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Segment Information - Schedule of Total Revenues, Operating Profit and Total Asset for Reporting Segment (Parenthetical) (Details) - USD ($) $ in Thousands	3 Months Ended	12 Months Ended
	Dec. 30, 2016	Sep. 29, 2017	Sep. 30, 2016	Oct. 02, 2015
Segment Reporting Information [Line Items]
Restructuring and other charges	$ 31,700	$ 134,206	$ 187,630	$ 154,283
Other Expense
Segment Reporting Information [Line Items]
Restructuring and other charges		1,233	$ 277
Buildings & Infrastructure
Segment Reporting Information [Line Items]
Restructuring and other charges		$ 23,844

X

- Definition

Restructuring and other charges.

+ References

No definition available.

+ Details

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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_IncomeStatementLocationAxis=us-gaap_OtherExpenseMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_StatementBusinessSegmentsAxis=jec_BuildingsAndInfrastructureMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type: