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<xbrl
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  xmlns:dei="http://xbrl.sec.gov/dei/2025"
  xmlns:ffd="http://xbrl.sec.gov/ffd/2025"
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    <link:schemaRef
      xlink:href="https://xbrl.sec.gov/ffd/2025/ffd-2025.xsd"
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    <context id="c_offering_1">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0001969863</identifier>
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                    <dei:lineNo>1</dei:lineNo>
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        <period>
            <startDate>2026-05-28</startDate>
            <endDate>2026-05-28</endDate>
        </period>
    </context>
    <context id="c_offset_1">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0001969863</identifier>
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        <period>
            <startDate>2026-05-28</startDate>
            <endDate>2026-05-28</endDate>
        </period>
    </context>
    <context id="c_offset_2">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0001969863</identifier>
            <segment>
                <xbrldi:typedMember dimension="ffd:OffsetAxis">
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        <period>
            <startDate>2026-05-28</startDate>
            <endDate>2026-05-28</endDate>
        </period>
    </context>
    <context id="c_report">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0001969863</identifier>
        </entity>
        <period>
            <startDate>2026-05-28</startDate>
            <endDate>2026-05-28</endDate>
        </period>
    </context>
    <unit id="USD">
        <measure>iso4217:USD</measure>
    </unit>
    <unit id="pure">
        <measure>pure</measure>
    </unit>
    <unit id="shares">
        <measure>shares</measure>
    </unit>
    <ffd:SubmissnTp contextRef="c_report" id="fee_001">F-1</ffd:SubmissnTp>
    <ffd:FeeExhibitTp contextRef="c_report" id="fee_002">EX-FILING FEES</ffd:FeeExhibitTp>
    <dei:EntityCentralIndexKey contextRef="c_report" id="fee_003">0001969863</dei:EntityCentralIndexKey>
    <ffd:OffsetClmdInd contextRef="c_offset_1" id="fee_004">true</ffd:OffsetClmdInd>
    <ffd:OffsetClmdInd contextRef="c_offset_2" id="fee_005">false</ffd:OffsetClmdInd>
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    <ffd:OffsetTableNa contextRef="c_report" id="fee_007" xsi:nil="true"/>
    <ffd:CombinedProspectusTableNa contextRef="c_report" id="fee_008">N/A</ffd:CombinedProspectusTableNa>
    <ffd:FormTp contextRef="c_report" id="fee_009">F-1</ffd:FormTp>
    <dei:EntityRegistrantName contextRef="c_report" id="fee_010">SU Group Holdings Ltd</dei:EntityRegistrantName>
    <ffd:PrevslyPdFlg contextRef="c_offering_1" id="fee_011">false</ffd:PrevslyPdFlg>
    <ffd:OfferingSctyTp contextRef="c_offering_1" id="fee_012">Equity</ffd:OfferingSctyTp>
    <ffd:OfferingSctyTitl contextRef="c_offering_1" id="fee_013">Class A Ordinary Shares issuable upon exercise of Warrants</ffd:OfferingSctyTitl>
    <ffd:FeesOthrRuleFlg contextRef="c_offering_1" id="fee_014">true</ffd:FeesOthrRuleFlg>
    <ffd:AmtSctiesRegd
      contextRef="c_offering_1"
      decimals="0"
      id="fee_015"
      unitRef="shares">38317241</ffd:AmtSctiesRegd>
    <ffd:MaxOfferingPricPerScty
      contextRef="c_offering_1"
      decimals="INF"
      id="fee_016"
      unitRef="USD">0.97</ffd:MaxOfferingPricPerScty>
    <ffd:MaxAggtOfferingPric
      contextRef="c_offering_1"
      decimals="INF"
      id="fee_017"
      unitRef="USD">37167723.77</ffd:MaxAggtOfferingPric>
    <ffd:FeeRate
      contextRef="c_offering_1"
      decimals="INF"
      id="fee_018"
      unitRef="pure">0.0001381</ffd:FeeRate>
    <ffd:FeeAmt
      contextRef="c_offering_1"
      decimals="INF"
      id="fee_019"
      unitRef="USD">5132.86</ffd:FeeAmt>
    <ffd:TtlOfferingAmt
      contextRef="c_report"
      decimals="INF"
      id="fee_020"
      unitRef="USD">37167723.77</ffd:TtlOfferingAmt>
    <ffd:TtlFeeAmt
      contextRef="c_report"
      decimals="INF"
      id="fee_021"
      unitRef="USD">5132.86</ffd:TtlFeeAmt>
    <ffd:TtlPrevslyPdAmt
      contextRef="c_report"
      decimals="INF"
      id="fee_022"
      unitRef="USD">0.00</ffd:TtlPrevslyPdAmt>
    <ffd:TtlOffsetAmt
      contextRef="c_report"
      decimals="INF"
      id="fee_023"
      unitRef="USD">5132.86</ffd:TtlOffsetAmt>
    <ffd:NetFeeAmt
      contextRef="c_report"
      decimals="INF"
      id="fee_024"
      unitRef="USD">0.00</ffd:NetFeeAmt>
    <ffd:OfferingNote contextRef="c_offering_1" id="fee_025">Pursuant to Rule 416 under the Securities Act of 1933, as amended (the &#x201c;Securities Act&#x201d;), there are also being registered such indeterminate number of additional shares as may be issued to prevent dilution resulting from share splits, share dividends or similar transactions.&lt;br/&gt;&lt;br/&gt;Represents 120% of the maximum number of Class A ordinary shares that may be issuable upon exercise of the Warrants (after giving effect to the number of Class A ordinary shares that were registered on a prior registration statement (File No. 333-291851), based on the initial exercise price floor contained in the Warrants.&lt;br/&gt;&lt;br/&gt;Estimated solely for the purpose of calculating the registration fee in accordance with Rule 457(c) under the Securities Act, based on the average of the high ($1.13) and low ($0.819) prices of the Class A ordinary shares as reported on the Nasdaq Capital Market on June 8, 2026 (such date being within five business days of the date that this registration statement was first filed with the Securities and Exchange Commission in accordance with Rule 457(c) under the Securities Act).&lt;br/&gt;</ffd:OfferingNote>
    <ffd:Rule457pOffsetFlg contextRef="c_offset_1" id="fee_026">true</ffd:Rule457pOffsetFlg>
    <ffd:OffsetPrrFilerNm contextRef="c_offset_1" id="fee_027">SU Group Holdings Ltd</ffd:OffsetPrrFilerNm>
    <ffd:OffsetPrrFormTp contextRef="c_offset_1" id="fee_028">F-1</ffd:OffsetPrrFormTp>
    <ffd:OffsetPrrFileNb contextRef="c_offset_1" id="fee_029">333-291851</ffd:OffsetPrrFileNb>
    <ffd:OffsetClmInitlFilgDt contextRef="c_offset_1" id="fee_030">2025-11-28</ffd:OffsetClmInitlFilgDt>
    <ffd:OffsetClmdAmt
      contextRef="c_offset_1"
      decimals="INF"
      id="fee_031"
      unitRef="USD">5132.86</ffd:OffsetClmdAmt>
    <ffd:OffsetPrrSctyTp contextRef="c_offset_1" id="fee_032">Equity</ffd:OffsetPrrSctyTp>
    <ffd:OffsetPrrSctyTitl contextRef="c_offset_1" id="fee_033">Units, each consisting</ffd:OffsetPrrSctyTitl>
    <ffd:OffsetPrrNbOfUnsoldScties
      contextRef="c_offset_1"
      decimals="INF"
      id="fee_034"
      unitRef="pure">9000000</ffd:OffsetPrrNbOfUnsoldScties>
    <ffd:OffsetPrrUnsoldOfferingAmt
      contextRef="c_offset_1"
      decimals="INF"
      id="fee_035"
      unitRef="USD">8948.88</ffd:OffsetPrrUnsoldOfferingAmt>
    <ffd:Rule457pOffsetFlg contextRef="c_offset_2" id="fee_036">true</ffd:Rule457pOffsetFlg>
    <ffd:OffsetPrrFilerNm contextRef="c_offset_2" id="fee_037">SU Group Holdings Ltd</ffd:OffsetPrrFilerNm>
    <ffd:OffsetPrrFormTp contextRef="c_offset_2" id="fee_038">F-1</ffd:OffsetPrrFormTp>
    <ffd:OffsetPrrFileNb contextRef="c_offset_2" id="fee_039">333-291851</ffd:OffsetPrrFileNb>
    <ffd:OffsetSrcFilgDt contextRef="c_offset_2" id="fee_040">2025-11-28</ffd:OffsetSrcFilgDt>
    <ffd:OffsetPrrFeeAmt
      contextRef="c_offset_2"
      decimals="INF"
      id="fee_041"
      unitRef="USD">5132.86</ffd:OffsetPrrFeeAmt>
    <ffd:TermntnCmpltnWdrwl contextRef="c_offset_1" id="fee_042">(1) The registrant initially filed a registration statement on Form F-1 (File No. 333-291851) on November 11, 2025. In connection with such registration statement, the registrant paid an aggregate of $15,163.38 in filing fees. A post-effective amendment to such registration statement was filed on February 3, 2026 that reduced the number of securities being offered pursuant to such registration statement. On April 17, 2026, another post-effective amendment to such registration statement was filed that reduced the proposed maximum aggregate offering price of such registration statement. The offering on such registration statement was completed on May 13, 2026. As of the completion of such offering, an amount of $8,948.88 remained available for future fee offsets. Pursuant to Rule 457(p), an amount of $5,132.86 of the previously paid filing fees are applied as an offset to the registration statement to which this Exhibit 107 relates, and no additional filing fees are required for the registration statement to which this Exhibit 107 relates. As of the date of this filing there is $3,816.02 remaining for future fee offsets.&lt;br/&gt;&lt;br/&gt;</ffd:TermntnCmpltnWdrwl>
    <ffd:OffsetNote contextRef="c_offset_2" id="fee_043">The registrant initially filed a registration statement on Form F-1 (File No. 333-291851) on November 11, 2025. In connection with such registration statement, the registrant paid an aggregate of $15,163.38 in filing fees. A post-effective amendment to such registration statement was filed on February 3, 2026 that reduced the number of securities being offered pursuant to such registration statement. On April 17, 2026, another post-effective amendment to such registration statement was filed that reduced the proposed maximum aggregate offering price of such registration statement. The offering on such registration statement was completed on May 13, 2026. As of the completion of such offering, an amount of $8,948.88 remained available for future fee offsets. Pursuant to Rule 457(p), an amount of $5,132.86 of the previously paid filing fees are applied as an offset to the registration statement to which this Exhibit 107 relates, and no additional filing fees are required for the registration statement to which this Exhibit 107 relates. As of the date of this filing there is $3,816.02 remaining for future fee offsets.</ffd:OffsetNote>
</xbrl>
