v3.26.3
Cover
Oct. 31, 2026
Document Type 8-K
Amendment Flag false
Document Period End Date Oct. 31, 2026
Entity File Number 001-43056
Entity Registrant Name FG Imperii Acquisition Corp.
Entity Central Index Key 0002090452
Entity Tax Identification Number 98-1884449
Entity Incorporation, State or Country Code E9
Entity Address, Address Line One 104 S. Walnut Street
Entity Address, Address Line Two Unit 1A
Entity Address, City or Town Itasca
Entity Address, State or Province IL
Entity Address, Postal Zip Code 60143
City Area Code 847
Local Phone Number 791 6817
Written Communications true
Soliciting Material false
Pre-commencement Tender Offer false
Pre-commencement Issuer Tender Offer false
Entity Emerging Growth Company true
Elected Not To Use the Extended Transition Period false
Ordinary Shares  
Title of 12(b) Security Ordinary Shares
Trading Symbol FGII
Security Exchange Name NASDAQ
Warrants  
Title of 12(b) Security Warrants
Trading Symbol FGII.W
Security Exchange Name NASDAQ
Units  
Title of 12(b) Security Units
Trading Symbol FGII.U
Security Exchange Name NASDAQ