Variable Interest Entities (Components Of FFE's Balance Sheet) (Details) (USD $) In Thousands, unless otherwise specified	Apr. 13, 2014		Sep. 29, 2013
Variable Interest Entity [Line Items]
Other current assets	$ 1,103		$ 108
Current liabilities	178,772		211,674
Other long-term liabilities	275,579		286,124
Retained earnings	1,219,910		1,171,823
Total liabilities and stockholders' equity	1,314,386		1,319,209
Jack In The Box Franchise Finance, LLC (FFE) [Member]
Variable Interest Entity [Line Items]
Cash	0		250
Other current assets	2,449	[1]	2,368	[1]
Other assets, net	7,032	[1]	8,367	[1]
Total assets	9,481		10,985
Current liabilities	3,064		3,010
Other long-term liabilities	6,422	[2]	8,076	[2]
Retained earnings	(5)		(101)
Total liabilities and stockholders' equity	$ 9,481		$ 10,985

[1] Consists primarily of amounts due from franchisees.

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