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Selected Financial Statement Data - Property and Equipment (Details) - USD ($) $ in Thousands	Apr. 27, 2019	Apr. 28, 2018
Property, Plant and Equipment [Line Items]
Property and equipment, gross	$ 241,706	$ 237,209
Less accumulated depreciation	176,392	169,150
Property and equipment, net	65,314	68,059
Land
Property, Plant and Equipment [Line Items]
Property and equipment, gross	1,738	2,161
Buildings
Property, Plant and Equipment [Line Items]
Property and equipment, gross	66,403	67,773
Machinery and equipment
Property, Plant and Equipment [Line Items]
Property and equipment, gross	96,486	93,439
Office furniture and equipment
Property, Plant and Equipment [Line Items]
Property and equipment, gross	6,195	5,878
Computer software and hardware
Property, Plant and Equipment [Line Items]
Property and equipment, gross	55,460	53,004
Equipment held for rental
Property, Plant and Equipment [Line Items]
Property and equipment, gross	287	287
Demonstration equipment
Property, Plant and Equipment [Line Items]
Property and equipment, gross	7,422	7,035
Transportation equipment
Property, Plant and Equipment [Line Items]
Property and equipment, gross	$ 7,715	$ 7,632

X

- Definition

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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