v3.26.1
Cover Page - shares
1 Months Ended
Mar. 31, 2026
Jun. 24, 2026
Document Information [Line Items]    
Document Type 10-Q  
Amendment Flag false  
Document Quarterly Report true  
Document Transition Report false  
Document Period End Date Mar. 31, 2026  
Document Fiscal Year Focus 2026  
Document Fiscal Period Focus Q1  
Current Fiscal Year End Date --12-31  
Entity Tax Identification Number 98-1918931  
Entity File Number 001-43302  
Entity Registrant Name Research Alliance Corporation III  
Entity Central Index Key 0002118032  
Entity Incorporation, State or Country Code E9  
Entity Address, Address Line One 600 Fifth Avenue  
Entity Address, Address Line Two 23rd Floor  
Entity Address, City or Town New York  
Entity Address, State or Province NY  
Entity Address, Postal Zip Code 10020  
City Area Code 617  
Local Phone Number 778-2500  
Title of 12(b) Security Class A Ordinary Shares, par value $0.0001 per share  
Trading Symbol RACC  
Security Exchange Name NASDAQ  
Entity Current Reporting Status No  
Entity Interactive Data Current Yes  
Entity Filer Category Non-accelerated Filer  
Entity Small Business true  
Entity Emerging Growth Company true  
Entity Ex Transition Period false  
Entity Shell Company true  
Inception Date Feb. 19, 2026  
Common Class A [Member]    
Document Information [Line Items]    
Entity Common Stock, Shares Outstanding   7,775,000
Common Class B [Member]    
Document Information [Line Items]    
Entity Common Stock, Shares Outstanding   1,323,529