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Property and Equipment, net (Details) - USD ($)
12 Months Ended
Apr. 30, 2025
Apr. 30, 2024
Apr. 30, 2023
Property and equipment, net      
Property and equipment, gross $ 230,439,000 $ 221,754,000  
Less accumulated depreciation and amortization (179,735,000) (175,152,000)  
Property and equipment, net 50,704,000 46,602,000  
Depreciation expense 17,063,000 17,098,000 $ 41,803,000
Impairment loss     $ 16,597,000
Loss on disposal of property and equipment 1,979,000 1,486,000  
In-service ISR assets      
Property and equipment, net      
Property and equipment, gross 1,486,000    
Land, building, and leasehold improvements      
Property and equipment, net      
Property and equipment, gross 31,472,000 26,921,000  
Machinery and equipment      
Property and equipment, net      
Property and equipment, gross 131,236,000 132,862,000  
Furniture and fixtures      
Property and equipment, net      
Property and equipment, gross 7,324,000 5,896,000  
Computer equipment and software      
Property and equipment, net      
Property and equipment, gross 50,617,000 48,817,000  
Construction in process      
Property and equipment, net      
Property and equipment, gross $ 8,304,000 $ 7,258,000