<?xml version="1.0" encoding="utf-8"?>
<xbrl
  xmlns="http://www.xbrl.org/2003/instance"
  xmlns:dei="http://xbrl.sec.gov/dei/2024"
  xmlns:ffd="http://xbrl.sec.gov/ffd/2024q2"
  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/2024q2/ffd-2024q2.xsd"
      xlink:type="simple"/>
    <context id="P02_28_2025To02_28_2025">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0001508655</identifier>
        </entity>
        <period>
            <startDate>2025-02-28</startDate>
            <endDate>2025-02-28</endDate>
        </period>
    </context>
    <context id="P02_28_2025To02_28_2025_1TypedMemberffdOfferingAxis">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0001508655</identifier>
            <segment>
                <xbrldi:typedMember dimension="ffd:OfferingAxis">
                    <dei:lineNo>1</dei:lineNo>
                </xbrldi:typedMember>
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        </entity>
        <period>
            <startDate>2025-02-28</startDate>
            <endDate>2025-02-28</endDate>
        </period>
    </context>
    <unit id="Unit_USD">
        <measure>iso4217:USD</measure>
    </unit>
    <unit id="Unit_pure">
        <measure>pure</measure>
    </unit>
    <dei:EntityCentralIndexKey contextRef="P02_28_2025To02_28_2025" id="ixv-278">0001508655</dei:EntityCentralIndexKey>
    <ffd:RegnFileNb contextRef="P02_28_2025To02_28_2025" id="ixv-279">333-276252</ffd:RegnFileNb>
    <ffd:FormTp contextRef="P02_28_2025To02_28_2025" id="ixv-280">N-2</ffd:FormTp>
    <ffd:OfferingSctyTitl
      contextRef="P02_28_2025To02_28_2025_1TypedMemberffdOfferingAxis"
      id="hidden131778658">Common Stock, $0.01 par value per share</ffd:OfferingSctyTitl>
    <ffd:TtlPrevslyPdAmt
      contextRef="P02_28_2025To02_28_2025"
      decimals="0"
      id="ixv-282"
      unitRef="Unit_USD">0</ffd:TtlPrevslyPdAmt>
    <ffd:TtlOffsetAmt
      contextRef="P02_28_2025To02_28_2025"
      decimals="0"
      id="ixv-283"
      unitRef="Unit_USD">0</ffd:TtlOffsetAmt>
    <ffd:FeeExhibitTp contextRef="P02_28_2025To02_28_2025" id="ixv-284">EX-FILING FEES</ffd:FeeExhibitTp>
    <ffd:SubmissnTp contextRef="P02_28_2025To02_28_2025" id="ixv-307">424B2</ffd:SubmissnTp>
    <dei:EntityRegistrantName contextRef="P02_28_2025To02_28_2025" id="ixv-308">Sixth Street Specialty Lending, Inc.</dei:EntityRegistrantName>
    <ffd:PrevslyPdFlg
      contextRef="P02_28_2025To02_28_2025_1TypedMemberffdOfferingAxis"
      id="ixv-309">false</ffd:PrevslyPdFlg>
    <ffd:OfferingSctyTp
      contextRef="P02_28_2025To02_28_2025_1TypedMemberffdOfferingAxis"
      id="ixv-310">Equity</ffd:OfferingSctyTp>
    <ffd:Rule457oFlg
      contextRef="P02_28_2025To02_28_2025_1TypedMemberffdOfferingAxis"
      id="ixv-311">true</ffd:Rule457oFlg>
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      contextRef="P02_28_2025To02_28_2025_1TypedMemberffdOfferingAxis"
      decimals="0"
      id="ixv-312"
      unitRef="Unit_USD">100000000</ffd:MaxAggtOfferingPric>
    <ffd:FeeRate
      contextRef="P02_28_2025To02_28_2025_1TypedMemberffdOfferingAxis"
      decimals="INF"
      id="ixv-313"
      unitRef="Unit_pure">0.0001531</ffd:FeeRate>
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      contextRef="P02_28_2025To02_28_2025_1TypedMemberffdOfferingAxis"
      decimals="2"
      id="ixv-314"
      unitRef="Unit_USD">15310</ffd:FeeAmt>
    <ffd:TtlOfferingAmt
      contextRef="P02_28_2025To02_28_2025"
      decimals="0"
      id="ixv-315"
      unitRef="Unit_USD">100000000</ffd:TtlOfferingAmt>
    <ffd:TtlFeeAmt
      contextRef="P02_28_2025To02_28_2025"
      decimals="2"
      id="ixv-316"
      unitRef="Unit_USD">15310</ffd:TtlFeeAmt>
    <ffd:NetFeeAmt
      contextRef="P02_28_2025To02_28_2025"
      decimals="2"
      id="ixv-317"
      unitRef="Unit_USD">15310</ffd:NetFeeAmt>
    <ffd:OfferingNote
      contextRef="P02_28_2025To02_28_2025_1TypedMemberffdOfferingAxis"
      id="ixv-270">
&lt;table cellpadding="0" cellspacing="0" style="text-align:start; BORDER-COLLAPSE:COLLAPSE; font-family:Times New Roman; font-size:10pt;border:0;width:100%"&gt;
&lt;tr style="page-break-inside:avoid"&gt;
&lt;td style="width:4%;vertical-align:top;text-align:left"&gt;(1)&lt;/td&gt;
&lt;td style="vertical-align:top;text-align:left"&gt;&lt;div style="margin-top: 0pt; margin-bottom: 0pt; font-size: 10pt; font-family: &amp;quot;Times New Roman&amp;quot;; text-align: left; line-height: normal;"&gt;Calculated in accordance with Rule 457(o), based on the proposed maximum aggregate offering price, and Rule 457(r) 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;</ffd:OfferingNote>
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