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Revenues - (Disaggregation of Revenues) (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 27, 2023
Dec. 28, 2022
Dec. 29, 2021
Disaggregation of Revenue [Line Items]      
Total operating revenue $ 463,922 $ 456,429 $ 398,174
Company restaurant sales      
Disaggregation of Revenue [Line Items]      
Total operating revenue 215,532 199,753 175,017
Royalties      
Disaggregation of Revenue [Line Items]      
Total operating revenue 120,131 113,891 103,425
Advertising revenue      
Disaggregation of Revenue [Line Items]      
Total operating revenue 78,494 75,926 69,957
Initial and other fees      
Disaggregation of Revenue [Line Items]      
Total operating revenue 13,882 28,262 8,009
Occupancy revenue       
Disaggregation of Revenue [Line Items]      
Total operating revenue 35,883 38,597 41,766
Franchise and license revenue      
Disaggregation of Revenue [Line Items]      
Total operating revenue $ 248,390 $ 256,676 $ 223,157