Other Expense (Income) (Details) $ in Thousands	3 Months Ended		9 Months Ended
	Oct. 03, 2021 USD ($) restaurant transaction	Sep. 27, 2020 USD ($)	Oct. 03, 2021 USD ($)	Sep. 27, 2020 USD ($) transaction restaurant
Other Income and Expenses [Abstract]
Other Income	$ 1,053		$ 111	$ 1,432
Number Of Restaurants Subject To Insurance Recovery | restaurant	2			4
Gain on sale-leaseback transactions	$ (400)		(17)	$ (226)
Property, Plant and Equipment, Disposals	300		$ 900	500
Other Expenses		$ 500		1,400
Gain on Business Interruption Insurance Recovery	$ (200)			$ (1,700)
Number Of Sale-leaseback Transactions In Gain Position | transaction	1			11