<?xml version="1.0" encoding="utf-8"?>
<xbrl
  xmlns="http://www.xbrl.org/2003/instance"
  xmlns:dei="http://xbrl.sec.gov/dei/2026"
  xmlns:fnd="http://xbrl.sec.gov/fnd/2026"
  xmlns:link="http://www.xbrl.org/2003/linkbase"
  xmlns:xlink="http://www.w3.org/1999/xlink">
    <link:schemaRef xlink:href="ft13092-20260724.xsd" xlink:type="simple"/>
    <context id="AsOf2026-07-24">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0002132619</identifier>
        </entity>
        <period>
            <startDate>2026-07-24</startDate>
            <endDate>2026-07-24</endDate>
        </period>
    </context>
    <dei:AmendmentFlag contextRef="AsOf2026-07-24" id="Fact000003">false</dei:AmendmentFlag>
    <dei:EntityCentralIndexKey contextRef="AsOf2026-07-24" id="Fact000004">0002132619</dei:EntityCentralIndexKey>
    <dei:DocumentType contextRef="AsOf2026-07-24" id="Fact000010">S-6</dei:DocumentType>
    <dei:EntityRegistrantName contextRef="AsOf2026-07-24" id="Fact000011">FT 13092</dei:EntityRegistrantName>
    <dei:DocumentPeriodEndDate contextRef="AsOf2026-07-24" id="Fact000012">2026-07-24</dei:DocumentPeriodEndDate>
    <fnd:NmRule35d1TermDfnTextBlock contextRef="AsOf2026-07-24" id="Fact000014">

&lt;p style="font: bold 11pt/12pt Times New Roman, Times, Serif; margin: 4pt 0 1pt"&gt;Objective.&lt;/p&gt;

&lt;p style="font: 10pt/11pt Times New Roman, Times, Serif; margin: 0 0 2pt; text-indent: 0.25in"&gt;&lt;span style="letter-spacing: -0.05pt"&gt;The
Trust seeks above-average capital appreciation.&lt;/span&gt;&lt;/p&gt;

</fnd:NmRule35d1TermDfnTextBlock>
    <fnd:NmRule35d1TermSlctnCritTextBlock contextRef="AsOf2026-07-24" id="Fact000015">

&lt;p style="font: bold 10pt/11pt Times New Roman, Times, Serif; margin: 3pt 0 0"&gt;Portfolio Selection Process.&lt;/p&gt;

&lt;p style="font: 10pt/11pt Times New Roman, Times, Serif; margin: 0; text-indent: 0.25in"&gt;&lt;span style="letter-spacing: -0.05pt"&gt;The Trust
invests in a diversified portfolio of common stocks of companies that exhibit financial strength from five distinct segments of the market.
The five market segments are weighted based on the following allocations as of the date the portfolio was selected:&lt;/span&gt;&lt;/p&gt;

&lt;table cellpadding="0" cellspacing="0" style="font-family: Times New Roman, Times, Serif; border-collapse: collapse; width: 100%"&gt;
  &lt;tr&gt;
    &lt;td style="width: 80%; padding-top: 2pt; padding-bottom: 2pt; font-size: 2pt; font-weight: bold; line-height: 12pt"&gt;&lt;span style="font-size: 10pt; font-weight: normal"&gt;Capital Strength 	&lt;/span&gt;&lt;/td&gt;
    &lt;td style="width: 20%; padding-top: 2pt; padding-bottom: 2pt; font-size: 2pt; font-weight: bold; line-height: 11pt"&gt;&lt;span style="font-size: 10pt; font-weight: normal"&gt;&#160;30%&lt;/span&gt;&lt;/td&gt;&lt;/tr&gt;
  &lt;tr&gt;
    &lt;td style="padding-top: 2pt; padding-bottom: 2pt; font-size: 2pt; font-weight: bold; line-height: 12pt"&gt;&lt;span style="font-size: 10pt; font-weight: normal"&gt;Dividend Strength 	&lt;/span&gt;&lt;/td&gt;
    &lt;td style="padding-top: 2pt; padding-bottom: 2pt; font-size: 2pt; font-weight: bold; line-height: 11pt"&gt;&lt;span style="font-size: 10pt; font-weight: normal"&gt;&#160;20%&lt;/span&gt;&lt;/td&gt;&lt;/tr&gt;
  &lt;tr&gt;
    &lt;td style="padding-top: 2pt; padding-bottom: 2pt; font-size: 2pt; font-weight: bold; line-height: 12pt"&gt;&lt;span style="font-size: 10pt; font-weight: normal"&gt;SMid Capital Strength 	&lt;/span&gt;&lt;/td&gt;
    &lt;td style="padding-top: 2pt; padding-bottom: 2pt; font-size: 2pt; font-weight: bold; line-height: 11pt"&gt;&lt;span style="font-size: 10pt; font-weight: normal"&gt;&#160;20%&lt;/span&gt;&lt;/td&gt;&lt;/tr&gt;
  &lt;tr&gt;
    &lt;td style="padding-top: 2pt; padding-bottom: 2pt; font-size: 2pt; font-weight: bold; line-height: 12pt"&gt;&lt;span style="font-size: 10pt; font-weight: normal"&gt;International Capital Strength 	&lt;/span&gt;&lt;/td&gt;
    &lt;td style="padding-top: 2pt; padding-bottom: 2pt; font-size: 2pt; font-weight: bold; line-height: 11pt"&gt;&lt;span style="font-size: 10pt; font-weight: normal"&gt;&#160;20%&lt;/span&gt;&lt;/td&gt;&lt;/tr&gt;
  &lt;tr&gt;
    &lt;td style="padding-top: 2pt; padding-bottom: 2pt; font-size: 2pt; font-weight: bold; line-height: 12pt"&gt;&lt;span style="font-size: 10pt; font-weight: normal"&gt;Emerging Markets Strength 	&lt;/span&gt;&lt;/td&gt;
    &lt;td style="padding-top: 2pt; padding-bottom: 2pt; font-size: 2pt; font-weight: bold; line-height: 11pt"&gt;&lt;span style="font-size: 10pt; font-weight: normal"&gt;&#160;10%&lt;/span&gt;&lt;/td&gt;&lt;/tr&gt;
  &lt;/table&gt;
&lt;p style="font: bold 2pt/2pt Arial, Helvetica, Sans-Serif; margin: 0"&gt;&#160;&lt;/p&gt;

&lt;p style="font: 10pt/11pt Times New Roman, Times, Serif; margin: 0 0 2pt; text-indent: 0.25in"&gt;&lt;span style="letter-spacing: -0.05pt"&gt;Through
our selection process we seek to find the companies that we believe have the best prospects for above-average capital appreciation.&lt;/span&gt;&lt;/p&gt;

&lt;p style="font: 10pt/11pt Times New Roman, Times, Serif; margin: 0 0 2pt; text-indent: 0.25in"&gt;&lt;span style="letter-spacing: -0.05pt"&gt;&lt;i&gt;Identify
the universe.&lt;/i&gt; The first step in our selection process is to identify each universe from which we will select the stocks for the five
market segments. Each universe contains stocks selected specifically for each component of the allocation.&lt;/span&gt;&lt;/p&gt;

&lt;p style="font: 10pt/11pt Times New Roman, Times, Serif; margin: 0 0 2pt; text-indent: 0.25in"&gt;&lt;span style="letter-spacing: -0.05pt"&gt;&lt;i&gt;Screen
for financial strength.&lt;/i&gt; The next step in our process is to evaluate companies based on multiple factors. These factors are designed
to identify those stocks which exhibit strong fundamental characteristics and to eliminate those that do not meet our investment criteria.&lt;/span&gt;&lt;/p&gt;

&lt;p style="font: 10pt/11pt Times New Roman, Times, Serif; margin: 0 0 2pt; text-indent: 0.25in"&gt;&lt;span style="letter-spacing: -0.05pt"&gt;&lt;i&gt;Examine
historical financial results.&lt;/i&gt; The next step in our process is to look for those companies that have earned a net cash flow return
on investment that is above the average of their peers. &lt;/span&gt;&lt;/p&gt;

&lt;p style="font: 10pt/11pt Times New Roman, Times, Serif; margin: 0 0 2pt; text-indent: 0.25in"&gt;&lt;span style="letter-spacing: -0.05pt"&gt;&lt;i&gt;Select
companies with attractive valuations.&lt;/i&gt; The final step in our process is to select companies based on the fundamental analysis of our
team of research analysts. The stocks selected for the portfolio are those that meet our investment objective, trade at attractive valuations,
and in our opinion, are likely to exceed market expectations of future cash flows.&lt;/span&gt;&lt;/p&gt;

&lt;p style="font: 10pt/11pt Times New Roman, Times, Serif; margin: 0; text-indent: 0.25in"&gt;While not a part of the Trust&#x2019;s portfolio
selection process, the Trust also invests in depositary receipts, VIEs and large capitalization companies.&lt;/p&gt;

&lt;p style="font: 10pt/11pt Times New Roman, Times, Serif; margin: 0 0 2pt; text-indent: 0.25in"&gt;&lt;span style="letter-spacing: -0.05pt"&gt;As
with any similar investments, there can be no assurance that the objective of the Trust will be achieved. See &#x201c;Risk Factors&#x201d;
for a discussion of the risks of investing in the Trust.&lt;/span&gt;&lt;/p&gt;

</fnd:NmRule35d1TermSlctnCritTextBlock>
</xbrl>
