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Restructuring and Other Charges (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 26, 2020	Sep. 28, 2019	Sep. 26, 2020	Sep. 28, 2019
Restructuring Reserve [Roll Forward]
Beginning balance			$ 9,638
Restructuring and other credits	$ 13	$ (186)	(1,329)	$ (1,188)
Cash payments			(7,155)
Effect of foreign currency translation			(53)
Ending balance	1,101		1,101
Employee Severance and Benefits [Member]
Restructuring Reserve [Roll Forward]
Beginning balance			9,229
Restructuring and other credits			(1,280)
Cash payments			(6,955)
Effect of foreign currency translation			(50)
Ending balance	944		944
Excess Facilities [Member]
Restructuring Reserve [Roll Forward]
Beginning balance			409
Restructuring and other credits			(49)
Cash payments			(200)
Effect of foreign currency translation			(3)
Ending balance	$ 157		$ 157