Retirement and Post Retirement Health Care Plans (Schedule of Net Periodic Benefit Costs and Benefit Payments Expected Future Service) (Details) - USD ($)	12 Months Ended
	Dec. 29, 2018	Dec. 30, 2017	Dec. 31, 2016
Pension Plan
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Service Cost	$ 7,300,000	$ 7,200,000	$ 8,100,000
Interest Cost	9,300,000	9,300,000	9,800,000
Expected Return on Plan Assets	(11,900,000)	(11,200,000)	(11,900,000)
Amortization of Net Actuarial Loss	(3,500,000)	(2,300,000)	(3,100,000)
Amortization of Prior Service Cost	200,000	200,000	200,000
Net Periodic Benefit Cost	8,400,000	7,800,000	9,300,000
Prior Service Cost	200,000	100,000	100,000
Net Actuarial (Gain) Loss	2,700,000	1,500,000	2,000,000
Total Recognized in OCI	2,900,000	1,600,000	$ 2,100,000
2019	15,400,000
2020	15,800,000
2021	16,400,000
2022	16,500,000
2023	16,900,000
2024-2027	88,700,000
Postretirement Health Coverage
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Service Cost	100,000	100,000
Interest Cost	400,000	400,000
Amortization of Prior Service Cost	0
Net Periodic Benefit Cost	500,000	$ 500,000
2019	700,000
2020	800,000
2021	900,000
2022	900,000
2023	900,000
2024-2027	$ 3,800,000