v3.26.1
Cover - shares
 6 Months Ended
Jun. 30, 2026
Aug. 26, 2026
Document Information [Line Items]    
Document Type 10-Q  
Amendment Flag false  
Document Quarterly Report true  
Document Transition Report false  
Document Period End Date Jun. 30, 2026  
Document Fiscal Year Focus 2026  
Document Fiscal Period Focus Q2  
Current Fiscal Year End Date --12-31  
Entity Registrant Name BOA ACQUISITION CORP. II  
Entity Central Index Key 0002080216  
Entity File Number 001-43433  
Entity Tax Identification Number 00-0000000  
Entity Incorporation, State or Country Code E9  
Entity Address, Address Line One 2600 Virginia Ave NW  
Entity Address, Address Line Two Suite T23 Management Office  
Entity Address, City or Town Washington  
Entity Address, State or Province DC  
Entity Address, Postal Zip Code 20037  
City Area Code 888  
Local Phone Number 211-3261  
Entity Current Reporting Status No  
Entity Interactive Data Current Yes  
Entity Filer Category Non-accelerated Filer  
Entity Small Business true  
Entity Emerging Growth Company true  
Entity Shell Company true  
Entity Ex Transition Period false  
Units, each consisting of one Class A Ordinary Share and one Right to one Class A Ordinary Share [Member]    
Document Information [Line Items]    
Title of 12(b) Security Units, each consisting of one Class A Ordinary Share and one Right to one Class A Ordinary Share  
Trading Symbol THEOU  
Security Exchange Name NASDAQ  
Class A Ordinary Shares, par value $0.0001 per share [Member]    
Document Information [Line Items]    
Title of 12(b) Security Class A Ordinary Shares, par value $0.0001 per share  
Trading Symbol THEO  
Security Exchange Name NASDAQ  
Entity Common Stock, Shares Outstanding   14,596,500
Rights, each right entitling the holder to receive one ordinary share [Member]    
Document Information [Line Items]    
Title of 12(b) Security Rights, each right entitling the holder to receive one ordinary share  
Trading Symbol THEOR  
Security Exchange Name NASDAQ  
Class B Ordinary Shares, par value $0.0001 per share [Member]    
Document Information [Line Items]    
Entity Common Stock, Shares Outstanding   6,160,714