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Cover Cover
 6 Months Ended
Jul. 25, 2019
Jun. 30, 2019
Cover page.    
Entity File Number   001-36373
Entity Tax Identification Number   95-3359658
Entity Address, Postal Zip Code   94568
City Area Code   510
Local Phone Number   352-5000
Document Type   8-K
Document Period End Date Jul. 25, 2019  
Entity Registrant Name   TRINET GROUP INC
Entity Emerging Growth Company   false
Title of 12(b) Security   Common stock par value $0.000025 per share
Pre-commencement Issuer Tender Offer   false
Pre-commencement Tender Offer   false
Written Communications   false
Soliciting Material   false
Entity Incorporation, State or Country Code   DE
Trading Symbol   TNET
Security Exchange Name   NYSE
Entity Address, Address Line One   One Park Place, Suite 600
Entity Address, City or Town   Dublin,
Entity Address, State or Province   CA