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Marketable Securities - Schedule of Gross Unrealized Losses and Fair Value by Major Security Type (Details) - USD ($) $ in Thousands | Sep. 25, 2021 | Dec. 26, 2020
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Marketable Securities [Line Items] |  |
Gross Unrealized Losses Less than 12 Consecutive Months | $ (6,633) | $ (3,863)
Fair Value Less than 12 Consecutive Months | 590,765 | 357,878
Gross Unrealized Losses 12 Consecutive Months or Longer | (2,130) | (976)
Fair Value 12 Consecutive Months or Longer | 97,912 | 14,173
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss, Total | (8,763) | (4,839)
Fair Value, Total | 688,677 | 372,051
Agency securities [Member] |  |
Marketable Securities [Line Items] |  |
Gross Unrealized Losses Less than 12 Consecutive Months | (43) |
Fair Value Less than 12 Consecutive Months | 6,957 |
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss, Total | (43) |
Fair Value, Total | 6,957 |
Mortgage-backed securities [Member] |  |
Marketable Securities [Line Items] |  |
Gross Unrealized Losses Less than 12 Consecutive Months | (103) | (1,849)
Fair Value Less than 12 Consecutive Months | 14,116 | 85,688
Gross Unrealized Losses 12 Consecutive Months or Longer | (522) | (74)
Fair Value 12 Consecutive Months or Longer | 8,289 | 2,122
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss, Total | (625) | (1,923)
Fair Value, Total | 22,405 | 87,810
Corporate securities [Member] |  |
Marketable Securities [Line Items] |  |
Gross Unrealized Losses Less than 12 Consecutive Months | (4,400) | (1,065)
Fair Value Less than 12 Consecutive Months | 377,924 | 199,187
Gross Unrealized Losses 12 Consecutive Months or Longer | (1,206) | (572)
Fair Value 12 Consecutive Months or Longer | 66,783 | 8,625
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss, Total | (5,606) | (1,637)
Fair Value, Total | 444,707 | 207,812
Municipal securities [Member] |  |
Marketable Securities [Line Items] |  |
Gross Unrealized Losses Less than 12 Consecutive Months | (1,746) | (223)
Fair Value Less than 12 Consecutive Months | 176,509 | 50,403
Gross Unrealized Losses 12 Consecutive Months or Longer | (99) |
Fair Value 12 Consecutive Months or Longer | 15,287 |
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss, Total | (1,845) | (223)
Fair Value, Total | 191,796 | 50,403
Other [Member] |  |
Marketable Securities [Line Items] |  |
Gross Unrealized Losses Less than 12 Consecutive Months | (341) | (726)
Fair Value Less than 12 Consecutive Months | 15,259 | 22,600
Gross Unrealized Losses 12 Consecutive Months or Longer | (303) | (330)
Fair Value 12 Consecutive Months or Longer | 7,553 | 3,426
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss, Total | (644) | (1,056)
Fair Value, Total | $ 22,812 | $ 26,026

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