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Document and Entity Information - USD ($)
 12 Months Ended
Dec. 31, 2025
Apr. 14, 2026
Jun. 30, 2025
Document and Entity Information      
Document Type 10-K    
Document Annual Report true    
Document Period End Date Dec. 31, 2025    
Document Transition Report false    
Securities Act File Number 001-42692    
Entity Registrant Name Blue Water Acquisition Corp. III    
Entity Incorporation, State or Country Code E9    
Entity Tax Identification Number 00-0000000    
Entity Address, Address Line One 1012 Springfield Avenue    
Entity Address, City or Town Mountainside    
Entity Address, State or Province NJ    
Entity Address, Postal Zip Code 07092    
City Area Code 201    
Local Phone Number 985-8300    
Entity Well-known Seasoned Issuer No    
Entity Voluntary Filers No    
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    
ICFR Auditor Attestation Flag false    
Document Financial Statement Error Correction [Flag] false    
Entity Shell Company true    
Entity Public Float     $ 253,253,000
Auditor Name Elliott Davis, PLLC    
Auditor Firm ID 149    
Auditor Location Charlotte, North Carolina    
Entity Central Index Key 0002050501    
Amendment Flag false    
Current Fiscal Year End Date --12-31    
Document Fiscal Period Focus FY    
Document Fiscal Year Focus 2025    
Units, each consisting of one Class A ordinary share, $0.0001 par value, and one-half of one redeemable warrant      
Document and Entity Information      
Trading Symbol BLUWU    
Security Exchange Name NASDAQ    
Title of 12(b) Security Units, each consisting of one Class A ordinary share, $0.0001 par value, and one-half of one redeemable warrant    
Class A ordinary shares, $0.0001 par value      
Document and Entity Information      
Trading Symbol BLUW    
Security Exchange Name NASDAQ    
Title of 12(b) Security Class A ordinary shares, $0.0001 par value    
Entity Common Stock, Shares Outstanding   25,983,000  
Redeemable warrants, each whole warrant exercisable for one Class A ordinary share at an exercise price of $11.50 per share      
Document and Entity Information      
Trading Symbol BLUWW    
Security Exchange Name NASDAQ    
Title of 12(b) Security Redeemable warrants, each whole warrant exercisable for one Class A ordinary share at an exercise price of $11.50 per share    
Common Class B [Member]      
Document and Entity Information      
Entity Common Stock, Shares Outstanding   6,325,000