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Basis Of Presentation (Details) $ in Thousands | 9 Months Ended |
--- | --- | ---
Jul. 09, 2017 USD ($) restaurant | Jul. 03, 2016 USD ($) restaurant | Oct. 02, 2016 USD ($)
Nature Of Operations And Summary Of Significant Accounting Policies [Line Items] |  |  |
Excess Tax Benefit from Share-based Compensation, Financing Activities | $ | $ 4,133 | $ 3,822 |
Defined Benefit Plan, Net Periodic Benefit Cost Excluding Service Cost | $ | $ 1,600 | $ 6,300 |
Current Maturities of Long-Term Debt [Member] |  |  |
Nature Of Operations And Summary Of Significant Accounting Policies [Line Items] |  |  |
Unamortized Debt Issuance Expense | $ |  |  | $ 1,600
Long-Term Debt, Net of Current Maturities [Member] |  |  |
Nature Of Operations And Summary Of Significant Accounting Policies [Line Items] |  |  |
Unamortized Debt Issuance Expense | $ |  |  | 2,200
Term Loan [Member] |  |  |
Nature Of Operations And Summary Of Significant Accounting Policies [Line Items] |  |  |
Unamortized Debt Issuance Expense | $ |  |  | $ 3,800
Jack in the box brand restaurant operations [Member] |  |  |
Nature Of Operations And Summary Of Significant Accounting Policies [Line Items] |  |  |
Number of restaurants | 2,255 | 2,254 |
Jack in the box brand restaurant operations [Member] | Entity Operated Units [Member] |  |  |
Nature Of Operations And Summary Of Significant Accounting Policies [Line Items] |  |  |
Number of restaurants | 340 | 415 |
Jack in the box brand restaurant operations [Member] | Franchised Units [Member] |  |  |
Nature Of Operations And Summary Of Significant Accounting Policies [Line Items] |  |  |
Number of restaurants | 1,915 | 1,839 |
Qdoba brand restaurant operations [Member] |  |  |
Nature Of Operations And Summary Of Significant Accounting Policies [Line Items] |  |  |
Number of restaurants | 720 | 688 |
Qdoba brand restaurant operations [Member] | Entity Operated Units [Member] |  |  |
Nature Of Operations And Summary Of Significant Accounting Policies [Line Items] |  |  |
Number of restaurants | 381 | 344 |
Qdoba brand restaurant operations [Member] | Franchised Units [Member] |  |  |
Nature Of Operations And Summary Of Significant Accounting Policies [Line Items] |  |  |
Number of restaurants | 339 | 344 |
Discontinued Operations [Member] | 2013 Qdoba Closures [Member] |  |  |
Nature Of Operations And Summary Of Significant Accounting Policies [Line Items] |  |  |
Number of restaurants | 62 |  |

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