Condensed Consolidated Statements of Comprehensive Income (Unaudited) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 27, 2020	Jun. 29, 2019	Jun. 27, 2020	Jun. 29, 2019
Statement Of Income And Comprehensive Income [Abstract]
Net income	$ 184,180	$ 223,656	$ 345,360	$ 363,829
Foreign currency translation adjustment	24,813	314	18,637	(8,920)
Change in fair value of available-for-sale marketable securities, net of deferred taxes	33,109	16,029	15,218	35,171
Comprehensive income	$ 242,102	$ 239,999	$ 379,215	$ 390,080