XML 120 R95.htm IDEA: XBRL DOCUMENT
v3.19.3

Reportable Segments - Financial Information (Details) |  | 3 Months Ended | 12 Months Ended
--- | --- | --- | ---
Jul. 01, 2019 USD ($) | Sep. 29, 2019 USD ($) | Jun. 30, 2019 USD ($) | Mar. 31, 2019 USD ($) | Dec. 30, 2018 USD ($) | Sep. 30, 2018 USD ($) | Jul. 01, 2018 USD ($) | Apr. 01, 2018 USD ($) | Dec. 31, 2017 USD ($) | Sep. 29, 2019 USD ($) segment | Sep. 30, 2018 USD ($) segment | Oct. 01, 2017 USD ($)
Financial information concerning reportable segments |  |  |  |  |  |  |  |  |  |  |  |
Number of renamed reportable segments | segment |  |  |  |  |  |  |  |  |  | 2 | 2 |
Revenue |  |  |  |  |  |  |  |  |  | $ 3,107,348,000 | $ 2,964,148,000 | $ 2,753,360,000
Income from operations |  | $ 20,665,000 | $ 64,841,000 | $ 47,545,000 | $ 55,711,000 | $ 43,285,000 | $ 55,496,000 | $ 42,716,000 | $ 48,589,000 | 188,762,000 | 190,086,000 | 183,342,000
Amortization expense for intangible assets |  |  |  |  |  |  |  |  |  | 11,600,000 | 18,200,000 | 22,800,000
Fair value adjustments to contingent consideration liabilities |  |  |  |  |  |  |  |  |  | (1,085,000) | (4,252,000) | 6,923,000
Total Assets |  | 2,147,408,000 |  |  |  | 1,959,421,000 |  |  |  | 2,147,408,000 | 1,959,421,000 |
Impairment of goodwill | $ 0 | 7,800,000 |  |  |  |  |  |  |  | 7,755,000 | 0 | 0
GSG |  |  |  |  |  |  |  |  |  |  |  |
Financial information concerning reportable segments |  |  |  |  |  |  |  |  |  |  |  |
Impairment of goodwill |  |  |  |  |  |  |  |  |  | 0 |  |
CIG |  |  |  |  |  |  |  |  |  |  |  |
Financial information concerning reportable segments |  |  |  |  |  |  |  |  |  |  |  |
Impairment of goodwill |  |  |  |  |  |  |  |  |  | 7,755,000 |  |
Operating segments | GSG |  |  |  |  |  |  |  |  |  |  |  |
Financial information concerning reportable segments |  |  |  |  |  |  |  |  |  |  |  |
Revenue |  |  |  |  |  |  |  |  |  | 1,820,671,000 | 1,694,871,000 | 1,487,611,000
Income from operations |  |  |  |  |  |  |  |  |  | 185,263,000 | 168,211,000 | 138,199,000
Total Assets |  | 587,040,000 |  |  |  | 468,010,000 |  |  |  | 587,040,000 | 468,010,000 |
Operating segments | CIG |  |  |  |  |  |  |  |  |  |  |  |
Financial information concerning reportable segments |  |  |  |  |  |  |  |  |  |  |  |
Revenue |  |  |  |  |  |  |  |  |  | 1,342,509,000 | 1,323,142,000 | 1,326,020,000
Income from operations |  |  |  |  |  |  |  |  |  | 79,633,000 | 74,451,000 | 90,817,000
Total Assets |  | 450,276,000 |  |  |  | 478,197,000 |  |  |  | 450,276,000 | 478,197,000 |
Operating segments | RCM |  |  |  |  |  |  |  |  |  |  |  |
Financial information concerning reportable segments |  |  |  |  |  |  |  |  |  |  |  |
Revenue |  |  |  |  |  |  |  |  |  | (1,542,000) | 14,199,000 | 18,207,000
Income from operations |  |  |  |  |  |  |  |  |  | (5,933,000) | (4,573,000) | (14,712,000)
Total Assets |  | 15,608,000 |  |  |  | 25,683,000 |  |  |  | 15,608,000 | 25,683,000 |
Elimination of inter-segment revenue |  |  |  |  |  |  |  |  |  |  |  |
Financial information concerning reportable segments |  |  |  |  |  |  |  |  |  |  |  |
Revenue |  |  |  |  |  |  |  |  |  | (54,290,000) | (68,064,000) | (78,478,000)
Corporate |  |  |  |  |  |  |  |  |  |  |  |
Financial information concerning reportable segments |  |  |  |  |  |  |  |  |  |  |  |
Income from operations |  |  |  |  |  |  |  |  |  | (70,201,000) | (48,003,000) | $ (30,962,000)
Total Assets |  | $ 1,094,484,000 |  |  |  | $ 987,531,000 |  |  |  | $ 1,094,484,000 | $ 987,531,000 |

X
- Definition The amount of fair value adjustments to contingent consideration during the reporting period. + References No definition available. + Details
Name: | ttek_FairValueAdjustmentsToContingentConsideration
Namespace Prefix: | ttek_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

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 The aggregate expense charged against earnings to allocate the cost of intangible assets (nonphysical assets not used in production) in a systematic and rational manner to the periods expected to benefit from such assets. As a noncash expense, this element is added back to net income when calculating cash provided by or used in operations using the indirect method. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=118932676&loc=d3e3602-108585 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 30 -Section 50 -Paragraph 2 -Subparagraph (a)(2) -URI http://asc.fasb.org/extlink&oid=66006027&loc=d3e16323-109275 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 30 -Section 45 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6388964&loc=d3e16225-109274 + Details
Name: | us-gaap_AmortizationOfIntangibleAssets
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
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://fasb.org/us-gaap/role/ref/legacyRef -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 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 280 -SubTopic 10 -Section 50 -Paragraph 22 -URI http://asc.fasb.org/extlink&oid=115929826&loc=d3e8736-108599 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -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=119400593&loc=d3e572229-122910 + Details
Name: | us-gaap_Assets
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition Amount of loss from the write-down of an asset representing the future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 20 -Section 50 -Paragraph 2 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=108376223&loc=d3e13854-109267 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=118932676&loc=d3e3602-108585 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (e) -URI http://asc.fasb.org/extlink&oid=108376223&loc=d3e13816-109267 Reference 4: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 20 -Section 45 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=99380562&loc=d3e13777-109266 + Details
Name: | us-gaap_GoodwillImpairmentLoss
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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 Amount, excluding tax collected from customer, of revenue from satisfaction of performance obligation by transferring promised good or service to customer. Tax collected from customer is tax assessed by governmental authority that is both imposed on and concurrent with specific revenue-producing transaction, including, but not limited to, sales, use, value added and excise. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 606 -SubTopic 10 -Section 50 -Paragraph 4 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=118956577&loc=SL49130543-203045 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 606 -SubTopic 10 -Section 50 -Paragraph 5 -URI http://asc.fasb.org/extlink&oid=118956577&loc=SL49130545-203045 + Details
Name: | us-gaap_RevenueFromContractWithCustomerExcludingAssessedTax
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_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: | srt_ConsolidationItemsAxis=us-gaap_OperatingSegmentsMember
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: | srt_ConsolidationItemsAxis=us-gaap_IntersegmentEliminationMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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