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Marketable Securities - Schedule of Marketable Securities Classified as Available-for-sale Securities (Details) - USD ($) $ in Thousands	Jun. 27, 2020	Dec. 28, 2019
Marketable Securities [Line Items]
Amortized Cost	$ 1,352,856	$ 1,578,937
Gross Unrealized Gains	29,829	10,224
Gross Unrealized Losses	(8,784)	(7,223)
Fair Value	1,373,901	1,581,938
U.S. Treasury securities [Member] | Fair Value, Level 2 [Member]
Marketable Securities [Line Items]
Amortized Cost	12,262	15,204
Gross Unrealized Gains	63	5
Gross Unrealized Losses	0	(30)
Fair Value	12,325	15,179
Agency securities [Member] | Fair Value, Level 2 [Member]
Marketable Securities [Line Items]
Amortized Cost	16,499	64,582
Gross Unrealized Gains	146	120
Gross Unrealized Losses	0	(27)
Fair Value	16,645	64,675
Mortgage-backed securities [Member] | Fair Value, Level 2 [Member]
Marketable Securities [Line Items]
Amortized Cost	207,545	256,417
Gross Unrealized Gains	1,321	90
Gross Unrealized Losses	(2,729)	(2,485)
Fair Value	206,137	254,022
Corporate securities [Member] | Fair Value, Level 2 [Member]
Marketable Securities [Line Items]
Amortized Cost	874,247	980,590
Gross Unrealized Gains	24,767	8,806
Gross Unrealized Losses	(1,878)	(3,746)
Fair Value	897,136	985,650
Municipal securities [Member] | Fair Value, Level 2 [Member]
Marketable Securities [Line Items]
Amortized Cost	170,227	163,898
Gross Unrealized Gains	3,416	1,092
Gross Unrealized Losses	(88)	(235)
Fair Value	173,555	164,755
Other [Member] | Fair Value, Level 2 [Member]
Marketable Securities [Line Items]
Amortized Cost	72,076	98,246
Gross Unrealized Gains	116	111
Gross Unrealized Losses	(4,089)	(700)
Fair Value	$ 68,103	$ 97,657

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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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