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Nature Of Operations And Summary Of Significant Accounting Policies (Summary Of Advertising Costs) (Details) - USD ($) $ in Thousands | 12 Months Ended
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Oct. 02, 2016 | Sep. 27, 2015 | Sep. 28, 2014
Nature Of Operations And Summary Of Significant Accounting Policies [Line Items] |  |  |
Advertising costs | $ 61,677 | $ 59,582 | $ 60,564
Jack in the box brand restaurant operations [Member] |  |  |
Nature Of Operations And Summary Of Significant Accounting Policies [Line Items] |  |  |
Advertising costs | 41,189 | 41,895 | 42,349
Qdoba brand restaurant operations [Member] |  |  |
Nature Of Operations And Summary Of Significant Accounting Policies [Line Items] |  |  |
Advertising costs | $ 20,488 | $ 17,687 | $ 18,215

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- Definition Nature Of Operations And Summary Of Significant Accounting Policies [Line Items] + References No definition available. + Details
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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://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 225 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SX 210.5-03.4) -URI http://asc.fasb.org/extlink&oid=63488584&loc=d3e20235-122688 + Details
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