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Financial Instruments and Fair Value Measurements - Narrative (Details) $ in Millions | Mar. 31, 2020 USD ($)
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Fair Value Disclosures [Abstract] |
Total debt | $ 620
Fair value of total debt | $ 607

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- Definition Debt, Long-term And Short-Term, Combined Amount, Fair Value + References No definition available. + Details
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Namespace Prefix: | tnet_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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- Definition Represents the aggregate of total long-term debt, including current maturities and short-term debt. + References No definition available. + Details
Name: | us-gaap_DebtLongtermAndShorttermCombinedAmount
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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