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Long-term Debt and Obligations Under Capital Leases (Details) (USD $)
1 Months Ended 6 Months Ended
Aug. 31, 2011
Jun. 26, 2012
Dec. 27, 2011
Aug. 12, 2011
Long-term Debt and Obligations Under Capital Leases        
Long-term debt and capital lease obligations   $ 51,758,000 $ 61,905,000  
Less current maturities   321,000 304,000  
Long-term debt and capital lease obligations, excluding current maturities   51,437,000 61,601,000  
Installment loans, due 2012 - 2020
       
Long-term Debt and Obligations Under Capital Leases        
Long-term debt and capital lease obligations   1,579,000 1,679,000  
Weighted-average interest rate (as a percent)   10.57% 10.57%  
Obligations under capital leases
       
Long-term Debt and Obligations Under Capital Leases        
Long-term debt and capital lease obligations   179,000 226,000  
Revolver
       
Long-term Debt and Obligations Under Capital Leases        
Long-term debt and capital lease obligations   50,000,000 60,000,000  
Weighted-average interest rate (as a percent)   3.96% 3.20%  
Revolving credit facility, maximum borrowing capacity       200,000,000
Revolving credit facility term 5 years      
Revolving credit facility, remaining borrowing capacity   145,800,000    
Letters of credit outstanding   $ 4,200,000    
Revolving credit facility, fixed charge coverage ratio   2.00    
Revolving credit facility, leverage ratio   3.00    
Debt instrument condition for additional borrowing of secured debt, based on percentage of consolidated tangible net worth (as a percent)   20.00%    
Revolver | Minimum
       
Long-term Debt and Obligations Under Capital Leases        
Percentage of commitment fee on unused credit facility   0.15%    
Revolver | Maximum
       
Long-term Debt and Obligations Under Capital Leases        
Percentage of commitment fee on unused credit facility   0.35%    
Revolver | LIBOR | Minimum
       
Long-term Debt and Obligations Under Capital Leases        
Interest rate added to base rate (as a percent)   0.875%    
Revolver | LIBOR | Maximum
       
Long-term Debt and Obligations Under Capital Leases        
Interest rate added to base rate (as a percent)   1.875%    
Revolver | Eurodollar
       
Long-term Debt and Obligations Under Capital Leases        
Interest rate added to base rate (as a percent)   1.00%    
Revolver | Prime or Federal Funds
       
Long-term Debt and Obligations Under Capital Leases        
Interest rate added to base rate (as a percent)   0.50%    
Previous credit facility
       
Long-term Debt and Obligations Under Capital Leases        
Revolving credit facility term 5 years