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Document And Entity Information - shares	9 Months Ended
	Jun. 26, 2015	Jul. 29, 2015
Document And Entity Information [Abstract]
Entity Registrant Name	JACOBS ENGINEERING GROUP INC /DE/
Trading Symbol	jec
Entity Central Index Key	0000052988
Current Fiscal Year End Date	--10-02
Entity Filer Category	Large Accelerated Filer
Document Type	10-Q
Document Period End Date	Jun. 26, 2015
Document Fiscal Year Focus	2015
Document Fiscal Period Focus	Q3
Amendment Flag	false
Entity Common Stock, Shares Outstanding		123,798,755

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The end date of the period reflected on the cover page if a periodic report. For all other reports and registration statements containing historical data, it is the date up through which that historical data is presented. If there is no historical data in the report, use the filing date. The format of the date is CCYY-MM-DD.

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A unique 10-digit SEC-issued value to identify entities that have filed disclosures with the SEC. It is commonly abbreviated as CIK.

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Reference 1: http://www.xbrl.org/2003/role/presentationRef



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