Property and Equipment, net (Details) - USD ($)	12 Months Ended
Apr. 30, 2023	Apr. 30, 2022	Apr. 30, 2021
Property and equipment, net
Property and equipment, gross	$ 202,793,000	$ 184,430,000
Less accumulated depreciation and amortization	(162,998,000)	(122,134,000)
Property and equipment, net	39,795,000	62,296,000
Depreciation expense	41,803,000	30,493,000	$ 12,793,000
Loss on disposal of property and equipment	192,000	1,378,000	$ 298,000
In-service ISR assets
Property and equipment, net
Property and equipment, gross	4,586,000	48,496,000
Impairment loss	16,597,000
Leasehold improvements
Property and equipment, net
Property and equipment, gross	22,541,000	20,842,000
Machinery and equipment
Property and equipment, net
Property and equipment, gross	124,845,000	64,759,000
Furniture and fixtures
Property and equipment, net
Property and equipment, gross	4,756,000	4,239,000
Computer equipment and software
Property and equipment, net
Property and equipment, gross	44,689,000	41,476,000
Construction in process
Property and equipment, net
Property and equipment, gross	$ 5,962,000	$ 4,618,000

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 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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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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