Employee Retirement Plans Additional Information (Details) $ in Thousands	3 Months Ended
	Apr. 03, 2021 USD ($) plan	Mar. 28, 2020 USD ($)
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	$ 194	$ 645
Interest cost	4,290	6,418
Expected return on assets	(19,531)	(17,982)
Amortization of net loss (gain)	3,152	837
Amortization of prior service cost (credit)	716	638
Defined Benefit Plan, Net Periodic Benefit Cost (Credit)	$ (11,179)	$ (9,444)