Summary Of Refranchisings, Franchisee Development And Acquisitions (Number Of Restaurants Sold And Developed By Franchisees And Related Gains And Fees Recognized) (Details) $ in Thousands		12 Months Ended
		Oct. 02, 2016 USD ($) restaurant	Sep. 27, 2015 USD ($) restaurant	Sep. 28, 2014 USD ($) restaurant
Summary Of Refranchisings, Franchisee Development And Acquisitions [Line Items]
Initial franchise fees		$ 955	$ 1,453	$ 1,886
Proceeds from the sale of company-operated restaurants (1)		1,439	3,951	10,536
Goodwill related to the sale of company-operated restaurants		(15)	(47)
(Gains) losses on the sale of company-operated restaurants		$ 1,230	$ (3,139)	$ (3,548)
Jack in the box brand restaurant operations [Member]
Summary Of Refranchisings, Franchisee Development And Acquisitions [Line Items]
Restaurants sold to franchisees (restaurants) | restaurant		1	21	37
New restaurants opened by franchisees (restaurants) | restaurant		12	16	11
Proceeds from the sale of company-operated restaurants (1)	[1]	$ 1,439	$ 3,951	$ 10,536
Net assets sold (primarily property and equipment)		(195)	(4,283)	(5,558)
Goodwill related to the sale of company-operated restaurants		(15)	(47)	(170)
Other	[2]	$ 1	$ (2,760)	$ (6,500)
Number of Restaurants | restaurant		2,255	2,249	2,250
Proceeds from extension of franchise and lease agreements		$ 1,400	$ 1,500	$ 2,100
Jack in the box brand restaurant operations [Member] | Subtotal of gains (losses) on sale of company-operated restaurants [Member]
Summary Of Refranchisings, Franchisee Development And Acquisitions [Line Items]
(Gains) losses on the sale of company-operated restaurants		1,230	$ (3,139)	(1,692)
Jack in the box brand restaurant operations [Member] | Loss on anticipated sale [Member]
Summary Of Refranchisings, Franchisee Development And Acquisitions [Line Items]
Restaurants sold to franchisees (restaurants) | restaurant			20
(Gains) losses on the sale of company-operated restaurants	[3]	0	$ 0	$ (1,856)
Number of Restaurants | restaurant				25
Number of Restaurants Closed | restaurant			5
Jack in the box brand restaurant operations [Member] | Total gain (loss) on the sale of company-operated restaurants [Member]
Summary Of Refranchisings, Franchisee Development And Acquisitions [Line Items]
(Gains) losses on the sale of company-operated restaurants		$ 1,230	$ (3,139)	$ (3,548)
Qdoba brand restaurant operations [Member]
Summary Of Refranchisings, Franchisee Development And Acquisitions [Line Items]
New restaurants opened by franchisees (restaurants) | restaurant		18	22	22
Goodwill related to the sale of company-operated restaurants		$ 0	$ 0
Number of Restaurants | restaurant		699	661	638

[1] (1)Amounts in 2016, 2015 and 2014 include additional proceeds of $1.4 million, $1.5 million and $2.1 million, respectively, recognized upon the extension of the underlying franchise and lease agreements related to restaurants sold in a prior year.

[2] (2)Amounts in 2015 and 2014 primarily represent impairment and lease commitment charges related to restaurants closed in connection with the sale of the related markets, and charges for operating restaurant leases with lease commitments in excess of our sublease rental income.

[3] (3)In 2014, the loss on the anticipated sale of a Jack in the Box market relates to 25 company-operated restaurants of which we sold 20, and closed the remaining five, in fiscal 2015