Number of operating segments. An operating segment is a component of an enterprise: (a) that engages in business activities from which it may earn revenues and incur expenses (including revenues and expenses relating to transactions with other components of the same enterprise), (b) whose operating results are regularly reviewed by the enterprise's chief operating decision maker to make decisions about resources to be allocated to the segment and assess its performance, and (c) for which discrete financial information is available. An operating segment may engage in business activities for which it has yet to earn revenues, for example, start-up operations may be operating segments before earning revenues.

No definition available.

Name:	us-gaap_NumberOfOperatingSegments
Namespace Prefix:	us-gaap_
Data Type:	xbrli:integerItemType
Balance Type:	na
Period Type:	duration

Basis Of Presentation (Details) - segment	3 Months Ended		9 Months Ended	12 Months Ended
Basis Of Presentation (Details) - segment	Dec. 30, 2016	Jan. 01, 2016	Jun. 30, 2017	Sep. 29, 2017	Sep. 30, 2016
Significant Accounting Policies [Line Items]
Number of weeks in fiscal year	13 years	13 years			53 years
Number of Operating Segments			1
Scenario, Forecast [Member]
Significant Accounting Policies [Line Items]
Number of weeks in fiscal year				52 years