Other Postretirement Benefits - Schedule of Components of Net Periodic Postretirement Benefit Income (Details) - Other Postretirement Benefit Plans [Member] - USD ($) $ in Thousands	12 Months Ended
	Dec. 30, 2018	Dec. 31, 2017	Dec. 25, 2016
Defined Benefit Plan, Net Periodic Benefit Cost (Credit) [Abstract]
Service cost	$ 21	$ 367	$ 417
Interest cost	1,476	1,881	1,979
Amortization and other costs	4,735	3,621	4,105
Amortization of prior service credit	(6,157)	(7,755)	(8,440)
Effect of settlement/curtailment(1)	0	(32,737)	0
Net periodic pension cost	$ 75	$ (34,623)	$ (1,939)