Property, Plant, and Equipment - Summary of Property, Plant, and Equipment (Detail) - USD ($) $ in Thousands	Apr. 30, 2022	Apr. 30, 2021
Property Plant And Equipment [Abstract]
Machinery and equipment	$ 17,664	$ 15,041
Computer and other equipment	2,095	1,071
Leasehold improvements	2,364	2,273
Property plant and equipment gross	22,123	18,385
Less: Accumulated depreciation and amortization	(12,635)	(10,454)
Property plant and equipment before construction in progress	9,488	7,931
Construction in progress	1,133	1,784
Total property, plant, and equipment, net	$ 10,621	$ 9,715

Computer and other equipment gross.

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Property plant and equipment gross excluding construction in progress.

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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 of structure or a modification to a structure under construction. Includes recently completed structures or modifications to structures that have not been placed into service.

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Amount before accumulated depreciation of additions or improvements to assets held under a lease arrangement.

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Amount before accumulated depreciation of tangible personal property used to produce goods and services, including, but is not limited to, tools, dies and molds, computer and office equipment.

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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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