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REVENUE - Narrative (Details) $ in Thousands	9 Months Ended
	Jul. 10, 2022 USD ($)
Revenue from Contract with Customer [Abstract]
Term of franchise	20 years
Development fees	$ 5,200

X

- Definition

Contract With Customer, Liability, Development Fees For Unopened Stores

+ References

No definition available.

+ Details

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

X

- Definition

Contract With Customer, Liability, Initial Franchise Fees, Term

+ References

No definition available.

+ Details

Name:	jack_ContractWithCustomerLiabilityInitialFranchiseFeesTerm
Namespace Prefix:	jack_
Data Type:	xbrli:durationItemType
Balance Type:	na
Period Type:	duration

X

- References

No definition available.

+ Details

Name:	us-gaap_RevenueFromContractWithCustomerAbstract
Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration