v3.26.3
Cover
Oct. 16, 2026
Document Type 8-K
Amendment Flag false
Document Period End Date Oct. 16, 2026
Entity File Number 001-42888
Entity Registrant Name Fermi Inc.
Entity Central Index Key 0002071778
Entity Tax Identification Number 33-3560468
Entity Incorporation, State or Country Code TX
Entity Address, Address Line One 1845 Woodall Rodgers Fwy
Entity Address, Address Line Two Suite 1100
Entity Address, City or Town Dallas
Entity Address, State or Province TX
Entity Address, Postal Zip Code 75201
City Area Code 214
Local Phone Number 894-7855
Written Communications false
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 true
Common Stock, $0.001 par value  
Title of 12(b) Security Common Stock, $0.001 par value
Trading Symbol FRMI
Security Exchange Name NASDAQ
Common Stocka 0. 001 Par Value [Member]  
Title of 12(b) Security Common Stock, $0.001 par value
Trading Symbol FRMI