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Subsequent Events (Details) $ / shares in Units, $ in Millions	2 Months Ended	3 Months Ended			4 Months Ended		12 Months Ended
	Nov. 29, 2017 USD ($) restaurant	Oct. 01, 2017 restaurant $ / shares	Jul. 09, 2017 $ / shares	Apr. 16, 2017 $ / shares	Jan. 21, 2018 $ / shares	Jan. 22, 2017 $ / shares	Oct. 01, 2017 restaurant $ / shares	Oct. 02, 2016 restaurant $ / shares	Sep. 27, 2015 restaurant $ / shares
Subsequent Event [Line Items]
Common Stock, Dividends, Per Share, Declared | $ / shares		$ 0.40	$ 0.40	$ 0.40		$ 0.40	$ 1.60	$ 1.20	$ 1.00
Subsequent Event [Member]
Subsequent Event [Line Items]
Common Stock, Dividends, Per Share, Declared | $ / shares					$ 0.40
Jack in the box brand restaurant operations [Member]
Subsequent Event [Line Items]
Number of Restaurants | restaurant		2,251					2,251	2,255	2,249
Disposal Group, Held-for-sale, Not Discontinued Operations [Member] | Jack in the box brand restaurant operations [Member] | Subsequent Event [Member]
Subsequent Event [Line Items]
Number of Restaurants | restaurant	21
Minimum [Member] | Jack in the box brand restaurant operations [Member] | Subsequent Event [Member]
Subsequent Event [Line Items]
Estimated Pre-Tax Proceeds from Sale to Franchisees | $	$ 12.0
Maximum [Member] | Jack in the box brand restaurant operations [Member] | Subsequent Event [Member]
Subsequent Event [Line Items]
Estimated Pre-Tax Proceeds from Sale to Franchisees | $	$ 13.0

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- Definition

Estimated Pre-Tax Proceeds from Sale to Franchisees

+ References

No definition available.

+ Details

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- Definition

Aggregate dividends declared during the period for each share of common stock outstanding.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 505
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.3-04)
-URI http://asc.fasb.org/extlink&oid=27012166&loc=d3e187085-122770

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- Definition

Represents the number of restaurants.

+ References

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- Definition

Detail information of subsequent event by type. User is expected to use existing line items from elsewhere in the taxonomy as the primary line items for this disclosure, which is further associated with dimension and member elements pertaining to a subsequent event.

+ References

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