v3.26.1
Cover Page
4 Months Ended 6 Months Ended
Feb. 25, 2026
Jun. 30, 2026
Jun. 30, 2026
Document Information [Line Items]      
Document Type     S-4
Entity Registrant Name     Research Alliance Corporation III
Entity Incorporation, State or Country Code     E9
Entity Tax Identification Number     98-1918931
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
Amendment Flag     false
Entity Central Index Key     0002118032
Entity Filer Category     Non-accelerated Filer
Entity Small Business     true
Entity Emerging Growth Company     true
Entity Ex Transition Period     false
Inception Date Feb. 19, 2026 Feb. 19, 2026  
Entity Primary SIC Number     6770
Business Contact [Member]      
Document Information [Line Items]      
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
Contact Personnel Name     Matthew D. Hammond