Nature Of Operations And Summary Of Significant Accounting Policies (Narrative) (Details) (USD $)	12 Months Ended									12 Months Ended
	Sep. 28, 2014	Sep. 29, 2013	Sep. 30, 2012	Sep. 28, 2014 Jack In The Box [Member] restaurant	Sep. 29, 2013 Jack In The Box [Member] restaurant	Sep. 30, 2012 Jack In The Box [Member] restaurant	Sep. 28, 2014 Qdoba [Member] restaurant	Sep. 29, 2013 Qdoba [Member] restaurant	Sep. 30, 2012 Qdoba [Member] restaurant	Sep. 28, 2014 Minimum [Member]	Sep. 28, 2014 Maximum [Member]	Sep. 28, 2014 Continuing Operations [Member]	Sep. 29, 2013 Continuing Operations [Member]	Sep. 30, 2012 Continuing Operations [Member]	Sep. 28, 2014 Other Assets [Member]	Sep. 29, 2013 Other Assets [Member]	Jul. 07, 2013 2013 Qdoba Closures [Member] restaurant
Nature Of Operations And Summary Of Significant Accounting Policies [Line Items]
Number of Restaurants				2,250	2,251	2,250	638	615	627								62
General liability and workers' comp estimated claims to be paid by insurance providers	$ 24,600,000	$ 22,900,000
Assets Held For Sale And LeaseBack	3,477,000	11,574,000
Fiscal year	P52W	P52W	P52W
Property, plant and equipment assigned lives, minimum (in years)										2 years 0 months 0 days	35 years 0 months 0 days
Cash surrender value of policy															100,700,000	94,500,000
Cash included in trust	100,000	200,000
Book overdrafts	0	800,000
Period of franchise agreement (in years)	20
Revenue recognized on unredeemed gift cards	800,000	700,000	500,000
Marketing funds including contractual contributions				5.00%	5.00%	5.00%	1.00%	1.00%	1.00%
Other Assets Held-for-sale, Current	1,289,000	301,000
Assets Held For Sale Including Assets Held for Sale And LeaseBack	4,766,000	11,875,000
Depreciation, Depletion and Amortization	$ 91,384,000	$ 96,219,000	$ 97,958,000									$ 90,700,000	$ 92,000,000	$ 92,600,000