Related Party Transactions - Additional Information (Details) - USD ($)					12 Months Ended
	Oct. 29, 2024	Feb. 20, 2024	May 16, 2023	Apr. 04, 2023	Oct. 31, 2024	Oct. 31, 2023
Related Party Transaction [Line Items]
Amount of convertible debentures and warrants			$ 38,000,000
Cash						$ 81,500,000
Initial maturity period			3 years
Accrued interest percentage			10.00%
Dividends or distributions declared or paid						$ 0
Exchange ratio					0.18048%	0.18048%
Common stock shares issued					50,976,676	23,197,976
Warrants to purchase shares of common stock						2,679,432
2024 PIPE Investors
Related Party Transaction [Line Items]
Issuance of common shares	561,797	800,000
Issuance of common shares, value	$ 5,000,000	$ 8,000,000
Private Placement | 2024 Subscription Agreements
Related Party Transaction [Line Items]
Issuance of common shares	6,758,311	20,000,000
Common shares price per share	$ 8.9	$ 10
Company Shareholders
Related Party Transaction [Line Items]
Amount of convertible debentures and warrants			$ 8,000,000
Forbion Growth Sponsor FEAC I B.V
Related Party Transaction [Line Items]
Amount of convertible debentures and warrants			20,000,000
Common stock shares issued						2,262,351
Number of securities into which the class of warrant or right may be converted						950,153
Investissement Quebec
Related Party Transaction [Line Items]
Amount of convertible debentures and warrants			10,000,000
FEAC
Related Party Transaction [Line Items]
Common stock shares issued						3,670,927
Number of securities into which the class of warrant or right may be converted						5,029,444
Old enGene's Equity and Convertible Note Holders
Related Party Transaction [Line Items]
Common stock shares issued						13,091,608
April 2023 Notes
Related Party Transaction [Line Items]
Principal amount				$ 8,000,000
Interest rate				15.00%
Amount of convertible debentures and warrants				$ 8,000,000
Maturity date				Jul. 31, 2023
Settlement and extinguishment				$ 8,000,000
Repayment			8,000,000
May 2023 Notes
Related Party Transaction [Line Items]
Amount of convertible debentures and warrants			30,000,000
May 2023 Financing
Related Party Transaction [Line Items]
Amount of convertible debentures and warrants			28,000,000
Cash			20,000,000
June 2023 Financing
Related Party Transaction [Line Items]
Principal amount			10,000,000
Cash			$ 10,000,000
Minimum
Related Party Transaction [Line Items]
Percentage of shares owned by shareholders					10.00%	10.00%
Minimum | April 2023 Notes
Related Party Transaction [Line Items]
Aggregate sale of convertible promissory notes, warrants, preferred shares, common shares, or combined thereof				$ 20,000,000