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

Reference 3: http://www.xbrl.org/2003/role/presentationRef

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 02

-Paragraph 14

-Article 5

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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)

-URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3602-108585

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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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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 360

-SubTopic 10

-Section 50

-Paragraph 1

-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

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

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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 $)	12 Months Ended
Property, Plant and Equipment (Details) (USD $)	Apr. 25, 2015	Apr. 26, 2014	Apr. 27, 2013
Property, Plant and Equipment
Gross property, plant and equipment	$ 500,029,000us-gaap_PropertyPlantAndEquipmentGross	$ 455,180,000us-gaap_PropertyPlantAndEquipmentGross
Accumulated depreciation	(325,993,000)	(327,645,000)
Net property, plant and equipment	174,036,000us-gaap_PropertyPlantAndEquipmentNet	127,535,000us-gaap_PropertyPlantAndEquipmentNet
Depreciation expense	19,300,000us-gaap_Depreciation	19,300,000us-gaap_Depreciation	19,700,000us-gaap_Depreciation
Buildings and building fixtures
Property, Plant and Equipment
Gross property, plant and equipment	202,482,000	161,490,000
Buildings and building fixtures \| Minimum
Property, Plant and Equipment
Useful Lives	3 years
Buildings and building fixtures \| Maximum
Property, Plant and Equipment
Useful Lives	40 years
Machinery and equipment
Property, Plant and Equipment
Gross property, plant and equipment	142,949,000	140,561,000
Machinery and equipment \| Minimum
Property, Plant and Equipment
Useful Lives	3 years
Machinery and equipment \| Maximum
Property, Plant and Equipment
Useful Lives	15 years
Information systems and software
Property, Plant and Equipment
Gross property, plant and equipment	72,200,000	64,208,000
Information systems and software \| Minimum
Property, Plant and Equipment
Useful Lives	3 years
Information systems and software \| Maximum
Property, Plant and Equipment
Useful Lives	10 years
Land
Property, Plant and Equipment
Gross property, plant and equipment	15,409,000	15,344,000
Land improvements
Property, Plant and Equipment
Gross property, plant and equipment	14,747,000	10,820,000
Land improvements \| Minimum
Property, Plant and Equipment
Useful Lives	3 years
Land improvements \| Maximum
Property, Plant and Equipment
Useful Lives	30 years
Transportation equipment
Property, Plant and Equipment
Gross property, plant and equipment	17,051,000	17,420,000
Transportation equipment \| Minimum
Property, Plant and Equipment
Useful Lives	3 years
Transportation equipment \| Maximum
Property, Plant and Equipment
Useful Lives	10 years
Furniture and fixtures
Property, Plant and Equipment
Gross property, plant and equipment	20,996,000	14,104,000
Furniture and fixtures \| Minimum
Property, Plant and Equipment
Useful Lives	3 years
Furniture and fixtures \| Maximum
Property, Plant and Equipment
Useful Lives	15 years
Construction in progress
Property, Plant and Equipment
Gross property, plant and equipment	$ 14,195,000	$ 31,233,000