Pension Plans and Postretirement Benefits (Postretirement Benefit cost (income)) (Details) - Postretirement Plans - USD ($)	12 Months Ended
	Dec. 29, 2019	Dec. 30, 2018	Dec. 31, 2017
Defined Benefit Plan Disclosure [Line Items]
Service cost - benefits earned during the period (in millions)	$ 0	$ 0	$ 0
Interest cost on projected benefit obligation	400,000	400,000	400,000
Amortization of actuarial gain	(300,000)	(300,000)	(400,000)
Postretirement benefits non-service expense	$ 100,000	$ 100,000	$ 0