Related Party Transactions - Franchisees (Details)			12 Months Ended
	Jun. 11, 2019 USD ($) shares	May 27, 2019 USD ($) restaurant	Dec. 31, 2020 USD ($)	Dec. 31, 2020 CAD ($)	Dec. 27, 2020
Related party transactions
Related Party Restricted Stock Units Shares Issued | shares	87,136
Mr. Shaquille O'Neal
Related party transactions
Cash payments	$ 4,125,000
Period of related party agreement	3 years
Period of extension of agreement					1 year
Number of restaurants included in joint venture agreement | restaurant		9
Ownership percentage of joint venture by Company (as a percent)		70.00%
Ownership percentage of joint venture by Partner (as a percent)		30.00%
The amount contributed to joint venture by Partner		$ 840,000
Papa John's Foundation for Building Community
Related party transactions
The amount of donation for every pizza sold in the United States of America			$ 1
The amount of donation for every pizza sold in Canada.				$ 1