Property, Plant and Equipment - Schedule of Property, Plant, and Equipment (Details) - USD ($) $ in Thousands	Oct. 31, 2025	Apr. 30, 2025
Property, Plant and Equipment [Line Items]
Property, plant and equipment, gross	$ 86,708	$ 87,309
Accumulated depreciation	(27,844)	(27,053)
Total property, plant and equipment	58,864	60,256
Land
Property, Plant and Equipment [Line Items]
Property, plant and equipment, gross	3,447	3,447
Building and improvements
Property, Plant and Equipment [Line Items]
Property, plant and equipment, gross	48,734	49,753
Aircraft
Property, Plant and Equipment [Line Items]
Property, plant and equipment, gross	6,846	8,122
Machinery and equipment
Property, Plant and Equipment [Line Items]
Property, plant and equipment, gross	7,114	6,356
Office furniture and fixtures
Property, Plant and Equipment [Line Items]
Property, plant and equipment, gross	16,535	15,599
Leasehold improvements
Property, Plant and Equipment [Line Items]
Property, plant and equipment, gross	$ 4,032	$ 4,032