Revenue Recognition - Contract Balances (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 26, 2021	Sep. 27, 2020	Sep. 26, 2021	Sep. 27, 2020	Jun. 27, 2021	Dec. 27, 2020	Jun. 28, 2020	Dec. 29, 2019
Revenue disaggregation
Cumulative effect of adoption of Topic 606	$ (137,046)	$ (272,845)	$ (137,046)	$ (272,845)	$ (147,898)	$ (266,939)	$ (291,848)	$ (316,656)
Revenue recognized related to deferred revenue and customer loyalty program	9,200	$ 8,400	27,300	$ 24,700
Contract liabilities	33,088		33,088			33,254
Change			(166)
Contract assets	5,600		5,600			5,100
Amortization expense related to contract assets	800		2,200
Franchise fees and unredeemed gift card liabilities
Revenue disaggregation
Contract liabilities	17,949		17,949			19,890
Change			(1,941)
Customer loyalty program obligations
Revenue disaggregation
Contract liabilities	$ 15,139		15,139			$ 13,364
Change			$ 1,775