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Commitments and Contingencies (Details) - USD ($) $ in Millions | Jun. 25, 2016 | Dec. 26, 2015 | Jun. 27, 2015
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Commitments and Contingencies Disclosure [Abstract] |  |  |
Purchase Obligation, Due in Next Twelve Months | $ 0.0 |  |
Letters of Credit Outstanding, Amount | $ 50.5 | $ 48.7 | $ 57.4

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- References No definition available. + Details
Name: | us-gaap_CommitmentsAndContingenciesDisclosureAbstract
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Definition Amount of contractual obligation, including but not limited to, long-term debt, capital lease obligations, operating lease obligations, purchase obligations, and other commitments. + References No definition available. + Details
Name: | us-gaap_ContractualObligation
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
Name: | us-gaap_LettersOfCreditOutstandingAmount
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant