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Marketable Securities - Schedule of Marketable Securities Classified as Available-for-sale Securities (Details) - USD ($) $ in Thousands	Mar. 27, 2021	Dec. 26, 2020
Marketable Securities [Line Items]
Amortized Cost	$ 1,539,522	$ 1,492,770
Gross Unrealized Gains	24,980	30,886
Gross Unrealized Losses	(9,048)	(4,839)
Fair Value	1,555,454	1,518,817
U.S. Treasury securities [Member] | Fair Value, Level 2 [Member]
Marketable Securities [Line Items]
Amortized Cost	400	400
Gross Unrealized Gains	5	6
Fair Value	405	406
Agency securities [Member] | Fair Value, Level 2 [Member]
Marketable Securities [Line Items]
Amortized Cost	2,498	5,954
Gross Unrealized Gains	29	56
Fair Value	2,527	6,010
Mortgage-backed securities [Member] | Fair Value, Level 2 [Member]
Marketable Securities [Line Items]
Amortized Cost	195,903	239,445
Gross Unrealized Gains	991	1,051
Gross Unrealized Losses	(1,283)	(1,923)
Fair Value	195,611	238,573
Corporate securities [Member] | Fair Value, Level 2 [Member]
Marketable Securities [Line Items]
Amortized Cost	1,040,217	984,696
Gross Unrealized Gains	20,797	25,962
Gross Unrealized Losses	(5,808)	(1,637)
Fair Value	1,055,206	1,009,021
Municipal securities [Member] | Fair Value, Level 2 [Member]
Marketable Securities [Line Items]
Amortized Cost	257,788	214,515
Gross Unrealized Gains	3,019	3,644
Gross Unrealized Losses	(1,505)	(223)
Fair Value	259,302	217,936
Other [Member] | Fair Value, Level 2 [Member]
Marketable Securities [Line Items]
Amortized Cost	42,716	47,760
Gross Unrealized Gains	139	167
Gross Unrealized Losses	(452)	(1,056)
Fair Value	$ 42,403	$ 46,871

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