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v3.23.1

INCOME TAXES (Details) | 3 Months Ended
--- | ---
Mar. 31, 2023 | Mar. 31, 2022
Income Tax Disclosure [Abstract] |  |
Effective income tax rate | 27.00% | 27.00%

X
- Definition Increase Decrease In Effective Income Tax Rate Percent + References No definition available. + Details
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Namespace Prefix: | tnet_
Data Type: | dtr-types:percentItemType
Balance Type: | na
Period Type: | duration

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