Summary of Refranchising and Franchise Acquisitions - Summary of Refranchising (Details) $ in Thousands	3 Months Ended
	Mar. 24, 2020 USD ($) restaurants	Mar. 26, 2019 USD ($) franchise restaurants	Dec. 31, 2019 USD ($)
Franchise Acquisitions [Abstract]
Company-operated restaurants sold to franchisees | restaurants	5	13
Proceeds from the sale of company-operated restaurants, net of selling costs	$ 1,219	$ 2,090
Net assets sold (primarily furniture, fixtures and equipment)	(731)	(2,051)
Allocation to deferred franchise fees	(159)	(281)
Sublease assets, net	220	260
Loss on sale of company-operated restaurants	(647)	(65)
Goodwill, Written off Related to Sale of Business Unit	1,196	83
Assets Held For Sale, Assets Sold	690
Assets Held For Sale, Fair Value Adjustment	580
Goodwill, Acquired During Period	2,672
Property, Plant and Equipment, Additions	578
Business combination recognized identifiable assets acquired and liabilities assumed, operating lease right of use assets		858
Business combination recognized identifiable assets acquired and liabilities assumed, operating lease liabilities		$ 858
Below Market Lease, Acquired	130
Business Combination, Consideration Transferred	3,120
Significant Changes, Franchises Purchased During Period | franchise		3
Other property and equipment held for sale	0		$ 4,025
Goodwill	0		4,386
Assets Held-for-sale, Not Part of Disposal Group, Current, Total	$ 0		$ 8,411