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Long-term Debt and Obligations Under Capital Leases (Details)
$ in Thousands
12 Months Ended
Aug. 07, 2017
USD ($)
Dec. 27, 2016
USD ($)
restaurant
Sep. 26, 2017
USD ($)
Long-term Debt      
Long-term debt and capital lease obligations   $ 52,548 $ 51,993
Less current maturities   167 9
Long-term debt and capital lease obligations, excluding current maturities   $ 52,381 51,984
Number of restaurant locations lease amended qualifies as capital lease | restaurant   1  
Installment loan      
Long-term Debt      
Long-term debt and capital lease obligations   $ 550  
Interest rate (as a percent)   10.46%  
Obligations under capital leases      
Long-term Debt      
Long-term debt and capital lease obligations   $ 1,998 1,993
Revolver      
Long-term Debt      
Long-term debt and capital lease obligations   $ 50,000 $ 50,000
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)   1.57% 2.11%
Revolving credit facility, amount outstanding     $ 50,000
Revolving credit facility, remaining borrowing capacity     142,900
Letters of credit outstanding     $ 7,100
Threshold for aggregate secured indebtedness $ 125,000    
Debt instrument condition for additional borrowing of secured debt, based on percentage of consolidated tangible net worth 20.00%    
Revolver | Minimum      
Long-term Debt      
Percentage of commitment fee on unused credit facility 0.125%    
Revolving credit facility, fixed charge coverage ratio 2.00    
Revolver | Maximum      
Long-term Debt      
Percentage of commitment fee on unused credit facility 0.30%    
Revolving credit facility, leverage ratio 3.00    
Revolver | LIBOR | Minimum      
Long-term Debt      
Interest rate added to base rate (as a percent) 0.875%    
Revolver | LIBOR | Maximum      
Long-term Debt      
Interest rate added to base rate (as a percent) 1.875%    
Revolver | Federal Funds      
Long-term Debt      
Interest rate added to base rate (as a percent) 0.50%    
Revolver | Adjusted Eurodollar Rate      
Long-term Debt      
Interest rate added to base rate (as a percent) 1.00%    
Interest period 1 month