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Marketable Securities - Schedule of Gross Unrealized Losses and Fair Value by Major Security Type (Details) - USD ($) $ in Thousands | Dec. 25, 2021 | Dec. 26, 2020
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Marketable Securities [Line Items] |  |
Gross Unrealized Losses Less than 12 Consecutive Months | $ (14,438) | $ (3,863)
Fair Value Less than 12 Consecutive Months | 768,737 | 357,878
Gross Unrealized Losses 12 Consecutive Months or Longer | (4,116) | (976)
Fair Value 12 Consecutive Months or Longer | 129,241 | 14,173
Gross Unrealized Losses, Total | (18,554) | (4,839)
Fair Value, Total | 897,978 | 372,051
Agency securities [Member] |  |
Marketable Securities [Line Items] |  |
Gross Unrealized Losses Less than 12 Consecutive Months | (110) |
Fair Value Less than 12 Consecutive Months | 6,890 |
Gross Unrealized Losses, Total | (110) |
Fair Value, Total | 6,890 |
Mortgage-backed securities [Member] |  |
Marketable Securities [Line Items] |  |
Gross Unrealized Losses Less than 12 Consecutive Months | (148) | (1,849)
Fair Value Less than 12 Consecutive Months | 18,909 | 85,688
Gross Unrealized Losses 12 Consecutive Months or Longer | (732) | (74)
Fair Value 12 Consecutive Months or Longer | 7,598 | 2,122
Gross Unrealized Losses, Total | (880) | (1,923)
Fair Value, Total | 26,507 | 87,810
Corporate securities [Member] |  |
Marketable Securities [Line Items] |  |
Gross Unrealized Losses Less than 12 Consecutive Months | (9,466) | (1,065)
Fair Value Less than 12 Consecutive Months | 499,084 | 199,187
Gross Unrealized Losses 12 Consecutive Months or Longer | (2,361) | (572)
Fair Value 12 Consecutive Months or Longer | 85,033 | 8,625
Gross Unrealized Losses, Total | (11,827) | (1,637)
Fair Value, Total | 584,117 | 207,812
Municipal securities [Member] |  |
Marketable Securities [Line Items] |  |
Gross Unrealized Losses Less than 12 Consecutive Months | (4,247) | (223)
Fair Value Less than 12 Consecutive Months | 226,009 | 50,403
Gross Unrealized Losses 12 Consecutive Months or Longer | (617) |
Fair Value 12 Consecutive Months or Longer | 29,405 |
Gross Unrealized Losses, Total | (4,864) | (223)
Fair Value, Total | 255,414 | 50,403
Other [Member] |  |
Marketable Securities [Line Items] |  |
Gross Unrealized Losses Less than 12 Consecutive Months | (467) | (726)
Fair Value Less than 12 Consecutive Months | 17,845 | 22,600
Gross Unrealized Losses 12 Consecutive Months or Longer | (406) | (330)
Fair Value 12 Consecutive Months or Longer | 7,205 | 3,426
Gross Unrealized Losses, Total | (873) | (1,056)
Fair Value, Total | $ 25,050 | $ 26,026

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