Stock Based Compensation (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jul. 04, 2015	Jun. 28, 2014	Jul. 04, 2015	Jun. 28, 2014
Share-based compensation expense and allocation by cost [Line Items]
Share-based Compensation	$ 21,703	$ 19,077	$ 43,564	$ 37,941
Cost of product and maintenance
Share-based compensation expense and allocation by cost [Line Items]
Share-based Compensation	558	485	1,127	967
Cost of services
Share-based compensation expense and allocation by cost [Line Items]
Share-based Compensation	815	709	1,647	1,412
Marketing and sales
Share-based compensation expense and allocation by cost [Line Items]
Share-based Compensation	5,236	4,560	10,683	9,156
Research and development
Share-based compensation expense and allocation by cost [Line Items]
Share-based Compensation	11,401	9,701	22,778	19,368
General and administrative
Share-based compensation expense and allocation by cost [Line Items]
Share-based Compensation	$ 3,693	$ 3,622	$ 7,329	$ 7,038