Share-Based Compensation - Additional Information (Details) $ / shares in Units, $ in Millions				3 Months Ended
	Jan. 01, 2026	Jun. 10, 2025 $ / shares shares	May 15, 2024 shares	Jan. 31, 2026 USD ($) $ / shares $ / shares shares	Jan. 31, 2025 $ / shares shares	Oct. 31, 2025 $ / shares shares
Share-Based Compensation Arrangement by Share-Based Payment Award [Line Items]
Unrecognized compensation expense \| $				$ 49.5
Common stock shares reserved for future issuance				28,486,130		22,478,570
Shares Granted				3,161,490
Common stock no par value \| $ / shares				$ 0		$ 0
Unrecognized compensation expense weighted-average period of recognition				3 years 3 months 18 days
Weighted-average grant-date fair value per share of share options granted \| $ / shares				$ 6.9	$ 5.33
Evergreen Provision
Share-Based Compensation Arrangement by Share-Based Payment Award [Line Items]
Aggregate number of common shares outstanding percentage	5.00%
Restricted share units
Share-Based Compensation Arrangement by Share-Based Payment Award [Line Items]
Share-based compensation, service period				4 years
Common stock shares reserved for future issuance				272,925
2025 Employee Stock Purchase Plan [Member]
Share-Based Compensation Arrangement by Share-Based Payment Award [Line Items]
Common stock shares reserved for future issuance		2,000,000
Common stock capital shares reserved for remaining future issuance				2,000,000
Common stock no par value \| $ / shares		$ 0
Shares issued				0
Percentage of common stock value on date of grant		85.00%
2023 Plan \| Evergreen Provision
Share-Based Compensation Arrangement by Share-Based Payment Award [Line Items]
Common stock shares reserved for future issuance				13,041,358
Common stock capital shares reserved for remaining future issuance				2,848,172
Aggregate number of common shares outstanding percentage			5.00%
Issuance of common shares			2,500,000
Number of shares authorized increased				3,349,283
2023 Plan \| Employee Stock Option [Member]
Share-Based Compensation Arrangement by Share-Based Payment Award [Line Items]
Percentage of common stock value on date of grant			100.00%
Inducement Grants \| Nonqualified Stock Options
Share-Based Compensation Arrangement by Share-Based Payment Award [Line Items]
Shares Granted				0	360,300
Shares Vested				689,016
Shares forfeited				37,200
Stock option expired				0

enGene Holdings Inc. 10-Q