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Commitments and Contingencies (Details) (USD $) In Millions, unless otherwise specified |  | 33 Months Ended |
--- | --- | --- | ---
Mar. 28, 2014 Natural Gas Explosion at ConAgra Foods Plant [Member] claim | Sep. 30, 2012 In Arbitration Litigation [Member] Clark County Nevada Against Jacobs Engineering Group, Inc. [Member] | Jan. 20, 2010 In Arbitration Litigation [Member] Clark County Nevada Against Jacobs Engineering Group, Inc. [Member] subsidiary
Loss Contingencies [Line Items] |  |  |
Number of subsidiaries |  |  | 2
Third party payment of litigation settlement and awards (more than $60 million) |  | $ 60 |
Loss Contingency, Pending Claims, Number | 1 |  |

X
- Definition Litigation Settlement, Third Party Payment Of Settlement And Awards, Amount + References No definition available. + Details
Name: | jec_LitigationSettlementThirdPartyPaymentOfSettlementAndAwardsAmount
Namespace Prefix: | jec_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition Number Of Subsidiaries + References No definition available. + Details
Name: | jec_NumberOfSubsidiaries
Namespace Prefix: | jec_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | instant

X
- Details
Name: | us-gaap_LossContingenciesLineItems
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Definition Number of pending claims pertaining to a loss contingency. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 450 -SubTopic 20 -Section 50 -Paragraph 4 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=25496072&loc=d3e14435-108349 + Details
Name: | us-gaap_LossContingencyPendingClaimsNumber
Namespace Prefix: | us-gaap_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | instant