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COMMITMENTS AND CONTINGENCIES (Details) | Sep. 29, 2020 retirementPlan
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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 + References No definition available. + Details
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Namespace Prefix: | tnet_
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Balance Type: | na
Period Type: | instant

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- References No definition available. + Details
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Namespace Prefix: | us-gaap_
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Balance Type: | na
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