Variable Interest Entities (Components Of FFE's Balance Sheet) (Details) - USD ($) $ in Thousands		Jul. 05, 2015	Sep. 28, 2014
Variable Interest Entity [Line Items]
Other current assets		$ 1,494	$ 597
Current liabilities		217,031	206,307
Other long-term liabilities		312,309	309,435
Retained earnings		1,303,892	1,244,897
Total liabilities and stockholders' equity		1,275,614	1,270,665
Jack In The Box Franchise Finance, LLC (FFE) [Member]
Variable Interest Entity [Line Items]
Cash		159	0
Other current assets	[1]	1,041	2,494
Other assets, net	[1]	2,216	5,776
Total assets		3,416	8,270
Current liabilities	[2]	1,153	2,833
Other long-term liabilities	[2]	2,127	5,367
Retained earnings		136	70
Total liabilities and stockholders' equity		$ 3,416	$ 8,270

[1] Consists primarily of amounts due from franchisees.

[2] Consists primarily of the capital note contribution from Jack in the Box which is eliminated in consolidation.