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Long-term Debt and Obligations Under Capital Lease (Details)
$ in Thousands
12 Months Ended
Aug. 07, 2017
USD ($)
Dec. 27, 2016
restaurant
Dec. 25, 2018
USD ($)
Dec. 26, 2017
USD ($)
Long-term debt        
Long-term debt and capital lease obligations     $ 2,081 $ 51,990
Less current maturities       9
Long-term debt and capital lease obligations, excluding current maturities     2,081 51,981
Long-term debt        
Number of restaurant locations lease amended qualifies as capital lease | restaurant   1    
Obligation under capital lease        
Long-term debt        
Long-term debt and capital lease obligations     $ 2,081 1,990
Revolver        
Long-term debt        
Long-term debt and capital lease obligations       $ 50,000
Revolving Credit Facility        
Revolving credit facility, maximum borrowing capacity $ 200,000      
Revolving credit facility contingent increase in maximum borrowing capacity $ 200,000      
Weighted-average interest rate (as a percent)     3.81% 2.37%
Revolving credit facility, remaining borrowing capacity     $ 191,600  
Letters of credit outstanding     $ 8,400  
Debt instrument condition for additional borrowing of secured debt, based on percentage of consolidated tangible net worth 20.00%      
Revolver | Minimum        
Revolving Credit Facility        
Percentage of commitment fee on unused credit facility 0.125%      
Revolving credit facility, fixed charge coverage ratio 2.00      
Threshold for aggregate secured indebtedness $ 125,000      
Revolver | Maximum        
Revolving Credit Facility        
Percentage of commitment fee on unused credit facility 0.30%      
Revolving credit facility, leverage ratio 3.00      
Revolver | LIBOR | Minimum        
Revolving Credit Facility        
Interest rate added to base rate (as a percent) 0.875%      
Revolver | LIBOR | Maximum        
Revolving Credit Facility        
Interest rate added to base rate (as a percent) 1.875%      
Revolver | Federal Reserve Bank of New York        
Revolving Credit Facility        
Interest rate added to base rate (as a percent) 0.50%      
Revolver | Adjusted Eurodollar Rate        
Revolving Credit Facility        
Interest rate added to base rate (as a percent) 1.00%      
Interest period 1 month