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Selected Financial Statement Data Property and Equipment (Details) - USD ($) $ in Thousands	Oct. 27, 2018	Apr. 28, 2018
Property, Plant and Equipment [Line Items]
Land	$ 2,178	$ 2,161
Buildings	67,834	67,773
Machinery and equipment	97,437	93,439
Office furniture and equipment	6,073	5,878
Computer software and hardware	54,982	53,004
Equipment held for rental	287	287
Demonstration equipment	7,004	7,035
Transportation equipment	7,667	7,632
Property, Plant and Equipment, Gross	243,462	237,209
Accumulated Depreciation, Depletion and Amortization, Property, Plant, and Equipment	173,992	169,150
Property and equipment, net	$ 69,470	$ 68,059

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Gross amount, at the balance sheet date, capitalized computer software and equipment costs.

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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 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 before accumulated depreciation of equipment commonly used in offices and stores that have no permanent connection to the structure of a building or utilities. Examples include, but are not limited to, desks, chairs, tables, and bookcases.

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