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Segment Reporting (Summarized Financial Information Of Reportable Segments) (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Jul. 03, 2016	Jul. 05, 2015	Jul. 03, 2016	Jul. 05, 2015	Sep. 27, 2015
Segment Reporting Information [Line Items]
Consolidated revenues	$ 368,938	$ 359,506	$ 1,200,912	$ 1,186,249
Consolidated earnings from operations	55,705	50,395	171,005	155,499
Gains (losses) on the sale of company-operated restaurants	409	(183)	1,224	(4,353)
Interest expense, net	7,613	4,504	22,699	13,937
Consolidated earnings from continuing operations and before income taxes	48,092	45,891	148,306	141,562
Consolidated depreciation expense	20,814	20,174	69,748	67,675
Consolidated goodwill	149,007		149,007		$ 149,027
Total goodwill disposals			20
Qdoba brand restaurant operations [Member]
Segment Reporting Information [Line Items]
Consolidated depreciation expense	4,536	3,864	14,403	13,179
Consolidated goodwill	100,597		100,597		100,597
Total goodwill disposals			0
Jack in the box brand restaurant operations [Member]
Segment Reporting Information [Line Items]
Gains (losses) on the sale of company-operated restaurants	409	(183)	1,224	(4,353)
Consolidated depreciation expense	14,877	14,737	50,409	49,051
Consolidated goodwill	48,410		48,410		$ 48,430
Total goodwill disposals			20
Shared services and unallocated costs [Member]
Segment Reporting Information [Line Items]
Consolidated depreciation expense	1,401	1,573	4,936	5,445
Segment Reconciling Items [Member]
Segment Reporting Information [Line Items]
Gains (losses) on the sale of company-operated restaurants	409	(183)	1,224	(4,353)
Corporate, Non-Segment [Member] | Shared services and unallocated costs [Member]
Segment Reporting Information [Line Items]
Consolidated earnings from operations	(28,404)	(25,582)	(82,115)	(84,936)
Operating Segments [Member] | Qdoba brand restaurant operations [Member]
Segment Reporting Information [Line Items]
Consolidated revenues	104,445	96,167	324,774	301,515
Consolidated earnings from operations	14,172	13,805	33,532	37,265
Operating Segments [Member] | Jack in the box brand restaurant operations [Member]
Segment Reporting Information [Line Items]
Consolidated revenues	264,493	263,339	876,138	884,734
Consolidated earnings from operations	$ 69,528	$ 62,355	$ 218,364	$ 207,523

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