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Marketable Securities - Additional Information (Details) - USD ($)	6 Months Ended
	Jun. 27, 2020	Dec. 28, 2019
Schedule Of Available For Sale Securities [Line Items]
Accrued interest written off	$ 0
Percentage of available-for-sale securities in unrealized loss positions	19.00%
Allowance for credit losses on securities in an unrealized loss position	$ 0	$ 0
Allowance for credit loss	0
Prepaid Expenses and Other Current Assets [Member]
Schedule Of Available For Sale Securities [Line Items]
Accrued interest receivable	$ 9,506,000

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