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.

No definition available.

Name:	us-gaap_FiscalPeriodDuration
Namespace Prefix:	us-gaap_
Data Type:	xbrli:durationItemType
Balance Type:	na
Period Type:	duration

Basis of Presentation and Summary of Significant Accounting Policies (Narrative) (Details)	3 Months Ended		12 Months Ended
	Dec. 28, 2018	Dec. 29, 2017	Jun. 28, 2019
Schedule of Fiscal Years [Line Items]
Fiscal Period Duration	91 days	91 days
Scenario, forecast [Member]
Schedule of Fiscal Years [Line Items]
Fiscal Period Duration			365 days