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Marketable Securities - Schedule of Marketable Securities Classified as Available-for-sale Securities (Details) - USD ($) $ in Thousands	Sep. 25, 2021	Dec. 26, 2020
Marketable Securities [Line Items]
Amortized Cost	$ 1,588,033	$ 1,492,770
Gross Unrealized Gains	19,533	30,886
Gross Unrealized Losses	(8,763)	(4,839)
Fair Value	1,598,803	1,518,817
U.S. Treasury securities [Member] | Fair Value, Level 2 [Member]
Marketable Securities [Line Items]
Amortized Cost	400	400
Gross Unrealized Gains	1	6
Fair Value	401	406
Agency securities [Member] | Fair Value, Level 2 [Member]
Marketable Securities [Line Items]
Amortized Cost	7,975	5,954
Gross Unrealized Gains	0	56
Gross Unrealized Losses	(43)
Fair Value	7,932	6,010
Mortgage-backed securities [Member] | Fair Value, Level 2 [Member]
Marketable Securities [Line Items]
Amortized Cost	159,299	239,445
Gross Unrealized Gains	707	1,051
Gross Unrealized Losses	(625)	(1,923)
Fair Value	159,381	238,573
Corporate securities [Member] | Fair Value, Level 2 [Member]
Marketable Securities [Line Items]
Amortized Cost	1,051,416	984,696
Gross Unrealized Gains	16,021	25,962
Gross Unrealized Losses	(5,606)	(1,637)
Fair Value	1,061,831	1,009,021
Municipal securities [Member] | Fair Value, Level 2 [Member]
Marketable Securities [Line Items]
Amortized Cost	335,507	214,515
Gross Unrealized Gains	2,748	3,644
Gross Unrealized Losses	(1,845)	(223)
Fair Value	336,410	217,936
Other [Member] | Fair Value, Level 2 [Member]
Marketable Securities [Line Items]
Amortized Cost	33,436	47,760
Gross Unrealized Gains	56	167
Gross Unrealized Losses	(644)	(1,056)
Fair Value	$ 32,848	$ 46,871

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Amount, before tax, of unrealized gain in accumulated other comprehensive income (AOCI) on investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale).

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