Accumulated Other Comprehensive Income - Roll Forward (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 26, 2021	Jun. 27, 2020	Jun. 26, 2021	Jun. 27, 2020
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Balance,	$ 1,161,257	$ 1,077,185	$ 1,146,115	$ 1,058,745
Other comprehensive income gain (loss), net of tax	195	1,029	(580)	1,118
Balance,	1,186,585	1,111,347	1,186,585	1,111,347
Accumulated Other Comprehensive Income (Loss) [Member]
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Balance,	2,512	1,569	3,286	1,480
Balance,	2,706	$ 2,598	2,706	$ 2,598
Unrealized Gains (Losses) On Available-For-Sale Marketable Securities [Member]
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Balance,			3,286
Other comprehensive loss before reclassifications			(580)
Other comprehensive income gain (loss), net of tax			(580)
Balance,	$ 2,706		$ 2,706