Stock Based Compensation (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jul. 01, 2017	Jul. 02, 2016	Jul. 01, 2017	Jul. 02, 2016
Share-based compensation expense and allocation by cost [Line Items]
Share-based Compensation	$ 30,482	$ 25,356	$ 57,918	$ 49,988
Cost of product and maintenance
Share-based compensation expense and allocation by cost [Line Items]
Share-based Compensation	491	447	1,020	911
Cost of services
Share-based compensation expense and allocation by cost [Line Items]
Share-based Compensation	717	653	1,478	1,334
Marketing and sales
Share-based compensation expense and allocation by cost [Line Items]
Share-based Compensation	6,237	5,305	12,245	10,841
Research and development
Share-based compensation expense and allocation by cost [Line Items]
Share-based Compensation	18,014	14,477	33,496	28,374
General and administrative
Share-based compensation expense and allocation by cost [Line Items]
Share-based Compensation	$ 5,023	$ 4,474	$ 9,679	$ 8,528