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Cover Page - USD ($)
12 Months Ended
Dec. 31, 2022
Jan. 31, 2023
Jun. 30, 2022
Cover [Abstract]      
Document Type 10-K    
Document Annual Report true    
Document Period End Date Dec. 31, 2022    
Current Fiscal Year End Date --12-31    
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 $.001 per Share    
Trading Symbol RHI    
Security Exchange Name NYSE    
Entity Well-known Seasoned Issuer Yes    
Entity Voluntary Filers No    
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    
ICFR Auditor Attestation Flag true    
Entity Shell Company false    
Entity Public Float     $ 8,012,399,320
Entity Common Stock, Shares Outstanding   107,698,497  
Documents Incorporated by Reference Portions of the registrant’s Definitive Proxy Statement to be mailed to stockholders in connection with the registrant’s annual meeting of stockholders, scheduled to be held in May 2023, are incorporated by reference in Part III of this report. Except as expressly incorporated by reference, the registrant’s Proxy Statement shall not be deemed to be part of this report.    
Amendment Flag false    
Document Fiscal Year Focus 2022    
Document Fiscal Period Focus FY    
Entity Central Index Key 0000315213