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Impairment, Disposition Of Property And Equipment, And Restaurant Closing Costs (Impairment And Disposal Costs Included In Impairment And Other Charges) (Details) $ in Thousands		12 Months Ended
		Sep. 30, 2018 USD ($) restaurant	Oct. 01, 2017 USD ($) restaurant	Oct. 02, 2016 USD ($) restaurant
Impairment, Disposition of Property and Equipment, and Restaurant Closing Costs [Line Items]
Document Fiscal Year Focus		2018
Business Exit Costs		$ 4,803	$ 5,736	$ 2,457
Impairment of Long-Lived Assets Held-for-use	[1]	$ 211	0	0
Number of Restaurants | restaurant		10
Restructuring Costs		$ 10,647	3,631	3,531
Accelerated depreciation		1,130	911	1,543
Gain (Loss) on Disposition of Property Plant Equipment		(1,627)	(2,891)	(2,280)
Impairment And Other Costs Net		18,418	13,169	9,929
Continuing Operations [Member]
Impairment, Disposition of Property and Equipment, and Restaurant Closing Costs [Line Items]
Gain (Loss) on Disposition of Property Plant Equipment		$ 1,627	$ 2,891	$ 2,398
Jack in the box brand restaurant operations [Member]
Impairment, Disposition of Property and Equipment, and Restaurant Closing Costs [Line Items]
Number of Restaurants | restaurant		2,237	2,251	2,255
[1] (1)In 2018, impairment charges relate to our landlord’s sale of a restaurant property to a franchisee.

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Amount of accelerated depreciation recognized in the period due to a long-lived asset being replaced or disposed of prior to the end of its useful life. Not associated with a disposal group or restructuring.

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Includes the charge against earnings resulting from accelerated depreciation, the aggregate of write down of assets from their carrying value to their fair value, lease reserves established when we cease using a property under an operating lease and subsequent adjustments to those reserves and other facility-related expenses from previously closed stores, as well as the net gain or loss on sales of real estate on which we formerly operated a Company restaurant that was closed. Also included within this balance are restructuring costs.

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Impairment, disposition of property and equipment, and restaurant closing costs [Line Items]

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Amount of write-down of assets recognized in the income statement. Includes, but is not limited to, losses from tangible assets, intangible assets and goodwill.

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Amount of expenses associated with exit or disposal activities pursuant to an authorized plan. Includes, but is not limited to, one-time termination benefits, termination of an operating lease or other contract, consolidating or closing facilities, and relocating employees, and termination benefits associated with an ongoing benefit arrangement. Excludes expenses associated with special or contractual termination benefits, a discontinued operation or an asset retirement obligation.

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Amount of gain (loss) on sale or disposal of property, plant and equipment assets, including oil and gas property and timber property.

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Represents the number of restaurants.

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Amount, after cash payment, of expenses associated with exit or disposal activities pursuant to an authorized plan. Excludes expenses related to a discontinued operation or an asset retirement obligation.

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