Acquisition (Details) $ in Thousands			3 Months Ended		9 Months Ended
	Jun. 23, 2021 USD ($) restaurant	Jun. 17, 2021 USD ($) restaurant	Oct. 03, 2021 USD ($)	Sep. 27, 2020 USD ($)	Oct. 03, 2021 USD ($) restaurant	Sep. 27, 2020 USD ($)	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					20,186	20,342
Business Acquisition, Goodwill, Expected Tax Deductible Amount			$ 1,400		1,400
Restaurant sales			421,703	$ 407,036	1,236,237	$ 1,126,972
Goodwill			123,971		$ 123,971		$ 122,619
Number Of Businesses Acquired, Fee Owned | restaurant	1	12			13
Sale Leaseback Transaction, Net Book Value			20,200		$ 20,200
Sale Leaseback Transaction, Number Of Restaurants Expected To Be Sold | restaurant					12
2021 Acquisitions
Business Acquisition [Line Items]
Restaurant sales			6,100		$ 7,100
Goodwill			1,352		1,352
Business Acquisition, Pro Forma, General and Administrative Exepnses			$ 100		$ 400