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Marketable Securities - Schedule of Amortized Cost and Estimated Fair Value of Marketable Securities by Contractual Maturity (Details) - USD ($) $ in Thousands	Jun. 26, 2021	Dec. 26, 2020
Investments Debt And Equity Securities [Abstract]
Amortized Cost, Due in one year or less	$ 328,766
Amortized Cost, Due after one year through five years	1,123,801
Amortized Cost, Due after five years through ten years	63,817
Amortized Cost, Due after ten years	3,338
Amortized Cost	1,519,722	$ 1,492,770
Fair Value, Due in one year or less	330,567
Fair Value, Due after one year through five years	1,136,623
Fair Value, Due after five years through ten years	63,783
Fair Value, Due after ten years	3,299
Fair Value, Total	$ 1,534,272	$ 1,518,817

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