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Recent Accounting Pronouncements (Details) - USD ($) $ in Millions | 3 Months Ended |
--- | --- | ---
Dec. 31, 2023 | Oct. 01, 2023
Accounting Changes and Error Corrections [Abstract] |  |
Government assistance noncurrent liability |  | $ 21.0
Government assistance current liability | $ 11.0 |
Government assistance decrease in liability | $ 10.0 |

X
- Definition Government Assistance, Liability, Current + References No definition available. + Details
Name: | ttek_GovernmentAssistanceLiabilityCurrent
Namespace Prefix: | ttek_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition Government Assistance, Liability, Decrease + References No definition available. + Details
Name: | ttek_GovernmentAssistanceLiabilityDecrease
Namespace Prefix: | ttek_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition Government Assistance, Liability, Noncurrent + References No definition available. + Details
Name: | ttek_GovernmentAssistanceLiabilityNoncurrent
Namespace Prefix: | ttek_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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