Summary Of Refranchisings, Franchisee Development And Acquisitions (Purchase Price Allocations On Franchise Acquisitions) (Details) $ in Thousands	3 Months Ended		6 Months Ended
	Apr. 16, 2017 restaurant	Apr. 10, 2016 restaurant	Apr. 16, 2017 USD ($) restaurant	Apr. 10, 2016 USD ($) restaurant
Summary Of Refranchisings, Franchisee Development And Acquisitions [Line Items]
Acquisition of franchise-operated restaurants			$ 0	$ 324
Total consideration			11,712	$ 130
Jack in the box brand restaurant operations [Member]
Summary Of Refranchisings, Franchisee Development And Acquisitions [Line Items]
Noncash or Part Noncash Acquisition, Accounts Receivable Acquired			7,900
Noncash or Part Noncash Acquisition, Payables Assumed			$ 3,800
Restaurants acquired from franchisees | restaurant	19	1	19	1
Business Combination, Bargain Purchase, Gain Recognized, Amount				$ (289)
Property and equipment			$ 2,238	58
Intangible assets			467	37
Acquisition of franchise-operated restaurants			0	324
Liabilities assumed			(814)	0
Total consideration			$ 11,712	$ 130