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Document And Entity Information	3 Months Ended
	Dec. 30, 2011	Jan. 20, 2012
Entity Information [Line Items]
Document Type	10-Q
Amendment Flag	false
Document Period End Date	Dec. 30, 2011
Document Fiscal Year Focus	2012
Document Fiscal Period Focus	Q1
Trading Symbol	jec
Entity Registrant Name	JACOBS ENGINEERING GROUP INC /DE/
Entity Central Index Key	0000052988
Current Fiscal Year End Date	--09-28
Entity Filer Category	Large Accelerated Filer
Entity Common Stock, Shares Outstanding		128,493,619

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