Stock Based Compensation (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 30, 2019	Mar. 31, 2018
Share-based compensation expense and allocation by cost [Line Items]
Share-based Compensation	$ 42,253	$ 37,901
Cost of product and maintenance
Share-based compensation expense and allocation by cost [Line Items]
Share-based Compensation	681	590
Cost of services
Share-based compensation expense and allocation by cost [Line Items]
Share-based Compensation	866	863
Marketing and sales
Share-based compensation expense and allocation by cost [Line Items]
Share-based Compensation	9,106	7,614
Research and development
Share-based compensation expense and allocation by cost [Line Items]
Share-based Compensation	26,898	23,235
General and administrative
Share-based compensation expense and allocation by cost [Line Items]
Share-based Compensation	$ 4,702	$ 5,599