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Goodwill and Intangibles - Schedule of Carrying Value of Goodwill by Reportable Segment Appearing in Accompanying Consolidated Balance Sheets (Details) $ in Thousands	3 Months Ended
	Dec. 28, 2018 USD ($)
Goodwill [Roll Forward]
September 28, 2018	$ 4,795,856
Post-Acquisition Adjustments	(14,000)
Foreign Exchange Impact	(11,000)
December 28, 2018	4,771,086
Aerospace, Technology and Nuclear
Goodwill [Roll Forward]
September 28, 2018	1,581,000
Post-Acquisition Adjustments	(10,000)
Foreign Exchange Impact	(4,000)
December 28, 2018	1,567,000
Buildings, Infrastructure and Advanced Facilities
Goodwill [Roll Forward]
September 28, 2018	3,215,000
Post-Acquisition Adjustments	(4,000)
Foreign Exchange Impact	(7,000)
December 28, 2018	$ 3,204,000

X

- Definition

Goodwill, Adjustments During Period

+ References

No definition available.

+ Details

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Namespace Prefix:	jec_
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Balance Type:	debit
Period Type:	duration

X

- Definition

Amount after accumulated impairment loss of an asset representing future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 350
-SubTopic 20
-Section 50
-Paragraph 1
-Subparagraph (a)
-URI http://asc.fasb.org/extlink&oid=35741047&loc=d3e13816-109267

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 350
-SubTopic 20
-Section 45
-Paragraph 1
-URI http://asc.fasb.org/extlink&oid=6388280&loc=d3e13770-109266

Reference 3: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 350
-SubTopic 20
-Section 45
-Paragraph 5
-URI http://asc.fasb.org/extlink&oid=77989000&loc=SL49117168-202975

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X

- Definition

Amount of foreign currency translation gain (loss) which increases (decreases) an asset representing future economic benefits from other assets acquired in a business combination that are not individually identified and separately recognized.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 350
-SubTopic 20
-Section 50
-Paragraph 1
-Subparagraph (f)
-URI http://asc.fasb.org/extlink&oid=35741047&loc=d3e13816-109267

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X

- Definition

A roll forward is a reconciliation of a concept from the beginning of a period to the end of a period.

+ References

No definition available.

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