Consolidated Statements Of Comprehensive Income - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2020	Jun. 29, 2019	Jun. 30, 2020	Jun. 29, 2019
Comprehensive Income (Loss), Net of Tax, Attributable to Parent [Abstract]
Net earnings	$ 134,748	$ 126,969	$ 281,907	$ 293,188
Foreign currency translation adjustment and other (net of taxes (benefit) of $(88) and $337 for the three and six months ended June 30, 2020; and $179 and $(4) for the three and six months ended June 29, 2019, respectively)	9,197	(100)	(11,349)	2,221
Unrealized loss on cash flow hedge (net of tax benefit of $332 and $6,682 for the three and six months ended June 30, 2020; and $4,069 for both the three and six months ended June 29, 2019, respectively)	(1,007)	(12,370)	(20,315)	(12,370)
Unrealized holding gain on available-for-sale investments (net of taxes of $494 and $215 for the three and six months ended June 30, 2020; and $71 and $281 for the three and six months ended June 29, 2019, respectively)	1,502	216	653	853
Comprehensive income	144,440	114,715	250,896	283,892
Foreign currency translation adjustment and other, taxes (benefit)	(88)	179	337	(4)
Unrealized loss on cash flow hedge, taxes (benefit)	332		6,682	4,069
Change in net unrealized holding gain (loss) on available-for-sale investments, taxes (benefit)	$ 494	$ 71	$ 215	$ 281