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Nature Of Operations And Summary Of Significant Accounting Policies (Narrative) (Details) $ in Thousands | 12 Months Ended
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Oct. 02, 2016 USD ($) restaurant | Sep. 27, 2015 USD ($) restaurant | Sep. 28, 2014 USD ($) restaurant
Nature Of Operations And Summary Of Significant Accounting Policies [Line Items] |  |  |
Unamortized Debt Issuance Expense | $ 8,200 |  |
Deferred Tax Assets, Net, Current |  | $ 40,000 |
General liability and workers' comp estimated claims to be paid by insurance providers | 8,600 | 25,800 |
Assets held for sale and leaseback | 14,259 | 15,216 |
Other property and equipment held for sale | 0 | 300 |
Assets Held-for-sale, Not Part of Disposal Group, Current | $ 14,259 | $ 15,516 |
Fiscal year | 53 | 52 | 52
Depreciation | $ 92,082 | $ 88,778 | $ 90,655
Period of franchise agreement (in years) | P20Y |  |
Revenue recognized on unredeemed gift cards | $ 1,000 | 1,000 | 800
Excess Tax Benefit from Share-based Compensation, Financing Activities | $ 7,461 | $ 18,602 | $ 17,664
Jack in the box brand restaurant operations [Member] |  |  |
Nature Of Operations And Summary Of Significant Accounting Policies [Line Items] |  |  |
Number of Restaurants | restaurant | 2,255 | 2,249 | 2,250
Marketing funds including contractual contributions | 5.00% | 5.00% | 5.00%
Qdoba brand restaurant operations [Member] |  |  |
Nature Of Operations And Summary Of Significant Accounting Policies [Line Items] |  |  |
Number of Restaurants | restaurant | 699 | 661 | 638
Marketing funds including contractual contributions | 2.00% | 2.00% | 1.00%
Minimum [Member] |  |  |
Nature Of Operations And Summary Of Significant Accounting Policies [Line Items] |  |  |
Property, plant and equipment assigned lives | 1 year |  |
Maximum [Member] |  |  |
Nature Of Operations And Summary Of Significant Accounting Policies [Line Items] |  |  |
Property, plant and equipment assigned lives | 35 years |  |
Other Assets [Member] |  |  |
Nature Of Operations And Summary Of Significant Accounting Policies [Line Items] |  |  |
Cash surrender value of policy | $ 106,000 | $ 99,500 |

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- Definition Contractual Contributions Towards Advertising Costs Percentage Of Sales + References No definition available. + Details
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- Definition General liability and workers' comp estimated claims to be paid on the Company's behalf by our insurance providers + References No definition available. + Details
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- Definition Amount of assets held-for-sale that are not part of a disposal group, expected to be sold within a year or the normal operating cycle, if longer. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 360 -SubTopic 10 -Section 15 -Paragraph 4 -Subparagraph (b)(2) -URI http://asc.fasb.org/extlink&oid=6390208&loc=d3e400-110220 + Details
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- Definition The amount of breakage recognized related to unredeemed gift cards. Breakage occurs when a customer pays in advance of vendor performance and does not demand full performance for various reasons. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 605 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SAB TOPIC 13.B.Q1) -URI http://asc.fasb.org/extlink&oid=65893310&loc=d3e214044-122780 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 235 -SubTopic 10 -Section 50 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=68058157&loc=d3e18780-107790 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Breakage -URI http://asc.fasb.org/extlink&oid=51574696 + Details
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