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Significant Accounting Policies - Basis of Presentation (Details)	6 Months Ended	12 Months Ended
	Jul. 02, 2019	Jan. 01, 2019
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.

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