Restructuring Charges - Activity in Restructuring Reserve (Details) - Accrued Expenses $ in Thousands	3 Months Ended
	Apr. 04, 2021 USD ($)
Restructuring Reserve [Roll Forward]
Balance at beginning of period	$ 2,389
Cash payments	(1,034)
Foreign exchange rate changes	(5)
Balance at end of period	1,350
One-time Termination Benefits
Restructuring Reserve [Roll Forward]
Balance at beginning of period	1,624
Cash payments	(951)
Foreign exchange rate changes	(1)
Balance at end of period	672
Contract Termination Costs
Restructuring Reserve [Roll Forward]
Balance at beginning of period	750
Cash payments	(68)
Foreign exchange rate changes	(4)
Balance at end of period	678
Other Associated Costs
Restructuring Reserve [Roll Forward]
Balance at beginning of period	15
Cash payments	(15)
Foreign exchange rate changes	0
Balance at end of period	$ 0