Summary Of Refranchisings, Franchisee Development And Acquisitions (Purchase Price Allocations On Franchise Acquisitions) (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]
Restaurants acquired from franchisees (restaurants) | restaurant	15
Goodwill	$ 17,034
Property and equipment	2,954
Gains on the acquisition of franchise-operated restaurants	(289)
Liabilities assumed	(114)
Other	231
Total consideration	$ 19,816
Jack in the box brand restaurant operations [Member]
Summary Of Refranchisings, Franchisee Development And Acquisitions [Line Items]
Restaurants acquired from franchisees (restaurants) | restaurant	1	7	4
Goodwill	$ 0	$ 0	$ 256
Property and equipment		646	1,398
Gains on the acquisition of franchise-operated restaurants		(33)	0
Liabilities assumed		(613)	0
Other		0	96
Total consideration		$ 0	$ 1,750
Qdoba brand restaurant operations [Member]
Summary Of Refranchisings, Franchisee Development And Acquisitions [Line Items]
Restaurants acquired from franchisees (restaurants) | restaurant	14
Goodwill	$ 17,034