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Property, Plant and Equipment (Details) - USD ($) $ in Thousands	12 Months Ended
	Apr. 25, 2020	Apr. 27, 2019	Apr. 28, 2018
Property, Plant and Equipment
Gross property, plant and equipment	$ 578,423	$ 547,588
Accumulated depreciation	(363,656)	(347,065)
Net property, plant and equipment	214,767	200,523
Depreciation expense	$ 30,000	27,500	$ 27,500
Minimum
Property, Plant and Equipment
Estimated Useful Lives	3 years
Maximum
Property, Plant and Equipment
Estimated Useful Lives	7 years
Buildings and building fixtures
Property, Plant and Equipment
Gross property, plant and equipment	$ 233,063	223,505
Buildings and building fixtures | Minimum
Property, Plant and Equipment
Estimated Useful Lives	3 years
Buildings and building fixtures | Maximum
Property, Plant and Equipment
Estimated Useful Lives	40 years
Machinery and equipment
Property, Plant and Equipment
Gross property, plant and equipment	$ 155,776	148,760
Machinery and equipment | Minimum
Property, Plant and Equipment
Estimated Useful Lives	3 years
Machinery and equipment | Maximum
Property, Plant and Equipment
Estimated Useful Lives	15 years
Information systems and software
Property, Plant and Equipment
Gross property, plant and equipment	$ 90,705	86,400
Information systems and software | Minimum
Property, Plant and Equipment
Estimated Useful Lives	3 years
Information systems and software | Maximum
Property, Plant and Equipment
Estimated Useful Lives	7 years
Furniture and fixtures
Property, Plant and Equipment
Gross property, plant and equipment	$ 23,890	22,826
Furniture and fixtures | Minimum
Property, Plant and Equipment
Estimated Useful Lives	3 years
Furniture and fixtures | Maximum
Property, Plant and Equipment
Estimated Useful Lives	15 years
Land improvements
Property, Plant and Equipment
Gross property, plant and equipment	$ 17,427	17,454
Land improvements | Minimum
Property, Plant and Equipment
Estimated Useful Lives	3 years
Land improvements | Maximum
Property, Plant and Equipment
Estimated Useful Lives	30 years
Transportation equipment
Property, Plant and Equipment
Gross property, plant and equipment	$ 15,092	13,598
Transportation equipment | Minimum
Property, Plant and Equipment
Estimated Useful Lives	3 years
Transportation equipment | Maximum
Property, Plant and Equipment
Estimated Useful Lives	10 years
Land
Property, Plant and Equipment
Gross property, plant and equipment	$ 14,236	14,323
Construction in progress
Property, Plant and Equipment
Gross property, plant and equipment	$ 28,234	$ 20,722

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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