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Nature Of Operations And Summary Of Significant Accounting Policies (Summary Of Advertising Costs) (Details) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Sep. 30, 2018 | Oct. 01, 2017 | Oct. 02, 2016
Nature Of Operations And Summary Of Significant Accounting Policies [Line Items] |  |  |
Marketing and Advertising Expense | $ 28.8 | $ 36.5 | $ 41.2
Current Fiscal Year End Date | --09-30 |  |
Document Fiscal Year Focus | 2018 |  |
ContractualContributionsTowardsAdvertisingCostsPercentageOfSales | 5.00% |  |
Marketing Expense | $ 6.2 | $ 0.5 | $ 1.1
Jack in the box brand restaurant operations [Member] |  |  |
Nature Of Operations And Summary Of Significant Accounting Policies [Line Items] |  |  |
ContractualContributionsTowardsAdvertisingCostsPercentageOfSales |  |  | 5.00%
Qdoba brand restaurant operations [Member] |  |  |
Nature Of Operations And Summary Of Significant Accounting Policies [Line Items] |  |  |
ContractualContributionsTowardsAdvertisingCostsPercentageOfSales |  |  | 2.00%

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- Definition The total expense recognized in the period for promotion, public relations, and brand or product advertising. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SX 210.5-03.4) -URI http://asc.fasb.org/extlink&oid=115205541&loc=SL114868664-224227 + Details
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- Definition Expenditures for planning and executing the conception, pricing, promotion, and distribution of ideas, goods, and services. Costs of public relations and corporate promotions are typically considered to be marketing costs. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SX 210.5-03.4) -URI http://asc.fasb.org/extlink&oid=115205541&loc=SL114868664-224227 + Details
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