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Long-term Debt and Obligations Under Capital Leases (Details) - USD ($)
$ in Thousands
Aug. 07, 2017
Mar. 27, 2018
Dec. 26, 2017
Long-term debt      
Long-term debt and capital lease obligations   $ 51,988 $ 51,990
Less current maturities   9 9
Long-term debt and capital lease obligations, excluding current maturities   51,979 51,981
Maturities of long-term debt      
Long-term debt and capital lease obligations   51,988 51,990
Obligation under capital lease      
Long-term debt      
Long-term debt and capital lease obligations   1,988 1,990
Maturities of long-term debt      
Long-term debt and capital lease obligations   1,988 1,990
Revolver      
Long-term debt      
Long-term debt and capital lease obligations   50,000 50,000
Maturities of long-term debt      
Long-term debt and capital lease obligations   $ 50,000 $ 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)   2.66% 2.37%
Revolving credit facility, amount outstanding   $ 50,000  
Revolving credit facility, remaining borrowing capacity   142,500  
Letters of credit outstanding   $ 7,500  
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      
Revolving Credit Facility      
Percentage of commitment fee on unused credit facility 0.125%    
Revolving credit facility, fixed charge coverage ratio 2.00    
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