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Significant Accounting Policies - Basis of Presentation (Details) | 9 Months Ended | 12 Months Ended
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Sep. 28, 2021 | Dec. 29, 2020
Significant Accounting Policies |  |
Length of fiscal year | 364 days | 364 days

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- Definition Duration of a fiscal period, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. Includes, but not limited to, weeks in a year or quarter. + References No definition available. + Details
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