Retirement and Post Retirement Health Care Plans (Schedule Of Defined Benefit Pension Assets Investment) (Details)	12 Months Ended
	Jan. 02, 2021	Dec. 28, 2019
Defined Benefit Plan Disclosure [Line Items]
Equity investments, Target Allocation	100.00%
Target Return	6.20%
Equity investments, Actual Allocation	100.00%	100.00%
Equity Investments
Defined Benefit Plan Disclosure [Line Items]
Equity investments, Target Allocation	70.40%
Fixed income, Target Return minimum	6.20%
Fixed income, Target Return maximum	7.80%
Equity investments, Actual Allocation	72.40%	70.00%
Fixed Income
Defined Benefit Plan Disclosure [Line Items]
Equity investments, Target Allocation	24.80%
Fixed income, Target Return minimum	1.50%
Fixed income, Target Return maximum	4.80%
Equity investments, Actual Allocation	26.80%	25.00%
Other
Defined Benefit Plan Disclosure [Line Items]
Equity investments, Target Allocation	4.80%
Target Return	5.60%
Equity investments, Actual Allocation	0.80%	5.00%