v3.26.1
Document and Entity Information - shares
 3 Months Ended
Mar. 31, 2026
May 13, 2026
Document and Entity Information    
Document Type 10-Q  
Document Quarterly Report true  
Document Period End Date Mar. 31, 2026  
Document Transition Report false  
Entity File Number 001-42822  
Entity Registrant Name SPRING VALLEY ACQUISITION CORP. III  
Entity Incorporation, State or Country Code KY  
Entity Tax Identification Number 00-0000000  
Entity Address, Address Line One 4030 Maple Avenue  
Entity Address, Adress Line Two Suite 500  
Entity Address, City or Town Dallas  
Entity Address State Or Province TX  
Entity Address, Postal Zip Code 75219  
City Area Code 214  
Local Phone Number 308-5230  
Entity Current Reporting Status Yes  
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  
Entity Central Index Key 0002074850  
Current Fiscal Year End Date --12-31  
Document Fiscal Year Focus 2026  
Document Fiscal Period Focus Q1  
Amendment Flag false  
Units, each consisting of one Class A ordinary share and one-third of one redeemable warrant    
Document and Entity Information    
Title of 12(b) Security Units, each consisting of one Class A ordinary share and one-third of one redeemable warrant  
Trading Symbol SVACU  
Security Exchange Name NASDAQ  
Class A ordinary shares    
Document and Entity Information    
Title of 12(b) Security Class A ordinary shares, par value $0.0001 per share  
Trading Symbol SVAC  
Security Exchange Name NASDAQ  
Entity Common Stock, Shares Outstanding   23,000,000
Warrants, each whole warrant exercisable for one Class A ordinary share at an exercise price of $11.50    
Document and Entity Information    
Title of 12(b) Security Warrants, each whole warrant exercisable for one Class A ordinary share at an exercise price of $11.50  
Trading Symbol SVACW  
Security Exchange Name NASDAQ