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Operating (Gains), Losses and Other Charges, Net (Details) (USD $)
 12 Months Ended
Dec. 26, 2012
Dec. 28, 2011
Dec. 29, 2010
Operating (gains), losses and other charges, net [Abstract]      
Gains on sales of assets and other, net $ (7,090,000) $ (3,187,000) $ (9,481,000)
Restructuring charges and exit costs 3,912,000 1,234,000 4,162,000
Impairment charges 3,660,000 4,055,000 375,000
Operating (gains), losses and other charges, net 482,000 2,102,000 (4,944,000)
Restructuring charges and exit costs [Abstract]      
Exit costs 1,926,000 [1] 848,000 [1] 1,247,000
Severance and other restructuring charges 1,986,000 386,000 2,915,000
Total restructuring charges and exit costs 3,912,000 1,234,000 4,162,000
Components of change in accrued exit cost liabilities [Roll Forward]      
Balance, beginning of year 3,863,000 4,948,000  
Exit costs 1,926,000 [1] 848,000 [1] 1,247,000
Payments, net of sublease receipts (2,227,000) (2,200,000)  
Reclassification of certain lease liabilities, net 171,000 (166,000)  
Interest accretion 328,000 433,000  
Balance, end of year 4,061,000 3,863,000 4,948,000
Less current portion included in other current liabilities 1,361,000 1,116,000  
Long-term portion included in other noncurrent liabilities 2,700,000 2,747,000  
Estimated net cash payments related to exit cost liabilities [Abstract]      
2013 1,551,000    
2014 1,070,000    
2015 380,000    
2016 321,000    
2017 323,000    
Thereafter 1,325,000    
Total 4,970,000    
Less imputed interest 909,000    
Present value of exit cost liabilities 4,061,000    
Existing sublease arrangements 1,800,000    
Properties expected to enter into sublease arrangements in the future 3,300,000    
Accrued severance and other restructuring charges $ 500,000 $ 100,000  
[1] (1)Included as a component of operating (gains), losses and other charges, net.