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Leases (Details) (USD $)
 12 Months Ended
Dec. 27, 2011
Dec. 28, 2010
Schedule of future minimum lease payments required for capital leases    
2012 $ 117,000  
2013 117,000  
2014 20,000  
Total 254,000  
Less amount representing interest of 10.9% 28,000  
Present value of minimum capital lease payments 226,000  
Less current maturities of obligations under capital leases 98,000  
Obligations under capital leases, excluding current maturities 128,000  
Percentage of interest under capital lease (as a percent) 10.90%  
Schedule of future minimum lease payments required for operating leases that have initial or remaining noncancelable terms in excess of one year    
2012 22,999,000  
2013 22,721,000  
2014 22,127,000  
2015 19,853,000  
2016 18,336,000  
Thereafter 93,502,000  
Total 199,538,000  
Leases    
Capitalized lease assets, cost 800,000 900,000
Accumulated amortization of property held under capital leases $ 400,000 $ 400,000