v3.25.2
Cover - shares
 2 Months Ended
Mar. 31, 2025
Aug. 04, 2025
Document Information [Line Items]    
Document Type 10-Q  
Document Quarterly Report true  
Document Transition Report false  
Entity Interactive Data Current Yes  
Amendment Flag false  
Document Period End Date Mar. 31, 2025  
Document Fiscal Year Focus 2025  
Document Fiscal Period Focus Q1  
Entity Information [Line Items]    
Entity Registrant Name Blue Acquisition Corp/Cayman  
Entity Central Index Key 0002059654  
Entity File Number 001-42699  
Entity Tax Identification Number 98-1855000  
Entity Incorporation, State or Country Code E9  
Current Fiscal Year End Date --12-31  
Entity Current Reporting Status No  
Entity Shell Company true  
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 1601 Anita Lane  
Entity Address, City or Town Newport Beach  
Entity Address, State or Province CA  
Entity Address, Postal Zip Code 92660-4803  
Entity Phone Fax Numbers [Line Items]    
City Area Code 646  
Local Phone Number 543-5060  
Class A Ordinary Share Units    
Entity Listings [Line Items]    
Title of 12(b) Security Units, each consisting of one Class A Ordinary Share and one Right  
Trading Symbol BACCU  
Security Exchange Name NASDAQ  
Common Class A    
Entity Listings [Line Items]    
Title of 12(b) Security Class A Ordinary Shares, par value $0.0001 per share  
Trading Symbol BACC  
Security Exchange Name NASDAQ  
Entity Common Stock, Shares Outstanding   20,892,250
Class A Ordinary Share Rights    
Entity Listings [Line Items]    
Title of 12(b) Security Class A Ordinary Share upon the consummation of an initial Business Combination  
Trading Symbol BACCR  
Security Exchange Name NASDAQ  
Class B Ordinary Shares    
Entity Listings [Line Items]    
Entity Common Stock, Shares Outstanding   7,069,913