Stock Based Compensation (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jul. 02, 2016	Jul. 04, 2015	Jul. 02, 2016	Jul. 04, 2015
Share-based compensation expense and allocation by cost [Line Items]
Share-based Compensation	$ 25,356	$ 21,703	$ 49,988	$ 43,564
Cost of product and maintenance
Share-based compensation expense and allocation by cost [Line Items]
Share-based Compensation	447	558	911	1,127
Cost of services
Share-based compensation expense and allocation by cost [Line Items]
Share-based Compensation	653	815	1,334	1,647
Marketing and sales
Share-based compensation expense and allocation by cost [Line Items]
Share-based Compensation	5,305	5,236	10,841	10,683
Research and development
Share-based compensation expense and allocation by cost [Line Items]
Share-based Compensation	14,477	11,401	28,374	22,778
General and administrative
Share-based compensation expense and allocation by cost [Line Items]
Share-based Compensation	$ 4,474	$ 3,693	$ 8,528	$ 7,329