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Property, Plant, and Equipment - Summary of Property, Plant, and Equipment (Detail) - USD ($) $ in Thousands	Apr. 30, 2018	Apr. 30, 2017
Property Plant And Equipment [Abstract]
Machinery and equipment	$ 251,706	$ 242,479
Software and hardware	43,097	39,526
Building and improvements	29,908	28,110
Land and improvements	3,845	3,573
Property plant and equipment gross	328,556	313,688
Less: Accumulated depreciation and amortization	(198,545)	(170,538)
Property plant and equipment before construction in progress	130,011	143,150
Construction in progress	29,114	6,535
Total property, plant, and equipment, net	$ 159,125	$ 149,685

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Computer hardware and software, 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.

+ References

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-Publisher FASB
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Amount before accumulated depreciation of building structures held for productive use including addition, improvement, or renovation to the structure, including, but not limited to, interior masonry, interior flooring, electrical, and plumbing.

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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 deprecation and depletion of real estate held for productive use and additions or improvements to real estate held for productive use, examples include, but are not limited to, walkways, driveways, fences, and parking lots. Excludes land held for sale.

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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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