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Commitments and Contingencies (Details) (USD $) In Millions, unless otherwise specified | Oct. 26, 2013 | Jul. 27, 2013
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Credit Agreement, December 3, 2012, Maturing December 2017 | Revolving Credit Facility | Standby Letters of Credit |  |
Loss Contingencies [Line Items] |  |
Letters of credit outstanding amount | $ 49.7 |
Prior Credit Agreement Which Has Been Terminated or Replaced | Revolving Credit Facility | Standby Letters of Credit |  |
Loss Contingencies [Line Items] |  |
Letters of credit outstanding amount |  | 46.7
Performance Guarantee and Surety Bond |  |
Loss Contingencies [Line Items] |  |
Outstanding performance and other surety contract bonds | $ 435.3 | $ 446.5

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- Definition The current carrying amount of the liability for the freestanding or embedded guarantor's obligations under the guarantee or each group of similar guarantees. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 460 -SubTopic 10 -Section 50 -Paragraph 4 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=6851643&loc=d3e12069-110248 + Details
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Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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- Definition The total amount of the contingent obligation under letters of credit outstanding as of the reporting date. + References No definition available. + Details
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Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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- Details
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Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration