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Marketable Securities - Schedule of Marketable Securities Classified as Available-for-sale Securities (Details) - USD ($) $ in Thousands | Jun. 26, 2021 | Dec. 26, 2020
--- | --- | ---
Marketable Securities [Line Items] |  |
Amortized Cost | $ 1,519,722 | $ 1,492,770
Gross Unrealized Gains | 22,142 | 30,886
Gross Unrealized Losses | (7,592) | (4,839)
Fair Value | 1,534,272 | 1,518,817
U.S. Treasury securities [Member] | Fair Value, Level 2 [Member] |  |
Marketable Securities [Line Items] |  |
Amortized Cost | 400 | 400
Gross Unrealized Gains | 3 | 6
Fair Value | 403 | 406
Agency securities [Member] | Fair Value, Level 2 [Member] |  |
Marketable Securities [Line Items] |  |
Amortized Cost | 8,474 | 5,954
Gross Unrealized Gains | 12 | 56
Gross Unrealized Losses | (29) |
Fair Value | 8,457 | 6,010
Mortgage-backed securities [Member] | Fair Value, Level 2 [Member] |  |
Marketable Securities [Line Items] |  |
Amortized Cost | 173,372 | 239,445
Gross Unrealized Gains | 818 | 1,051
Gross Unrealized Losses | (789) | (1,923)
Fair Value | 173,401 | 238,573
Corporate securities [Member] | Fair Value, Level 2 [Member] |  |
Marketable Securities [Line Items] |  |
Amortized Cost | 997,362 | 984,696
Gross Unrealized Gains | 18,346 | 25,962
Gross Unrealized Losses | (4,294) | (1,637)
Fair Value | 1,011,414 | 1,009,021
Municipal securities [Member] | Fair Value, Level 2 [Member] |  |
Marketable Securities [Line Items] |  |
Amortized Cost | 301,919 | 214,515
Gross Unrealized Gains | 2,872 | 3,644
Gross Unrealized Losses | (1,950) | (223)
Fair Value | 302,841 | 217,936
Other [Member] | Fair Value, Level 2 [Member] |  |
Marketable Securities [Line Items] |  |
Amortized Cost | 38,195 | 47,760
Gross Unrealized Gains | 91 | 167
Gross Unrealized Losses | (530) | (1,056)
Fair Value | $ 37,756 | $ 46,871

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