Stock Based Compensation (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Oct. 01, 2016	Oct. 03, 2015	Oct. 01, 2016	Oct. 03, 2015
Share-based compensation expense and allocation by cost [Line Items]
Share-based Compensation	$ 29,998	$ 24,117	$ 79,986	$ 67,681
Cost of product and maintenance
Share-based compensation expense and allocation by cost [Line Items]
Share-based Compensation	550	662	1,461	1,789
Cost of services
Share-based compensation expense and allocation by cost [Line Items]
Share-based Compensation	807	968	2,141	2,615
Marketing and sales
Share-based compensation expense and allocation by cost [Line Items]
Share-based Compensation	6,040	5,764	16,881	16,447
Research and development
Share-based compensation expense and allocation by cost [Line Items]
Share-based Compensation	18,002	12,847	46,376	35,625
General and administrative
Share-based compensation expense and allocation by cost [Line Items]
Share-based Compensation	$ 4,599	$ 3,876	$ 13,127	$ 11,205