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Pension Plans and Postretirement Benefits (Narrative) (Details)
3 Months Ended
Mar. 29, 2020
USD ($)
Jan. 01, 2020
numberOfPlans
Dec. 29, 2019
Defined Benefit Plan Disclosure [Line Items]      
Estimated contributions in current fiscal year | $ $ 0    
Qualified Plan      
Defined Benefit Plan Disclosure [Line Items]      
Number of plans   2  
Qualified Plan | Retirement Plan, Active Participants      
Defined Benefit Plan Disclosure [Line Items]      
Number of plans   1  
Qualified Plan | Retirement Plan, Inactive Participants      
Defined Benefit Plan Disclosure [Line Items]      
Number of plans   1  
Average remaining life expectancy of plan participants 17 years 8 months 12 days    
United States      
Defined Benefit Plan Disclosure [Line Items]      
Discount rate used to determine the benefit obligation 3.41%   4.59%