Summary of Significant Accounting Policies (Policies)	6 Months Ended
Apr. 30, 2025
Accounting Policies [Abstract]
Use of Estimates	Use of Estimates The preparation of financial statements in accordance with accounting principles generally accepted in the United States of America (“GAAP”) requires management to make estimates and judgments that may affect the reported amounts of assets and liabilities and related disclosures of contingent assets and liabilities at the date of the financial statements and the related reporting of expense during the reporting period. Significant estimates of accounting reflected in these consolidated financial statements include, but are not limited to, accrued research and development expenses. Actual results could differ from those estimates.
Unaudited Interim Financial Information and Basis of Presentation	Unaudited Interim Financial Information and Basis of Presentation The accompanying unaudited interim condensed consolidated financial statements have been prepared in conformity with GAAP for interim financial reporting and accordingly, they do not include all of the information and footnotes required by GAAP for annual financial statements. The condensed consolidated balance sheet at October 31, 2024 has been derived from the audited consolidated financial statements at that date but does not include all of the information and footnotes required by GAAP for annual financial statements. These interim financial statements include the accounts of the Company and its wholly owned subsidiaries, enGene, Inc. and enGene USA, Inc. All intercompany accounts and transactions have been eliminated in consolidation. The unaudited interim condensed consolidated financial statements have been prepared on the same basis as the audited consolidated annual financial statements as of October 31, 2024 and 2023 and, in the opinion of management, reflect all adjustments, which include only normal recurring adjustments, necessary for a fair statement of the Company’s condensed consolidated balance sheet as of April 30, 2025, the condensed consolidated statements of operations for the three and six months ended April 30, 2025 and 2024, the condensed consolidated statement of shareholders' equity (deficit) for the three and six months ended April 30, 2025 and 2024, and condensed consolidated statements of cash flows for the six months ended April 30, 2025 and 2024. The financial data and other information disclosed in these notes related to the three and six months ended April 30, 2025 and 2024 are unaudited. The results for the three and six months ended April 30, 2025 and 2024, are not necessarily indicative of results to be expected for the year ending October 31, 2025, any other interim periods, or any future year or period.
Foreign Currency	Foreign Currency Transaction gains and losses from currency exchange rate fluctuations on transactions denominated in a currency other than the U.S. Dollar functional currency are recorded in Other income (expense), net in the Company's condensed consolidated statements of operations and comprehensive loss. Such transaction gain and losses may be realized or unrealized depending upon whether the transaction settled during the period or remains outstanding at the balance sheet date. The functional currency of the Company and its consolidated subsidiaries is the U.S. Dollar.
Recently Adopted Accounting Pronouncements	Recently Issued Accounting Pronouncements - Not yet adopted In November 2023, the Financial Accounting Standards Board ("FASB") issued Accounting Standards Update ("ASU") No. 2023-07, Segment Reporting (Topic 280) – Improvements to Reportable Segment Disclosures, which requires incremental disclosure of segment information on an interim and annual basis. This ASU is effective for public entities for fiscal years beginning after December 15, 2023, and interim periods within fiscal years beginning after December 15, 2024. Retrospective application to all prior periods presented in the financial statements is required for public entities. The Company is currently evaluating the impact of the guidance on the financial statements disclosures and will provide relevant disclosure in the next Annual Report on Form 10-K. In December 2023, the FASB issued ASU 2023-09, Income Taxes (Topic 740) - Improvements to Income Tax Disclosures, which improves transparency of income tax disclosures by requiring (1) consistent categories and greater disaggregation of information in the rate reconciliation and (2) income taxes paid disaggregated by jurisdiction. ASU No 2023-09 is effective for the Company's annual financial statements for the year ending October 31, 2025. The Company is currently evaluating the impact of the guidance on the financial statements disclosures. In November 2024, the FASB issued ASU 2024-03, Income Statement - Reporting Comprehensive Income- Expense Disaggregation Disclosures (Subtopic 220-40): Disaggregation of Income Statement Expenses, as further clarified by ASU 2025-01, Income Statement - Reporting Comprehensive Income- Expense Disaggregation Disclosures (Subtopic 220-40): Clarifying the Effective Date, issued in January, 2025, which requires entities to disclose additional information about specific expense categories in the notes to the financial statements. This ASU is effective for annual periods beginning after December 15, 2026 and for interim periods within fiscal years beginning after December 15, 2027. Early adoption is permitted. ASU 2024-03 may be applied retrospectively or prospectively. The Company is currently evaluating the effect of this updated standard on its consolidated financial statements and related disclosures. In October 2023, the FASB issued ASU 2023-06, Disclosure Improvements: Codification Amendments in Response to the SEC's Disclosure Update and Simplification Initiative, which amends GAAP to reflect updates and simplifications to certain disclosure and presentation requirements referred to FASB by the SEC. The targeted amendments incorporate 14 of the 27 disclosures referred by the SEC into codification. Each amendment in ASU 2023-06 is effective on the date on which the SEC's removal of the related disclosure requirement from Regulation S-X or Regulation S-K becomes effective but will not be effective if the SEC has not removed the applicable disclosure requirements by June 30, 2027. Early adoption is prohibited. The Company is currently evaluating the impact of the amendments on its financial statement disclosures.

Summary of Significant Accounting Policies (Policies)

6 Months Ended

Apr. 30, 2025

The preparation of financial statements in accordance with accounting principles generally accepted in the United States of America (“GAAP”) requires management to make estimates and judgments that may affect the reported amounts of assets and liabilities and related disclosures of contingent assets and liabilities at the date of the financial statements and the related reporting of expense during the reporting period. Significant estimates of accounting reflected in these consolidated financial statements include, but are not limited to, accrued research and development expenses. Actual results could differ from those estimates.

Unaudited Interim Financial Information and Basis of Presentation

The accompanying unaudited interim condensed consolidated financial statements have been prepared in conformity with GAAP for interim financial reporting and accordingly, they do not include all of the information and footnotes required by GAAP for annual financial statements. The condensed consolidated balance sheet at October 31, 2024 has been derived from the audited consolidated financial statements at that date but does not include all of the information and footnotes required by GAAP for annual financial statements. These interim financial statements include the accounts of the Company and its wholly owned subsidiaries, enGene, Inc. and enGene USA, Inc. All intercompany accounts and transactions have been eliminated in consolidation. The unaudited interim condensed consolidated financial statements have been prepared on the same basis as the audited consolidated annual financial statements as of October 31, 2024 and 2023 and, in the opinion of management, reflect all adjustments, which include only normal recurring adjustments, necessary for a fair statement of the Company’s condensed consolidated balance sheet as of April 30, 2025, the condensed consolidated statements of operations for the three and six months ended April 30, 2025 and 2024, the condensed consolidated statement of shareholders' equity (deficit) for the three and six months ended April 30, 2025 and 2024, and condensed consolidated statements of cash flows for the six months ended April 30, 2025 and 2024. The financial data and other information disclosed in these notes related to the three and six months ended April 30, 2025 and 2024 are unaudited. The results for the three and six months ended April 30, 2025 and 2024, are not necessarily indicative of results to be expected for the year ending October 31, 2025, any other interim periods, or any future year or period.

Foreign Currency

Transaction gains and losses from currency exchange rate fluctuations on transactions denominated in a currency other than the U.S. Dollar functional currency are recorded in Other income (expense), net in the Company's condensed consolidated statements of operations and comprehensive loss. Such transaction gain and losses may be realized or unrealized depending upon whether the transaction settled during the period or remains outstanding at the balance sheet date. The functional currency of the Company and its consolidated subsidiaries is the U.S. Dollar.

Recently Adopted Accounting Pronouncements

Recently Issued Accounting Pronouncements - Not yet adopted

In November 2023, the Financial Accounting Standards Board ("FASB") issued Accounting Standards Update ("ASU") No. 2023-07, Segment Reporting (Topic 280) – Improvements to Reportable Segment Disclosures, which requires incremental disclosure of segment information on an interim and annual basis. This ASU is effective for public entities for fiscal years beginning after December 15, 2023, and interim periods within fiscal years beginning after December 15, 2024. Retrospective application to all prior periods presented in the financial statements is required for public entities. The Company is currently evaluating the impact of the guidance on the financial statements disclosures and will provide relevant disclosure in the next Annual Report on Form 10-K.

In December 2023, the FASB issued ASU 2023-09, Income Taxes (Topic 740) - Improvements to Income Tax Disclosures, which improves transparency of income tax disclosures by requiring (1) consistent categories and greater disaggregation of information in the rate reconciliation and (2) income taxes paid disaggregated by jurisdiction. ASU No 2023-09 is effective for the Company's annual financial statements for the year ending October 31, 2025. The Company is currently evaluating the impact of the guidance on the financial statements disclosures.

In November 2024, the FASB issued ASU 2024-03, Income Statement - Reporting Comprehensive Income- Expense Disaggregation Disclosures (Subtopic 220-40): Disaggregation of Income Statement Expenses, as further clarified by ASU 2025-01, Income Statement - Reporting Comprehensive Income- Expense Disaggregation Disclosures (Subtopic 220-40): Clarifying the Effective Date, issued in January, 2025, which requires entities to disclose additional information about specific expense categories in the notes

to the financial statements. This ASU is effective for annual periods beginning after December 15, 2026 and for interim periods within fiscal years beginning after December 15, 2027. Early adoption is permitted. ASU 2024-03 may be applied retrospectively or prospectively. The Company is currently evaluating the effect of this updated standard on its consolidated financial statements and related disclosures.

In October 2023, the FASB issued ASU 2023-06, Disclosure Improvements: Codification Amendments in Response to the SEC's Disclosure Update and Simplification Initiative, which amends GAAP to reflect updates and simplifications to certain disclosure and presentation requirements referred to FASB by the SEC. The targeted amendments incorporate 14 of the 27 disclosures referred by the SEC into codification. Each amendment in ASU 2023-06 is effective on the date on which the SEC's removal of the related disclosure requirement from Regulation S-X or Regulation S-K becomes effective but will not be effective if the SEC has not removed the applicable disclosure requirements by June 30, 2027. Early adoption is prohibited. The Company is currently evaluating the impact of the amendments on its financial statement disclosures.