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Significant Accounting Policies - Noncontrolling Interest and Joint Ventures (Details)
$ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2018
USD ($)
restaurant
entity
Apr. 01, 2018
entity
Sep. 24, 2017
USD ($)
restaurant
Sep. 30, 2018
USD ($)
restaurant
Sep. 24, 2017
USD ($)
restaurant
Jan. 01, 2018
entity
Income Amounts Attributable to Noncontrolling Interest, Disclosures            
Total income before income taxes $ (19,953)   $ 30,949 $ 22,114 $ 108,278  
Joint ventures            
Noncontrolling Interests            
Number of Joint Ventures Having Noncontrolling Interests | entity           5
Number of joint ventures divested | entity 1 1        
Number of Restaurants | restaurant 183   222 183 222  
Income Amounts Attributable to Noncontrolling Interest, Disclosures            
Papa John's International, Inc. $ 1,512   $ 1,469 $ 4,384 $ 6,172  
Noncontrolling interests 439   852 1,956 3,767  
Total income before income taxes $ 1,951   $ 2,321 $ 6,340 $ 9,939