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Amount of expense charged against earnings to allocate the cost of tangible and intangible assets over their remaining economic lives, classified as other.

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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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Amount after accumulated depreciation, depletion and amortization of physical assets used in the normal conduct of business to produce goods and services 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	12 Months Ended
	Apr. 30, 2022	Apr. 30, 2021	Apr. 30, 2020
Property, Plant and Equipment [Line Items]
Property, plant and equipment, gross	$ 541,328	$ 501,596
Less accumulated amortization and depreciation	(327,520)	(297,594)
Property, Plant and Equipment, Net, Total	213,808	204,002
Amortization and depreciation expense on property, plant and equipment	38,000	38,300	$ 36,900
Finance Lease, Right-of-Use Asset, Accumulated Amortization	32,800	33,000
Land [Member]
Property, Plant and Equipment [Line Items]
Property, plant and equipment, gross	4,431	4,431
Buildings And Improvements [Member]
Property, Plant and Equipment [Line Items]
Property, plant and equipment, gross	119,066	116,103
Building And Improvements - Capital Leases [Member]
Property, Plant and Equipment [Line Items]
Property, plant and equipment, gross	11,164	11,636
Machinery And Equipment [Member]
Property, Plant and Equipment [Line Items]
Property, plant and equipment, gross	324,417	312,555
Machinery And Equipment - Capital Leases [Member]
Property, Plant and Equipment [Line Items]
Property, plant and equipment, gross	31,341	31,386
Construction In Progress [Member]
Property, Plant and Equipment [Line Items]
Property, plant and equipment, gross	22,794	22,669
Software and Software Development Costs
Property, Plant and Equipment [Line Items]
Property, plant and equipment, gross	$ 28,115	$ 2,816