XML 75 R59.htm IDEA: XBRL DOCUMENT
v3.8.0.1

Mergers and Acquisitions - Contingent Consideration Narrative (Details) CAD in Millions |  | 3 Months Ended | 12 Months Ended
--- | --- | --- | ---
Jul. 03, 2017 USD ($) | Oct. 01, 2017 USD ($) | Apr. 02, 2017 USD ($) | Oct. 02, 2016 USD ($) | Mar. 27, 2016 USD ($) | Dec. 27, 2015 USD ($) | Sep. 27, 2015 USD ($) | Jun. 28, 2015 USD ($) | Mar. 29, 2015 CAD | Mar. 29, 2015 USD ($) | Sep. 28, 2014 USD ($) | Dec. 29, 2013 CAD | Oct. 01, 2017 USD ($) | Oct. 02, 2016 USD ($) | Sep. 27, 2015 USD ($)
Business acquisition |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Increase (decrease) in contingent consideration |  |  |  |  |  |  |  |  |  |  |  |  | $ (6,900,000) | $ 2,800,000 |
Contingent earn-out liability |  | $ 2,400,000 |  |  |  |  | $ 0 |  |  |  |  |  | 2,400,000 |  | $ 0
Aggregate maximum of contingent consideration |  | 8,900,000 |  |  |  |  |  |  |  |  |  |  | 8,900,000 |  |
Gain (loss) on change in contingent consideration |  |  |  |  |  |  |  |  |  |  |  |  | $ 6,900,000 | (2,800,000) |
Impairment of goodwill | $ 0 |  |  |  |  |  | 58,100,000 |  |  |  |  |  |  |  |
CEG |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Business acquisition |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Earn-out period |  |  |  |  |  |  |  | 3 years |  |  |  |  |  |  |
Increase (decrease) in contingent consideration |  |  |  |  | $ 1,800,000 |  |  |  |  |  |  |  |  | 1,800,000 |
Earn-out paid to former owners |  | $ 1,300,000 |  | $ 2,300,000 |  |  |  |  |  |  |  |  |  |  |
Contingent earn-out liability |  |  | $ 1,800,000 | 3,900,000 |  |  | 4,100,000 | $ 4,100,000 |  |  |  |  |  | 3,900,000 | 4,100,000
Aggregate maximum of contingent consideration |  |  |  |  |  |  | 9,800,000 | 9,800,000 |  |  |  |  |  |  | 9,800,000
Potential earn-out to be paid each year |  |  |  |  |  |  |  | $ 3,250,000 |  |  |  |  |  |  |
Estimated potential earn-out (as a percent) |  |  |  |  |  |  |  | 42.00% |  |  |  |  |  |  |
Minimum operating income threshold to earn contingent consideration during year one |  |  |  |  |  |  |  | $ 2,000,000 |  |  |  |  |  |  |
Minimum operating income threshold to earn contingent consideration during year two |  |  |  |  |  |  |  | 2,300,000 |  |  |  |  |  |  |
Minimum operating income threshold to earn contingent consideration during year three |  |  |  |  |  |  |  | 2,600,000 |  |  |  |  |  |  |
Gain (loss) on change in contingent consideration |  |  | 2,100,000 |  | $ (1,800,000) |  |  |  |  |  |  |  |  |  |
Potential maximum earn-out to be paid |  |  |  |  |  |  |  | 9,800,000 |  |  |  |  |  |  |
Operating income to earn maximum consideration during the first year |  |  |  |  |  |  |  | 4,500,000 |  |  |  |  |  |  |
Operating income to earn maximum consideration during the second year |  |  |  |  |  |  |  | 4,800,000 |  |  |  |  |  |  |
Operating income to earn maximum consideration during the third year |  |  |  |  |  |  |  | $ 5,100,000 |  |  |  |  |  |  |
Impairment of goodwill |  |  | 0 |  |  |  |  |  |  |  |  |  |  |  |
Other Acquisitions |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Business acquisition |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Earn-out paid to former owners |  |  |  |  |  |  |  |  |  |  |  |  |  | 1,000,000 |
Contingent earn-out liability |  |  |  |  |  |  | $ 0 |  |  |  |  |  |  |  | 0
Gain (loss) on change in contingent consideration |  |  |  |  |  |  |  |  |  |  |  |  |  | (1,000,000) |
INDUS |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Business acquisition |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Earn-out period |  |  |  |  | 2 years |  |  |  |  |  |  |  |  |  |
Contingent earn-out liability |  |  | 0 | $ 4,900,000 | $ 4,700,000 |  |  |  |  |  |  |  |  | $ 4,900,000 |
Aggregate maximum of contingent consideration |  |  |  |  | 8,000,000 |  |  |  |  |  |  |  |  |  |
Potential earn-out to be paid each year |  |  |  |  | $ 4,000,000 |  |  |  |  |  |  |  |  |  |
Estimated potential earn-out (as a percent) |  |  |  |  | 50.00% |  |  |  |  |  |  |  |  | 59.00% |
Minimum operating income threshold to earn contingent consideration during year one |  |  | 3,200,000 |  | $ 3,200,000 |  |  |  |  |  |  |  |  |  |
Minimum operating income threshold to earn contingent consideration during year two |  |  | 3,600,000 |  | 3,600,000 |  |  |  |  |  |  |  |  |  |
Gain (loss) on change in contingent consideration |  |  | 5,000,000 |  |  |  |  |  |  |  |  |  |  |  |
Operating income to earn maximum consideration during the first year |  |  |  |  | 3,600,000 |  |  |  |  |  |  |  |  |  |
Operating income to earn maximum consideration during the second year |  |  |  |  | $ 4,000,000 |  |  |  |  |  |  |  |  |  |
Impairment of goodwill |  |  | $ 0 |  |  |  |  |  |  |  |  |  |  |  |
Caber |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Business acquisition |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Earn-out period |  |  |  |  |  |  |  |  |  |  |  | 2 years |  |  |
Increase (decrease) in contingent consideration |  |  |  |  |  |  |  |  |  |  | $ 1,000,000 |  |  |  | (3,100,000)
Earn-out paid to former owners |  |  |  |  |  |  |  |  | CAD 4.0 | $ 3,200,000 |  |  |  |  |
Contingent earn-out liability |  |  |  |  |  |  |  |  |  | 0 |  | CAD 6.5 |  |  |
Aggregate maximum of contingent consideration | CAD |  |  |  |  |  |  |  |  |  |  |  | 8.0 |  |  |
Potential earn-out to be paid each year | CAD |  |  |  |  |  |  |  |  |  |  |  | CAD 4.0 |  |  |
Estimated potential earn-out (as a percent) |  |  |  |  |  |  |  |  |  |  |  | 81.00% |  |  |
Minimum operating income threshold to earn contingent consideration during year one | CAD |  |  |  |  |  |  |  |  |  |  |  | CAD 4.0 |  |  |
Minimum operating income threshold to earn contingent consideration during year two | CAD |  |  |  |  |  |  |  |  | CAD 4.6 |  |  | 4.6 |  |  |
Gain (loss) on change in contingent consideration |  |  |  |  |  | $ 0 |  |  |  | $ 3,100,000 | (1,000,000) |  |  |  | $ 3,100,000
Potential maximum earn-out to be paid |  |  |  |  |  |  |  |  |  |  | $ 4,000,000 |  |  |  |
Operating income to earn maximum consideration during the first year | CAD |  |  |  |  |  |  |  |  |  |  |  | 4.4 |  |  |
Operating income to earn maximum consideration during the second year | CAD |  |  |  |  |  |  |  |  |  |  |  | CAD 5.1 |  |  |
Minimum |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Business acquisition |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Earn-out period |  |  |  |  |  |  |  |  |  |  |  |  | 2 years |  |
Maximum |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Business acquisition |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Earn-out period |  |  |  |  |  |  |  |  |  |  |  |  | 3 years |  |

X
- Definition Represents the information pertaining to the earn out payment made to the acquired entity each year under agreement. + References No definition available. + Details
Name: | ttek_BusinessAcquisitionContingentConsiderationActualCashPaymentPerYear
Namespace Prefix: | ttek_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition Amount of actual cash payments resulting from the contingent consideration arrangement. + References No definition available. + Details
Name: | ttek_BusinessAcquisitionContingentConsiderationActualCashPaymentReported
Namespace Prefix: | ttek_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition Represents the information pertaining to the estimated percentage of the potential earn out as determined by the acquiring entity. + References No definition available. + Details
Name: | ttek_BusinessAcquisitionContingentConsiderationEstimatedPotentialEarnOut
Namespace Prefix: | ttek_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | duration

X
- Definition Represents the information pertaining to the gain (loss) on change in the value of contingent consideration for the period. + References No definition available. + Details
Name: | ttek_BusinessAcquisitionContingentConsiderationGainLossOnChangeInValueOfConsideration
Namespace Prefix: | ttek_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition Represents the information pertaining to the minimum operating income threshold to be earned during the first year. + References No definition available. + Details
Name: | ttek_BusinessAcquisitionContingentConsiderationMinimumOperatingIncomeThresholdYearOne
Namespace Prefix: | ttek_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition Represents the information pertaining to the minimum operating income threshold to be earned during the third year. + References No definition available. + Details
Name: | ttek_BusinessAcquisitionContingentConsiderationMinimumOperatingIncomeThresholdYearThree
Namespace Prefix: | ttek_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition Represents the information pertaining to the minimum operating income threshold to be earned during the second year. + References No definition available. + Details
Name: | ttek_BusinessAcquisitionContingentConsiderationMinimumOperatingIncomeThresholdYearTwo
Namespace Prefix: | ttek_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition Represents the information pertaining to the operating income to be earned to receive maximum consideration during the first year. + References No definition available. + Details
Name: | ttek_BusinessAcquisitionContingentConsiderationOperatingIncomeToEarnMaximumConsiderationYearOne
Namespace Prefix: | ttek_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition Represents the information pertaining to the operating income to be earned to receive maximum consideration during the third year. + References No definition available. + Details
Name: | ttek_BusinessAcquisitionContingentConsiderationOperatingIncomeToEarnMaximumConsiderationYearThree
Namespace Prefix: | ttek_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition Represents the information pertaining to the operating income to be earned to receive maximum consideration during the second year. + References No definition available. + Details
Name: | ttek_BusinessAcquisitionContingentConsiderationOperatingIncomeToEarnMaximumConsiderationYearTwo
Namespace Prefix: | ttek_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition Represents the earn out period for operating income projection used for fair value measurement. + References No definition available. + Details
Name: | ttek_BusinessAcquisitionEarnOutPeriodForOperatingIncomeProjectionsUsedInFairValueMeasurement
Namespace Prefix: | ttek_
Data Type: | xbrli:durationItemType
Balance Type: | na
Period Type: | duration

X
- Definition Represents the maximum amount of contingent consideration to be paid under purchase agreement. + References No definition available. + Details
Name: | ttek_BusinessAcquisitionMaximumContingentConsiderationPayments
Namespace Prefix: | ttek_
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_BusinessAcquisitionLineItems
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Definition Amount of increase (decrease) in the value of a contingent consideration liability, including, but not limited to, differences arising upon settlement. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 30 -Section 50 -Paragraph 4 -Subparagraph (a)(1) -URI http://asc.fasb.org/extlink&oid=35744584&loc=d3e7008-128479 + Details
Name: | us-gaap_BusinessCombinationContingentConsiderationArrangementsChangeInAmountOfContingentConsiderationLiability1
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition For contingent consideration arrangements recognized in connection with a business combination, this element represents an estimate of the high-end of the potential range (undiscounted) of the consideration which may be paid. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 30 -Section 50 -Paragraph 1 -Subparagraph (c)(3) -URI http://asc.fasb.org/extlink&oid=35744584&loc=d3e6927-128479 + Details
Name: | us-gaap_BusinessCombinationContingentConsiderationArrangementsRangeOfOutcomesValueHigh
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition Amount of liability recognized arising from contingent consideration in a business combination. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 30 -Section 50 -Paragraph 1 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=35744584&loc=d3e6927-128479 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 30 -Section 35 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=6911338&loc=d3e6819-128478 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 30 -Section 25 -Paragraph 6 -URI http://asc.fasb.org/extlink&oid=6911189&loc=d3e6408-128476 + Details
Name: | us-gaap_BusinessCombinationContingentConsiderationLiability
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
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://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 20 -Section 50 -Paragraph 2 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=35741047&loc=d3e13854-109267 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 20 -Section 45 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6388280&loc=d3e13777-109266 Reference 3: 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 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (e) -URI http://asc.fasb.org/extlink&oid=35741047&loc=d3e13816-109267 + Details
Name: | us-gaap_GoodwillImpairmentLoss
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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

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

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

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

X
- Details
Name: | us-gaap_RangeAxis=us-gaap_MinimumMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_RangeAxis=us-gaap_MaximumMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |