Discontinued Operations Reconciliation of Gain on Sale (Details) - USD ($) $ in Thousands		12 Months Ended
		Sep. 30, 2018	Oct. 01, 2017		Oct. 02, 2016
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Net proceeds received from the Qdoba Sale (1)	[1]	$ 298,474
Disposal Group, Including Discontinued Operation, Other Expense	[2]	12,564
Discontinued Operation, Gain (Loss) from Disposal of Discontinued Operation, before Income Tax		30,717
Qdoba [Member]
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Cash		3,113	$ 3,175
Disposal Group, Including Discontinued Operation, Accounts, Notes and Loans Receivable, Net		9,461	9,086
Disposal Group, Including Discontinued Operation, Inventory		3,112	3,202
Disposal Group, Including Discontinued Operation, Prepaid and Other Assets, Current		5,007	8,802
Disposal Group, Including Discontinued Operation, Property, Plant and Equipment		164,075	148,715
Disposal Group, Including Discontinued Operation, Intangible Assets		12,518	12,660
Disposal Group, Including Discontinued Operation, Goodwill		117,636	117,636
Disposal Group, Including Discontinued Operation, Other Assets		2,604	1,785
Disposal Group, Including Discontinued Operation, Assets		317,526	305,061	[3]
Disposal Group, Including Discontinued Operation, Accounts Payable		7,847	8,936
Disposal Group, Including Discontinued Operation, Accrued Liabilities		19,891	25,251
Disposal Group, Including Discontinued Operation, Other Liabilities, Current		180	158
Disposal Group Including Discontinued Operation, Straight-line Rent Accrual		14,595	13,347
Disposal Group, Including Discontinued Operation, Deferred Tax Liabilities		8,676	6,421	[4]
Disposal Group, Including Discontinued Operation, Other Liabilities		11,144	12,310
Disposal Group, Including Discontinued Operation, Liabilities		62,333	66,423
Discontinued Operation, Gain (Loss) from Disposal of Discontinued Operation, before Income Tax		$ 30,717	$ 0		$ 0

[1] (1)The proceeds received from the Qdoba Sale are net of the finalized working capital adjustment outlined in the Qdoba Purchase Agreement totaling $6.9 million, and the derecognition of foreign currency translation adjustments recorded in accumulated other comprehensive income of $0.1 million.

[2] (2)Costs directly incurred as a result of the Qdoba Sale, including investment bank fees, legal fees, professional fees, employee transaction awards, transfer taxes, and other costs.

[3] (1)Current assets held for sale as of October 1, 2017 include Jack in the Box assets held for sale of $18.5 million.

[4] (2)Prior to held for sale presentation, Qdoba’s deferred income tax liability as of January 22, 2017 was netted against the Jack in the Box deferred income tax assets in other assets, net, on our condensed consolidated balance sheet.