| Document and Entity Information | Jul. 22, 2024 |
| Document And Entity Information [Line Items] | |
| Document Type | 8-K |
| Document Period End Date | Jul. 22, 2024 |
| Entity Registrant Name | enGene Holdings Inc. |
| Entity Incorporation State Country Code | A1 |
| Entity File Number | 001-41854 |
| Entity Tax Identification Number | 00-0000000 |
| Entity Address Address Line 1 | 4868 Rue Levy, Suite 220 |
| Entity Address City Or Town | Saint-Laurent |
| Entity Address State Or Province | QC |
| Entity Address Country | CA |
| Entity Address Postal Zip Code | H4R 2P1 |
| City Area Code | 514 |
| Local Phone Number | 332-4888 |
| Written Communications | false |
| Soliciting Material | false |
| Pre Commencement Tender Offer | false |
| Pre Commencement Issuer Tender Offer | false |
| Entity Emerging Growth Company | true |
| Entity Ex Transition Period | true |
| Entity Central Index Key | 0001980845 |
| Amendment Flag | false |
| Common Stock [Member] | |
| Document And Entity Information [Line Items] | |
| Security 12b Title | Common Shares |
| Trading Symbol | ENGN |
| Security Exchange Name | NASDAQ |
| Warrant [Member] | |
| Document And Entity Information [Line Items] | |
| Security 12b Title | Warrants, each exercisable for one Common Share, at an exercise price of $11.50 per Common Share |
| Trading Symbol | ENGNW |
| Security Exchange Name | NASDAQ |
