v3.26.3
Cover
3 Months Ended
Jul. 31, 2026
Cover [Abstract]  
Document Type S-1/A
Amendment Flag true
Amendment Description AMENDMENT NO. 4
Entity Registrant Name YOUMI INC.
Entity Central Index Key 0002137360
Entity Tax Identification Number 32-0846641
Entity Incorporation, State or Country Code NV
Entity Address, Address Line One 732 S 6th Street
Entity Address, Address Line Two Ste V
Entity Address, City or Town Las Vegas
Entity Address, State or Province NV
Entity Address, Postal Zip Code 89101
City Area Code 929
Local Phone Number 282-9977
Entity Filer Category Non-accelerated Filer
Entity Small Business true
Entity Emerging Growth Company true
Elected Not To Use the Extended Transition Period false