Summary Of Refranchisings, Franchisee Development And Acquisitions (Purchase Price Allocations On Franchise Acquisitions) (Details) - restaurant	9 Months Ended
Jul. 05, 2015	Jul. 06, 2014
Jack in the box brand restaurant operations [Member]
Summary Of Refranchisings, Franchisee Development And Acquisitions [Line Items]
Significant Changes, Franchises Purchased During Period	7	4

The number of franchises purchased during the period when there are significant changes in franchisor-owned outlets or franchised outlets during the period.

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 952

-SubTopic 605

-Section 50

-Paragraph 3

-Subparagraph (b)

-URI http://asc.fasb.org/extlink&oid=51665471&loc=d3e68639-108044

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