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Nature Of Operations And Summary Of Significant Accounting Policies (Summary Of Number Of Restaurants) (Details) - restaurant | Oct. 02, 2016 | Sep. 27, 2015 | Sep. 28, 2014
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Jack in the box brand restaurant operations [Member] |  |  |
Nature Of Operations And Summary Of Significant Accounting Policies [Line Items] |  |  |
Number of Restaurants | 2,255 | 2,249 | 2,250
Qdoba brand restaurant operations [Member] |  |  |
Nature Of Operations And Summary Of Significant Accounting Policies [Line Items] |  |  |
Number of Restaurants | 699 | 661 | 638
Company-Operated [Member] | Jack in the box brand restaurant operations [Member] |  |  |
Nature Of Operations And Summary Of Significant Accounting Policies [Line Items] |  |  |
Number of Restaurants | 417 | 413 | 431
Company-Operated [Member] | Qdoba brand restaurant operations [Member] |  |  |
Nature Of Operations And Summary Of Significant Accounting Policies [Line Items] |  |  |
Number of Restaurants | 367 | 322 | 310
Franchise [Member] | Jack in the box brand restaurant operations [Member] |  |  |
Nature Of Operations And Summary Of Significant Accounting Policies [Line Items] |  |  |
Number of Restaurants | 1,838 | 1,836 | 1,819
Franchise [Member] | Qdoba brand restaurant operations [Member] |  |  |
Nature Of Operations And Summary Of Significant Accounting Policies [Line Items] |  |  |
Number of Restaurants | 332 | 339 | 328

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