<?xml version="1.0" encoding="utf-8"?>
<xbrl
  xmlns="http://www.xbrl.org/2003/instance"
  xmlns:dei="http://xbrl.sec.gov/dei/2025"
  xmlns:ffd="http://xbrl.sec.gov/ffd/2025"
  xmlns:iso4217="http://www.xbrl.org/2003/iso4217"
  xmlns:link="http://www.xbrl.org/2003/linkbase"
  xmlns:xbrldi="http://xbrl.org/2006/xbrldi"
  xmlns:xlink="http://www.w3.org/1999/xlink">
    <link:schemaRef
      xlink:href="https://xbrl.sec.gov/ffd/2025/ffd-2025.xsd"
      xlink:type="simple"/>
    <context id="C_a4d3842b-27a0-4bdd-99f2-78923687a14f">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0001980845</identifier>
        </entity>
        <period>
            <startDate>2026-03-09</startDate>
            <endDate>2026-03-09</endDate>
        </period>
    </context>
    <context id="C_b18d246d-a694-4a2c-843c-30df3add5caa">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0001980845</identifier>
            <segment>
                <xbrldi:typedMember dimension="ffd:OfferingAxis">
                    <dei:lineNo>1</dei:lineNo>
                </xbrldi:typedMember>
            </segment>
        </entity>
        <period>
            <startDate>2026-03-09</startDate>
            <endDate>2026-03-09</endDate>
        </period>
    </context>
    <context id="C_0533da44-81a9-403c-b781-1b31074b27fa">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0001980845</identifier>
            <segment>
                <xbrldi:typedMember dimension="ffd:OfferingAxis">
                    <dei:lineNo>2</dei:lineNo>
                </xbrldi:typedMember>
            </segment>
        </entity>
        <period>
            <startDate>2026-03-09</startDate>
            <endDate>2026-03-09</endDate>
        </period>
    </context>
    <unit id="U_pure">
        <measure>pure</measure>
    </unit>
    <unit id="U_shares">
        <measure>shares</measure>
    </unit>
    <unit id="U_USD">
        <measure>iso4217:USD</measure>
    </unit>
    <dei:EntityCentralIndexKey
      contextRef="C_a4d3842b-27a0-4bdd-99f2-78923687a14f"
      id="F_4b907bad-0824-47ef-a5a2-143fd3604b0b">0001980845</dei:EntityCentralIndexKey>
    <ffd:PrevslyPdFlg
      contextRef="C_0533da44-81a9-403c-b781-1b31074b27fa"
      id="F_e1f90496-3201-4a55-b5e9-74b076c059f9">false</ffd:PrevslyPdFlg>
    <ffd:PrevslyPdFlg
      contextRef="C_b18d246d-a694-4a2c-843c-30df3add5caa"
      id="F_61f1f191-3fe0-46fa-880c-d62048a0b009">false</ffd:PrevslyPdFlg>
    <ffd:OffsetTableNa
      contextRef="C_a4d3842b-27a0-4bdd-99f2-78923687a14f"
      id="F_2622beff-fa46-4558-a671-715e9c02501e">N/A</ffd:OffsetTableNa>
    <ffd:FeeExhibitTp
      contextRef="C_a4d3842b-27a0-4bdd-99f2-78923687a14f"
      id="F_6a18cb02-44a8-44b6-8ea4-b5be161c9a07">EX-FILING FEES</ffd:FeeExhibitTp>
    <ffd:FormTp
      contextRef="C_a4d3842b-27a0-4bdd-99f2-78923687a14f"
      id="F_bec06714-850f-4055-9f1f-00216bbe70e5">S-8</ffd:FormTp>
    <ffd:SubmissnTp
      contextRef="C_a4d3842b-27a0-4bdd-99f2-78923687a14f"
      id="F_abc97f56-1c95-4a66-a97f-83b9ad414595">S-8</ffd:SubmissnTp>
    <dei:EntityRegistrantName
      contextRef="C_a4d3842b-27a0-4bdd-99f2-78923687a14f"
      id="F_a7b8946d-3635-402e-ac84-b89f4f3435bd">enGene Holdings Inc.</dei:EntityRegistrantName>
    <ffd:OfferingSctyTp
      contextRef="C_b18d246d-a694-4a2c-843c-30df3add5caa"
      id="F_2c4b2dac-a744-4062-a12f-e63db7a8e67e">Equity</ffd:OfferingSctyTp>
    <ffd:OfferingSctyTitl
      contextRef="C_b18d246d-a694-4a2c-843c-30df3add5caa"
      id="F_336c616d-a620-4ff8-906a-286ed00b3682">Common Shares, no par value per share</ffd:OfferingSctyTitl>
    <ffd:FeesOthrRuleFlg
      contextRef="C_b18d246d-a694-4a2c-843c-30df3add5caa"
      id="F_b115d31b-35a0-4c7f-a61b-22afe69999f5">true</ffd:FeesOthrRuleFlg>
    <ffd:AmtSctiesRegd
      contextRef="C_b18d246d-a694-4a2c-843c-30df3add5caa"
      decimals="0"
      id="F_1016d611-4b3c-4fba-9f99-174d96e5b7ff"
      unitRef="U_shares">3349283</ffd:AmtSctiesRegd>
    <ffd:MaxOfferingPricPerScty
      contextRef="C_b18d246d-a694-4a2c-843c-30df3add5caa"
      decimals="2"
      id="F_e7bdaee3-cbdc-47cd-ac9a-0020b838746e"
      unitRef="U_USD">9.63</ffd:MaxOfferingPricPerScty>
    <ffd:MaxAggtOfferingPric
      contextRef="C_b18d246d-a694-4a2c-843c-30df3add5caa"
      decimals="2"
      id="F_12e4a674-608a-4db3-bba3-76e064f8b919"
      unitRef="U_USD">32253595.29</ffd:MaxAggtOfferingPric>
    <ffd:FeeRate
      contextRef="C_b18d246d-a694-4a2c-843c-30df3add5caa"
      decimals="8"
      id="F_958b6cbf-f9b6-449c-93e8-c483af9cba94"
      unitRef="U_pure">0.0001381</ffd:FeeRate>
    <ffd:FeeAmt
      contextRef="C_b18d246d-a694-4a2c-843c-30df3add5caa"
      decimals="2"
      id="F_83bcc0ab-0386-4cca-b73e-32bf98eeb747"
      unitRef="U_USD">4454.22</ffd:FeeAmt>
    <ffd:OfferingSctyTp
      contextRef="C_0533da44-81a9-403c-b781-1b31074b27fa"
      id="F_0a75f551-eb85-4af3-ad6f-efa32c74afd5">Equity</ffd:OfferingSctyTp>
    <ffd:OfferingSctyTitl
      contextRef="C_0533da44-81a9-403c-b781-1b31074b27fa"
      id="F_ff43195f-f511-48e0-b75e-6b98fe4a40ef">Common Shares, no par value per share</ffd:OfferingSctyTitl>
    <ffd:FeesOthrRuleFlg
      contextRef="C_0533da44-81a9-403c-b781-1b31074b27fa"
      id="F_1ee22f09-384a-4155-a456-ac4f734a761f">true</ffd:FeesOthrRuleFlg>
    <ffd:AmtSctiesRegd
      contextRef="C_0533da44-81a9-403c-b781-1b31074b27fa"
      decimals="0"
      id="F_3b02e07d-15f6-4b77-800c-05fe574597a9"
      unitRef="U_shares">657950</ffd:AmtSctiesRegd>
    <ffd:MaxOfferingPricPerScty
      contextRef="C_0533da44-81a9-403c-b781-1b31074b27fa"
      decimals="2"
      id="F_bd105cb5-7007-49a1-8aa5-0ae7d7663474"
      unitRef="U_USD">6.83</ffd:MaxOfferingPricPerScty>
    <ffd:MaxAggtOfferingPric
      contextRef="C_0533da44-81a9-403c-b781-1b31074b27fa"
      decimals="2"
      id="F_90b9d782-01da-4110-aab8-e099eb48386b"
      unitRef="U_USD">4493798.5</ffd:MaxAggtOfferingPric>
    <ffd:FeeRate
      contextRef="C_0533da44-81a9-403c-b781-1b31074b27fa"
      decimals="8"
      id="F_04ecdd8f-abed-4db7-96aa-aca3b1890176"
      unitRef="U_pure">0.0001381</ffd:FeeRate>
    <ffd:FeeAmt
      contextRef="C_0533da44-81a9-403c-b781-1b31074b27fa"
      decimals="2"
      id="F_8e276a2c-cc1c-408a-89c2-94148125a694"
      unitRef="U_USD">620.59</ffd:FeeAmt>
    <ffd:TtlOfferingAmt
      contextRef="C_a4d3842b-27a0-4bdd-99f2-78923687a14f"
      decimals="2"
      id="F_23ca2bfb-55b7-4503-9e2d-796d9729406e"
      unitRef="U_USD">36747393.79</ffd:TtlOfferingAmt>
    <ffd:TtlFeeAmt
      contextRef="C_a4d3842b-27a0-4bdd-99f2-78923687a14f"
      decimals="2"
      id="F_e81cf243-ecc2-43a0-9c18-c6817a9457db"
      unitRef="U_USD">5074.81</ffd:TtlFeeAmt>
    <ffd:TtlOffsetAmt
      contextRef="C_a4d3842b-27a0-4bdd-99f2-78923687a14f"
      decimals="0"
      id="F_4f0ed9e7-0da3-4b7f-b1d2-0e05366593de"
      unitRef="U_USD">0</ffd:TtlOffsetAmt>
    <ffd:NetFeeAmt
      contextRef="C_a4d3842b-27a0-4bdd-99f2-78923687a14f"
      decimals="2"
      id="F_fef187b5-0cdf-4402-9a68-61dd6818647f"
      unitRef="U_USD">5074.81</ffd:NetFeeAmt>
    <ffd:OfferingNote
      contextRef="C_b18d246d-a694-4a2c-843c-30df3add5caa"
      id="F_aa31ad8e-45ea-4fd7-be21-8639ca7dcc90">&lt;div&gt;&lt;p style="font-size:10pt;margin-top:15pt;font-family:Times New Roman;margin-bottom:0;text-align:justify;"&gt;&lt;span style="color:#000000;white-space:pre-wrap;font-size:10pt;font-family:Times New Roman;font-kerning:none;min-width:fit-content;"&gt;(1) Pursuant to Rule 416 under the Securities Act of 1933, as amended (the &#x201c;Securities Act&#x201d;), the registrant is also registering an indeterminate number of additional common shares, without par value (the &#x201c;Common Shares&#x201d;) that may become issuable as a result of any stock dividend, stock split, recapitalization or other similar transaction.&lt;/span&gt;&lt;/p&gt;&lt;/div&gt;&lt;p style="font-size:10pt;margin-top:6pt;font-family:Times New Roman;margin-bottom:0;text-align:justify;"&gt;&lt;span style="color:#000000;white-space:pre-wrap;font-size:10pt;font-family:Times New Roman;font-kerning:none;min-width:fit-content;"&gt;(2) Consists of 3,349,283 additional Common Shares issuable under the Amended and Restated enGene Holdings Inc. 2023 Incentive Equity Plan (the &#x201c;Plan&#x201d;), which represents the automatic annual increase to the number of shares available for issuance under the Plan as of January 1, 2026.&lt;/span&gt;&lt;/p&gt;&lt;p style="font-size:10pt;margin-top:6pt;font-family:Times New Roman;margin-bottom:0;text-align:justify;"&gt;&lt;span style="color:#000000;white-space:pre-wrap;font-size:10pt;font-family:Times New Roman;font-kerning:none;min-width:fit-content;"&gt;(3) Estimated in accordance with Rule 457(c) and Rule 457(h) promulgated under the Securities Act solely for the purpose of calculating the registration fee based on the average of the high and low prices of the Common Shares as reported on the Nasdaq Capital Market on March 3, 2026.&lt;/span&gt;&lt;span style="color:#000000;white-space:pre-wrap;font-size:10pt;font-family:Times New Roman;font-kerning:none;min-width:fit-content;"&gt; &lt;/span&gt;&lt;/p&gt;</ffd:OfferingNote>
    <ffd:OfferingNote
      contextRef="C_0533da44-81a9-403c-b781-1b31074b27fa"
      id="F_1ea29313-9711-400a-a7f7-fb84dd69fdda">&lt;p style="font-size:10pt;margin-top:15pt;font-family:Times New Roman;margin-bottom:0;text-align:justify;"&gt;&lt;span style="color:#000000;white-space:pre-wrap;font-size:10pt;font-family:Times New Roman;font-kerning:none;min-width:fit-content;"&gt;(1) Pursuant to Rule 416 under the Securities Act of 1933, as amended (the &#x201c;Securities Act&#x201d;), the registrant is also registering an indeterminate number of additional common shares, without par value (the &#x201c;Common Shares&#x201d;) that may become issuable as a result of any stock dividend, stock split, recapitalization or other similar transaction.&lt;/span&gt;&lt;/p&gt;&lt;p style="font-size:10pt;margin-top:6pt;font-family:Times New Roman;margin-bottom:0;text-align:justify;"&gt;&lt;span style="color:#000000;white-space:pre-wrap;font-size:10pt;font-family:Times New Roman;font-kerning:none;min-width:fit-content;"&gt;(4) Represents the maximum number of Common Shares issuable pursuant to the inducement stock option awards made pursuant to and in accordance with the inducement grant exception under Nasdaq Listing Rule 5635(c)(4).&lt;/span&gt;&lt;/p&gt;&lt;p style="font-size:10pt;margin-top:6pt;font-family:Times New Roman;margin-bottom:0;text-align:justify;"&gt;&lt;span style="color:#000000;white-space:pre-wrap;font-size:10pt;font-family:Times New Roman;font-kerning:none;min-width:fit-content;"&gt;(5) Estimated in accordance with Rule 457(h) promulgated under the Securities Act solely for the purpose of calculating the registration fee based upon the exercise price of the inducement options.&lt;/span&gt;&lt;/p&gt;</ffd:OfferingNote>
</xbrl>
