Employee Retirement Plans Additional Information (Details) $ in Thousands	3 Months Ended		6 Months Ended
	Jul. 03, 2021 USD ($)	Jun. 27, 2020 USD ($)	Jul. 03, 2021 USD ($) plan	Jun. 27, 2020 USD ($)
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Number of defined contribution 401K savings plans | plan			2
Non-US Plans
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Service cost	$ 196	$ 624	$ 390	$ 1,269
Interest cost	4,350	6,212	8,640	12,630
Expected return on assets	(19,804)	(17,405)	(39,335)	(35,387)
Amortization of net loss (gain)	3,196	810	6,348	1,647
Amortization of prior service cost (credit)	726	617	1,442	1,255
Defined Benefit Plan, Net Periodic Benefit Cost (Credit)	$ (11,336)	$ (9,142)	$ (22,515)	$ (18,586)