Restructuring - Activity Related to Restructuring Plans (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 30, 2017	Dec. 31, 2016	Jan. 02, 2016
Restructuring Reserve [Roll Forward]
Beginning Balance	$ 1,874	$ 5,078	$ 182
Restructuring charges	7,196	9,267	19,239
Costs paid or otherwise settled	(6,623)	(12,471)	(14,343)
Ending Balance	2,447	1,874	5,078
Severance and related
Restructuring Reserve [Roll Forward]
Beginning Balance	801	3,696	0
Restructuring charges	2,484	2,883	12,861
Costs paid or otherwise settled	(2,093)	(5,778)	(9,165)
Ending Balance	1,192	801	3,696
Lease termination
Restructuring Reserve [Roll Forward]
Beginning Balance	1,036	1,005	43
Restructuring charges	811	2,993	2,667
Costs paid or otherwise settled	(977)	(2,962)	(1,705)
Ending Balance	870	1,036	1,005
Software Contracts & Engineering Tools
Restructuring Reserve [Roll Forward]
Beginning Balance	25	377	0
Restructuring charges	3,066	1,903	3,040
Costs paid or otherwise settled	(2,731)	(2,255)	(2,663)
Ending Balance	360	25	377
Other
Restructuring Reserve [Roll Forward]
Beginning Balance	12	0	139
Restructuring charges	835	1,488	671
Costs paid or otherwise settled	(822)	(1,476)	(810)
Ending Balance	$ 25	$ 12	$ 0