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Employee Benefit Plans (Schedule of Effect of Significant Unobservable Inputs, Changes in Plan Assets, Other Postretirement Benefit Plans) (Details) - Other Postretirement Benefit Plan [Member] - USD ($)
$ in Thousands
12 Months Ended
Jan. 01, 2017
Jan. 03, 2016
Dec. 28, 2014
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets at beginning of year $ 14,353 $ 14,728  
Realized gains (losses) 539 (971) $ 384
Fair value of plan assets at end of year 15,453 14,353 14,728
Fair Value, Inputs, Level 3 [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets at beginning of year 1,374    
Fair value of plan assets at end of year 1,508 1,374  
Multi-strategy hedge funds [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets at beginning of year 1,374    
Fair value of plan assets at end of year 1,508 1,374  
Multi-strategy hedge funds [Member] | Fair Value, Inputs, Level 3 [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets at beginning of year 1,374 1,341 1,217
Unrealized gains (losses) 134 33 124
Fair value of plan assets at end of year $ 1,508 $ 1,374 $ 1,341