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Operating (Gains), Losses and Other Charges, Net (Details) (USD $)
 3 Months Ended 9 Months Ended
Sep. 25, 2013
Sep. 26, 2012
Sep. 25, 2013
Sep. 26, 2012
Dec. 26, 2012
Operating (gains), losses and other charges, net [Abstract]          
(Gains) losses on sales of assets and other, net $ (68,000) $ 91,000 $ (83,000) $ (6,772,000)  
Restructuring charges and exit costs 229,000 821,000 1,005,000 2,970,000  
Impairment charges 0 2,468,000 857,000 3,008,000  
Operating (gains), losses and other charges, net 161,000 3,380,000 1,779,000 (794,000)  
Restructuring charges and exit costs [Abstract]          
Exit costs 198,000 233,000 435,000 [1] 1,139,000  
Severance and other restructuring charges 31,000 588,000 570,000 1,831,000  
Total restructuring charges and exit costs 229,000 821,000 1,005,000 2,970,000  
Components of change in accrued exit cost liabilities [Roll Forward]          
Balance at December 26, 2012     4,061,000    
Exit costs 198,000 233,000 435,000 [1] 1,139,000  
Payments, net of sublease receipts     (1,248,000)    
Interest accretion     195,000    
Balance, September 25, 2013 3,443,000   3,443,000    
Less current portion included in other current liabilities 1,228,000   1,228,000    
Long-term portion included in other noncurrent liabilities 2,215,000   2,215,000    
Estimated net cash payments related to exit cost liabilities [Abstract]          
Remainder of 2013 270,000   270,000    
2014 1,319,000   1,319,000    
2015 545,000   545,000    
2016 320,000   320,000    
2017 322,000   322,000    
Thereafter 1,338,000   1,338,000    
Total 4,114,000   4,114,000    
Less imputed interest 671,000   671,000    
Present value of exit cost liabilities 3,443,000   3,443,000    
Accrued severance and other restructuring charges 100,000   100,000   500,000
Period of accrued severance and other restructuring charges, maximum     12 months    
Impairment charges $ 0 $ 2,468,000 $ 857,000 $ 3,008,000  
[1] (1)Included as a component of operating (gains), losses and other charges, net.