Employee Benefit Plans (Schedule of Net Benefit Costs, Other Postretirement Benefits) (Details) - USD ($) $ in Thousands	12 Months Ended
	Jan. 03, 2021	Dec. 29, 2019	Dec. 30, 2018
Pension Plans, Defined Benefit
Defined Benefit Plan Disclosure [Line Items]
Service cost	$ 7,414	$ 6,598	$ 6,853
Interest cost	12,876	16,546	16,146
Expected return on plan assets	(21,786)	(24,561)	(28,939)
Defined Benefit Plan, Net Periodic Benefit Cost (Credit), Gain (Loss) Due to Curtailment	0	1,547	0
Actuarial loss (gain)	(20,291)	(27,134)	(17,146)
Amortization of prior service cost	0	(152)	375
Net periodic benefit cost	18,795	24,018	11,581
Other Postretirement Benefit Plans, Defined Benefit [Member]
Defined Benefit Plan Disclosure [Line Items]
Service cost	73	87	106
Interest cost	94	116	120
Expected return on plan assets	(1,389)	(1,175)	(1,254)
Defined Benefit Plan, Amortization of Gain (Loss)	(1,647)	(1,776)	1,621
Actuarial loss (gain)	(179)	108
Net periodic benefit cost	$ (2,869)	$ (2,748)	$ 593