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Employee Benefit Plans (Components Of The Change In Unamortized Actuarial Losses, Net, Included In Accumulated Other Comprehensive Income) (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 28, 2016
Dec. 30, 2015
Dec. 31, 2014
AOCI Attributable To Parent, Net Of Tax [Roll Forward]      
Net (loss) gain $ (342) $ (3,894) $ 1,248
Settlement loss recognized 24,297 0 0
Minimum pension liability adjustment (21,819) (2,230) 6,304
Total minimum pension liability adjustments included as a component of accumulated other comprehensive loss, net of tax (900) (22,800)  
Total minimum pension liability adjustments included as a component of accumulated other comprehensive loss, tax benefit 100 2,200  
Pension Plan [Member]      
AOCI Attributable To Parent, Net Of Tax [Roll Forward]      
Balance, beginning of year (23,955) (27,574)  
Benefit obligation actuarial gain (loss) (945) 5,780  
Net (loss) gain 603 (3,894)  
Amortization of net loss 0 1,733 924
Settlement loss recognized 24,297 0 0
Balance, end of year 0 (23,955) (27,574)
Other Defined Benefit Plans [Member]      
AOCI Attributable To Parent, Net Of Tax [Roll Forward]      
Balance, beginning of year (1,045) (1,081)  
Benefit obligation actuarial gain (loss) (73) (43)  
Amortization of net loss 85 79 66
Settlement loss recognized 0 0 50
Balance, end of year $ (1,033) $ (1,045) $ (1,081)