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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%

X

- 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

X

- 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

X

- 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

X

- 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

X

- 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

X

- 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

X

- 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

X

- Details

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

X

- 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

Name:	us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant