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Commitments and Contingencies (Narrative) (Details) - USD ($) $ in Millions | 12 Months Ended |
--- | --- | ---
Dec. 27, 2017 | Dec. 28, 2016
Guarantor Obligations [Line Items] |  |
Loan amounts outstanding under the loan pools | $ 5.1 | $ 7.9
Maximum payments guaranteed | 1.1 |
Liabilities included as a component of other noncurrent liabilities and deferred credits | $ 0.1 | $ 0.1
Minimum [Member] |  |
Guarantor Obligations [Line Items] |  |
Guarantor obligations, term | 1 |
Maximum [Member] |  |
Guarantor Obligations [Line Items] |  |
Guarantor obligations, term | 4 |

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- Definition Guarantor Obligations, Loans Payable of Franchisee + References No definition available. + Details
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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=82913245&loc=d3e12069-110248 + Details
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- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References No definition available. + Details
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- Definition Maximum potential amount of future payments (undiscounted) the guarantor could be required to make under the guarantee or each group of similar guarantees before reduction for potential recoveries under recourse or collateralization provisions. + 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 (b)(1) -URI http://asc.fasb.org/extlink&oid=82913245&loc=d3e12069-110248 + Details
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- Definition Describe the approximate term of 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 (a) -URI http://asc.fasb.org/extlink&oid=82913245&loc=d3e12069-110248 + Details
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