Acquisition (Details) $ in Thousands			3 Months Ended		6 Months Ended
	Jun. 23, 2021 USD ($) restaurant	Jun. 17, 2021 USD ($) restaurant	Jun. 28, 2021 USD ($)	Jun. 28, 2020 USD ($)	Jun. 28, 2021 USD ($) restaurant	Jun. 28, 2020 USD ($)	Jan. 04, 2022 USD ($)	Jan. 03, 2021 USD ($)
Business Acquisition [Line Items]
Number of Restaurants Acquired	5	14			19
Payments to Acquire Businesses, Gross	$ 3,216	$ 27,603			$ 30,819
Business acquisitions, purchase price					30,819	$ 0
Proceeds from sale-leaseback transactions					0	18,859
Business Acquisition, Goodwill, Expected Tax Deductible Amount			$ 600		600
Restaurant sales			424,541	$ 368,418	814,534	719,936
Goodwill			123,248		$ 123,248			$ 122,619
Number Of Businesses Acquired, Fee Owned | restaurant	1	12			13
Sale Leaseback Transaction, Net Book Value			$ 20,100		$ 20,100
Sale Leaseback Transaction, Number Of Restaurants Expected To Be Sold | restaurant					12
2021 Acquisitions
Business Acquisition [Line Items]
Restaurant sales					$ 1,000
Goodwill							$ 629
Business Acquisition, Pro Forma, General and Administrative Exepnses						$ 300