Share-based Compensation Expense (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended		9 Months Ended
	Sep. 29, 2013	Sep. 30, 2012	Sep. 29, 2013	Sep. 30, 2012
Share-based Compensation
Share-based compensation expense before taxes	$ 27,409	$ 23,072	$ 76,080	$ 70,148
Related income tax benefits	(8,059)	(7,821)	(23,123)	(23,780)
Share-based compensation expense, net of taxes	19,350	15,251	52,957	46,368
Cost of product revenue [Member]
Share-based Compensation
Share-based compensation expense before taxes	1,524	1,928	4,410	5,584
Cost of service and other revenue [Member]
Share-based Compensation
Share-based compensation expense before taxes	233	142	544	327
Research and development [Member]
Share-based Compensation
Share-based compensation expense before taxes	9,561	7,764	26,521	22,878
Selling, General and Administrative Expenses [Member]
Share-based Compensation
Share-based compensation expense before taxes	$ 16,091	$ 13,238	$ 44,605	$ 41,359