Pensions and Other Benefit Plans - Rates Used to Develop Actuarial Present Value of Projected Benefit Obligation (Details)	12 Months Ended
	Dec. 31, 2017	Jan. 01, 2017	Jan. 03, 2016
Retirement Plans
Weighted average assumptions used in calculating net periodic benefit cost
Service cost discount rate	3.59%	3.98%	3.78%
Interest cost discount rate	3.98%	4.24%	3.78%
Rate of increase in compensation levels	4.01%	4.02%	4.05%
Expected long-term rate of return on plan assets	8.43%	8.55%	8.53%
Defined Benefit Plan, Weighted Average Assumptions Used in Calculating Benefit Obligation [Abstract]
Discount rate assumption benefit obligation	3.30%	3.78%	4.11%
Rate of compensation increase benefit obligation	3.99%	4.02%	4.01%
Other Benefit Plans
Weighted average assumptions used in calculating net periodic benefit cost
Service cost discount rate	4.63%	4.77%	4.31%
Interest cost discount rate	3.94%	4.10%	4.31%
Rate of increase in compensation levels	4.31%	4.32%	4.11%
Defined Benefit Plan, Weighted Average Assumptions Used in Calculating Benefit Obligation [Abstract]
Discount rate assumption benefit obligation	3.78%	4.42%	4.63%
Rate of compensation increase benefit obligation	4.30%	4.29%	4.28%