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Commitments and Contingencies (Details) (BPR Triax) | Apr. 17, 2012 item
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BPR Triax |
Loss contingencies |
Number of former employees of BPR Triax charged with allegations of corruption | 2 ttek_NumberOfEmployeesChargedWithAllegationsOfCorruption / us-gaap_RelatedPartyTransactionsByRelatedPartyAxis = us-gaap_SubsidiaryOfCommonParentMember

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- Definition Represents the number of former employees charged with allegations of corruption under the Canadian Criminal Code. + References No definition available. + Details
Name: | ttek_NumberOfEmployeesChargedWithAllegationsOfCorruption
Namespace Prefix: | ttek_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | instant

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- Details
Name: | us-gaap_LossContingenciesLineItems
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration