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Restructuring Charges - Activity in Restructuring Reserve (Details) - USD ($) $ in Thousands	3 Months Ended			9 Months Ended
	Sep. 27, 2020	Jun. 28, 2020	Sep. 29, 2019	Sep. 27, 2020	Sep. 29, 2019
Restructuring Reserve [Roll Forward]
Restructuring charges	$ 251	$ 14,798	$ 0	$ 15,049	$ 0
Accrued Expenses
Restructuring Reserve [Roll Forward]
Balance at beginning of period				0
Restructuring charges				15,712
Cash payments				(8,775)
Non-cash restructuring charges				(3,145)
Restructuring adjustments				(663)
Foreign exchange rate changes				188
Balance at end of period	3,317			3,317
One-time Termination Benefits
Restructuring Reserve [Roll Forward]
Restructuring charges	(36)			10,350
One-time Termination Benefits \| Accrued Expenses
Restructuring Reserve [Roll Forward]
Balance at beginning of period				0
Restructuring charges				11,117
Cash payments				(8,133)
Non-cash restructuring charges				0
Restructuring adjustments				(767)
Foreign exchange rate changes				158
Balance at end of period	2,375			2,375
Contract Termination Costs
Restructuring Reserve [Roll Forward]
Restructuring charges	104			4,099
Contract Termination Costs \| Accrued Expenses
Restructuring Reserve [Roll Forward]
Balance at beginning of period				0
Restructuring charges				3,995
Cash payments				(230)
Non-cash restructuring charges				(3,145)
Restructuring adjustments				104
Foreign exchange rate changes				13
Balance at end of period	737			737
Other Associated Costs
Restructuring Reserve [Roll Forward]
Restructuring charges	183			600
Other Associated Costs \| Accrued Expenses
Restructuring Reserve [Roll Forward]
Balance at beginning of period				0
Restructuring charges				600
Cash payments				(412)
Non-cash restructuring charges				0
Restructuring adjustments				0
Foreign exchange rate changes				17
Balance at end of period	$ 205			$ 205