Employee Benefit Plans - Funded Status of Defined Benefit Plans (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 29, 2019	Dec. 30, 2018	Dec. 31, 2017	Dec. 29, 2019	Dec. 30, 2018
Amounts recognized in accumulated other comprehensive income (after tax)
Total amount recognized				$ 56,700	$ 43,610
Foreign Plan
Change in benefit obligation
Benefit obligation, beginning of year	$ 285,508	$ 320,548
Service cost	1,589	1,112	$ 1,628
Interest cost	5,676	5,467	5,559
Benefits and expenses paid	(13,034)	(11,850)
Business combinations	0	36,903
Actuarial loss (gain)	37,409	(53,753)
Curtailment gain	(2,421)	0
Member contributions	221	233
Currency translation adjustment	(107)	(13,152)
Benefit obligation, end of year	314,841	285,508	320,548
Change in plan assets
Plan assets, beginning of year	249,313	307,166
Actual return on assets	24,999	(37,495)
Company contributions	3,954	4,095
Benefits paid	(13,034)	(11,850)
Currency translation adjustment	1,218	(12,603)
Plan assets, end of year	266,450	249,313	307,166
Reconciliation to balance sheet
Funded status benefit asset/(liability)				(48,391)	(36,195)
Amounts recognized in accumulated other comprehensive income (after tax)
Unrecognized actuarial loss				47,561	37,141
Unamortized prior service credits				0	(437)
Total amount recognized				47,561	36,704
Accumulated Benefit Obligation				314,841	284,581
Projected Benefit Obligation	285,508	285,508	320,548	314,841	285,508
UK Plan
Change in benefit obligation
Benefit obligation, beginning of year	157,351
Benefit obligation, end of year	170,958	157,351
Amounts recognized in accumulated other comprehensive income (after tax)
Accumulated Benefit Obligation				170,958	157,351
Projected Benefit Obligation	157,351	157,351		170,958	157,351
Plan Assets				174,156	158,990
Dutch Plan
Change in benefit obligation
Benefit obligation, beginning of year	91,837
Benefit obligation, end of year	100,996	91,837
Amounts recognized in accumulated other comprehensive income (after tax)
Accumulated Benefit Obligation				100,996	90,910
Projected Benefit Obligation	91,837	91,837		100,996	91,837
Plan Assets				92,294	90,323
Nora Plan
Change in benefit obligation
Benefit obligation, beginning of year	36,320
Benefit obligation, end of year	42,887	36,320
Amounts recognized in accumulated other comprehensive income (after tax)
Accumulated Benefit Obligation				42,887	36,320
Projected Benefit Obligation	36,320	36,320		42,887	36,320
Plan Assets				0	0
United States
Change in benefit obligation
Benefit obligation, beginning of year	29,142	31,919
Service cost	0	0	0
Interest cost	1,154	1,082	1,256
Benefits and expenses paid	(2,030)	(2,030)
Actuarial loss (gain)	3,474	(1,829)
Benefit obligation, end of year	31,740	29,142	31,919
Change in plan assets
Company contributions	2,000
Amounts recognized in the consolidated balance sheets
Current liabilities				(2,030)	(2,030)
Non-current liabilities				(29,710)	(27,112)
Amounts recognized in accumulated other comprehensive income (after tax)
Unrecognized actuarial loss				9,139	6,906
Accumulated Benefit Obligation				31,700	29,100
Projected Benefit Obligation	$ 29,142	$ 29,142	$ 31,919	31,740	29,142
Total benefit obligation				$ 31,740	$ 29,142