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Marketable Securities - Schedule of Gross Unrealized Losses and Fair Value by Major Security Type (Details) - USD ($) $ in Thousands | Jun. 26, 2021 | Dec. 26, 2020
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Marketable Securities [Line Items] |  |
Gross Unrealized Losses Less than 12 Consecutive Months | $ (6,534) | $ (3,863)
Fair Value Less than 12 Consecutive Months | 553,475 | 357,878
Gross Unrealized Losses 12 Consecutive Months or Longer | (1,058) | (976)
Fair Value 12 Consecutive Months or Longer | 23,923 | 14,173
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss, Total | (7,592) | (4,839)
Fair Value, Total | 577,398 | 372,051
Agency securities [Member] |  |
Marketable Securities [Line Items] |  |
Gross Unrealized Losses Less than 12 Consecutive Months | (29) |
Fair Value Less than 12 Consecutive Months | 5,946 |
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss, Total | (29) |
Mortgage-backed securities [Member] |  |
Marketable Securities [Line Items] |  |
Gross Unrealized Losses Less than 12 Consecutive Months | (195) | (1,849)
Fair Value Less than 12 Consecutive Months | 17,387 | 85,688
Gross Unrealized Losses 12 Consecutive Months or Longer | (594) | (74)
Fair Value 12 Consecutive Months or Longer | 6,628 | 2,122
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss, Total | (789) | (1,923)
Fair Value, Total | 24,015 | 87,810
Corporate securities [Member] |  |
Marketable Securities [Line Items] |  |
Gross Unrealized Losses Less than 12 Consecutive Months | (4,236) | (1,065)
Fair Value Less than 12 Consecutive Months | 360,009 | 199,187
Gross Unrealized Losses 12 Consecutive Months or Longer | (58) | (572)
Fair Value 12 Consecutive Months or Longer | 7,136 | 8,625
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss, Total | (4,294) | (1,637)
Fair Value, Total | 367,145 | 207,812
Municipal securities [Member] |  |
Marketable Securities [Line Items] |  |
Gross Unrealized Losses Less than 12 Consecutive Months | (1,950) | (223)
Fair Value Less than 12 Consecutive Months | 156,686 | 50,403
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss, Total | (1,950) | (223)
Fair Value, Total | 156,686 | 50,403
Other [Member] |  |
Marketable Securities [Line Items] |  |
Gross Unrealized Losses Less than 12 Consecutive Months | (124) | (726)
Fair Value Less than 12 Consecutive Months | 13,447 | 22,600
Gross Unrealized Losses 12 Consecutive Months or Longer | (406) | (330)
Fair Value 12 Consecutive Months or Longer | 10,159 | 3,426
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss, Total | (530) | (1,056)
Fair Value, Total | $ 23,606 | $ 26,026

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- Definition Amount of accumulated unrealized loss on investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale), in continuous unrealized loss position for 12 months or longer, without allowance for credit loss. Includes beneficial interest in securitized financial asset. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 7 -URI http://asc.fasb.org/extlink&oid=121645371&loc=d3e27337-111563 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 326 -SubTopic 30 -Section 50 -Paragraph 5 -URI http://asc.fasb.org/extlink&oid=121582814&loc=SL82922890-210455 + Details
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