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Summary of Significant Accounting Policies Summary of Significant Accounting Policies (Advertising Costs) (Details) - USD ($) $ in Millions | 12 Months Ended
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Dec. 26, 2018 | Dec. 27, 2017 | Dec. 28, 2016
Franchisor Disclosure |  |  |
Advertising expense | $ 15.0 | $ 14.3 | $ 13.1
Advertising contributions from franchisees |  | 79.7 | 76.5
Franchised Units [Member] |  |  |
Franchisor Disclosure |  |  |
Advertising expense | $ 78.3 | $ 1.9 | $ 1.9

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- Definition Amount charged to advertising expense for the period, which are expenses incurred with the objective of increasing revenue for a specified brand, product or product line. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 720 -SubTopic 35 -Section 50 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=6420018&loc=d3e36677-107848 + Details
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