Fair Value Measurements (Financial Assets And Liabilities Measured At Fair Value On Recurring Basis) (Details) (USD $) In Thousands, unless otherwise specified	9 Months Ended																																													9 Months Ended
	Jul. 07, 2013	Jul. 07, 2013 Fair Value, Measurements, Recurring [Member]	Sep. 30, 2012 Fair Value, Measurements, Recurring [Member]	Jul. 07, 2013 Fair Value, Measurements, Recurring [Member] Interest Rate Swaps [Member]		Sep. 30, 2012 Fair Value, Measurements, Recurring [Member] Interest Rate Swaps [Member]		Jul. 07, 2013 Fair Value, Measurements, Recurring [Member] Quoted Prices In Active Markets For Identical Assets (Level 1) [Member]		Sep. 30, 2012 Fair Value, Measurements, Recurring [Member] Quoted Prices In Active Markets For Identical Assets (Level 1) [Member]		Jul. 07, 2013 Fair Value, Measurements, Recurring [Member] Quoted Prices In Active Markets For Identical Assets (Level 1) [Member] Interest Rate Swaps [Member]		Sep. 30, 2012 Fair Value, Measurements, Recurring [Member] Quoted Prices In Active Markets For Identical Assets (Level 1) [Member] Interest Rate Swaps [Member]		Jul. 07, 2013 Fair Value, Measurements, Recurring [Member] Fair Value, Inputs, Level 2 [Member]		Sep. 30, 2012 Fair Value, Measurements, Recurring [Member] Fair Value, Inputs, Level 2 [Member]		Jul. 07, 2013 Fair Value, Measurements, Recurring [Member] Fair Value, Inputs, Level 2 [Member] Interest Rate Swaps [Member]		Sep. 30, 2012 Fair Value, Measurements, Recurring [Member] Fair Value, Inputs, Level 2 [Member] Interest Rate Swaps [Member]		Jul. 07, 2013 Fair Value, Measurements, Recurring [Member] Fair Value, Inputs, Level 3 [Member]	Sep. 30, 2012 Fair Value, Measurements, Recurring [Member] Fair Value, Inputs, Level 3 [Member]	Jul. 07, 2013 Fair Value, Measurements, Recurring [Member] Fair Value, Inputs, Level 3 [Member] Interest Rate Swaps [Member]		Sep. 30, 2012 Fair Value, Measurements, Recurring [Member] Fair Value, Inputs, Level 3 [Member] Interest Rate Swaps [Member]		Jul. 07, 2013 Non Qualified Deferred Compensation Plan [Member] Fair Value, Measurements, Recurring [Member]		Sep. 30, 2012 Non Qualified Deferred Compensation Plan [Member] Fair Value, Measurements, Recurring [Member]		Jul. 07, 2013 Non Qualified Deferred Compensation Plan [Member] Fair Value, Measurements, Recurring [Member] Quoted Prices In Active Markets For Identical Assets (Level 1) [Member]		Sep. 30, 2012 Non Qualified Deferred Compensation Plan [Member] Fair Value, Measurements, Recurring [Member] Quoted Prices In Active Markets For Identical Assets (Level 1) [Member]		Jul. 07, 2013 Non Qualified Deferred Compensation Plan [Member] Fair Value, Measurements, Recurring [Member] Fair Value, Inputs, Level 2 [Member]		Sep. 30, 2012 Non Qualified Deferred Compensation Plan [Member] Fair Value, Measurements, Recurring [Member] Fair Value, Inputs, Level 2 [Member]		Jul. 07, 2013 Non Qualified Deferred Compensation Plan [Member] Fair Value, Measurements, Recurring [Member] Fair Value, Inputs, Level 3 [Member]		Sep. 30, 2012 Non Qualified Deferred Compensation Plan [Member] Fair Value, Measurements, Recurring [Member] Fair Value, Inputs, Level 3 [Member]		Jul. 07, 2013 Long Lived Assets Held-for-sale, Name [Domain]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Total liabilities at fair value		$ (39,424)	$ (40,970)	$ (1,427)	[1]	$ (2,433)	[1]	$ (37,997)	[2]	$ (38,537)	[2]	$ 0	[1],[2]	$ 0	[1],[2]	$ (1,427)	[2]	$ (2,433)	[2]	$ (1,427)	[1],[2]	$ (2,433)	[1],[2]	$ 0	$ 0	$ 0	[1]	$ 0	[1]	$ (37,997)	[3]	$ (38,537)	[3]	$ (37,997)	[2],[3]	$ (38,537)	[2],[3]	$ 0	[2],[3]	$ 0	[2],[3]	$ 0	[3]	$ 0	[3]
Impairment charges and other																																														4,821
Implied fair value of underperforming or intend to close Jack in the Box restaurants	705																																													625
Impairment of Long-Lived Assets Held-for-use	$ 3,385

[1] We entered into interest rate swaps to reduce our exposure to rising interest rates on our variable debt. The fair values of our interest rate swaps are based upon Level 2 inputs which include valuation models as reported by our counterparties. The key inputs for the valuation models are quoted market prices, interest rates and forward yield curves.

[2] We did not have any transfers in or out of Level 1 or Level 2.

[3] We maintain an unfunded defined contribution plan for key executives and other members of management excluded from participation in our qualified savings plan. The fair value of this obligation is based on the closing market prices of the participants’ elected investments.