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Marketable Securities - Schedule of Gross Unrealized Losses and Fair Value by Major Security Type (Details) - USD ($) $ in Thousands | Mar. 27, 2021 | Dec. 26, 2020
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Marketable Securities [Line Items] |  |
Gross Unrealized Losses Less than 12 Consecutive Months | $ (7,706) | $ (3,863)
Fair Value Less than 12 Consecutive Months | 505,152 | 357,878
Gross Unrealized Losses 12 Consecutive Months or Longer | (1,342) | (976)
Fair Value 12 Consecutive Months or Longer | 30,297 | 14,173
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss, Total | 9,048 | 4,839
Fair Value, Total | 535,449 | 372,051
Mortgage-backed securities [Member] |  |
Marketable Securities [Line Items] |  |
Gross Unrealized Losses Less than 12 Consecutive Months | (466) | (1,849)
Fair Value Less than 12 Consecutive Months | 30,984 | 85,688
Gross Unrealized Losses 12 Consecutive Months or Longer | (817) | (74)
Fair Value 12 Consecutive Months or Longer | 10,697 | 2,122
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss, Total | 1,283 | 1,923
Fair Value, Total | 41,681 | 87,810
Corporate securities [Member] |  |
Marketable Securities [Line Items] |  |
Gross Unrealized Losses Less than 12 Consecutive Months | (5,622) | (1,065)
Fair Value Less than 12 Consecutive Months | 339,722 | 199,187
Gross Unrealized Losses 12 Consecutive Months or Longer | (186) | (572)
Fair Value 12 Consecutive Months or Longer | 9,011 | 8,625
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss, Total | 5,808 | 1,637
Fair Value, Total | 348,733 | 207,812
Municipal securities [Member] |  |
Marketable Securities [Line Items] |  |
Gross Unrealized Losses Less than 12 Consecutive Months | (1,505) | (223)
Fair Value Less than 12 Consecutive Months | 123,652 | 50,403
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss, Total | 1,505 | 223
Fair Value, Total | 123,652 | 50,403
Other [Member] |  |
Marketable Securities [Line Items] |  |
Gross Unrealized Losses Less than 12 Consecutive Months | (113) | (726)
Fair Value Less than 12 Consecutive Months | 10,794 | 22,600
Gross Unrealized Losses 12 Consecutive Months or Longer | (339) | (330)
Fair Value 12 Consecutive Months or Longer | 10,589 | 3,426
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss, Total | 452 | 1,056
Fair Value, Total | $ 21,383 | $ 26,026

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- Definition Amount of 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 more than 12 months, 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 326 -SubTopic 30 -Section 50 -Paragraph 5 -URI http://asc.fasb.org/extlink&oid=121582814&loc=SL82922890-210455 Reference 2: 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 3: http://www.xbrl.org/2003/role/exampleRef -Publisher FASB -Name Accounting Standards Codification -Topic 326 -SubTopic 30 -Section 55 -Paragraph 8 -URI http://asc.fasb.org/extlink&oid=121590138&loc=SL82922954-210456 + Details
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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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