Revenues - Disaggregation of Revenues (Details) $ in Thousands	3 Months Ended
	Mar. 25, 2020 USD ($) segment sale_channel	Mar. 27, 2019 USD ($)
Revenue from Contract with Customer [Abstract]
Number of sales channels | sale_channel	2
Number of segments | segment	1
Disaggregation of Revenue [Line Items]
Total operating revenue	$ 96,695	$ 151,411
Company restaurant sales
Disaggregation of Revenue [Line Items]
Total operating revenue	42,291	98,545
Royalties
Disaggregation of Revenue [Line Items]
Total operating revenue	23,847	25,240
Advertising revenue
Disaggregation of Revenue [Line Items]
Total operating revenue	17,526	18,942
Initial and other fees
Disaggregation of Revenue [Line Items]
Total operating revenue	1,697	1,139
Occupancy revenue
Disaggregation of Revenue [Line Items]
Total operating revenue	11,334	7,545
Franchise and license revenue
Disaggregation of Revenue [Line Items]
Total operating revenue	$ 54,404	$ 52,866