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Property, Plant and Equipment (Details) - USD ($) $ in Thousands	12 Months Ended
	Apr. 28, 2018	Apr. 29, 2017	Apr. 30, 2016
Property, Plant and Equipment
Gross property, plant and equipment	$ 520,772	$ 490,857
Accumulated depreciation	(339,890)	(321,725)
Net property, plant and equipment	180,882	169,132
Depreciation expense	27,500	25,400	$ 23,300
Buildings and building fixtures
Property, Plant and Equipment
Gross property, plant and equipment	$ 200,370	196,817
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	$ 147,542	141,071
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	$ 84,881	76,684
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	$ 14,626	14,565
Land improvements
Property, Plant and Equipment
Gross property, plant and equipment	$ 15,362	15,178
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	$ 13,929	14,905
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	$ 20,812	20,390
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	$ 23,250	$ 11,247

X

- Definition

Amount of accumulated depreciation, depletion and amortization for physical assets used in the normal conduct of business to produce goods and services.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 360
-SubTopic 10
-Section 50
-Paragraph 1
-Subparagraph (c)
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Reference 2: http://www.xbrl.org/2003/role/presentationRef
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-Topic 210
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-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02.14)
-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

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- Definition

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.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
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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.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
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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.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
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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.

+ References

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