XML 109 R52.htm IDEA: XBRL DOCUMENT
v3.19.3

Employee Stock Purchase and Stock Option Plans (Stock Purchase and Stock Option Plans Information on the 1999 Plans) (Details) - shares | 12 Months Ended |
--- | --- | ---
Sep. 27, 2019 | Sep. 28, 2018
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |
Number of shares authorized (in shares) | 30,950,000 |
Number of remaining shares reserved for issuance at September 27, 2019 (in shares) | 6,146,619 |
Number of shares relating to outstanding stock options at September 27, 2019 (in shares) | 926,606 |
Number of shares available for future awards (in shares) | 5,220,013 | 5,631,371
1999 SIP |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |
Number of shares authorized (in shares) | 29,850,000 |
Number of remaining shares reserved for issuance at September 27, 2019 (in shares) | 5,719,617 |
Number of shares relating to outstanding stock options at September 27, 2019 (in shares) | 755,856 |
Number of shares available for future awards (in shares) | 4,963,761 | 5,335,741
1999 SIP | Other Than Option Stock Appreciation Rights SARS |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |
Award number of shares, fungible share basis (in shares) | 1.92 |
Award number of shares, non-fungible share basis (in shares) | 1 |
1999 ODSP |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |
Number of shares authorized (in shares) | 1,100,000 |
Number of remaining shares reserved for issuance at September 27, 2019 (in shares) | 427,002 |
Number of shares relating to outstanding stock options at September 27, 2019 (in shares) | 170,750 |
Number of shares available for future awards (in shares) | 256,252 | 295,630
Award number of shares, non-fungible share basis (in shares) | 1.92 |

X
- Definition Share-based compensation arrangement by share-based payment award, award number of shares, fungible share basis. + References No definition available. + Details
Name: | jec_ShareBasedCompensationArrangementByShareBasedPaymentAwardAwardNumberOfSharesFungibleShareBasis
Namespace Prefix: | jec_
Data Type: | xbrli:sharesItemType
Balance Type: | na
Period Type: | duration

X
- Definition Share-based compensation arrangement by share-based payment award, award number of shares, non-fungible share basis. + References No definition available. + Details
Name: | jec_ShareBasedCompensationArrangementByShareBasedPaymentAwardAwardNumberOfSharesNonFungibleShareBasis
Namespace Prefix: | jec_
Data Type: | xbrli:sharesItemType
Balance Type: | na
Period Type: | duration

X
- Definition Aggregate number of common shares reserved for future issuance. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.29) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
Name: | us-gaap_CommonStockCapitalSharesReservedForFutureIssuance
Namespace Prefix: | us-gaap_
Data Type: | xbrli:sharesItemType
Balance Type: | na
Period Type: | instant

X
- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References No definition available. + Details
Name: | us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Definition Number of shares authorized for issuance under share-based payment arrangement. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (a)(3) -URI http://asc.fasb.org/extlink&oid=116856206&loc=d3e5070-113901 + Details
Name: | us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesAuthorized
Namespace Prefix: | us-gaap_
Data Type: | xbrli:sharesItemType
Balance Type: | na
Period Type: | instant

X
- Definition The difference between the maximum number of shares (or other type of equity) authorized for issuance under the plan (including the effects of amendments and adjustments), and the sum of: 1) the number of shares (or other type of equity) already issued upon exercise of options or other equity-based awards under the plan; and 2) shares (or other type of equity) reserved for issuance on granting of outstanding awards, net of cancellations and forfeitures, if applicable. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=116856206&loc=d3e5070-113901 + Details
Name: | us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesAvailableForGrant
Namespace Prefix: | us-gaap_
Data Type: | xbrli:sharesItemType
Balance Type: | na
Period Type: | instant

X
- Definition The number of shares reserved for issuance pertaining to the outstanding stock options as of the balance sheet date for all option plans in the customized range of exercise prices. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(1)(i)-(ii) -URI http://asc.fasb.org/extlink&oid=116856206&loc=d3e5070-113901 + Details
Name: | us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansExercisePriceRangeNumberOfOutstandingOptions
Namespace Prefix: | us-gaap_
Data Type: | xbrli:sharesItemType
Balance Type: | na
Period Type: | instant

X
- Details
Name: | us-gaap_PlanNameAxis=jec_NineteenNinetyNineStockIncentivePlanMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_AwardTypeAxis=jec_OtherThanOptionStockAppreciationRightsSARSMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_PlanNameAxis=jec_NineteenNinetyNineOutsideDirectorStockPlanMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |