v3.25.4
Cover
Mar. 02, 2026
Document Type 8-K
Amendment Flag false
Document Period End Date Mar. 02, 2026
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
Written Communications false
Soliciting Material false
Pre-commencement Tender Offer false
Pre-commencement Issuer Tender Offer false
Entity Emerging Growth Company true
Entity Ex Transition Period false
Units, each consisting of one Class A ordinary share, $0.0001 par value, and one-third of one redeemable warrant [Member]  
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 [Member]  
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 [Member]  
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