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Restructuring (Details) (USD $) | 3 Months Ended
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Jul. 26, 2014 facility | Jul. 27, 2013
Restructuring |  |
Number of facilities currently being marketed for sale | 2 |
Restructuring charges |  |
Pre-tax restructuring charges since inception of plan | $ 7,700,000 |
Restructuring charges since inception of plan, net of tax | 5,000,000 |
Pre-tax restructuring income | 347,000 | (87,000)
Restructuring income, net of tax | (200,000) |
Restructuring liability | 400,000 |
Continuing Operations [Member] |  |
Restructuring charges |  |
Pre-tax restructuring charges since inception of plan | 4,500,000 |
Restructuring charges since inception of plan, net of tax | 2,900,000 |
Discontinued Operations [Member] |  |
Restructuring charges |  |
Pre-tax restructuring charges since inception of plan | 3,200,000 |
Restructuring charges since inception of plan, net of tax | $ 2,100,000 |

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- Definition Amount of costs incurred to date for the specified restructuring cost. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 420 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=6394359&loc=d3e17939-110869 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 420 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SAB TOPIC 5.P.4(b)) -URI http://asc.fasb.org/extlink&oid=27011515&loc=d3e140904-122747 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Staff Accounting Bulletin (SAB) -Number Topic 5 -Section P -Subsection 3, 4 + Details
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- Definition Carrying amount as of the balance sheet date of known and estimated obligations associated with exit from or disposal of business activities or restructurings pursuant to a duly authorized plan, which are expected to be paid in the next twelve months or in the normal operating cycle if longer. Costs of such activities include those for one-time termination benefits, termination of an operating lease or other contract, consolidating or closing facilities, relocating employees, and costs associated with an ongoing benefit arrangement, but excludes costs associated with the retirement of a long-lived asset. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Staff Accounting Bulletin (SAB) -Number Topic 5 -Section P -Subsection 4 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 420 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=6394359&loc=d3e17939-110869 + Details
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