Leases - Cost (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 28, 2021	Jun. 28, 2020	Jun. 28, 2021	Jun. 28, 2020
Loans and Leases Receivable Disclosure [Line Items]
Variable lease cost	$ 4,907	$ 3,599	$ 9,505	$ 7,704
Sublease income	(33)	(106)	(59)	(228)
Amortization of right-of-use assets	177	437	309	882
Interest on lease liabilities	28	36	51	82
Total lease cost	31,020	29,624	61,745	59,667
Restaurant Rent Expense [Member]
Loans and Leases Receivable Disclosure [Line Items]
Operating lease cost	25,717	25,491	51,459	50,962
General and Administrative Expense [Member]
Loans and Leases Receivable Disclosure [Line Items]
Operating lease cost	$ 224	$ 167	$ 480	$ 265