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Basis Of Presentation (Details) $ in Thousands | 6 Months Ended |
--- | --- | ---
Apr. 16, 2017 USD ($) restaurant | Apr. 10, 2016 USD ($) restaurant | Oct. 02, 2016 USD ($)
Nature Of Operations And Summary Of Significant Accounting Policies [Line Items] |  |  |
Adjustments to Additional Paid in Capital, Income Tax Benefit from Share-based Compensation | $ | $ 4,000 |  |
Defined Benefit Plan, Net Periodic Benefit Cost Excluding Service Cost | $ | $ 1,100 | $ 4,400 |
Jack in the box brand restaurant operations [Member] |  |  |
Nature Of Operations And Summary Of Significant Accounting Policies [Line Items] |  |  |
Number of restaurants | 2,260 | 2,251 |
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 | 371 | 413 |
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 | 1,889 | 1,838 |
Qdoba brand restaurant operations [Member] |  |  |
Nature Of Operations And Summary Of Significant Accounting Policies [Line Items] |  |  |
Number of restaurants | 717 | 683 |
Qdoba brand restaurant operations [Member] | Entity Operated Units [Member] |  |  |
Nature Of Operations And Summary Of Significant Accounting Policies [Line Items] |  |  |
Number of restaurants | 377 | 338 |
Qdoba brand restaurant operations [Member] | Franchised Units [Member] |  |  |
Nature Of Operations And Summary Of Significant Accounting Policies [Line Items] |  |  |
Number of restaurants | 340 | 345 |
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

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