Share-Based Compensation-Expense Recognition (Details 3) (USD $) In Thousands, unless otherwise specified	3 Months Ended		9 Months Ended
	Sep. 30, 2012	Oct. 02, 2011	Sep. 30, 2012	Oct. 02, 2011
Employee Service Share-based Compensation, Allocation of Recognized Period Costs
Share-based compensation expense	$ 19,950	$ 15,729	$ 59,283	$ 44,678
Total tax benefit recognized	(5,464)	(3,977)	(15,309)	(11,709)
Decrease in net income	14,486	11,752	43,974	32,969
Stock options and SARs [Member]
Employee Service Share-based Compensation, Allocation of Recognized Period Costs
Share-based compensation expense	8,550	8,224	27,192	23,873
Restricted Stock Units (RSUs) [Member]
Employee Service Share-based Compensation, Allocation of Recognized Period Costs
Share-based compensation expense	9,405	6,201	25,907	15,311
Employee Stock Purchase Plan Shares [Member]
Employee Service Share-based Compensation, Allocation of Recognized Period Costs
Share-based compensation expense	1,995	1,304	6,184	5,494
Cost of product revenues [Member]
Employee Service Share-based Compensation, Allocation of Recognized Period Costs
Share-based compensation expense	1,929	1,283	5,389	3,316
Research and Development [Member]
Employee Service Share-based Compensation, Allocation of Recognized Period Costs
Share-based compensation expense	10,379	8,345	31,029	23,273
Sales and marketing [Member]
Employee Service Share-based Compensation, Allocation of Recognized Period Costs
Share-based compensation expense	3,794	2,704	11,057	7,746
General and administrative [Member]
Employee Service Share-based Compensation, Allocation of Recognized Period Costs
Share-based compensation expense	$ 3,848	$ 3,397	$ 11,808	$ 10,343