v3.26.1
Cover - shares
3 Months Ended
Feb. 28, 2026
Apr. 14, 2026
Document Type 10-Q  
Amendment Flag false  
Document Quarterly Report true  
Document Transition Report false  
Document Period End Date Feb. 28, 2026  
Document Fiscal Period Focus Q1  
Document Fiscal Year Focus 2026  
Current Fiscal Year End Date --11-30  
Entity File Number 001-43169  
Entity Registrant Name ILLUMINATION ACQUISITION CORP I  
Entity Central Index Key 0002101135  
Entity Tax Identification Number 00-0000000  
Entity Incorporation, State or Country Code E9  
Entity Address, Address Line One 570 Lexington Avenue  
Entity Address, Address Line Two 40th Floor  
Entity Address, City or Town New York  
Entity Address, State or Province NY  
Entity Address, Postal Zip Code 10022  
City Area Code 646  
Local Phone Number 348-9369  
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 Ex Transition Period false  
Entity Shell Company true  
Entity Common Stock, Shares Outstanding   31,291,667
Units, each consisting of one Class A ordinary share, $0.0001 par value, and one-third of one redeemable warrant    
Title of 12(b) Security Units, each consisting of one Class A ordinary share, $0.0001 par value, and one-third of one redeemable warrant  
Trading Symbol ILLUU  
Security Exchange Name NASDAQ  
Class A Ordinary shares, par value $0.0001 per share    
Title of 12(b) Security Class A Ordinary shares, par value $0.0001 per share  
Trading Symbol ILLU  
Security Exchange Name NASDAQ  
Redeemable warrants, each exercisable for Class A ordinary shares at an exercise price of $11.50 per share    
Title of 12(b) Security Redeemable warrants, each exercisable for Class A ordinary shares at an exercise price of $11.50 per share  
Trading Symbol ILLUW  
Security Exchange Name NASDAQ