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Revenue Recognition - Contract Balances (Details) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Sep. 27, 2020
Sep. 29, 2019
Sep. 27, 2020
Sep. 29, 2019
Dec. 29, 2019
Revenue disaggregation          
Revenue recognized related to deferred revenue and customer loyalty program $ 8,400 $ 9,000 $ 24,700 $ 24,700  
Contract liabilities 31,387   31,387   $ 32,395
Change     (1,008)    
Contract assets 4,800   4,800   6,000
Amortization expense related to contract assets 900 $ 2,500 900 $ 2,500  
Franchise fees and unredeemed gift cards          
Revenue disaggregation          
Contract liabilities 18,610   18,610   20,346
Change     (1,736)    
Customer loyalty program          
Revenue disaggregation          
Contract liabilities $ 12,777   12,777   $ 12,049
Change     $ 728