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		6 Months Ended
		Apr. 10, 2016 USD ($) restaurant	Apr. 12, 2015 USD ($) restaurant	Apr. 10, 2016 USD ($) restaurant	Apr. 12, 2015 USD ($) restaurant
Summary Of Refranchisings, Franchisee Development And Acquisitions [Line Items]
Initial franchise fees		$ 120	$ 608	$ 505	$ 983
Proceeds from the sale of company-operated restaurants (1)	[1]	0	1,456	1,021	2,630
Net assets sold (primarily property and equipment)		(3)	(1,945)	(196)	(2,434)
Goodwill related to the sale of company-operated restaurants		0	(16)	(10)	(32)
Other (2)	[2]	0	(4,515)	0	(4,334)
(Losses) gains on the sale of company-operated restaurants		(3)	(5,020)	815	(4,170)
Proceeds From Extension Of Franchise And Lease Agreements		$ 0	$ 0	$ 1,000	$ 100
Jack in the box brand restaurant operations [Member]
Summary Of Refranchisings, Franchisee Development And Acquisitions [Line Items]
Significant Changes, Franchises Sold | restaurant		0	20	1	21
New restaurants opened by franchisees | restaurant		0	5	5	11
Qdoba brand restaurant operations [Member]
Summary Of Refranchisings, Franchisee Development And Acquisitions [Line Items]
New restaurants opened by franchisees | restaurant		4	5	10	11

[1] Amounts in 2016 and 2015 include additional proceeds recognized upon the extension of the underlying franchise and lease agreements related to restaurants sold in a prior year of $1.0 million and $0.1 million, respectively, year-to-date. No additional proceeds were recognized during the quarter in either year.

[2] (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.