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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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- 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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