Other Postretirement Benefits - Schedule of Assumptions Used (Details) - Other Postretirement Benefit Plans	12 Months Ended
	Dec. 26, 2021	Dec. 27, 2020	Dec. 29, 2019
Defined Benefit Plan, Weighted Average Assumptions Used in Calculating Benefit Obligation [Abstract]
Discount rate	2.55%	2.01%
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	2.01%	2.94%	4.18%
Discount rate in effect for determining service cost	2.09%	3.04%	4.19%
Discount rate in effect for determining interest cost	1.38%	2.55%	3.71%
Estimated increase in compensation level	3.50%	3.50%	3.50%