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Update to Significant Accounting Policies - Noncontrolling Interest and Joint Ventures (Details) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 27, 2020 USD ($) restaurant entity	Sep. 29, 2019 USD ($) restaurant entity	Sep. 27, 2020 USD ($) restaurant entity	Sep. 29, 2019 USD ($) restaurant entity
Noncontrolling Interests
Percentage of domestic restaurants franchised	80.00%		80.00%
Number of Joint Ventures Having Noncontrolling Interests | entity	4	4	4	4
Joint ventures
Noncontrolling Interests
Number of Restaurants | restaurant	192	192	192	192
Income Amounts Attributable to Noncontrolling Interest, Disclosures
Papa John's International, Inc.	$ 1,292	$ 213	$ 4,743	$ 1,385
Noncontrolling interests	689	(128)	2,576	327
Income (Loss) from Continuing Operations, Net of Tax, Including Portion Attributable to Noncontrolling Interest	$ 1,981	$ 85	$ 7,319	$ 1,712

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