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v3.22.2.2

Basis of Presentation and Preparation - Narrative (Details) $ in Millions | Oct. 02, 2022 USD ($)
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Organization, Consolidation and Presentation of Financial Statements [Abstract] |
Government assistance, amount, cumulative, current | $ 26.0
Government assistance, amount expected to be recognized in next twelve months | 9.0
Government assistance, amount, cumulative, noncurrent | $ 17.0

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- Definition Government Assistance, Amount, Cumulative, Current + References No definition available. + Details
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Namespace Prefix: | ttek_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition Government Assistance, Amount, Cumulative, Noncurrent + References No definition available. + Details
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Namespace Prefix: | ttek_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition Government Assistance, Amount Expected To Be Recognized In Next Twelve Months + References No definition available. + Details
Name: | ttek_GovernmentAssistanceAmountExpectedToBeRecognizedInNextTwelveMonths
Namespace Prefix: | ttek_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- References No definition available. + Details
Name: | us-gaap_OrganizationConsolidationAndPresentationOfFinancialStatementsAbstract
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
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