XML 64 R52.htm IDEA: XBRL DOCUMENT
v3.5.0.2

Contingencies and Legal Matters (Details) - USD ($) $ in Millions | 9 Months Ended |
--- | --- | ---
Jul. 03, 2016 | Sep. 27, 2015
Legal Matters and Contingencies [Abstract] |  |
Loss Contingency, Damages Sought, Value | $ 45.0 |
General liability and workers' comp estimated claims to be paid by insurance providers |  | $ 25.8
Legal Judgment Paid by our Insurance Providers | $ 21.7 |

X
- Definition General liability and workers' comp estimated claims to be paid on the Company's behalf by our insurance providers + References No definition available. + Details
Name: | jack_Generalliabilityandworkerscompestimatedclaimstobepaidbyinsuranceproviders
Namespace Prefix: | jack_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition Legal Judgment Paid by our Insurance Providers, as covered under our self-insurance policies. + References No definition available. + Details
Name: | jack_LegalJudgmentPaidbyourInsuranceProviders
Namespace Prefix: | jack_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition Legal Matters and Contingencies [Abstract] + References No definition available. + Details
Name: | jack_LegalMattersandContingenciesAbstract
Namespace Prefix: | jack_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Definition The value (monetary amount) of the award the plaintiff seeks in the legal matter. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 450 -SubTopic 20 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=25496072&loc=d3e14326-108349 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 450 -SubTopic 20 -Section 50 -Paragraph 9 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=25496072&loc=d3e14557-108349 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 450 -SubTopic 20 -Section 50 -Paragraph 4 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=25496072&loc=d3e14435-108349 + Details
Name: | us-gaap_LossContingencyDamagesSoughtValue
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration