Employee Benefit Plans (Components of Net Periodic Benefit Cost (Credit)) (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jul. 04, 2021	Jul. 05, 2020	Jul. 04, 2021	Jul. 05, 2020
Defined Benefit Pension Benefits [Member]
Components of net periodic benefit cost (credit)
Service cost	$ 1,338	$ 1,688	$ 2,672	$ 3,595
Interest cost	2,376	3,138	4,753	6,282
Expected return on plan assets	(6,121)	(5,371)	(12,248)	(10,755)
Net periodic benefit cost (credit)	(2,407)	(545)	(4,823)	(878)
Postretirement Medical Benefits [Member]
Components of net periodic benefit cost (credit)
Service cost	15	18	29	36
Interest cost	17	23	34	47
Expected return on plan assets	(397)	(347)	(794)	(694)
Net periodic benefit cost (credit)	$ (365)	$ (306)	(731)	(611)
UNITED STATES
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Plan Assets, Contributions by Employer			20,000
Foreign Plan [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Plan Assets, Contributions by Employer			$ 3,700	$ 3,400