| Cover | Jan. 06, 2025 |
| Cover [Abstract] | |
| Document Type | 8-K |
| Amendment Flag | false |
| Document Period End Date | Jan. 06, 2025 |
| Entity File Number | 333-275887 |
| Entity Registrant Name | GMTECH INC. |
| Entity Central Index Key | 0002000762 |
| Entity Tax Identification Number | 93-3955846 |
| Entity Incorporation, State or Country Code | WY |
| Entity Address, Address Line One | 45 Rockefeller Plaza |
| Entity Address, Address Line Two | 21F |
| Entity Address, City or Town | New York |
| Entity Address, State or Province | NY |
| Entity Address, Postal Zip Code | 10111 |
| City Area Code | (646) |
| Local Phone Number | 508-0022 |
| 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 |
