| Document and Entity Information | Dec. 19, 2024 |
| Document And Entity Information [Line Items] | |
| Document Type | 8-K |
| Document Period End Date | Dec. 19, 2024 |
| Entity Registrant Name | enGene Holdings Inc. |
| Entity Incorporation, State or Country Code | A1 |
| Entity File Number | 001-41854 |
| Entity Tax Identification Number | 00-0000000 |
| Entity Address, Address Line One | 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] | |
| Title of 12(b) Security | Common Shares |
| Trading Symbol | ENGN |
| Security Exchange Name | NASDAQ |
| Warrants, each exercisable for one Common Share, at an exercise price of $11.50 per Common Share [Member] | |
| Document And Entity Information [Line Items] | |
| Title of 12(b) Security | Warrants, each exercisable for one Common Share, at an exercise price of $11.50 per Common Share |
| Trading Symbol | ENGNW |
| Security Exchange Name | NASDAQ |
