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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Amount of gain (loss) on sale or disposal of assets, including but not limited to property plant and equipment, intangible assets and equity in securities of subsidiaries or equity method investee.

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Property and Equipment, net (Details) - USD ($)	12 Months Ended
Property and Equipment, net (Details) - USD ($)	Apr. 30, 2022	Apr. 30, 2021	Apr. 30, 2020
Property and equipment, net
Property and equipment, gross	$ 184,430,000	$ 151,698,000
Less accumulated depreciation and amortization	(122,134,000)	(92,802,000)
Property and equipment, net	62,296,000	58,896,000
Depreciation expense	30,493,000	12,793,000	$ 7,066,000
Loss on disposal of property and equipment	1,378,000
In-service ISR assets
Property and equipment, net
Property and equipment, gross	48,496,000	36,047,000
Leasehold improvements
Property and equipment, net
Property and equipment, gross	20,842,000	18,703,000
Machinery and equipment
Property and equipment, net
Property and equipment, gross	64,759,000	53,943,000
Furniture and fixtures
Property and equipment, net
Property and equipment, gross	4,239,000	3,698,000
Computer equipment and software
Property and equipment, net
Property and equipment, gross	41,476,000	36,618,000
Construction in process
Property and equipment, net
Property and equipment, gross	$ 4,618,000	$ 2,689,000