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Segment Reporting (Summarized Financial Information Of Reportable Segments) (Details) - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended |
--- | --- | --- | ---
Apr. 16, 2017 | Apr. 10, 2016 | Apr. 16, 2017 | Apr. 10, 2016 | Oct. 02, 2016
Segment Reporting Information [Line Items] |  |  |  |  |
Consolidated revenues | $ 369,389 | $ 361,151 | $ 857,322 | $ 831,974 |
Consolidated earnings from operations | 65,650 | 52,786 | 138,767 | 115,300 |
Gains (losses) on the sale of company-operated restaurants | 7,779 | (3) | 7,916 | 815 |
Interest expense, net | 10,941 | 6,911 | 23,658 | 15,086 |
Consolidated earnings from continuing operations and before income taxes | 54,709 | 45,875 | 115,109 | 100,214 |
Consolidated depreciation expense | 21,030 | 20,648 | 48,785 | 48,934 |
Sale of company-operated restaurants to franchisees |  |  | 342 |  |
Goodwill (gain on bargain purchase) |  |  | 9,821 |  |
Goodwill | 175,525 |  | 175,525 |  | $ 166,046
Jack in the box brand restaurant operations [Member] |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Gains (losses) on the sale of company-operated restaurants | 7,779 | (3) | 7,916 | 815 |
Sale of company-operated restaurants to franchisees |  |  | 342 |  |
Goodwill (gain on bargain purchase) |  |  | 9,821 |  |
Goodwill | 57,894 |  | 57,894 |  | 48,415
Qdoba brand restaurant operations [Member] |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Sale of company-operated restaurants to franchisees |  |  | 0 |  |
Goodwill (gain on bargain purchase) |  |  | 0 |  |
Goodwill | 117,631 |  | 117,631 |  | $ 117,631
Operating Segments [Member] | Jack in the box brand restaurant operations [Member] |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Consolidated revenues | 265,884 | 264,062 | 619,065 | 611,645 |
Consolidated earnings from operations | 68,658 | 63,146 | 161,062 | 148,836 |
Consolidated depreciation expense | 14,483 | 15,059 | 33,772 | 35,532 |
Operating Segments [Member] | Qdoba brand restaurant operations [Member] |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Consolidated revenues | 103,505 | 97,089 | 238,257 | 220,329 |
Consolidated earnings from operations | 8,489 | 10,623 | 17,221 | 19,360 |
Consolidated depreciation expense | 4,907 | 4,279 | 11,399 | 9,867 |
Corporate, Non-Segment [Member] | Shared services and unallocated costs [Member] |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Consolidated earnings from operations | (19,276) | (20,980) | (47,432) | (53,711) |
Consolidated depreciation expense | 1,640 | 1,310 | 3,614 | 3,535 |
Segment Reconciling Items [Member] |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Gains (losses) on the sale of company-operated restaurants | 7,779 | (3) | 7,916 | 815 |
Interest expense, net | $ 10,941 | $ 6,911 | $ 23,658 | $ 15,086 |

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