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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The amount of expense recognized in the current period that reflects the allocation of the cost of tangible assets over the assets' useful lives. Includes production and non-production related depreciation.

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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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Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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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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Useful life of long lived, physical assets used in the normal conduct of business and not intended for resale, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. Examples include, but not limited to, land, buildings, machinery and equipment, office equipment, furniture and fixtures, and computer equipment.

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Property, Plant and Equipment (Details) - USD ($) $ in Thousands	12 Months Ended
	Apr. 27, 2019	Apr. 28, 2018	Apr. 29, 2017
Property, Plant and Equipment
Gross property, plant and equipment	$ 547,588	$ 520,772
Accumulated depreciation	(347,065)	(339,890)
Net property, plant and equipment	200,523	180,882
Depreciation expense	27,500	27,500	$ 25,400
Buildings and building fixtures
Property, Plant and Equipment
Gross property, plant and equipment	$ 223,505	200,370
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	$ 148,760	147,542
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	$ 86,400	84,881
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	10 years
Land
Property, Plant and Equipment
Gross property, plant and equipment	$ 14,323	14,626
Land improvements
Property, Plant and Equipment
Gross property, plant and equipment	$ 17,454	15,362
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	$ 13,598	13,929
Transportation equipment \| Minimum
Property, Plant and Equipment
Estimated Useful Lives	3 years
Transportation equipment \| Maximum
Property, Plant and Equipment
Estimated Useful Lives	10 years
Furniture and fixtures
Property, Plant and Equipment
Gross property, plant and equipment	$ 22,826	20,812
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
Construction in progress
Property, Plant and Equipment
Gross property, plant and equipment	$ 20,722	$ 23,250