Employee Benefit Plans - Change in Values Related to Level 3 Assets (Details) - Foreign Plan - USD ($) $ in Thousands	12 Months Ended
	Dec. 29, 2019	Dec. 30, 2018
Change in plan assets
Plan assets, beginning of year	$ 249,313	$ 307,166
Actual return on plan assets	24,999	(37,495)
Translation adjustment	1,218	(12,603)
Plan assets, end of year	266,450	249,313
Level 3
Change in plan assets
Plan assets, beginning of year	109,254	150,977
Actual return on plan assets	5,463	(37,610)
Purchases, sales and settlements, net	663	0
Assets transferred into level 3	2,101	696
Translation adjustment	(2,229)	(4,809)
Plan assets, end of year	$ 115,252	$ 109,254