Retirement Plans (Schedule Of Future Cash Flows) (Details) - USD ($)	3 Months Ended	9 Months Ended
	Oct. 02, 2016	Jul. 03, 2016	Jan. 01, 2015
Defined Benefit Plan Disclosure [Line Items]
Minimum required contribution for retirement plans			$ 0
Pension Plan [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Contributions by Employer		$ 13,738,000
Postretirement Healthcare Plans [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Contributions by Employer		$ 962,000
Scenario, Forecast [Member] | Postretirement Healthcare Plans [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plans, Estimated Future Employer Contributions in Current Fiscal Year	$ 400,000
Minimum [Member] | Scenario, Forecast [Member] | Pension Plan [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plans, Estimated Future Employer Contributions in Current Fiscal Year	65,700,000
Minimum [Member] | Scenario, Forecast [Member] | Qualified Pension Plan [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Accelerated Contribution Amount	60,000,000
Maximum [Member] | Scenario, Forecast [Member] | Pension Plan [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plans, Estimated Future Employer Contributions in Current Fiscal Year	85,700,000
Maximum [Member] | Scenario, Forecast [Member] | Qualified Pension Plan [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Accelerated Contribution Amount	$ 80,000,000