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Commitments and Contingencies (Details) | Jan. 14, 2019 action
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Commitments and Contingencies Disclosure [Abstract] |
Loss contingency, actions taken by plaintiff | 3

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- Definition Loss Contingency, Number Of Actions + References No definition available. + Details
Name: | ttek_LossContingencyNumberOfActions
Namespace Prefix: | ttek_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | instant

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