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v3.23.2

INCOME TAXES (Details) | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2023 | Jun. 30, 2022 | Jun. 30, 2023 | Jun. 30, 2022
Income Tax Disclosure [Abstract] |  |  |  |
Effective income tax rate | 25.00% | 27.00% | 27.00% | 27.00%

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

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