Stock Based Compensation (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 28, 2020	Mar. 30, 2019
Share-based compensation expense and allocation by cost [Line Items]
Stock-based compensation expense	$ 46,482	$ 42,253
Cost of product and maintenance
Share-based compensation expense and allocation by cost [Line Items]
Stock-based compensation expense	691	681
Cost of services
Share-based compensation expense and allocation by cost [Line Items]
Stock-based compensation expense	880	866
Marketing and sales
Share-based compensation expense and allocation by cost [Line Items]
Stock-based compensation expense	10,011	9,106
Research and development
Share-based compensation expense and allocation by cost [Line Items]
Stock-based compensation expense	29,346	26,898
General and administrative
Share-based compensation expense and allocation by cost [Line Items]
Stock-based compensation expense	$ 5,554	$ 4,702