XML 55 R43.htm IDEA: XBRL DOCUMENT
v3.8.0.1

Reportable Segments - Financial Information (Details) $ in Thousands | 3 Months Ended | 6 Months Ended |
--- | --- | --- | ---
Apr. 01, 2018 USD ($) | Apr. 02, 2017 USD ($) | Apr. 01, 2018 USD ($) segment | Apr. 02, 2017 USD ($) | Oct. 01, 2017 USD ($)
Financial information regarding reportable segments |  |  |  |  |
Number of renamed reportable segments | segment |  |  | 2 |  |
Revenue | $ 700,262 | $ 663,781 | $ 1,460,010 | $ 1,332,632 |
Income (loss) from operations | 42,716 | 42,956 | 91,305 | 82,811 |
Total Assets | 2,082,793 |  | 2,082,793 |  | $ 1,902,745
Operating segment | GSG |  |  |  |  |
Financial information regarding reportable segments |  |  |  |  |
Revenue | 406,027 | 357,113 | 848,799 | 719,973 |
Income (loss) from operations | 34,177 | 33,432 | 73,302 | 63,600 |
Total Assets | 488,073 |  | 488,073 |  | 378,839
Operating segment | CIG |  |  |  |  |
Financial information regarding reportable segments |  |  |  |  |
Revenue | 309,704 | 329,127 | 641,217 | 647,198 |
Income (loss) from operations | 18,400 | 18,459 | 39,693 | 40,003 |
Total Assets | 507,493 |  | 507,493 |  | 518,697
Operating segment | RCM |  |  |  |  |
Financial information regarding reportable segments |  |  |  |  |
Revenue | 1,480 | (23) | 8,286 | 8,209 |
Income (loss) from operations | (489) | (8,466) | (1,647) | (11,508) |
Total Assets | 31,092 |  | 31,092 |  | 33,620
Elimination of inter-segment revenue |  |  |  |  |
Financial information regarding reportable segments |  |  |  |  |
Revenue | (16,949) | (22,436) | (38,292) | (42,748) |
Corporate |  |  |  |  |
Financial information regarding reportable segments |  |  |  |  |
Income (loss) from operations | (9,372) | $ (469) | (20,043) | $ (9,284) |
Total Assets | $ 1,056,135 |  | $ 1,056,135 |  | $ 971,589

X
- Definition Number Of Renamed Reportable Segments + References No definition available. + Details
Name: | ttek_NumberOfRenamedReportableSegments
Namespace Prefix: | ttek_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | duration

X
- Definition Sum of the carrying amounts as of the balance sheet date of all assets that are recognized. Assets are probable future economic benefits obtained or controlled by an entity as a result of past transactions or events. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-03(a)(12)) -URI http://asc.fasb.org/extlink&oid=6879938&loc=d3e572229-122910 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03(11)) -URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878 + Details
Name: | us-gaap_Assets
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition The net result for the period of deducting operating expenses from operating revenues. + References No definition available. + Details
Name: | us-gaap_OperatingIncomeLoss
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition Aggregate revenue during the period from services rendered in the normal course of business, after deducting allowances and discounts. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 225 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SX 210.5-03.1(d)) -URI http://asc.fasb.org/extlink&oid=63488584&loc=d3e20235-122688 + Details
Name: | us-gaap_SalesRevenueServicesNet
Namespace Prefix: | us-gaap_
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_SegmentReportingInformationLineItems
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Details
Name: | us-gaap_ConsolidationItemsAxis=us-gaap_OperatingSegmentsMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_StatementBusinessSegmentsAxis=ttek_GovernmentServicesGroupMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_StatementBusinessSegmentsAxis=ttek_CommercialInternationalServicesGroupMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_StatementBusinessSegmentsAxis=ttek_RemediationAndConstructionManagementMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_ConsolidationItemsAxis=us-gaap_IntersegmentEliminationMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_ConsolidationItemsAxis=us-gaap_CorporateNonSegmentMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |