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Summary of Significant Accounting Policies (Advertising Costs) (Details) - USD ($)
$ in Thousands
3 Months Ended 12 Months Ended
Dec. 25, 2019
Sep. 25, 2019
Jun. 26, 2019
Mar. 27, 2019
Dec. 26, 2018
Sep. 26, 2018
Jun. 27, 2018
Mar. 28, 2018
Dec. 25, 2019
Dec. 26, 2018
Dec. 27, 2017
Franchisor Disclosure [Line Items]                      
Advertising expense                 $ 11,200 $ 15,000 $ 14,300
Revenue $ 113,836 $ 124,258 $ 151,884 $ 151,411 $ 159,549 $ 158,023 $ 157,334 $ 155,273 541,389 630,179 529,169
Advertising contributions from franchisees                     79,700
Advertising revenue                      
Franchisor Disclosure [Line Items]                      
Revenue                 $ 81,144 $ 78,308 $ 0