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Marketable Securities - Additional Information (Details) - USD ($)	9 Months Ended
	Sep. 25, 2021	Dec. 26, 2020
Schedule Of Available For Sale Securities [Line Items]
Accrued interest written off	$ 0
Percentage of available-for-sale securities in unrealized loss positions	37.00%
Allowance For Credit Losses On Available For Sale Debt Securities In Unrealized Loss Position	$ 0	$ 0
Allowance for credit losses and charge to other income	0
Prepaid Expenses and Other Current Assets [Member]
Schedule Of Available For Sale Securities [Line Items]
Accrued interest receivable	$ 9,671,000

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