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Document And Entity Information	6 Months Ended
	Mar. 28, 2014	May 01, 2014
Entity Information [Line Items]
Document Type	10-Q
Amendment Flag	false
Document Period End Date	Mar. 28, 2014
Document Fiscal Year Focus	2014
Document Fiscal Period Focus	Q2
Trading Symbol	jec
Entity Registrant Name	JACOBS ENGINEERING GROUP INC /DE/
Entity Central Index Key	0000052988
Current Fiscal Year End Date	--09-26
Entity Filer Category	Large Accelerated Filer
Entity Common Stock, Shares Outstanding		132,263,909

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