Consolidated Statements Of Comprehensive Income - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 29, 2018	Sep. 30, 2017	Sep. 29, 2018	Sep. 30, 2017
Comprehensive Income (Loss), Net of Tax, Attributable to Parent [Abstract]
Net earnings	$ 169,381	$ 177,424	$ 498,739	$ 530,320
Foreign currency translation adjustment and other (net of taxes (benefit) of $(13) and $572 for the three and nine months ended September 29, 2018; and $(100) and $991 for the three and nine months ended September 30, 2017)	(8,907)	10,806	(27,924)	37,369
Unrealized holding gain (loss) on available-for-sale investments (net of taxes (benefit) of $181 and $97 for the three and nine months ended September 29, 2018; and $(1) and $34 for the three and nine months ended September 30, 2017)	553	(2)	297	55
Comprehensive income	$ 161,027	$ 188,228	$ 471,112	$ 567,744