Consolidated Statements Of Comprehensive Income (USD $) In Thousands, unless otherwise specified	3 Months Ended		9 Months Ended
	Sep. 28, 2013	Sep. 29, 2012	Sep. 28, 2013	Sep. 29, 2012
Comprehensive Income (Loss), Net of Tax, Attributable to Parent [Abstract]
Net earnings	$ 115,344	$ 98,887	$ 338,291	$ 285,424
Foreign currency translation adjustment and other (net of taxes (benefit) of $(1,366) and $(1,984) for the three and nine months ended September 28, 2013; and $(843) and $(1,478) for the three and nine months ended September 29, 2012)	10,595	6,240	(7,610)	5,247
Unrealized holding gain (loss) on available-for-sale investments (net of taxes (benefit) of $509 and $(34) for the three and nine months ended September 28, 2013; and $321 and $338 for the three and nine months ended September 29, 2012)	801	518	(59)	546
Comprehensive income	$ 126,740	$ 105,645	$ 330,622	$ 291,217