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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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- Definition 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). + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=121645371&loc=d3e27161-111563 + Details
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