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Revenues - Narrative (Details) - USD ($)
$ in Thousands
 9 Months Ended
Dec. 25, 2019
Sep. 23, 2020
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]    
Liability balance   $ 2,112
Deferred revenue recognized $ 2,400  
Gift Card Redemption    
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]    
Liability balance $ 6,500 4,800
Deferred revenue recognized   $ 300
Minimum | Deferred Franchise Revenue | Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2020-09-24    
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]    
Deferred franchise revenue expected to be recognized, period   10 years
Maximum | Deferred Franchise Revenue | Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2020-09-24    
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]    
Deferred franchise revenue expected to be recognized, period   20 years