Other Postretirement Benefits - Schedule of Components of Net Periodic Postretirement Benefit Income (Details) - Other Postretirement Benefit Plans - USD ($) $ in Thousands	12 Months Ended
	Dec. 26, 2021	Dec. 27, 2020	Dec. 29, 2019
Defined Benefit Plan, Net Periodic Benefit Cost (Credit) [Abstract]
Service cost	$ 53	$ 29	$ 27
Interest cost	565	1,026	1,602
Amortization and other costs	3,407	3,051	3,375
Amortization of prior service credit	(3,098)	(4,225)	(4,766)
Net periodic postretirement benefit cost/(income)	$ 927	$ (119)	$ 238