Consolidated Statements Of Comprehensive Income - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2017	Oct. 01, 2016	Sep. 30, 2017	Oct. 01, 2016
Comprehensive Income (Loss), Net of Tax, Attributable to Parent [Abstract]
Net earnings	$ 177,424	$ 169,979	$ 530,320	$ 486,793
Foreign currency translation adjustment and other (net of taxes (benefit) of $(100) and $991 for the three and nine months ended September 30, 2017; and $1,282 and $3,437 for the three and nine months ended October 1, 2016)	10,806	(2,085)	37,369	(8,557)
Unrealized holding gain (loss) on available-for-sale investments (net of taxes (benefit) of $(1) and $34 for the three and nine months ended September 30, 2017; and $(188) and $101 for the three and nine months ended October 1, 2016)	(2)	(308)	55	164
Comprehensive income	$ 188,228	$ 167,586	$ 567,744	$ 478,400