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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Amount before accumulated depreciation, depletion and amortization of physical assets used in the normal conduct of business 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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Property, Plant and Equipment (Details) - USD ($) $ in Thousands	3 Months Ended
	Jul. 31, 2021	Jul. 31, 2020	Apr. 30, 2021
Property, Plant and Equipment [Line Items]
Property, plant and equipment, gross	$ 513,631		$ 501,596
Less accumulated amortization and depreciation	(306,699)		(297,594)
Property, Plant and Equipment, Net, Total	206,932		204,002
Amortization and depreciation expense on property, plant and equipment	9,600	$ 11,600
Accumulated amortization on capital leases	33,500		33,000
Humboldt Facility
Property, Plant and Equipment [Line Items]
Depreciation		$ 1,100
Land
Property, Plant and Equipment [Line Items]
Property, plant and equipment, gross	4,431		4,431
Buildings and improvements
Property, Plant and Equipment [Line Items]
Property, plant and equipment, gross	116,851		116,103
Buildings and improvements - finance leases
Property, Plant and Equipment [Line Items]
Property, plant and equipment, gross	11,636		11,636
Machinery and equipment
Property, Plant and Equipment [Line Items]
Property, plant and equipment, gross	318,651		315,371
Machinery and equipment - finance leases
Property, Plant and Equipment [Line Items]
Property, plant and equipment, gross	31,912		31,386
Construction in progress
Property, Plant and Equipment [Line Items]
Property, plant and equipment, gross	$ 30,150		$ 22,669