Depreciation expense	12,793,000	7,066,000	$ 7,311,000
Impairment loss			4,398,000
In-service ISR assets
Property and equipment, net
Property and equipment, gross	36,047,000
Leasehold improvements
Property and equipment, net
Property and equipment, gross	18,703,000	16,387,000
Machinery and equipment
Property and equipment, net
Property and equipment, gross	53,943,000	46,519,000
Furniture and fixtures
Property and equipment, net
Property and equipment, gross	3,698,000	3,031,000
Computer equipment and software
Property and equipment, net
Property and equipment, gross	36,618,000	33,242,000
Construction in process
Property and equipment, net
Property and equipment, gross	$ 2,689,000	$ 2,508,000
UAS Quantix Solution
Property and equipment, net
Impairment loss			$ 4,398,000

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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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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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