Consolidated Statements Of Comprehensive Income - USD ($) $ in Thousands	3 Months Ended
	Apr. 01, 2017	Apr. 02, 2016
Comprehensive Income (Loss), Net of Tax, Attributable to Parent [Abstract]
Net earnings	$ 173,213	$ 150,360
Foreign currency translation adjustment and other (net of taxes of $187 and $2,122, respectively)	10,405	8,290
Unrealized holding gain on available-for-sale investments (net of taxes of $68 and $233, respectively)	111	380
Comprehensive income	$ 183,729	$ 159,030