Employee Benefit Plans - Assumptions Used to Determine Net Periodic (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 29, 2019	Dec. 30, 2018	Dec. 31, 2017
Foreign Plan
Weighted average assumptions used to determine net periodic benefit cost
Discount rate	1.90%	1.90%	2.00%
Expected return on plan assets	2.10%	1.80%	2.30%
Rate of compensation	1.75%	1.75%	1.75%
Weighted average assumptions used to determine benefit obligations
Discount rate	1.70%	2.50%	2.20%
Rate of compensation	1.75%	1.75%	1.75%
Components of net periodic benefit cost
Service cost	$ 1,589	$ 1,112	$ 1,628
Interest cost	5,676	5,467	5,559
Amortizations	991	1,394	1,287
Net periodic benefit cost	$ 2,305	$ 1,712	$ 1,944
United States
Weighted average assumptions used to determine net periodic benefit cost
Discount rate	4.10%	3.50%	3.85%
Rate of compensation	0.00%	0.00%	0.00%
Weighted average assumptions used to determine benefit obligations
Discount rate	3.05%	4.10%	3.50%
Rate of compensation	0.00%	0.00%	0.00%
Components of net periodic benefit cost
Service cost	$ 0	$ 0	$ 0
Interest cost	1,154	1,082	1,256
Amortizations	375	464	364
Net periodic benefit cost	$ 1,529	$ 1,546	$ 1,620