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Goodwill And Intangible Assets (Changes in Carrying Amount of Goodwill) (Details) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Oct. 02, 2022 | Oct. 03, 2021
Goodwill [Roll Forward] |  |
Goodwill, beginning balance | $ 47,774 | $ 47,161
Goodwill, acquired during period |  | 613
Sale of Jack in the Box company-operated restaurants to franchisees |  | (948)
Goodwill, ending balance | 366,821 | 47,774
Jack in the Box |  |
Goodwill [Roll Forward] |  |
Goodwill, acquired during period |  | 273
Del Taco |  |
Goodwill [Roll Forward] |  |
Goodwill, acquired during period | 319,722 |
Goodwill, ending balance | 319,722 |
Jack in the Box |  |
Goodwill [Roll Forward] |  |
Goodwill, beginning balance | 47,774 | 47,161
Goodwill, acquired during period |  | 613
Sale of Jack in the Box company-operated restaurants to franchisees |  | (948)
Goodwill, ending balance | 136,099 | 47,774
Jack in the Box | Jack in the Box |  |
Goodwill [Roll Forward] |  |
Goodwill, acquired during period |  | 273
Jack in the Box | Del Taco |  |
Goodwill [Roll Forward] |  |
Goodwill, acquired during period | 89,000 |
Del Taco |  |
Goodwill [Roll Forward] |  |
Goodwill, beginning balance | 0 | 0
Goodwill, acquired during period |  | 0
Sale of Jack in the Box company-operated restaurants to franchisees |  | 0
Goodwill, ending balance | 230,722 | 0
Del Taco | Jack in the Box |  |
Goodwill [Roll Forward] |  |
Goodwill, acquired during period |  | $ 0
Del Taco | Del Taco |  |
Goodwill [Roll Forward] |  |
Goodwill, acquired during period | $ 230,722 |

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- Definition Amount after accumulated impairment loss of an asset representing future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03(10)(1)) -URI http://asc.fasb.org/extlink&oid=120398452&loc=d3e534808-122878 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 20 -Section 45 -Paragraph 5 -URI http://asc.fasb.org/extlink&oid=120320667&loc=SL49117168-202975 Reference 3: http://www.xbrl.org/2003/role/exampleRef -Publisher FASB -Name Accounting Standards Codification -Topic 852 -SubTopic 10 -Section 55 -Paragraph 10 -URI http://asc.fasb.org/extlink&oid=84165509&loc=d3e56426-112766 Reference 4: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 20 -Section 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=99380562&loc=d3e13770-109266 + Details
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- Definition Amount of increase in asset representing future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized resulting from a business combination. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=121556970&loc=d3e13816-109267 + Details
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- Definition Amount of divestiture of an asset representing future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (d) -URI http://asc.fasb.org/extlink&oid=121556970&loc=d3e13816-109267 + Details
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