Accumulated Other Comprehensive Income (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 25, 2021	Sep. 26, 2020	Sep. 25, 2021	Sep. 26, 2020
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Balance,	$ 1,186,585	$ 1,111,347	$ 1,146,115	$ 1,058,745
Other comprehensive income gain (loss), net of tax	(103)	362	(683)	1,479
Balance,	1,206,651	1,134,706	1,206,651	1,134,706
Accumulated Other Comprehensive Income (Loss) [Member]
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Balance,	2,706	2,598	3,286	1,480
Balance,	2,603	$ 2,959	2,603	$ 2,959
Unrealized Gains (Losses) On Available-For-Sale Marketable Securities [Member]
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Balance,			3,286
Other comprehensive income (loss)			(683)
Other comprehensive income gain (loss), net of tax			(683)
Balance,	$ 2,603		$ 2,603