<?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/2026q3"
  xmlns:link="http://www.xbrl.org/2003/linkbase"
  xmlns:xlink="http://www.w3.org/1999/xlink">
    <link:schemaRef xlink:href="ft13262-20260922.xsd" xlink:type="simple"/>
    <context id="AsOf2026-09-22">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0002146608</identifier>
        </entity>
        <period>
            <startDate>2026-09-22</startDate>
            <endDate>2026-09-22</endDate>
        </period>
    </context>
    <dei:AmendmentFlag contextRef="AsOf2026-09-22" id="Fact000003">false</dei:AmendmentFlag>
    <dei:EntityCentralIndexKey contextRef="AsOf2026-09-22" id="Fact000004">0002146608</dei:EntityCentralIndexKey>
    <dei:DocumentType contextRef="AsOf2026-09-22" id="Fact000010">S-6</dei:DocumentType>
    <dei:EntityRegistrantName contextRef="AsOf2026-09-22" id="Fact000011">FT 13262</dei:EntityRegistrantName>
    <dei:DocumentPeriodEndDate contextRef="AsOf2026-09-22" id="Fact000012">2026-09-22</dei:DocumentPeriodEndDate>
    <fnd:NmRule35d1TermDfnTextBlock contextRef="AsOf2026-09-22" id="Fact000013">

&lt;p style="font: bold 11pt/12pt Times New Roman, Times, Serif; margin: 4pt 0 1pt"&gt;Objectives.&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 income, with limited capital appreciation as a secondary objective. The Trust is concentrated (i.e., invests 25% or more of
Trust assets) in common stocks of companies within the information technology sector.&lt;/span&gt;&lt;/p&gt;

</fnd:NmRule35d1TermDfnTextBlock>
    <fnd:NmRule35d1TermSlctnCritTextBlock contextRef="AsOf2026-09-22" id="Fact000014">

&lt;p style="font: bold 11pt/12pt Times New Roman, Times, Serif; margin: 4pt 0 1pt"&gt;Portfolio Selection Process.&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 is a unit investment trust which invests in a fixed portfolio of common stocks of well-capitalized companies with strong market
positions, and simultaneously, the portfolio sells a LEAPS&lt;sup&gt;&#xae;&lt;/sup&gt; call option against each Common Stock (which is known as a
&#x201c;buy-write&#x201d; or &#x201c;covered call&#x201d; strategy). The writing (selling) of a call option generates income in the form of
a premium paid by the option buyer. The portfolio invests this income in U.S. Treasury notes and the interest received from the notes
is paid to Unit holders periodically.&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;Common
Stocks are selected for the portfolio based on the following criteria as of the date the portfolio was selected:&lt;/span&gt;&lt;/p&gt;

&lt;table cellpadding="0" cellspacing="0" style="font: 10pt/11pt Times New Roman, Times, Serif; width: 100%; margin-top: 0; margin-bottom: 2pt"&gt;&lt;tr style="vertical-align: top"&gt;
&lt;td style="width: 0"&gt;&lt;/td&gt;&lt;td style="width: 10pt"&gt;&lt;span style="letter-spacing: -0.05pt"&gt;&#x2022;&lt;/span&gt;&lt;/td&gt;&lt;td&gt;&lt;span style="letter-spacing: -0.05pt"&gt;Member of the S&amp;amp;P 500&lt;sup&gt;&#xae;&lt;/sup&gt; Index;&lt;/span&gt;&lt;/td&gt;&lt;/tr&gt;&lt;/table&gt;

&lt;table cellpadding="0" cellspacing="0" style="font: 10pt/11pt Times New Roman, Times, Serif; width: 100%; margin-top: 0; margin-bottom: 2pt"&gt;&lt;tr style="vertical-align: top"&gt;
&lt;td style="width: 0"&gt;&lt;/td&gt;&lt;td style="width: 10pt"&gt;&lt;span style="letter-spacing: -0.05pt"&gt;&#x2022;&lt;/span&gt;&lt;/td&gt;&lt;td&gt;&lt;span style="letter-spacing: -0.05pt"&gt;Cash position greater than $1 billion;&lt;/span&gt;&lt;/td&gt;&lt;/tr&gt;&lt;/table&gt;

&lt;table cellpadding="0" cellspacing="0" style="font: 10pt/11pt Times New Roman, Times, Serif; width: 100%; margin-top: 0; margin-bottom: 2pt"&gt;&lt;tr style="vertical-align: top"&gt;
&lt;td style="width: 0"&gt;&lt;/td&gt;&lt;td style="width: 10pt"&gt;&lt;span style="letter-spacing: -0.05pt"&gt;&#x2022;&lt;/span&gt;&lt;/td&gt;&lt;td&gt;&lt;span style="letter-spacing: -0.05pt"&gt;Long-term debt to market value ratio less than 30%;&lt;/span&gt;&lt;/td&gt;&lt;/tr&gt;&lt;/table&gt;

&lt;table cellpadding="0" cellspacing="0" style="font: 10pt/11pt Times New Roman, Times, Serif; width: 100%; margin-top: 0; margin-bottom: 2pt"&gt;&lt;tr style="vertical-align: top"&gt;
&lt;td style="width: 0"&gt;&lt;/td&gt;&lt;td style="width: 10pt"&gt;&lt;span style="letter-spacing: -0.05pt"&gt;&#x2022;&lt;/span&gt;&lt;/td&gt;&lt;td&gt;&lt;span style="letter-spacing: -0.05pt"&gt;Return on equity greater than 15%;&lt;/span&gt;&lt;/td&gt;&lt;/tr&gt;&lt;/table&gt;

&lt;table cellpadding="0" cellspacing="0" style="font: 10pt/11pt Times New Roman, Times, Serif; width: 100%; margin-top: 0; margin-bottom: 2pt"&gt;&lt;tr style="vertical-align: top"&gt;
&lt;td style="width: 0"&gt;&lt;/td&gt;&lt;td style="width: 10pt"&gt;&lt;span style="letter-spacing: -0.05pt"&gt;&#x2022;&lt;/span&gt;&lt;/td&gt;&lt;td&gt;&lt;span style="letter-spacing: -0.05pt"&gt;LEAPS&lt;sup&gt;&#xae;&lt;/sup&gt; availability; and&lt;/span&gt;&lt;/td&gt;&lt;/tr&gt;&lt;/table&gt;

&lt;table cellpadding="0" cellspacing="0" style="font: 10pt/11pt Times New Roman, Times, Serif; width: 100%; margin-top: 0; margin-bottom: 2pt"&gt;&lt;tr style="vertical-align: top"&gt;
&lt;td style="width: 0"&gt;&lt;/td&gt;&lt;td style="width: 10pt"&gt;&lt;span style="letter-spacing: -0.05pt"&gt;&#x2022;&lt;/span&gt;&lt;/td&gt;&lt;td&gt;&lt;span style="letter-spacing: -0.05pt"&gt;Cash flow analysis and the judgment of the analyst.&lt;/span&gt;&lt;/td&gt;&lt;/tr&gt;&lt;/table&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;Each
Common Stock is subject to a contractual right, in the form of LEAPS&lt;sup&gt;&#xae;&lt;/sup&gt;, which gives the holder of the
LEAPS&lt;sup&gt;&#xae;&lt;/sup&gt; (the &#x201c;Right Holder&#x201d;) the right to buy the Common Stock at a predetermined price (the
&#x201c;Strike Price&#x201d;) on any business day prior to the expiration of the LEAPS&lt;sup&gt;&#xae;&lt;/sup&gt;. Each LEAPS&lt;sup&gt;&#xae;&lt;/sup&gt;
will be issued by The Options Clearing Corporation (&#x201c;OCC&#x201d;) in the form of an American style option, which means that it
is exercisable at the Strike Price on any business day prior to its expiration date. The expiration date for each of the
LEAPS&lt;sup&gt;&#xae;&lt;/sup&gt; included in the Trust is January 21, 2028.&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;The
Treasury Obligations included in the Trust are non-callable debt obligations that are issued by and backed by the full faith and credit
of the U.S. Government. &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;In
calculating the net asset value of a Unit, the price of a Unit is reduced by the value of the LEAPS&lt;sup&gt;&#xae;&lt;/sup&gt;.&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;As
of the close of business on the business day preceding the Initial Date of Deposit, the capital appreciation on the Common Stocks held
by the Trust is limited to a maximum of approximately 22.31%, because of the obligation of the Trust to the Right Holder with respect to
each of the Common Stocks entitling the Right Holder to purchase the Common Stocks at the Strike Price. The LEAPS&lt;sup&gt;&#xae;&lt;/sup&gt; limit
the Trust&#x2019;s upside potential in the Common Stocks to an amount equal to the Strike Price. However, as the option premium received
in return for issuing the LEAPS&lt;sup&gt;&#xae;&lt;/sup&gt; was used to purchase Treasury Obligations, the Trust will receive interest from the Treasury
Obligations until they mature and the principal from the Treasury Obligations shortly after they mature.&lt;/span&gt;&lt;/p&gt;

</fnd:NmRule35d1TermSlctnCritTextBlock>
</xbrl>
