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ACCRUED WORKERS' COMPENSATION COSTS - Additional Information (Details) - USD ($) $ in Millions	Mar. 31, 2024	Dec. 31, 2023
Insurance [Abstract]
Collateral held by insurance carriers	$ 31	$ 32
Collateral paid to carriers and offset against loss reserves	$ 4	$ 5

X

- Definition

Collateral Held by Insurance Carriers

+ References

No definition available.

+ Details

Name:	tnet_CollateralHeldByInsuranceCarriers
Namespace Prefix:	tnet_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

X

- Definition

Liability for Unpaid Claims and Claims Adjustment Expense, Collateral

+ References

No definition available.

+ Details

Name:	tnet_LiabilityForUnpaidClaimsAndClaimsAdjustmentExpenseCollateral
Namespace Prefix:	tnet_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

X

- References

No definition available.

+ Details

Name:	us-gaap_InsuranceAbstract
Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration