Stock-Based Compensation (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 26, 2020	Sep. 28, 2019	Sep. 26, 2020	Sep. 28, 2019
Share-based compensation expense and allocation by cost [Line Items]
Stock-based compensation expense	$ 45,334	$ 48,279	$ 138,723	$ 134,789
Cost of product and maintenance
Share-based compensation expense and allocation by cost [Line Items]
Stock-based compensation expense	668	731	2,042	2,064
Cost of services
Share-based compensation expense and allocation by cost [Line Items]
Stock-based compensation expense	850	931	2,599	2,626
Marketing and sales
Share-based compensation expense and allocation by cost [Line Items]
Stock-based compensation expense	9,699	10,424	29,826	29,039
Research and development
Share-based compensation expense and allocation by cost [Line Items]
Stock-based compensation expense	28,652	30,458	87,688	85,015
General and administrative
Share-based compensation expense and allocation by cost [Line Items]
Stock-based compensation expense	$ 5,465	$ 5,735	$ 16,568	$ 16,045