Share-Based Compensation (Details 2) (USD $) In Thousands	3 Months Ended		9 Months Ended
	Oct. 02, 2011	Oct. 03, 2010	Oct. 02, 2011	Oct. 03, 2010
Share Based Compensation [Abstract]
Share-based compensation expense	$ 15,729	$ 20,944	$ 44,678	$ 52,791
Total tax benefit recognized	(3,977)	(6,360)	(11,709)	(15,108)
Decrease in net income	11,752	14,584	32,969	37,683
Cost of product revenues [Member]
Share Based Compensation [Abstract]
Share-based compensation expense	1,283	1,205	3,316	4,972
Research and Development [Member]
Share Based Compensation [Abstract]
Share-based compensation expense	8,345	6,629	23,273	19,975
Sales and marketing [Member]
Share Based Compensation [Abstract]
Share-based compensation expense	2,704	2,959	7,746	8,299
General and administrative [Member]
Share Based Compensation [Abstract]
Share-based compensation expense	3,397	10,151	10,343	19,545
Stock options and SARs [Member]
Share Based Compensation [Abstract]
Share-based compensation expense	8,224	15,650	23,873	36,411
Restricted Stock units [Member]
Share Based Compensation [Abstract]
Share-based compensation expense	6,201	3,339	15,311	11,047
Employee Stock Purchase Plan Shares [Member]
Share Based Compensation [Abstract]
Share-based compensation expense	$ 1,304	$ 1,955	$ 5,494	$ 5,333