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Marketable Securities - Additional Information (Details) - USD ($) | 3 Months Ended |
--- | --- | ---
Mar. 27, 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 | 30.00% |
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 | $ 9,844,000 |

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