v3.22.2.2
Cover Page
 9 Months Ended
Sep. 30, 2022
shares
Cover [Abstract]  
Document Type 10-Q
Document Quarterly Report true
Document Period End Date Sep. 30, 2022
Document Transition Report false
Entity File Number 1-10427
Entity Registrant Name ROBERT HALF INTERNATIONAL INC.
Entity Incorporation, State or Country Code DE
Entity Tax Identification Number 94-1648752
Entity Address, Address Line One 2884 Sand Hill Road
Entity Address, Address Line Two Suite 200
Entity Address, City or Town Menlo Park,
Entity Address, State or Province CA
Entity Address, Postal Zip Code 94025
City Area Code 650
Local Phone Number 234-6000
Title of 12(b) Security Common Stock, par value $0.001 per share
Trading Symbol RHI
Security Exchange Name NYSE
Entity Current Reporting Status Yes
Entity Interactive Data Current Yes
Entity Filer Category Large Accelerated Filer
Entity Small Business false
Entity Emerging Growth Company false
Entity Shell Company false
Entity Common Stock, Shares Outstanding 108,498,536
Amendment Flag false
Document Fiscal Year Focus 2022
Document Fiscal Period Focus Q3
Entity Central Index Key 0000315213
Current Fiscal Year End Date --12-31