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Marketable Securities - Schedule of Marketable Securities Classified as Available-for-sale Securities (Details) - USD ($) $ in Thousands	Dec. 26, 2020	Dec. 28, 2019
Marketable Securities [Line Items]
Amortized Cost	$ 1,492,770	$ 1,578,937
Gross Unrealized Gains	30,886	10,224
Gross Unrealized Losses	(4,839)	(7,223)
Fair Value	1,518,817	1,581,938
U.S. Treasury securities [Member] | Fair Value, Level 2 [Member]
Marketable Securities [Line Items]
Amortized Cost	400	15,204
Gross Unrealized Gains	6	5
Gross Unrealized Losses		(30)
Fair Value	406	15,179
Agency securities [Member] | Fair Value, Level 2 [Member]
Marketable Securities [Line Items]
Amortized Cost	5,954	64,582
Gross Unrealized Gains	56	120
Gross Unrealized Losses		(27)
Fair Value	6,010	64,675
Mortgage-backed securities [Member] | Fair Value, Level 2 [Member]
Marketable Securities [Line Items]
Amortized Cost	239,445	256,417
Gross Unrealized Gains	1,051	90
Gross Unrealized Losses	(1,923)	(2,485)
Fair Value	238,573	254,022
Corporate securities [Member] | Fair Value, Level 2 [Member]
Marketable Securities [Line Items]
Amortized Cost	984,696	980,590
Gross Unrealized Gains	25,962	8,806
Gross Unrealized Losses	(1,637)	(3,746)
Fair Value	1,009,021	985,650
Municipal securities [Member] | Fair Value, Level 2 [Member]
Marketable Securities [Line Items]
Amortized Cost	214,515	163,898
Gross Unrealized Gains	3,644	1,092
Gross Unrealized Losses	(223)	(235)
Fair Value	217,936	164,755
Other [Member] | Fair Value, Level 2 [Member]
Marketable Securities [Line Items]
Amortized Cost	47,760	98,246
Gross Unrealized Gains	167	111
Gross Unrealized Losses	(1,056)	(700)
Fair Value	$ 46,871	$ 97,657

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