Restructuring and Other Charges (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 29, 2019	Jun. 30, 2018	Jun. 29, 2019	Jun. 30, 2018
Restructuring Cost and Reserve [Line Items]
Beginning balance			$ 12,024
Restructuring and other charges (credits)	$ (313)	$ (447)	(1,002)	$ (2,438)
Cash payments			(9,944)
Effect of foreign currency translation			45
Ending balance	1,123		1,123
Employee Severance and Benefits [Member]
Restructuring Cost and Reserve [Line Items]
Beginning balance			11,176
Restructuring and other charges (credits)			(1,036)
Cash payments			(9,614)
Effect of foreign currency translation			35
Ending balance	561		561
Excess Facilities [Member]
Restructuring Cost and Reserve [Line Items]
Beginning balance			848
Restructuring and other charges (credits)			34
Cash payments			(330)
Effect of foreign currency translation			10
Ending balance	$ 562		$ 562