XML 90 R74.htm IDEA: XBRL DOCUMENT
v3.10.0.1

Restructuring and Other Charges - Summary of Restructuring and Other Activities by Major Type of Costs (Details) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Sep. 28, 2018 | Sep. 29, 2017 | Sep. 30, 2016
Restructuring Cost and Reserve [Line Items] |  |  |
Gain (Loss) on disposal of business and investments | $ (20,967) | $ 10,058 | $ (41,410)
CH2M HILL Companies, Ltd. |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |
Restructuring costs | 190,806 | 135,438 | 187,907
CH2M HILL Companies, Ltd. | Lease Abandonments |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |
Restructuring costs | 53,914 | 55,647 | 92,643
CH2M HILL Companies, Ltd. | Involuntary Terminations |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |
Restructuring costs | 37,063 | 43,667 | 85,599
CH2M HILL Companies, Ltd. | Outside Services |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |
Restructuring costs | 36,308 | 4,236 | 7,398
CH2M HILL Companies, Ltd. | Other |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |
Restructuring costs | 63,521 | $ 31,888 | $ 2,267
Gain (Loss) on disposal of business and investments | $ (21,000) |  |

X
- Definition Gain (Loss) on Sale of Business and Investments + References No definition available. + Details
Name: | jec_GainLossonSaleofBusinessandInvestments
Namespace Prefix: | jec_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

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_RestructuringCostAndReserveLineItems
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Definition Amount, after cash payment, of expenses associated with exit or disposal activities pursuant to an authorized plan. Excludes expenses related to a discontinued operation or an asset retirement obligation. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=98514028&loc=d3e3602-108585 + Details
Name: | us-gaap_RestructuringCosts
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Details
Name: | us-gaap_BusinessAcquisitionAxis=jec_CH2MHILLCompaniesLimitedMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_RestructuringCostAndReserveAxis=jec_LeaseAbandonmentMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_RestructuringCostAndReserveAxis=jec_InvoluntaryTerminationsMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_RestructuringCostAndReserveAxis=jec_OutsideServicesMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_RestructuringCostAndReserveAxis=us-gaap_OtherRestructuringMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |