Consolidated Statements Of Comprehensive Income - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jul. 01, 2017	Jul. 02, 2016	Jul. 01, 2017	Jul. 02, 2016
Comprehensive Income (Loss), Net of Tax, Attributable to Parent [Abstract]
Net earnings	$ 179,683	$ 166,454	$ 352,896	$ 316,814
Foreign currency translation adjustment and other (net of taxes of $904 and $1,091 for the three and six months ended July 1, 2017; and $33 and $2,155 for the three and six months ended July 2, 2016)	16,158	(14,762)	26,563	(6,472)
Unrealized holding gain (loss) on available-for-sale investments (net of taxes (benefit) of $(33) and $35 for the three and six months ended July 1, 2017; and $56 and $289 for the three and six months ended July 2, 2016)	(54)	92	57	472
Comprehensive income	$ 195,787	$ 151,784	$ 379,516	$ 310,814