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Operating (Gains), Losses and Other Charges, Net (Details) (USD $)
 3 Months Ended 6 Months Ended
Jun. 27, 2012
Jun. 29, 2011
Jun. 27, 2012
Jun. 29, 2011
Dec. 28, 2011
Operating (gains), losses and other charges, net [Abstract]          
Gains on sales of assets and other, net $ (4,908,000) $ (879,000) $ (6,863,000) $ (1,875,000)  
Restructuring charges and exit costs 882,000 402,000 2,149,000 869,000  
Impairment charges 17,000 58,000 540,000 58,000  
Operating (gains), losses and other charges, net (4,009,000) (419,000) (4,174,000) (948,000)  
Restructuring charges and exit costs [Abstract]          
Exit costs 327,000 251,000 906,000 [1] 613,000  
Severance and other restructuring charges 555,000 151,000 1,243,000 256,000  
Total restructuring and exit costs 882,000 402,000 2,149,000 869,000  
Components of change in accrued exit cost liabilities [Roll Forward]          
Balance at December 28, 2011     3,863,000    
Exit costs 327,000 251,000 906,000 [1] 613,000  
Payments, net of sublease receipts     (1,045,000)    
Reclassification of certain lease liabilities, net     77,000    
Interest accretion     172,000    
Balance at June 27, 2012 3,973,000   3,973,000    
Less current portion included in other current liabilities 1,318,000   1,318,000    
Long-term portion included in other noncurrent liabilities 2,655,000   2,655,000    
Estimated net cash payments related to exit cost liabilities [Abstract]          
Remainder of 2012 975,000   975,000    
2013 1,053,000   1,053,000    
2014 771,000   771,000    
2015 394,000   394,000    
2016 275,000   275,000    
Thereafter 1,559,000   1,559,000    
Total 5,027,000   5,027,000    
Less imputed interest 1,054,000   1,054,000    
Present value of exit cost liabilities 3,973,000   3,973,000    
Accrued severance and other restructuring charges $ 1,000,000   $ 1,000,000   $ 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