Impairment, Disposition Of Property And Equipment, And Restaurant Closing Costs (Impairment And Disposal Costs Included In Impairment And Other Charges) (Details) $ in Thousands		12 Months Ended
		Oct. 01, 2017 USD ($) restaurant	Oct. 02, 2016 USD ($) restaurant	Sep. 27, 2015 USD ($) center restaurant
Impairment, Disposition of Property and Equipment, and Restaurant Closing Costs [Line Items]
Business Exit Costs		$ 7,237	$ 3,431	$ 3,592
Impairment of Long-Lived Assets Held-for-use		3,096	544	557
Restructuring Costs		8,837	10,067	29
Accelerated depreciation		2,336	2,214	6,260
Gain (Loss) on Disposition of Property Plant Equipment		(3,635)	(2,654)	(1,847)
Impairment And Other Costs Net		25,141	19,057	11,757
Continuing Operations [Member]
Impairment, Disposition of Property and Equipment, and Restaurant Closing Costs [Line Items]
Gain (Loss) on Disposition of Property Plant Equipment	[1]	$ 3,635	$ 2,801	$ 1,319
Jack in the box brand restaurant operations [Member]
Impairment, Disposition of Property and Equipment, and Restaurant Closing Costs [Line Items]
Number of Closed Restaurants Related to Eminent Domain Proceeds in Current Period | center				1
Number of Restaurants | restaurant		2,251	2,255	2,249
Restructuring Costs		$ 208	$ 6,312	$ 0
Gains from Eminent Domain [Member]
Impairment, Disposition of Property and Equipment, and Restaurant Closing Costs [Line Items]
Gain (Loss) on Disposition of Property Plant Equipment				$ 900

[1] In 2015, losses on the disposition of property and equipment were offset by $0.9 million in gains from the resolution of one eminent domain matter involving a Jack in the Box restaurant.