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COMMITMENTS AND CONTINGENCIES (Details)	Sep. 29, 2020 retirement_plan
Commitments and Contingencies Disclosure [Abstract]
Number of retirement plans subject to class action	2

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- Definition

Number Of Retirement Plans Subject To Class Action

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No definition available.

+ Details

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Namespace Prefix:	tnet_
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