Revenue Recognition - Contract Balances (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 27, 2021	Jun. 28, 2020	Jun. 27, 2021	Jun. 28, 2020	Mar. 28, 2021	Dec. 27, 2020	Mar. 29, 2020	Dec. 29, 2019
Revenue disaggregation
Cumulative effect of adoption of Topic 606	$ (147,898)	$ (291,848)	$ (147,898)	$ (291,848)	$ (240,100)	$ (266,939)	$ (326,300)	$ (316,656)
Revenue recognized related to deferred revenue and customer loyalty program	9,000	$ 8,400	18,200	$ 16,300
Contract liabilities	33,553		33,553			33,254
Change			299
Contract assets	5,600		5,600			5,100
Amortization expense related to contract assets	600		1,400
Franchise fees and unredeemed gift card liabilities
Revenue disaggregation
Contract liabilities	18,619		18,619			19,890
Change			(1,271)
Customer loyalty program obligations
Revenue disaggregation
Contract liabilities	$ 14,934		14,934			$ 13,364
Change			$ 1,570