v3.26.1
Document And Entity Information - shares
 6 Months Ended
Jun. 30, 2026
Aug. 10, 2026
Document Information Line Items    
Entity Central Index Key 0002077785  
Document Type 10-Q  
Document Quarterly Report true  
Document Period End Date Jun. 30, 2026  
Document Fiscal Year Focus 2026  
Document Transition Report false  
Entity File Number 001-43095  
Entity Registrant Name IRIS ACQUISITION CORP II  
Entity Incorporation, State or Country Code E9  
Entity Tax Identification Number 00-0000000  
Entity Address, Address Line One OT 09-31  
Entity Address, Address Line Two Central Park Towers Offices  
Entity Address, Address Line Three Dubai International Financial Centre PO Box 941641  
Entity Address, City or Town Dubai  
Entity Address, Country AE  
Entity Address, Postal Zip Code N/A  
City Area Code 971  
Local Phone Number 4-3966949  
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  
Amendment Flag false  
Document Fiscal Period Focus Q2  
Current Fiscal Year End Date --12-31  
Class A Ordinary Share Units    
Document Information Line Items    
Title of 12(b) Security Units, each consisting of one Class A ordinary share, par value $0.0001 per share, and one-half of one redeemable warrant  
Trading Symbol IRABU  
Security Exchange Name NYSE  
Class A Ordinary Shares    
Document Information Line Items    
Title of 12(b) Security Class A ordinary shares, par value $0.0001 per share  
Trading Symbol IRAB  
Security Exchange Name NYSE  
Entity Common Stock, Shares Outstanding   17,288,000
Class A Ordinary Share Warrants    
Document Information Line Items    
Title of 12(b) Security Warrants, each whole warrant exercisable for one Class A ordinary share at an exercise price of $11.50 per share  
Trading Symbol IRAB WS  
Security Exchange Name NYSE  
Class B Ordinary Shares    
Document Information Line Items    
Entity Common Stock, Shares Outstanding   5,616,667