v3.26.1
Cover
May 12, 2026
Document Information [Line Items]  
Document Type S-1/A
Amendment Flag true
Amendment Description AMENDMENT NO. 2
Entity Information [Line Items]  
Entity Registrant Name Research Alliance Corporation III
Entity Central Index Key 0002118032
Entity Primary SIC Number 6770
Entity Tax Identification Number 98-1918931
Entity Incorporation, State or Country Code E9
Entity Filer Category Non-accelerated Filer
Entity Small Business true
Entity Emerging Growth Company true
Entity Ex Transition Period false
Entity Contact Personnel [Line Items]  
Entity Address, Address Line One 600 Fifth Avenue, 23rd Floor
Entity Address, Address Line Two New York
Entity Address, City or Town NY
Entity Address, Postal Zip Code 10020
Entity Phone Fax Numbers [Line Items]  
City Area Code 617
Local Phone Number 778 2500
Business Contact [Member]  
Entity Contact Personnel [Line Items]  
Contact Personnel Name Matthew Hammond
Entity Address, Address Line One 600 Fifth Avenue, 23rd Floor
Entity Address, Address Line Two New York
Entity Address, City or Town NY
Entity Address, Postal Zip Code 10020
Entity Phone Fax Numbers [Line Items]  
City Area Code 617
Local Phone Number 778 2500