CONDENSED CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME (Unaudited) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 25, 2021	Sep. 26, 2020	Sep. 25, 2021	Sep. 26, 2020
Statement Of Income And Comprehensive Income [Abstract]
Net income	$ 36,448	$ 8,091	$ 95,612	$ 11,111
Other comprehensive gain (loss), net of tax:
Change in net unrealized gains (losses) on available-for-sale marketable securities	461	(72)	(237)	197
Change in currency translation adjustments	55	1,803	(1,307)	2,067
Total other comprehensive gain (loss), net of tax	516	1,731	(1,544)	2,264
Total comprehensive income	$ 36,964	$ 9,822	$ 94,068	$ 13,375