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Long-term Debt (Revolving Credit Facility) (Details) (USD $) | 6 Months Ended |  | 6 Months Ended |  |  |  |  |
--- | --- | --- | --- | --- | --- | --- | --- | ---
Mar. 28, 2014 tranche | Mar. 28, 2014 Letter of Credit [Member] | Mar. 28, 2014 Subfacility of Swingline Loans [Member] | Mar. 28, 2014 Minimum [Member] | Mar. 28, 2014 Minimum [Member] Eurocurrency Interest Rate [Member] | Mar. 28, 2014 Minimum [Member] Base Interest Rate [Member] | Mar. 28, 2014 Maximum [Member] | Mar. 28, 2014 Maximum [Member] Eurocurrency Interest Rate [Member] | Mar. 28, 2014 Maximum [Member] Base Interest Rate [Member] | Mar. 28, 2014 2014 Facility [Member] | Mar. 28, 2014 2014 Facility [Member] Revolving Credit Facility [Member] | Feb. 07, 2014 2014 Facility [Member] Revolving Credit Facility [Member] | Mar. 28, 2014 2014 Facility [Member] Letter of Credit [Member] | Feb. 07, 2014 2012 Facility [Member] Revolving Credit Facility [Member] | Mar. 28, 2014 Committed and Uncommitted Letter of Credit Facility [Member] Letter of Credit [Member]
Line of Credit Facility [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Credit facility, maximum borrowing capacity |  | $ 300,000,000 | $ 50,000,000 |  |  |  |  |  |  |  |  | $ 1,600,000,000 |  | $ 1,210,000,000 |
Credit facility potential borrowing capacity |  |  |  |  |  |  |  |  |  |  |  | 2,100,000,000 |  |  |
Direct borrowings on credit facility |  |  |  |  |  |  |  |  |  |  | 900,000,000 |  | 10,500,000 |  | 324,900,000
Available borrowing capacity |  |  |  |  |  |  |  |  |  | 700,000,000 |  |  |  |  |
Total issued letters of credit | $ 335,400,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of tranches in revolving credit facility (in tranches) | 2 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Margin added to variable rate interest rate |  |  |  |  | 1.00% | 0.00% |  | 1.50% | 0.50% |  |  |  |  |  |
Facility fee percentage |  |  |  | 0.10% |  |  | 0.25% |  |  |  |  |  |  |  |

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- Definition Line of Credit Facility, Accordion Feature, Potential Borrowing Capacity + References No definition available. + Details
Name: | jec_LineofCreditFacilityAccordionFeaturePotentialBorrowingCapacity
Namespace Prefix: | jec_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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- Definition Number of Tranches in Revolving Credit Facility + References No definition available. + Details
Name: | jec_NumberOfTranchesInRevolvingCreditFacility
Namespace Prefix: | jec_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | duration

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- Definition Percentage points added to the reference rate to compute the variable rate on the debt instrument. + References No definition available. + Details
Name: | us-gaap_DebtInstrumentBasisSpreadOnVariableRate1
Namespace Prefix: | us-gaap_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | duration

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- Definition The total amount of the contingent obligation under letters of credit outstanding as of the reporting date. + References No definition available. + Details
Name: | us-gaap_LettersOfCreditOutstandingAmount
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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- Definition Amount borrowed under the credit facility as of the balance sheet date. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 19, 22 -Article 5 + Details
Name: | us-gaap_LineOfCreditFacilityAmountOutstanding
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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- Definition The fee, expressed as a percentage of the line of credit facility, for the line of credit facility regardless of whether the facility has been used. + References No definition available. + Details
Name: | us-gaap_LineOfCreditFacilityCommitmentFeePercentage
Namespace Prefix: | us-gaap_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | duration

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- Definition Amount of current borrowing capacity under the credit facility considering any current restrictions on the amount that could be borrowed (for example, borrowings may be limited by the amount of current assets), but without considering any amounts currently outstanding under the facility. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.19(b),22(b)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 19, 22 -Article 5 + Details
Name: | us-gaap_LineOfCreditFacilityCurrentBorrowingCapacity
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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

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- Definition Maximum borrowing capacity under the credit facility without consideration of any current restrictions on the amount that could be borrowed or the amounts currently outstanding under the facility. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.19(b),22(b)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 19, 22 -Article 5 + Details
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Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant