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Commitments and Contingencies (Details) | Jul. 15, 2019 action
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Commitments and Contingencies Disclosure [Abstract] |
Number of qui tam actions | 3

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- Definition Loss Contingency, Number Of Actions + References No definition available. + Details
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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_
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Balance Type: | na
Period Type: | duration