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Reportable Segments - Narrative (Details) - USD ($) $ in Millions | Oct. 02, 2022 | May 31, 2022 | Oct. 03, 2021
--- | --- | --- | ---
Financial information concerning reportable segments |  |  |
Cash settlement for claim receivable | $ 0 |  | $ 11
RCM |  |  |
Financial information concerning reportable segments |  |  |
Cash settlement for claim receivable |  | $ 11 |

X
- Definition Represents the unbilled accounts receivable related to claims and requests for equitable adjustment on contracts. + References No definition available. + Details
Name: | ttek_GovernmentContractReceivableUnbilledAmountsRelatedToClaimsAndRequestsForEquitableAdjustmentOnContract
Namespace Prefix: | ttek_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

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

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