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Leases (Assets Recorded Under Finance Leases) (Details) - USD ($) $ in Thousands	Sep. 27, 2020	Sep. 29, 2019
Property, plant and Equipment [Line Items]
Less accumulated amortization	$ (4,640)	$ (3,904)
Finance Lease, Right-of-Use Asset	2,333	2,976
Buildings
Property, plant and Equipment [Line Items]
Finance lease, right-of-use asset before amortization	1,342	1,342
Equipment
Property, plant and Equipment [Line Items]
Finance lease, right-of-use asset before amortization	$ 5,631	$ 5,538

X

- Definition

Finance Lease, Right-of-Use Asset, Accumulated Amortization

+ References

No definition available.

+ Details

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Namespace Prefix:	jack_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

X

- Definition

Finance Lease, Right-of-Use Asset, Gross

+ References

No definition available.

+ Details

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Namespace Prefix:	jack_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

X

- Definition

Amount of lessee's right to use underlying asset under finance lease.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 842
-SubTopic 20
-Section 45
-Paragraph 1
-Subparagraph (a)
-URI http://asc.fasb.org/extlink&oid=77888419&loc=SL77918627-209977

+ Details

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Balance Type:	debit
Period Type:	instant

X

- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

+ References

No definition available.

+ Details

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- Details

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Balance Type:
Period Type:

X

- Details

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Period Type: