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Segment Information - Schedule of Transaction Costs Associated With Acquisition (Parenthetical) (Details) $ in Thousands	3 Months Ended
	Dec. 29, 2017 USD ($)
CH2M HILL Companies, Ltd.
Segment Reporting Information [Line Items]
Deferred financing fees	$ 256

X

- Definition

Business combination deferred financing fees.

+ References

No definition available.

+ Details

Name:	jec_BusinessCombinationDeferredFinancingFees
Namespace Prefix:	jec_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

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

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

X

- Details

Name:	us-gaap_BusinessAcquisitionAxis=jec_CH2MHILLCompaniesLimitedMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type: