Other Postretirement Benefits - Schedule of Assumptions Used (Details) - Other Postretirement Benefit Plans [Member]	12 Months Ended
	Dec. 30, 2018	Dec. 31, 2017	Dec. 25, 2016
Defined Benefit Plan, Weighted Average Assumptions Used in Calculating Benefit Obligation [Abstract]
Discount rate	4.18%	3.46%
Rate of increase in compensation levels	3.50%	3.50%
Defined Benefit Plan, Weighted Average Assumptions Used in Calculating Net Periodic Benefit Cost [Abstract]
Discount rate for determining projected benefit obligation	3.46%	3.93%	4.05%
Discount rate in effect for determining service cost	3.56%	4.08%	4.24%
Discount rate in effect for determining interest cost	3.01%	3.21%	2.96%
Estimated increase in compensation level	3.50%	3.50%	3.50%