Restructuring - Activity Related to Restructuring Plans (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 29, 2018	Dec. 30, 2017	Dec. 31, 2016
Restructuring Reserve [Roll Forward]
Beginning Balance	$ 2,447	$ 1,874	$ 5,078
Restructuring charges	17,349	7,196	9,267
Costs paid or otherwise settled	(9,116)	(6,623)	(12,471)
Ending Balance	10,680	2,447	1,874
Severance and related
Restructuring Reserve [Roll Forward]
Beginning Balance	1,192	801	3,696
Restructuring charges	5,696	2,484	2,883
Costs paid or otherwise settled	(5,074)	(2,093)	(5,778)
Ending Balance	1,814	1,192	801
Lease Termination
Restructuring Reserve [Roll Forward]
Beginning Balance	870	1,036	1,005
Restructuring charges	7,379	811	2,993
Costs paid or otherwise settled	381	(977)	(2,962)
Ending Balance	8,630	870	1,036
Software Contracts & Engineering Tools
Restructuring Reserve [Roll Forward]
Beginning Balance	360	25	377
Restructuring charges	913	3,066	1,903
Costs paid or otherwise settled	(1,055)	(2,731)	(2,255)
Ending Balance	218	360	25
Other
Restructuring Reserve [Roll Forward]
Beginning Balance	25	12	0
Restructuring charges	3,361	835	1,488
Costs paid or otherwise settled	(3,368)	(822)	(1,476)
Ending Balance	$ 18	$ 25	$ 12