Other Expense (Income) (Details) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 28, 2021 USD ($) restaurant transaction	Jun. 28, 2020 USD ($)	Jun. 28, 2021 USD ($)	Jun. 28, 2020 USD ($) transaction restaurant
Other Income and Expenses [Abstract]
Other Income	$ (715)		$ (942)	$ 1,947
Number Of Restaurants Subject To Insurance Recovery | restaurant	4			4
Gain on sale-leaseback transactions	$ 800		0	$ (567)
Property, Plant and Equipment, Disposals	100		$ 900	200
Other Expenses		$ (2,000)		(1,900)
Gain on Business Interruption Insurance Recovery	$ (1,300)			$ (1,600)
Number Of Sale-leaseback Transactions In Gain Position | transaction	3			10