Annual report pursuant to Section 13 and 15(d)

Recent Accounting Pronouncements (Details)

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Recent Accounting Pronouncements (Details)
$ in Thousands
12 Months Ended
Dec. 31, 2017
USD ($)
fund
Dec. 25, 2016
USD ($)
Dec. 27, 2015
USD ($)
New Accounting Pronouncements or Change in Accounting Principle [Line Items]      
Number of marketing and national media funds to which the entity and franchisees must contribute a minimum percentage of revenue | fund 2    
Franchise royalties and fees $ 11,044 $ 11,209 $ 12,526
Selling, general, and administrative expenses 150,019 137,887 $ 146,656
ASU 2014-09 | Pro Forma      
New Accounting Pronouncements or Change in Accounting Principle [Line Items]      
Franchise royalties and fees 17,681 17,955  
Selling, general, and administrative expenses 156,656 144,633  
Calculated under Revenue Guidance in Effect before Topic 606 | ASU 2014-09 | Pro Forma      
New Accounting Pronouncements or Change in Accounting Principle [Line Items]      
Franchise royalties and fees 11,044 11,209  
Selling, general, and administrative expenses 150,019 137,887  
Difference between Revenue Guidance in Effect before and after Topic 606 | ASU 2014-09 | Pro Forma      
New Accounting Pronouncements or Change in Accounting Principle [Line Items]      
Franchise royalties and fees 6,637 6,746  
Selling, general, and administrative expenses $ 6,637 $ 6,746