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Marketable Securities - Schedule of Amortized Cost and Estimated Fair Value of Marketable Securities by Contractual Maturity (Details) - USD ($) $ in Thousands	Mar. 27, 2021	Dec. 26, 2020
Investments Debt And Equity Securities [Abstract]
Amortized Cost, Due in one year or less	$ 340,693
Amortized Cost, Due after one year through five years	1,127,462
Amortized Cost, Due after five years through ten years	71,222
Amortized Cost, Due after ten years	145
Amortized Cost	1,539,522	$ 1,492,770
Fair Value, Due in one year or less	342,656
Fair Value, Due after one year through five years	1,140,939
Fair Value, Due after five years through ten years	71,719
Fair Value, Due after ten years	140
Fair Value, Total	$ 1,555,454	$ 1,518,817

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