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Update to Significant Accounting Policies - Noncontrolling Interest and Joint Ventures (Details)
$ in Thousands
3 Months Ended
Mar. 31, 2019
USD ($)
restaurant
entity
Apr. 01, 2018
USD ($)
Noncontrolling Interests    
Number of Joint Ventures Having Noncontrolling Interests | entity 3  
Income Amounts Attributable to Noncontrolling Interest, Disclosures    
Total income before income taxes $ (767) $ 23,064
Joint ventures    
Noncontrolling Interests    
Number of Restaurants | restaurant 183  
Income Amounts Attributable to Noncontrolling Interest, Disclosures    
Papa John's International, Inc. $ 464 1,295
Noncontrolling interests 133 643
Total income before income taxes $ 597 $ 1,938