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Revenues Contract Balances (Details) - USD ($)
$ in Thousands
9 Months Ended
Sep. 26, 2018
Dec. 28, 2017
Dec. 27, 2017
Revenues [Abstract]      
Balance, December 27, 2017 $ 1,643    
Cumulative effect adjustment recognized upon adoption of Topic 606   $ 20,976 $ (15,446)
Fees received from franchisees 795    
Revenue recognized [1] 2,628    
Balance, September 26, 2018 20,786    
Less current portion included in other current liabilities 2,168    
Deferred franchise revenue included in other noncurrent liabilities 18,618    
Revenue recognized that was included in either the deferred franchise revenue balance as of December 27, 2017 or the cumulative effect adjustment 2,600    
Gift card liabilities 4,129   $ 6,480
Revenue recognized from gift card redemptions $ 1,400    
[1] Of this amount $2.6 million was included in either the deferred franchise revenue balance as of December 27, 2017 or the cumulative effect adjustment.