CONDENSED CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME (Unaudited) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 26, 2021	Jun. 27, 2020	Jun. 26, 2021	Jun. 27, 2020
Statement Of Income And Comprehensive Income [Abstract]
Net income	$ 35,051	$ 7,424	$ 59,164	$ 3,020
Other comprehensive (loss) gain, net of tax:
Change in net unrealized (losses) gains on available-for-sale marketable securities	(567)	795	(698)	269
Change in currency translation adjustments	537	2,495	(1,362)	264
Total other comprehensive (loss) gain, net of tax	(30)	3,290	(2,060)	533
Total comprehensive income	$ 35,021	$ 10,714	$ 57,104	$ 3,553