Restructuring Charges - Activity in Restructuring Reserve (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jul. 04, 2021	Jun. 28, 2020	Jul. 04, 2021	Jun. 28, 2020
Restructuring Cost and Reserve [Line Items]
Restructuring charges	$ 0	$ 14,798	$ 0	$ 14,798
Accrued Expenses
Restructuring Reserve [Roll Forward]
Balance at beginning of period			2,389
Cash payments			(1,263)
Foreign exchange rate changes			(3)
Balance at end of period	1,123		1,123
One-time Termination Benefits
Restructuring Cost and Reserve [Line Items]
Restructuring charges		10,386
One-time Termination Benefits | Accrued Expenses
Restructuring Reserve [Roll Forward]
Balance at beginning of period			1,624
Cash payments			(1,117)
Foreign exchange rate changes			0
Balance at end of period	507		507
Contract Termination Costs
Restructuring Cost and Reserve [Line Items]
Restructuring charges		3,995
Contract Termination Costs | Accrued Expenses
Restructuring Reserve [Roll Forward]
Balance at beginning of period			750
Cash payments			(131)
Foreign exchange rate changes			(3)
Balance at end of period	616		616
Other Associated Costs
Restructuring Cost and Reserve [Line Items]
Restructuring charges		$ 417
Other Associated Costs | Accrued Expenses
Restructuring Reserve [Roll Forward]
Balance at beginning of period			15
Cash payments			(15)
Foreign exchange rate changes			0
Balance at end of period	$ 0		$ 0