Restructuring (Details) - USD ($) $ in Thousands	3 Months Ended
	Apr. 02, 2016	Apr. 04, 2015
Restructuring Reserve [Roll Forward]
Balance at beginning of the period	$ 5,078	$ 182
Restructuring charges	5,431	4,893
Costs paid or otherwise settled	(6,978)	(148)
Adjustments to prior restructuring costs		1
Balance at the end of the period	3,531	4,928
Severance and related
Restructuring Reserve [Roll Forward]
Balance at beginning of the period	3,696	0
Restructuring charges	1,676	4,893
Costs paid or otherwise settled	(3,056)	0
Adjustments to prior restructuring costs		0
Balance at the end of the period	2,316	4,893
Lease Termination
Restructuring Reserve [Roll Forward]
Balance at beginning of the period	1,005	43
Restructuring charges	220	0
Costs paid or otherwise settled	(323)	(9)
Adjustments to prior restructuring costs		1
Balance at the end of the period	902	35
Software Contracts & Engineering Tools
Restructuring Reserve [Roll Forward]
Balance at beginning of the period	377	0
Restructuring charges	2,181	0
Costs paid or otherwise settled	(2,245)	0
Adjustments to prior restructuring costs		0
Balance at the end of the period	313	0
Other
Restructuring Reserve [Roll Forward]
Balance at beginning of the period	0	139
Restructuring charges	1,354	0
Costs paid or otherwise settled	(1,354)	(139)
Adjustments to prior restructuring costs		0
Balance at the end of the period	$ 0	$ 0