<?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"
  xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance">
    <link:schemaRef
      xlink:href="https://xbrl.sec.gov/ffd/2025/ffd-2025.xsd"
      xlink:type="simple"/>
    <context id="AsOf2026-06-11">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0002093507</identifier>
        </entity>
        <period>
            <startDate>2026-06-11</startDate>
            <endDate>2026-06-11</endDate>
        </period>
    </context>
    <context id="From2026-06-112026-06-11_1">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0002093507</identifier>
            <segment>
                <xbrldi:typedMember dimension="ffd:OfferingAxis">
                    <dei:lineNo>1</dei:lineNo>
                </xbrldi:typedMember>
            </segment>
        </entity>
        <period>
            <startDate>2026-06-11</startDate>
            <endDate>2026-06-11</endDate>
        </period>
    </context>
    <unit id="USD">
        <measure>iso4217:USD</measure>
    </unit>
    <unit id="Shares">
        <measure>shares</measure>
    </unit>
    <unit id="USDPShares">
        <divide>
            <unitNumerator>
                <measure>iso4217:USD</measure>
            </unitNumerator>
            <unitDenominator>
                <measure>shares</measure>
            </unitDenominator>
        </divide>
    </unit>
    <unit id="Ratio">
        <measure>pure</measure>
    </unit>
    <dei:EntityCentralIndexKey contextRef="AsOf2026-06-11" id="Fact000003">0002093507</dei:EntityCentralIndexKey>
    <ffd:FeeExhibitTp contextRef="AsOf2026-06-11" id="xdx2ixbrl0009">EX-FILING FEES</ffd:FeeExhibitTp>
    <ffd:TtlOffsetAmt
      contextRef="AsOf2026-06-11"
      id="xdx2ixbrl0025"
      unitRef="USD"
      xsi:nil="true"/>
    <ffd:SubmissnTp contextRef="AsOf2026-06-11" id="Fact000010">S-8</ffd:SubmissnTp>
    <ffd:FormTp contextRef="AsOf2026-06-11" id="Fact000011">S-8</ffd:FormTp>
    <ffd:OffsetTableNa contextRef="AsOf2026-06-11" id="Fact000012">N/A</ffd:OffsetTableNa>
    <dei:EntityRegistrantName contextRef="AsOf2026-06-11" id="Fact000013">Greenland Energy Company</dei:EntityRegistrantName>
    <ffd:PrevslyPdFlg contextRef="From2026-06-112026-06-11_1" id="Fact000014">false</ffd:PrevslyPdFlg>
    <ffd:OfferingSctyTp contextRef="From2026-06-112026-06-11_1" id="Fact000015">Equity</ffd:OfferingSctyTp>
    <ffd:OfferingSctyTitl contextRef="From2026-06-112026-06-11_1" id="Fact000016">Common     stock, par value $0.0001 per share</ffd:OfferingSctyTitl>
    <ffd:FeesOthrRuleFlg contextRef="From2026-06-112026-06-11_1" id="Fact000017">true</ffd:FeesOthrRuleFlg>
    <ffd:AmtSctiesRegd
      contextRef="From2026-06-112026-06-11_1"
      decimals="INF"
      id="Fact000018"
      unitRef="Shares">3367237</ffd:AmtSctiesRegd>
    <ffd:MaxOfferingPricPerScty
      contextRef="From2026-06-112026-06-11_1"
      decimals="INF"
      id="Fact000019"
      unitRef="USDPShares">2.79</ffd:MaxOfferingPricPerScty>
    <ffd:MaxAggtOfferingPric
      contextRef="From2026-06-112026-06-11_1"
      decimals="2"
      id="Fact000020"
      unitRef="USD">9394591.23</ffd:MaxAggtOfferingPric>
    <ffd:FeeRate
      contextRef="From2026-06-112026-06-11_1"
      decimals="INF"
      id="Fact000021"
      unitRef="Ratio">0.00013810</ffd:FeeRate>
    <ffd:FeeAmt
      contextRef="From2026-06-112026-06-11_1"
      decimals="2"
      id="Fact000022"
      unitRef="USD">1297.40</ffd:FeeAmt>
    <ffd:TtlOfferingAmt
      contextRef="AsOf2026-06-11"
      decimals="2"
      id="Fact000023"
      unitRef="USD">9394591.23</ffd:TtlOfferingAmt>
    <ffd:TtlFeeAmt
      contextRef="AsOf2026-06-11"
      decimals="2"
      id="Fact000024"
      unitRef="USD">1297.40</ffd:TtlFeeAmt>
    <ffd:NetFeeAmt
      contextRef="AsOf2026-06-11"
      decimals="2"
      id="Fact000026"
      unitRef="USD">1297.40</ffd:NetFeeAmt>
    <ffd:OfferingNote contextRef="From2026-06-112026-06-11_1" id="Fact000028">&lt;p id="xdx_800_effd--OfferingNote_hffd--OfferingAxis__1_zZFX5GU0mIm9" style="font: 10pt Times New Roman, Times, Serif; margin: 0"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;&#160;&lt;/span&gt;&lt;/p&gt;









&lt;table cellpadding="0" cellspacing="0" style="font: 10pt Times New Roman, Times, Serif; border-collapse: collapse; width: 100%"&gt;
  &lt;tr style="font: 10pt Times New Roman, Times, Serif; vertical-align: top"&gt;
    &lt;td style="font: 10pt Times New Roman, Times, Serif; width: 0.25in; text-align: justify"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;(1)&lt;/span&gt;&lt;/td&gt;
    &lt;td style="font: 10pt Times New Roman, Times, Serif; text-align: justify"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;Pursuant
    to Rule&#160;416(a) promulgated under the Securities Act of 1933, as amended (the &#x201c;Securities Act&#x201d;), this registration
    statement on Form S-8 (the &#x201c;Registration Statement&#x201d;) to which this exhibit relates shall also cover any additional shares
    of the common stock of Greenland Energy Company (the &#x201c;Company,&#x201d; and such shares, &#x201c;Company Common Stock&#x201d;)
    that become issuable by reason of any stock dividend, stock split, recapitalization or other similar transaction that results in
    an increase in the number of outstanding shares of Company Common Stock.&lt;/span&gt;&lt;/td&gt; &lt;/tr&gt;
  &lt;tr style="font: 10pt Times New Roman, Times, Serif; vertical-align: top"&gt;
    &lt;td style="font: 10pt Times New Roman, Times, Serif; text-align: justify"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;(2)&lt;/span&gt;&lt;/td&gt;
    &lt;td style="font: 10pt Times New Roman, Times, Serif; text-align: justify"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;Fee
    calculated in accordance with Rules&#160;457(c) and 457(h) under the Securities Act.&lt;/span&gt;&lt;/td&gt; &lt;/tr&gt;
  &lt;tr style="font: 10pt Times New Roman, Times, Serif; vertical-align: top"&gt;
    &lt;td style="font: 10pt Times New Roman, Times, Serif; text-align: justify"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;(3)&lt;/span&gt;&lt;/td&gt;
    &lt;td style="font: 10pt Times New Roman, Times, Serif; text-align: justify"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;Represents
    shares of Company Common Stock reserved for future issuance under the Greenland Energy Company 2026 Omnibus Incentive Plan.&lt;/span&gt;&lt;/td&gt; &lt;/tr&gt;
  &lt;tr style="font: 10pt Times New Roman, Times, Serif; vertical-align: top"&gt;
    &lt;td style="font: 10pt Times New Roman, Times, Serif; text-align: justify"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;(4)&lt;/span&gt;&lt;/td&gt;
    &lt;td style="font: 10pt Times New Roman, Times, Serif; text-align: justify"&gt;&lt;span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"&gt;Estimated
    solely for the purpose of calculating the registration fee required by Section&#160;6(b) of the Securities Act and calculated in
    accordance with Rules&#160;457(c) and 457(h) promulgated thereunder. The aggregate offering price is the average of the high and
    low sales prices of shares of Company Common Stock on the Nasdaq Global Market on June 10, 2026.&lt;/span&gt;&lt;/td&gt; &lt;/tr&gt;
  &lt;/table&gt;

</ffd:OfferingNote>
</xbrl>
