Share-based Compensation Expense (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 28, 2015	Jun. 29, 2014	Jun. 28, 2015	Jun. 29, 2014
Share-based Compensation
Share-based compensation expense before taxes	$ 32,957	$ 35,996	$ 64,875	$ 69,420
Related income tax benefits	(9,315)	(11,674)	(18,428)	(22,251)
Share-based compensation expense, net of taxes	23,642	24,322	46,447	47,169
Cost of product revenue
Share-based Compensation
Share-based compensation expense before taxes	2,113	2,149	4,445	4,244
Cost of service and other revenue
Share-based Compensation
Share-based compensation expense before taxes	466	284	745	569
Research and development
Share-based Compensation
Share-based compensation expense before taxes	10,747	12,785	22,054	24,454
Selling, general and administrative
Share-based Compensation
Share-based compensation expense before taxes	$ 19,631	$ 20,778	$ 37,631	$ 40,153