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Segment Reporting (Summarized Financial Information Of Reportable Segments) (Details) - USD ($) $ in Thousands	3 Months Ended						4 Months Ended		12 Months Ended
	Oct. 01, 2017	Jul. 09, 2017	Apr. 16, 2017	Oct. 02, 2016	Jul. 03, 2016	Apr. 10, 2016	Jan. 22, 2017	Jan. 17, 2016	Oct. 01, 2017	Oct. 02, 2016	Sep. 27, 2015
Segment Reporting Information [Line Items]
Consolidated revenues	$ 338,746	$ 357,846	$ 369,389	$ 398,419	$ 368,938	$ 361,151	$ 487,933	$ 470,823	$ 1,553,914	$ 1,599,331	$ 1,540,317
Consolidated earnings from operations	$ 60,393	$ 66,981	$ 65,650	$ 58,910	$ 55,705	$ 52,786	$ 73,117	$ 62,514	266,141	229,915	197,173
Gains (losses) on the sale of company-operated restaurants									38,034	1,230	(3,139)
Interest expense, net									46,518	31,081	18,803
Income (Loss) from Continuing Operations before Income Taxes, Extraordinary Items, Noncontrolling Interest									219,623	198,834	178,370
Expenditures for long-lived assets by segment									67,453	96,615	86,226
Consolidated depreciation expense									88,210	92,082	88,778
Operating Segments [Member] | Jack in the box brand restaurant operations [Member]
Segment Reporting Information [Line Items]
Consolidated revenues									1,097,291	1,162,258	1,145,176
Consolidated earnings from operations									280,097	290,346	265,230
Expenditures for long-lived assets by segment									29,426	38,607	41,928
Consolidated depreciation expense									60,595	66,287	64,597
Operating Segments [Member] | Qdoba brand restaurant operations [Member]
Segment Reporting Information [Line Items]
Consolidated revenues									456,623	437,073	395,141
Consolidated earnings from operations									31,031	47,250	47,264
Expenditures for long-lived assets by segment									34,163	53,316	34,071
Consolidated depreciation expense									20,854	19,306	17,103
Corporate, Non-Segment [Member] | Shared services and unallocated costs [Member]
Segment Reporting Information [Line Items]
Consolidated earnings from operations									(83,021)	(108,911)	(112,182)
Expenditures for long-lived assets by segment									3,864	4,692	10,227
Consolidated depreciation expense									6,761	6,489	7,078
Segment Reconciling Items [Member]
Segment Reporting Information [Line Items]
Gains (losses) on the sale of company-operated restaurants									$ 38,034	$ 1,230	$ (3,139)

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