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Summary of Significant Accounting Policies - Revenue Recognition (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 29, 2020
Dec. 31, 2019
Jan. 02, 2018
Revenue Recognition      
Gift card breakage period 3 years    
Revenue recognized $ 7.6 $ 8.0 $ 8.0
Promotional programs      
Revenue Recognition      
Deferred revenue 11.6 7.9  
Deferred revenue recognized $ 11.2 $ 7.3  
Minimum      
Revenue Recognition      
Revenue recognition agreement term 1 year    
Revenue recognition for development and site fees over the life of the applicable licensee agreements (in years) 8 years    
Maximum      
Revenue Recognition      
Revenue recognition agreement term 3 years    
Revenue recognition for development and site fees over the life of the applicable licensee agreements (in years) 30 years