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Significant Accounting Policies - Fiscal Year, Revenue Recognition and Advertising Costs (Details) - USD ($)
$ in Thousands
3 Months Ended 12 Months Ended
Dec. 30, 2018
Dec. 30, 2018
Dec. 31, 2017
Dec. 25, 2016
Length of fiscal year   364 days 371 days 364 days
Term of franchise agreement   10 years    
Advertising and related costs   $ 60,800 $ 72,300 $ 70,900
PJMF        
Contributions for additional advertising   $ 10,000    
Papa Dough Rewards        
Expiration window of rewards program 6 months      
Minimum        
Amortization term of equipment incentives   3 years    
Maximum        
Amortization term of equipment incentives   5 years