Stock Based Compensation (Details) - USD ($) $ in Thousands	3 Months Ended
	Apr. 02, 2016	Apr. 04, 2015
Share-based compensation expense and allocation by cost [Line Items]
Share-based Compensation	$ 24,632	$ 21,861
Cost of product and maintenance
Share-based compensation expense and allocation by cost [Line Items]
Share-based Compensation	464	569
Cost of services
Share-based compensation expense and allocation by cost [Line Items]
Share-based Compensation	681	832
Marketing and sales
Share-based compensation expense and allocation by cost [Line Items]
Share-based Compensation	5,536	5,447
Research and development
Share-based compensation expense and allocation by cost [Line Items]
Share-based Compensation	13,897	11,377
General and administrative
Share-based compensation expense and allocation by cost [Line Items]
Share-based Compensation	$ 4,054	$ 3,636