Consolidated Statements Of Comprehensive Income (USD $) In Thousands, unless otherwise specified	3 Months Ended		9 Months Ended
	Sep. 27, 2014	Sep. 28, 2013	Sep. 27, 2014	Sep. 28, 2013
Comprehensive Income (Loss), Net of Tax, Attributable to Parent [Abstract]
Net earnings	$ 129,002	$ 115,344	$ 377,561	$ 338,291
Foreign currency translation adjustment and other (net of tax benefit of $922 and $603 for the three and nine months ended September 27, 2014; and $1,366 and $1,984 for the three and nine months ended September 28, 2013)	(17,672)	10,595	(9,603)	(7,610)
Unrealized holding gain (loss) on available-for-sale investments (net of taxes (benefit) of $(259) and $(252) for the three and nine months ended September 27, 2014; and $509 and $(34) for the three and nine months ended September 28, 2013)	(409)	801	(397)	(59)
Comprehensive income	$ 110,921	$ 126,740	$ 367,561	$ 330,622