Property and Equipment, net (Details) - USD ($)	12 Months Ended
Apr. 30, 2024	Apr. 30, 2023	Apr. 30, 2022
Property and equipment, net
Property and equipment, gross	$ 221,754,000	$ 202,793,000
Less accumulated depreciation and amortization	(175,152,000)	(162,998,000)
Property and equipment, net	46,602,000	39,795,000
Depreciation expense	17,098,000	41,803,000	$ 30,493,000
In-service ISR assets
Property and equipment, net
Property and equipment, gross	1,979,000	4,586,000
Impairment loss	16,597,000
Loss on disposal of property and equipment	0	192,000	$ 1,378,000
Leasehold improvements
Property and equipment, net
Property and equipment, gross	26,921,000	22,541,000
Machinery and equipment
Property and equipment, net
Property and equipment, gross	132,862,000	124,845,000
Furniture and fixtures
Property and equipment, net
Property and equipment, gross	5,896,000	4,756,000
Computer equipment and software
Property and equipment, net
Property and equipment, gross	48,817,000	44,689,000
Construction in process
Property and equipment, net
Property and equipment, gross	$ 7,258,000	$ 5,962,000

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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