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Significant Accounting Policies - Fiscal Year, Revenue Recognition and Advertising Costs (Details) - USD ($)
$ in Millions
9 Months Ended 12 Months Ended
Sep. 27, 2020
Dec. 26, 2021
Dec. 27, 2020
Dec. 29, 2019
Percentage of domestic restaurants franchised   80.00%    
Length of fiscal year   364 days 364 days 364 days
Franchisee royalty fee for new and existing franchised restaurants (as a percent)   5.00%    
Term of franchise agreement   10 years    
Advertising and related costs   $ 61.7 $ 56.7 $ 54.3
Interest income on franchisee loans   $ 1.9 $ 2.1 0.8
PJMF        
Contributions for additional advertising $ 15.0     $ 27.5
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