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Marketable Securities - Additional Information (Details) | 12 Months Ended
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Dec. 26, 2020 USD ($)
Schedule Of Available For Sale Securities [Line Items] |
Percentage of available-for-sale securities in unrealized loss positions | 21.00%
Accrued interest written off | $ 0
Prepaid Expenses and Other Current Assets [Member] |
Schedule Of Available For Sale Securities [Line Items] |
Accrued interest receivable | $ 10,176,000

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