<?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"
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      xlink:href="https://xbrl.sec.gov/ffd/2025/ffd-2025.xsd"
      xlink:type="simple"/>
    <context id="c0">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0001987363</identifier>
        </entity>
        <period>
            <startDate>2026-06-09</startDate>
            <endDate>2026-06-09</endDate>
        </period>
    </context>
    <context id="c1">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0001987363</identifier>
            <segment>
                <xbrldi:typedMember dimension="ffd:OfferingAxis">
                    <dei:lineNo>1</dei:lineNo>
                </xbrldi:typedMember>
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        </entity>
        <period>
            <startDate>2026-06-09</startDate>
            <endDate>2026-06-09</endDate>
        </period>
    </context>
    <unit id="usd">
        <measure>iso4217:USD</measure>
    </unit>
    <ffd:FormTp contextRef="c0" id="ixv-16">F-1</ffd:FormTp>
    <dei:EntityRegistrantName contextRef="c0" id="ixv-25">Waton Financial Limited</dei:EntityRegistrantName>
    <ffd:PrevslyPdFlg contextRef="c1" id="ixv-70">true</ffd:PrevslyPdFlg>
    <ffd:OfferingSctyTp contextRef="c1" id="ixv-73">Equity</ffd:OfferingSctyTp>
    <ffd:OfferingSctyTitl contextRef="c1" id="ixv-154">Ordinary shares, no par value per share</ffd:OfferingSctyTitl>
    <ffd:Rule457oFlg contextRef="c1" id="ixv-79">true</ffd:Rule457oFlg>
    <ffd:MaxAggtOfferingPric contextRef="c1" decimals="INF" id="ixv-155" unitRef="usd">15757573.9</ffd:MaxAggtOfferingPric>
    <ffd:FeeAmt contextRef="c1" decimals="1" id="ixv-156" unitRef="usd">2176.2</ffd:FeeAmt>
    <ffd:TtlOfferingAmt contextRef="c0" decimals="INF" id="ixv-157" unitRef="usd">15757573.9</ffd:TtlOfferingAmt>
    <ffd:TtlFeeAmt contextRef="c0" decimals="1" id="ixv-158" unitRef="usd">2176.2</ffd:TtlFeeAmt>
    <ffd:TtlPrevslyPdAmt contextRef="c0" decimals="1" id="ixv-159" unitRef="usd">2176.2</ffd:TtlPrevslyPdAmt>
    <ffd:TtlOffsetAmt contextRef="c0" decimals="0" id="ixv-160" unitRef="usd">0</ffd:TtlOffsetAmt>
    <ffd:NetFeeAmt contextRef="c0" decimals="0" id="ixv-161" unitRef="usd">0</ffd:NetFeeAmt>
    <ffd:OfferingNote contextRef="c1" id="ixv-129">&lt;table style="font-size: 12pt; border-spacing: 0px; border-collapse: collapse; width: 100%;"&gt; &lt;tr style="height: 0px; font-size: 0px;"&gt;&lt;td style="width: 1%;"&gt;&#160;&lt;/td&gt;&lt;td style="width: 99%;"&gt;&#160;&lt;/td&gt;&lt;/tr&gt;&lt;tr style="vertical-align: top;"&gt; &lt;td style="padding: 0px 0pt; font-size: 10pt;"&gt; &lt;div style="margin-bottom: 4pt;"&gt; (1) &lt;/div&gt; &lt;/td&gt; &lt;td style="padding: 0px 5.4pt; text-align: left; font-size: 10pt;"&gt; &lt;div style="margin-bottom: 4pt;"&gt; Estimated solely for the purpose of determining the amount of registration fee in accordance with Rule 457(o) under the Securities Act of 1933, as amended (the &#x201c;Securities Act&#x201d;). &lt;/div&gt; &lt;/td&gt; &lt;/tr&gt; &lt;/table&gt;&lt;table style="font-size: 12pt; border-spacing: 0px; border-collapse: collapse; width: 100%;"&gt;
   &lt;tr style="height: 0px; font-size: 0px;"&gt;&lt;td style="width: 1%;"&gt;&#160;&lt;/td&gt;&lt;td style="width: 99%;"&gt;&#160;&lt;/td&gt;&lt;/tr&gt;&lt;tr style="vertical-align: top;"&gt;
    &lt;td style="padding: 0px 0pt; font-size: 10pt;"&gt;
     &lt;div style="margin-bottom: 4pt;"&gt;
      (2)
     &lt;/div&gt;
    &lt;/td&gt;
    &lt;td style="padding: 0px 5.4pt; text-align: left; font-size: 10pt;"&gt;
     &lt;div style="margin-bottom: 4pt;"&gt;
      In accordance with Rule 416, the Registrant is also registering an indeterminate number of additional ordinary shares that shall be issuable after the date hereof as a result of share splits, share dividends, or similar transactions.
     &lt;/div&gt;
    &lt;/td&gt;
   &lt;/tr&gt;
  &lt;/table&gt;</ffd:OfferingNote>
    <ffd:CombinedProspectusTableNa contextRef="c0" id="ixv-164">N/A</ffd:CombinedProspectusTableNa>
    <dei:EntityCentralIndexKey contextRef="c0" id="ixv-165">0001987363</dei:EntityCentralIndexKey>
    <ffd:FeeExhibitTp contextRef="c0" id="ixv-166">EX-FILING FEES</ffd:FeeExhibitTp>
    <ffd:OffsetTableNa contextRef="c0" id="ixv-167">N/A</ffd:OffsetTableNa>
    <ffd:RegnFileNb contextRef="c0" id="ixv-168">333-291557</ffd:RegnFileNb>
    <ffd:SubmissnTp contextRef="c0" id="ixv-169">POS AM</ffd:SubmissnTp>
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