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Commitments and Contingencies (Details)	Jan. 14, 2019 action
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

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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_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration