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Summary Of Refranchisings, Franchisee Development And Acquisitions (Number Of Restaurants Sold And Developed By Franchisees And Related Gains And Fees Recognized) (Details) | 3 Months Ended | 6 Months Ended
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Apr. 16, 2017 USD ($) restaurant | Apr. 10, 2016 USD ($) restaurant | Apr. 16, 2017 USD ($) restaurant | Apr. 10, 2016 USD ($) restaurant
Summary Of Refranchisings, Franchisee Development And Acquisitions [Line Items] |  |  |  |  |
Initial franchise fees |  | $ 2,577,000 | $ 120,000 | $ 3,002,000 | $ 505,000
Proceeds from the sale of company-operated restaurants (1) |  |  |  | 31,389,000 | 1,021,000
Gains (losses) on the sale of company-operated restaurants |  | $ 7,779,000 | $ (3,000) | $ 7,916,000 | $ 815,000
Jack in the box brand restaurant operations [Member] |  |  |  |  |
Summary Of Refranchisings, Franchisee Development And Acquisitions [Line Items] |  |  |  |  |
Restaurants sold to Jack in the Box franchisees | restaurant |  | 60 | 0 | 60 | 1
New restaurants opened by franchisees: | restaurant |  | 6 | 0 | 13 | 5
Proceeds from the sale of company-operated restaurants (1) | [1] | $ 31,251,000 | $ 0 | $ 31,389,000 | $ 1,021,000
Net assets sold (primarily property and equipment) |  | 10,306,000 | 3,000 | 10,306,000 | 196,000
Goodwill related to the sale of company-operated restaurants |  | (341,000) | 0 | (342,000) | (10,000)
Other (3) | [2] | (5,174,000) | 0 | (5,174,000) | 0
Gains (losses) on the sale of company-operated restaurants |  | $ 7,779,000 | $ (3,000) | 7,916,000 | 815,000
Proceeds From Extension Of Franchise And Lease Agreements |  |  |  | $ 100,000 | $ 1,000,000
Number of Restaurants | restaurant |  | 2,260 | 2,251 | 2,260 | 2,251
Jack in the box brand restaurant operations [Member] | Equipment [Member] |  |  |  |  |
Summary Of Refranchisings, Franchisee Development And Acquisitions [Line Items] |  |  |  |  |
Assets Held For Sale And LeaseBack |  | $ 9,400,000 |  | $ 9,400,000 |
Jack in the box brand restaurant operations [Member] | Minimum [Member] |  |  |  |  |
Summary Of Refranchisings, Franchisee Development And Acquisitions [Line Items] |  |  |  |  |
Proceeds from Sale of Franchisees |  |  |  | 30,000,000 |
Jack in the box brand restaurant operations [Member] | Maximum [Member] |  |  |  |  |
Summary Of Refranchisings, Franchisee Development And Acquisitions [Line Items] |  |  |  |  |
Proceeds from Sale of Franchisees |  |  |  | $ 33,000,000 |
Qdoba brand restaurant operations [Member] |  |  |  |  |
Summary Of Refranchisings, Franchisee Development And Acquisitions [Line Items] |  |  |  |  |
New restaurants opened by franchisees: | restaurant |  | 4 | 4 | 12 | 10
Number of Restaurants | restaurant |  | 717 | 683 | 717 | 683
Disposal Group, Disposed of by Sale, Not Discontinued Operations [Member] | Jack in the box brand restaurant operations [Member] |  |  |  |  |
Summary Of Refranchisings, Franchisee Development And Acquisitions [Line Items] |  |  |  |  |
Lease commitment charges (2) | [3] | $ (7,651,000) | $ 0 | $ (7,651,000) | $ 0
Disposal Group, Disposed of by Sale, Not Discontinued Operations [Member] | Sale of related markets [Member] | Jack in the box brand restaurant operations [Member] |  |  |  |  |
Summary Of Refranchisings, Franchisee Development And Acquisitions [Line Items] |  |  |  |  |
Impairment Charges and Other |  |  |  | 3,100,000 |
Impairment of Long-Lived Assets to be Disposed of |  |  |  | 1,400,000 |
Disposal Group, Held-for-sale, Not Discontinued Operations [Member] | Jack in the box brand restaurant operations [Member] |  |  |  |  |
Summary Of Refranchisings, Franchisee Development And Acquisitions [Line Items] |  |  |  |  |
Assets Held For Sale And LeaseBack |  | $ 8,800,000 |  | $ 8,800,000 |
Number of Restaurants | restaurant |  | 59 |  | 59 |
[1] | (1)Year-to-date, amounts in 2017 and 2016 include additional proceeds related to restaurants sold in a prior year of $0.1 million and $1.0 million, respectively. An immaterial amount of additional proceeds, and no additional proceeds, were recognized during the quarter in 2017 and 2016, respectively.
[2] | (3)Amounts in 2017 primarily represent impairment of $3.1 million and equipment write-offs of $1.4 million related to restaurants closed in connection with the sale of the related markets. As of April 16, 2017, there was $8.8 million of property related to these closed restaurants classified as assets held for sale on our condensed consolidated balance sheet.
[3] | (2)Charges are for operating restaurant leases with lease commitments in excess of our sublease rental income.

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