Nature Of Operations And Summary Of Significant Accounting Policies (Summary Of Advertising Costs) (Details) - USD ($) $ in Thousands	12 Months Ended
	Oct. 02, 2016	Sep. 27, 2015	Sep. 28, 2014
Nature Of Operations And Summary Of Significant Accounting Policies [Line Items]
Advertising costs	$ 61,677	$ 59,582	$ 60,564
Jack in the box brand restaurant operations [Member]
Nature Of Operations And Summary Of Significant Accounting Policies [Line Items]
Advertising costs	41,189	41,895	42,349
Qdoba brand restaurant operations [Member]
Nature Of Operations And Summary Of Significant Accounting Policies [Line Items]
Advertising costs	$ 20,488	$ 17,687	$ 18,215