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Employee Benefit Plans (Components Of The Change In Unamortized Actuarial Losses, Net, Included In Accumulated Other Comprehensive Income) (Details) (USD $)
 12 Months Ended
Dec. 26, 2012
Dec. 28, 2011
Dec. 29, 2010
Components of the Change in Accumulated Other Comprehensive Income (Loss) [Roll Forward]      
Minimum pension liability adjustment $ 186,000 $ 5,614,000 $ 1,153,000
Accumulated other comprehensive income (losses) related to minimum pension liability adjustments, net of tax 25,000,000 24,800,000  
Accumulated other comprehensive income (losses) related to minimum pension liability adjustments, tax amount 3,800,000 3,600,000  
Pension Plan [Member]
      
Components of the Change in Accumulated Other Comprehensive Income (Loss) [Roll Forward]      
Balance, beginning of year (27,596,000) (18,599,000)  
Benefit obligation actuarial loss (4,575,000) (7,160,000)  
Net gain (loss) 2,610,000 (2,841,000)  
Amortization of net loss 1,763,000 1,004,000 915,000
Balance, end of year (27,798,000) (27,596,000) (18,599,000)
Other Defined Benefit Plans [Member]
      
Components of the Change in Accumulated Other Comprehensive Income (Loss) [Roll Forward]      
Balance, beginning of year (832,000) (600,000)  
Benefit obligation actuarial loss (227,000) (264,000)  
Amortization of net loss 52,000 32,000 22,000
Balance, end of year $ (1,007,000) $ (832,000) $ (600,000)