Summary Of Refranchisings, Franchisee Development And Acquisitions (Number Of Restaurants Sold And Developed By Franchisees And Related Gains And Fees Recognized) (Details) $ in Thousands		3 Months Ended		9 Months Ended
		Jul. 05, 2015 USD ($) restaurant	Jul. 06, 2014 USD ($) restaurant	Jul. 05, 2015 USD ($) restaurant	Jul. 06, 2014 USD ($) restaurant
Summary Of Refranchisings, Franchisee Development And Acquisitions [Line Items]
Initial franchise fees		$ 130	$ 207	$ 1,113	$ 1,361
Proceeds from Divestiture of Businesses	[1]	21	357	2,651	8,199
Net assets sold (primarily property and equipment)		(204)	(7)	(2,638)	(2,247)
Goodwill related to the sale of company-operated restaurants		0	(5)	(32)	(134)
Disposal Group Not Discontinued Operation Other Gain Loss On Disposal	[2]	0	1	(4,334)	(139)
Disposal Group, Not Discontinued Operation, Gain (Loss) on Disposal		(183)	24	(4,353)	2,242
Proceeds From Extension Of Franchise And Lease Agreements		100	400	200	1,500
Subtotal of gains (losses) on sale of company-operated restaurants [Member]
Summary Of Refranchisings, Franchisee Development And Acquisitions [Line Items]
Disposal Group, Not Discontinued Operation, Gain (Loss) on Disposal		(183)	346		5,679
Total gain (loss) on the sale of company-operated restaurants [Member]
Summary Of Refranchisings, Franchisee Development And Acquisitions [Line Items]
Disposal Group, Not Discontinued Operation, Gain (Loss) on Disposal		(183)	24	(4,353)	2,242
Loss on anticipated sale [Member]
Summary Of Refranchisings, Franchisee Development And Acquisitions [Line Items]
Disposal Group, Not Discontinued Operation, Gain (Loss) on Disposal	[3]	$ 0	$ (322)	0	$ (3,437)
Significant Changes, Franchises Sold | restaurant					43
Jack in the box brand restaurant operations [Member]
Summary Of Refranchisings, Franchisee Development And Acquisitions [Line Items]
Goodwill related to the sale of company-operated restaurants				$ (32)
New restaurants opened by franchisees | restaurant		1	3	12	10
Significant Changes, Franchises Sold | restaurant		0	0	21	14
Significant Changes, Franchises Purchased During Period | restaurant				7	4
Qdoba brand restaurant operations [Member]
Summary Of Refranchisings, Franchisee Development And Acquisitions [Line Items]
Goodwill related to the sale of company-operated restaurants				$ 0
New restaurants opened by franchisees | restaurant		4	5	15	17

[1] Amounts in 2015 and 2014 include additional proceeds recognized upon the extension of the underlying franchise and lease agreements related to restaurants sold in a prior year of $0.1 million and $0.4 million, respectively, in the quarter, and $0.2 million and $1.5 million, respectively, year-to-date.

[2] Amounts in 2015 include lease commitment charges related to restaurants closed in connection with the sale of the related market, and charges for operating restaurant leases with lease commitments in excess of our sublease rental income.

[3] Amounts in 2014 relate to losses on the expected sale of approximately 43 company-operated restaurants in three Jack in the Box markets sold in the fourth quarter of 2014 and the second quarter of 2015.