Property, Plant, and Equipment - Schedule of Property, Plant, and Equipment (Details) - USD ($) $ in Thousands	Jul. 31, 2025	Apr. 30, 2025
Property, Plant and Equipment [Line Items]
Property, plant and equipment, gross	$ 87,975	$ 87,309
Accumulated depreciation	(28,211)	(27,053)
Total property, plant and equipment	59,764	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	49,753	49,753
Aircraft
Property, Plant and Equipment [Line Items]
Property, plant and equipment, gross	8,122	8,122
Machinery and equipment
Property, Plant and Equipment [Line Items]
Property, plant and equipment, gross	6,667	6,356
Office furniture and fixtures
Property, Plant and Equipment [Line Items]
Property, plant and equipment, gross	15,954	15,599
Leasehold improvements
Property, Plant and Equipment [Line Items]
Property, plant and equipment, gross	$ 4,032	$ 4,032