Summary Of Refranchisings, Franchisee Development And Acquisitions (Number Of Restaurants Sold And Developed By Franchisees And Related Gains And Fees Recognized) (Details) (USD $)	4 Months Ended
	Jan. 18, 2015 restaurant	Jan. 19, 2014 restaurant
Summary Of Refranchisings, Franchisee Development And Acquisitions [Line Items]
Proceeds From Extension Of Franchise And Lease Agreements	$ 100,000	$ 500,000
Significant Changes, Franchises Sold	1	0
New restaurants opened by franchisees	12	13
Initial franchise fees	375,000	399,000
Proceeds	(1,174,000)	(468,000)
Net assets sold (primarily property and equipment)	(489,000)	0
Goodwill related to the sale of company-operated restaurants	(16,000)
Disposal Group Not Discontinued Operation Other Gain Loss On Disposal	181,000	2,000
Disposal Group, Not Discontinued Operation, Gain (Loss) on Disposal	850,000	461,000
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		461,000
Jack In The Box [Member]
Summary Of Refranchisings, Franchisee Development And Acquisitions [Line Items]
Goodwill related to the sale of company-operated restaurants	$ (16,000)	$ (9,000)