Postretirement Benefits Assumed Health Care Trend Rates (Details)	12 Months Ended
	Jan. 01, 2017 Rate	Jan. 03, 2016 Rate	Dec. 28, 2014 Rate
Compensation and Retirement Disclosure [Abstract]
Defined Benefit Plan, Health Care Cost Trend Rate Assumed for Next Fiscal Year, pre-65	7.50%	7.75%	8.00%
Defined Benefit Plan, Health Care Cost Trend Rate Assumed for Next Fiscal Year, post-65	6.50%	6.75%	7.00%
Prescription drug benefit cost trend rate assumed for the following year	10.50%	11.00%	9.00%
Rate to which the cost trend rate is assumed to decline (the ultimate trend rate)	3.89%	3.89%	3.89%
Year that the rate reaches the ultimate trend rate	2075	2075	2075