Summary of Refranchsing and Franchise Acquisitions Summary of refranchising (Details) $ in Thousands	12 Months Ended
	Dec. 28, 2021 USD ($) restaurants	Dec. 29, 2020 USD ($) restaurants	Dec. 31, 2019 USD ($) restaurants
Other Industries [Abstract]
Assets held for sale	$ 0	$ 1,495
Company-operated restaurants sold to franchisees | restaurants	0	6	31
Proceeds from Divestiture of Businesses	$ 0	$ 2,558	$ 7,310
Net assets sold (primarily furniture, fixtures and equipment)	0	(2,086)	(4,952)
Goodwill related to the company-operated restaurants sold to franchisees	0	(1,196)	(6,078)
Allocation to Deferred Franchise Fees	0	(193)	(771)
(Unfavorable)/favorable lease assets/liabilities	0	220	(50)
Gain (Loss) on Termination of Lease	0	40	0
Other costs related to the sale of company-operated restaurants	0	0	(123)
Gain on sale of company-operated restaurants	0	(657)	(4,664)
Favorable lease assets	8,508	9,754
Land Available-for-sale	0	561
Real Estate Held-for-sale	$ 0	934
Assets Held For Sale, Assets Sold		700	$ 2,100
Assets Held For Sale, Fair Value Adjustment		$ 600