Impairment, Disposition Of Property And Equipment, And Restaurant Closing Costs (Narrative) (Details) $ in Thousands	12 Months Ended
	Oct. 01, 2017 USD ($) restaurant	Oct. 02, 2016 USD ($)	Sep. 27, 2015 USD ($) center
Impairment, Disposition of Property and Equipment, and Restaurant Closing Costs [Line Items]
Business Exit Costs	$ 7,237	$ 3,431	$ 3,592
Accelerated depreciation	$ 2,336	$ 2,214	$ 6,260
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
accelerated depreciation [Member] | Jack in the box brand restaurant operations [Member]
Impairment, Disposition of Property and Equipment, and Restaurant Closing Costs [Line Items]
Number of Restaurants Anticipated to Close in Future Periods | restaurant	3