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

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)
-URI http://asc.fasb.org/extlink&oid=6391035&loc=d3e2868-110229

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-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
-Topic 230
-SubTopic 10
-Section 45
-Paragraph 28
-Subparagraph (b)
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- Definition

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
-Publisher FASB
-Name Accounting Standards Codification
-Topic 360
-SubTopic 10
-Section 50
-Paragraph 1
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=6391035&loc=d3e2868-110229

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02.13)
-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

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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.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02.13)
-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 360
-SubTopic 10
-Section 50
-Paragraph 1
-URI http://asc.fasb.org/extlink&oid=6391035&loc=d3e2868-110229

Reference 3: http://www.xbrl.org/2003/role/presentationRef
-Publisher SEC
-Name Regulation S-X (SX)
-Number 210
-Section 02
-Paragraph 13
-Subparagraph a
-Article 5

Reference 4: http://www.xbrl.org/2003/role/presentationRef
-Publisher SEC
-Name Regulation S-X (SX)
-Number 210
-Section 03
-Paragraph 8
-Article 7

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- Definition

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

No definition available.

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Property, Plant and Equipment (Details) - USD ($) $ in Thousands	12 Months Ended
	Apr. 30, 2016	Apr. 25, 2015	Apr. 26, 2014
Property, Plant and Equipment
Gross property, plant and equipment	$ 482,990	$ 500,029
Accumulated depreciation	(311,400)	(325,993)
Net property, plant and equipment	171,590	174,036
Depreciation expense	23,300	19,300	$ 19,300
Buildings and building fixtures
Property, Plant and Equipment
Gross property, plant and equipment	$ 192,211	202,482
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	$ 143,561	142,949
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	$ 72,275	72,200
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	$ 14,346	15,409
Land improvements
Property, Plant and Equipment
Gross property, plant and equipment	$ 15,007	14,747
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	$ 15,728	17,051
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	$ 19,397	20,996
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	$ 10,465	$ 14,195