| Document And Entity Information | Mar. 29, 2024 |
| Cover [Abstract] | |
| Document Type | 8-K |
| Amendment Flag | false |
| Document Period End Date | Mar. 29, 2024 |
| Entity Registrant Name | iAnthus Capital Holdings, Inc. |
| Entity Central Index Key | 0001643154 |
| Entity Emerging Growth Company | true |
| Entity File Number | 000-56228 |
| Entity Incorporation, State or Country Code | A1 |
| Entity Tax Identification Number | 98-1360810 |
| Entity Address, Address Line One | 214 King Street West |
| Entity Address, Address Line Two | Suite 314 |
| Entity Address, City or Town | Toronto |
| Entity Address, State or Province | ON |
| Entity Address, Postal Zip Code | M5H 3S6 |
| City Area Code | (646) |
| Local Phone Number | 518-9418 |
| Written Communications | false |
| Soliciting Material | false |
| Pre-commencement Tender Offer | false |
| Pre-commencement Issuer Tender Offer | false |
| Entity Ex Transition Period | false |
| Title of 12(b) Security | N/A |
| No Trading Symbol Flag | true |
| Security Exchange Name | NONE |
