Revenue from Contracts with Customers - Revenues Disaggregated by Revenue Source and Market (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 29, 2021	Dec. 30, 2020	Dec. 25, 2019
Disaggregation of Revenue [Line Items]
Total revenue	$ 454,363	$ 426,087	$ 442,330
Core Market
Disaggregation of Revenue [Line Items]
Total revenue	399,146	371,510	377,591
Non-Core Market
Disaggregation of Revenue [Line Items]
Total revenue	55,217	54,577	64,739
Company-operated restaurant revenue
Disaggregation of Revenue [Line Items]
Total revenue	394,733	374,064	391,112
Company-operated restaurant revenue | Core Market
Disaggregation of Revenue [Line Items]
Total revenue	371,067	346,662	351,624
Company-operated restaurant revenue | Non-Core Market
Disaggregation of Revenue [Line Items]
Total revenue	23,666	27,402	39,488
Franchise revenue
Disaggregation of Revenue [Line Items]
Total revenue	33,729	29,418	28,819
Franchise revenue | Core Market
Disaggregation of Revenue [Line Items]
Total revenue	16,062	14,216	14,918
Franchise revenue | Non-Core Market
Disaggregation of Revenue [Line Items]
Total revenue	17,667	15,202	13,901
Franchise advertising fee revenue
Disaggregation of Revenue [Line Items]
Total revenue	25,901	22,605	22,399
Franchise advertising fee revenue | Core Market
Disaggregation of Revenue [Line Items]
Total revenue	12,017	10,632	11,049
Franchise advertising fee revenue | Non-Core Market
Disaggregation of Revenue [Line Items]
Total revenue	$ 13,884	$ 11,973	$ 11,350