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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 Benefits Plan [Member] - USD ($)
$ in Thousands
12 Months Ended
Jan. 03, 2021
Dec. 29, 2019
Dec. 30, 2018
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets at beginning of year $ 19,216 $ 16,279  
Realized gains (losses) 1,647 1,776 $ (1,621)
Fair value of plan assets at end of year 21,972 19,216 16,279
Fair Value, Inputs, Level 3 [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets at beginning of year 130    
Fair value of plan assets at end of year 0 130  
Multi-strategy hedge funds [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets at beginning of year 130    
Fair value of plan assets at end of year   130  
Multi-strategy hedge funds [Member] | Fair Value, Inputs, Level 3 [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Defined Benefit Plan, Plan Assets Level 3 Reconciliation, Increase (Decrease) for Purchase, Sale, and Settlement 130 1,074  
Fair value of plan assets at beginning of year 130 1,176 1,151
Realized gains (losses)   315  
Unrealized gains (losses)   (287) 25
Fair value of plan assets at end of year $ 0 $ 130 $ 1,176