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Operating (Gains), Losses and Other Charges, Net (Details) (USD $)
 3 Months Ended 9 Months Ended
Sep. 26, 2012
Sep. 28, 2011
Sep. 26, 2012
Sep. 28, 2011
Dec. 28, 2011
Operating (gains), losses and other charges, net [Abstract]          
Gains on sales of assets and other, net $ 91,000 $ (867,000) $ (6,772,000) $ (2,742,000)  
Restructuring charges and exit costs 821,000 490,000 2,970,000 1,359,000  
Impairment charges 2,468,000 2,168,000 3,008,000 2,226,000  
Operating (gains), losses and other charges, net 3,380,000 1,791,000 (794,000) 843,000  
Restructuring charges and exit costs [Abstract]          
Exit costs 233,000 465,000 1,139,000 [1] 1,078,000  
Severance and other restructuring charges 588,000 25,000 1,831,000 281,000  
Restructuring charges and exit costs 821,000 490,000 2,970,000 1,359,000  
Components of change in accrued exit cost liabilities [Roll Forward]          
Balance at December 28, 2011     3,863,000    
Exit costs 233,000 465,000 1,139,000 [1] 1,078,000  
Payments, net of sublease receipts     (1,500,000)    
Reclassification of certain lease liabilities, net     77,000    
Interest accretion     256,000    
Balance, September 26, 2012 3,835,000   3,835,000    
Less current portion included in other current liabilities 1,391,000   1,391,000    
Long-term portion included in other noncurrent liabilities 2,444,000   2,444,000    
Estimated net cash payments related to exit cost liabilities [Abstract]          
Remainder of 2012 834,000   834,000    
2013 1,077,000   1,077,000    
2014 803,000   803,000    
2015 332,000   332,000    
2016 275,000   275,000    
Thereafter 1,390,000   1,390,000    
Total 4,711,000   4,711,000    
Less imputed interest 876,000   876,000    
Present value of exit cost liabilities 3,835,000   3,835,000    
Accrued severance and other restructuring charges $ 500,000   $ 500,000   $ 100,000
Period of accrued severance and other restructuring charges, maximum     12 months    
[1] Included as a component of operating (gains), losses and other charges, net.