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Business Combinations (Pro Forma Consolidated Results Of Operations) (Details) (USD $) In Thousands	12 Months Ended
	Sep. 30, 2011	Oct. 01, 2010
Business Combinations
Revenues	$ 10,733,797	$ 10,633,975
Net earnings attributable to Jacobs	$ 339,437	$ 262,114

X

- Definition

The pro forma net Income or Loss for the period as if the business combination or combinations had been completed at the beginning of a period.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 805

-SubTopic 10

-Section 50

-Paragraph 2

-Subparagraph (h)(2)-(3)

-URI http://asc.fasb.org/extlink&oid=6909870&loc=d3e1392-128463

+ Details

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Namespace Prefix:	us-gaap
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Balance Type:	credit
Period Type:	duration

X

- Definition

The pro forma revenue for a period as if the business combination or combinations had been completed at the beginning of the period.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 805

-SubTopic 10

-Section 50

-Paragraph 2

-Subparagraph (h)(2)-(3)

-URI http://asc.fasb.org/extlink&oid=6909870&loc=d3e1392-128463

+ Details

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Namespace Prefix:	us-gaap
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Balance Type:	credit
Period Type:	duration

X

- Details

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Namespace Prefix:	us-gaap
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Balance Type:	na
Period Type:	duration