XML 73 R61.htm IDEA: XBRL DOCUMENT v3.21.2

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

X

- 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

X

- References

No definition available.

+ Details

Name:	us-gaap_CommitmentsAndContingenciesDisclosureAbstract
Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration