| Document and Entity Information | Jan. 18, 2024 |
| Cover [Abstract] | |
| Document Type | 8-K |
| Amendment Flag | false |
| Document Period End Date | Jan. 23, 2024 |
| Current Fiscal Year End Date | --12-31 |
| Entity File Number | 001-41241 |
| Entity Registrant Name | HCM Acquisition Corp |
| Entity Central Index Key | 0001845368 |
| Entity Incorporation, State or Country Code | E9 |
| Entity Tax Identification Number | 98-1581263 |
| Entity Address, Address Line One | 100 First Stamford Place |
| Entity Address, Address Line Two | Suite 330 |
| Entity Address, City or Town | Stamford |
| Entity Address, State or Province | CT |
| Entity Address, Postal Zip Code | 06902 |
| City Area Code | 203 |
| Local Phone Number | 930-2200 |
| Entity Emerging Growth Company | true |
| Entity Ex Transition Period | false |
| Written Communications | false |
| Soliciting Material | false |
| Pre-commencement Tender Offer | false |
| Pre-commencement Issuer Tender Offer | false |
