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Long-term Debt and Obligations Under Capital Leases (Details)
$ in Thousands
3 Months Ended 12 Months Ended
Mar. 28, 2017
USD ($)
Dec. 27, 2016
USD ($)
restaurant
Long-term Debt    
Long-term debt and capital lease obligations $ 52,508 $ 52,548
Less current maturities 172 167
Long-term debt and capital lease obligations, excluding current maturities 52,336 $ 52,381
Number of restaurant locations lease amended qualifies as capital lease | restaurant   1
Installment loan, due 2020    
Long-term Debt    
Long-term debt and capital lease obligations $ 512 $ 550
Interest rate (as a percent) 10.46% 10.46%
Obligation under capital lease    
Long-term Debt    
Long-term debt and capital lease obligations $ 1,996 $ 1,998
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  
Revolving credit facility maximum borrowing capacity after contingent increase $ 400,000  
Weighted-average interest rate (as a percent) 1.82% 1.57%
Revolving credit facility, amount outstanding $ 50,000  
Revolving credit facility, remaining borrowing capacity 142,900  
Letters of credit outstanding $ 7,100  
Debt instrument condition for additional borrowing of secured debt, based on percentage of consolidated tangible net worth 15.00%  
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 one-month Eurodollar Rate    
Long-term Debt    
Interest rate added to base rate (as a percent) 1.00%