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Long-term Debt and Obligations Under Capital Leases (Details) (USD $)
6 Months Ended
Jun. 28, 2011
Dec. 28, 2010
Jun. 28, 2011
Installment loans, due 2011 - 2020
Dec. 28, 2010
Installment loans, due 2011 - 2020
Dec. 29, 2009
Installment loans, due 2011 - 2020
Jun. 28, 2011
Obligations under capital leases
Dec. 28, 2010
Obligations under capital leases
Jun. 28, 2011
Revolver
Dec. 28, 2010
Revolver
Long-term Debt and Obligations Under Capital Leases                  
Long-term debt $ 52,046,000 $ 52,180,000 $ 1,774,000 $ 1,865,000   $ 272,000 $ 315,000 $ 50,000,000 $ 50,000,000
Less current maturities 289,000 274,000              
Long-term debt and capital lease obligations 51,757,000 51,906,000              
Weighted-average interest rate (as a percent)     10.57%   10.57%     3.59% 3.59%
Revolving credit facility, remaining borrowing capacity               196,200,000  
Letters of credit outstanding               $ 3,800,000  
Revolving credit facility, minimum fixed charge coverage ratio               2.00 to 1.00  
Revolving credit facility, maximum leverage ratio               3.00 to 1.00  
Debt instrument condition for additional borrowing of secured debt, based on percentage of consolidated tangible net worth (as a percent)               20.00%