Nature Of Operations And Summary Of Significant Accounting Policies (Summary Of Advertising Costs) (Details) (Company-Operated [Member], USD $) In Thousands, unless otherwise specified	12 Months Ended
	Sep. 29, 2013	Sep. 30, 2012	Oct. 02, 2011
Nature Of Operations And Summary Of Significant Accounting Policies [Line Items]
Advertising costs	$ 62,862	$ 62,892	$ 73,155
Jack In The Box [Member]
Nature Of Operations And Summary Of Significant Accounting Policies [Line Items]
Advertising costs	46,739	49,757	63,094
Qdoba [Member]
Nature Of Operations And Summary Of Significant Accounting Policies [Line Items]
Advertising costs	$ 16,123	$ 13,135	$ 10,061