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Document And Entity Information - shares	3 Months Ended
	Dec. 28, 2018	Jan. 29, 2019
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	--09-27
Entity Filer Category	Large Accelerated Filer
Document Type	10-Q
Document Period End Date	Dec. 28, 2018
Document Fiscal Year Focus	2019
Document Fiscal Period Focus	Q1
Amendment Flag	false
Entity Common Stock, Shares Outstanding (in shares)		139,516,853

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Reference 1: http://www.xbrl.org/2003/role/presentationRef
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-Name Regulation 12B
-Number 240
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-Subsection 1

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