Restructuring - Activity Related to Restructuring Plans (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 28, 2019	Dec. 29, 2018	Dec. 30, 2017
Restructuring Reserve [Roll Forward]
Beginning Balance	$ 10,680	$ 2,447	$ 1,874
Restructuring charges	4,664	17,349	7,196
Costs paid or otherwise settled	(7,734)	(9,116)	(6,623)
Ending Balance	7,610	10,680	2,447
Severance & Related
Restructuring Reserve [Roll Forward]
Beginning Balance	1,814	1,192	801
Restructuring charges	625	5,696	2,484
Costs paid or otherwise settled	(2,279)	(5,074)	(2,093)
Ending Balance	160	1,814	1,192
Lease Termination & Fixed Assets
Restructuring Reserve [Roll Forward]
Beginning Balance	8,630	870	1,036
Restructuring charges	2,716	7,379	811
Costs paid or otherwise settled	(4,761)	381	(977)
Ending Balance	6,585	8,630	870
Software Contracts & Engineering Tools
Restructuring Reserve [Roll Forward]
Beginning Balance	218	360	25
Restructuring charges	0	913	3,066
Costs paid or otherwise settled	(218)	(1,055)	(2,731)
Ending Balance	0	218	360
Other
Restructuring Reserve [Roll Forward]
Beginning Balance	18	25	12
Restructuring charges	1,323	3,361	835
Costs paid or otherwise settled	(476)	(3,368)	(822)
Ending Balance	$ 865	$ 18	$ 25