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Property, Plant and Equipment (Details) (USD $)	12 Months Ended
	Apr. 27, 2013	Apr. 28, 2012	Apr. 30, 2011 Facility
Property, Plant and Equipment [Abstract]
Property, plant and equipment, gross	$ 441,035,000	$ 429,657,000
Accumulated depreciation	(322,975,000)	(315,291,000)
Net property, plant and equipment	118,060,000	114,366,000
Depreciation expense	19,800,000	21,300,000	22,000,000
Impairment charges			1,300,000
Number of facilities closed			1
Consolidated VIE [Member]
Property, Plant and Equipment [Abstract]
Impairment charges			1,800,000
Buildings and Building Fixtures [Member]
Property, Plant and Equipment [Abstract]
Property, plant and equipment, gross	171,346,000	168,451,000
Buildings and Building Fixtures [Member] | Minimum [Member]
Property, Plant and Equipment [Abstract]
Estimated Useful Lives	3 years
Buildings and Building Fixtures [Member] | Maximum [Member]
Property, Plant and Equipment [Abstract]
Estimated Useful Lives	40 years
Machinery and Equipment [Member]
Property, Plant and Equipment [Abstract]
Property, plant and equipment, gross	141,924,000	141,476,000
Machinery and Equipment [Member] | Minimum [Member]
Property, Plant and Equipment [Abstract]
Estimated Useful Lives	3 years
Machinery and Equipment [Member] | Maximum [Member]
Property, Plant and Equipment [Abstract]
Estimated Useful Lives	15 years
Information Systems and Software [Member]
Property, Plant and Equipment [Abstract]
Property, plant and equipment, gross	62,005,000	56,621,000
Information Systems and Software [Member] | Minimum [Member]
Property, Plant and Equipment [Abstract]
Estimated Useful Lives	3 years
Information Systems and Software [Member] | Maximum [Member]
Property, Plant and Equipment [Abstract]
Estimated Useful Lives	10 years
Land [Member]
Property, Plant and Equipment [Abstract]
Property, plant and equipment, gross	18,433,000	15,158,000
Land Improvements [Member]
Property, Plant and Equipment [Abstract]
Property, plant and equipment, gross	10,772,000	10,772,000
Land Improvements [Member] | Minimum [Member]
Property, Plant and Equipment [Abstract]
Estimated Useful Lives	3 years
Land Improvements [Member] | Maximum [Member]
Property, Plant and Equipment [Abstract]
Estimated Useful Lives	30 years
Transportation Equipment [Member]
Property, Plant and Equipment [Abstract]
Property, plant and equipment, gross	17,855,000	17,595,000
Transportation Equipment [Member] | Minimum [Member]
Property, Plant and Equipment [Abstract]
Estimated Useful Lives	3 years
Transportation Equipment [Member] | Maximum [Member]
Property, Plant and Equipment [Abstract]
Estimated Useful Lives	10 years
Furniture and Fixtures [Member]
Property, Plant and Equipment [Abstract]
Property, plant and equipment, gross	14,204,000	12,335,000
Furniture and Fixtures [Member] | Minimum [Member]
Property, Plant and Equipment [Abstract]
Estimated Useful Lives	3 years
Furniture and Fixtures [Member] | Maximum [Member]
Property, Plant and Equipment [Abstract]
Estimated Useful Lives	20 years
Construction in Progress [Member]
Property, Plant and Equipment [Abstract]
Property, plant and equipment, gross	4,496,000	7,249,000
Leasehold Improvements [Member]
Property, Plant and Equipment [Abstract]
Impairment charges			$ 1,300,000

X

- Definition

Number of facilities closed during period.

+ References

No definition available.

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- Definition

The cumulative amount of depreciation, depletion and amortization (related to property, plant and equipment, but not including land) that has been recognized in the income statement.

+ References

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

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 02

-Paragraph 14

-Article 5



Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher AICPA

-Name Accounting Principles Board Opinion (APB)

-Number 12

-Paragraph 5

-Subparagraph c

-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.



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

-Publisher AICPA

-Name Accounting Principles Board Opinion (APB)

-Number 12

-Paragraph 5

-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.



Reference 4: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 210

-SubTopic 10

-Section S99

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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 Statement of Financial Accounting Standard (FAS)

-Number 95

-Paragraph 28

-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.



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-Publisher AICPA

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-Paragraph 5

-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.



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

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- Definition

The aggregate amount of write-downs for impairments recognized during the period for long lived assets held for use (including those held for disposal by means other than sale).

+ References

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

-Publisher FASB

-Name Statement of Financial Accounting Standard (FAS)

-Number 144

-Paragraph 26

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-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.



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-Publisher FASB

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-Number 144

-Paragraph 7, 25

-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

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Gross amount of long-lived 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, furniture and fixtures, and computer equipment.

+ References

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

-Publisher AICPA

-Name Accounting Principles Board Opinion (APB)

-Number 12

-Paragraph 5

-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.



Reference 2: http://www.xbrl.org/2003/role/presentationRef

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Amount, net of accumulated depreciation, depletion and amortization, of long-lived 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, furniture and fixtures, and computer equipment.

+ References

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

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 03

-Paragraph 8

-Article 7



Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Statement of Financial Accounting Standard (FAS)

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-Paragraph 5

-Subparagraph b, c

-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.



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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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