Consolidated Statements Of Comprehensive Income - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 29, 2019	Jun. 30, 2018	Jun. 29, 2019	Jun. 30, 2018
Comprehensive Income (Loss), Net of Tax, Attributable to Parent [Abstract]
Net earnings	$ 126,969	$ 169,357	$ 293,188	$ 329,358
Foreign currency translation adjustment and other (net of taxes (benefit) of $179 and $(4) for the three and six months ended June 29, 2019; and $(335) and $585 for the three and six months ended June 30, 2018, respectively)	(100)	(21,811)	2,221	(19,017)
Unrealized loss on cash flow hedge (net of tax benefit of $4,069 for both the three and six months ended June 29, 2019)	(12,370)	0	(12,370)	0
Unrealized holding gain (loss) on available-for-sale investments (net of taxes (benefit) of $71 and $281 for the three and six months ended June 29, 2019; and $209 and $(84) for the three and six months ended June 30, 2018, respectively)	216	642	853	(256)
Comprehensive income	$ 114,715	$ 148,188	$ 283,892	$ 310,085