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Commitments And Contingencies, And Derivative Financial Instruments (Rent Expense And Sublease Income) (Details) (USD $) In Thousands | 12 Months Ended
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Sep. 30, 2011 | Oct. 01, 2010 | Oct. 02, 2009
Commitments And Contingencies, And Derivative Financial Instruments |  |  |
Rent expense | $ 157,955 | $ 155,517 | $ 159,682
Sublease income | (8,315) | (11,160) | (10,012)
Net rent | $ 149,640 | $ 144,357 | $ 149,670

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- Definition Commitments And Contingencies And Derivative Financial Instruments [Abstract] + Details
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Namespace Prefix: | jec
Data Type: | xbrli:stringItemType
Balance Type: | na
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- Definition Net Rent + Details
Name: | jec_NetRent
Namespace Prefix: | jec
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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- Definition Rental expense incurred for leased assets including furniture and equipment which has not been recognized in costs and expenses applicable to sales and revenues; for example, cost of goods sold or other operating costs and expenses. + Details
Name: | us-gaap_LeaseAndRentalExpense
Namespace Prefix: | us-gaap
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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- Definition The amount of revenue recognized for the period under subleasing arrangements. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 840 -SubTopic 20 -Section 55 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=6584307&loc=d3e41620-112719 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name FASB Technical Bulletin (FTB) -Number 88-1 -Paragraph 9 -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. + Details
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