<?xml version="1.0" encoding="utf-8"?>
<xbrl
  xmlns="http://www.xbrl.org/2003/instance"
  xmlns:dei="http://xbrl.sec.gov/dei/2025"
  xmlns:link="http://www.xbrl.org/2003/linkbase"
  xmlns:naut="http://naut/20260401"
  xmlns:oef="http://xbrl.sec.gov/oef/2025"
  xmlns:xbrldi="http://xbrl.org/2006/xbrldi"
  xmlns:xlink="http://www.w3.org/1999/xlink">
    <link:schemaRef xlink:href="naut-20260401.xsd" xlink:type="simple"/>
    <context id="AsOf2026-04-01">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0001414040</identifier>
        </entity>
        <period>
            <startDate>2026-04-01</startDate>
            <endDate>2026-04-01</endDate>
        </period>
    </context>
    <context id="From2026-04-012026-04-01_custom_S000101442Member">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0001414040</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">naut:S000101442Member</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2026-04-01</startDate>
            <endDate>2026-04-01</endDate>
        </period>
    </context>
    <dei:AmendmentFlag contextRef="AsOf2026-04-01" id="Fact000003">false</dei:AmendmentFlag>
    <dei:DocumentType contextRef="AsOf2026-04-01" id="Fact000004">497</dei:DocumentType>
    <dei:EntityRegistrantName contextRef="AsOf2026-04-01" id="Fact000005">ALPS ETF Trust</dei:EntityRegistrantName>
    <dei:EntityInvCompanyType contextRef="AsOf2026-04-01" id="Fact000006">N-1A</dei:EntityInvCompanyType>
    <dei:DocumentPeriodEndDate contextRef="AsOf2026-04-01" id="Fact000007">2026-04-01</dei:DocumentPeriodEndDate>
    <dei:EntityCentralIndexKey contextRef="AsOf2026-04-01" id="Fact000008">0001414040</dei:EntityCentralIndexKey>
    <oef:SupplementToProspectusTextBlock
      contextRef="From2026-04-012026-04-01_custom_S000101442Member"
      id="Fact000014">&lt;p id="xdx_A89_eoef--SupplementToProspectusTextBlock_z5YGWN8I0PM8" style="font: 11pt Times New Roman, Times, Serif; margin: 0; text-align: center"&gt;&lt;b&gt;ALPS NAUTILUS SMR, NUCLEAR &amp;amp; TECHNOLOGY ETF
(NYSE ARCA: SMRF)&lt;/b&gt;&lt;/p&gt;

&lt;p style="font: 11pt Times New Roman, Times, Serif; margin: 0; text-align: center"&gt;&lt;b&gt;(the &#x201c;Fund&#x201d;)&lt;/b&gt;&lt;/p&gt;

&lt;p style="font: 11pt Times New Roman, Times, Serif; margin: 0; text-align: center"&gt;&lt;b&gt;&#160;&lt;/b&gt;&lt;/p&gt;

&lt;p style="font: 11pt Times New Roman, Times, Serif; margin: 0; text-align: center"&gt;&lt;b&gt;SUPPLEMENT DATED APRIL 1, 2026&lt;/b&gt;&lt;/p&gt;

&lt;p style="font: 11pt Times New Roman, Times, Serif; margin: 0; text-align: center"&gt;&lt;b&gt;TO THE SUMMARY PROSPECTUS, PROSPECTUS AND STATEMENT OF&lt;/b&gt;&lt;/p&gt;

&lt;p style="font: 11pt Times New Roman, Times, Serif; margin: 0; text-align: center"&gt;&lt;b&gt;ADDITIONAL INFORMATION, EACH
DATED &lt;span id="xdx_901_eoef--ProspectusDate_c20260401__20260401_zXMZNR1t7Oo3"&gt;FEBRUARY 18, 2026&lt;/span&gt;, AS SUPPLEMENTED&lt;/b&gt;&lt;/p&gt;

&lt;p style="font: 11pt Times New Roman, Times, Serif; margin: 0; text-align: center"&gt;&lt;b&gt;&#160;&lt;/b&gt;&lt;/p&gt;

&lt;p style="font: 11pt Times New Roman, Times, Serif; margin: 0; text-align: justify"&gt;&#160;&lt;i&gt;Effective immediately, the first
sentence in the section entitled &#x201c;PRINCIPAL INVESTMENT STRATEGIES&#x201d; in the Fund&#x2019;s Summary Prospectus and Summary
Section of the Prospectus are hereby deleted in its entirety and replaced with the following:&lt;/i&gt;&lt;/p&gt;

</oef:SupplementToProspectusTextBlock>
    <oef:ProspectusDate contextRef="AsOf2026-04-01" id="Fact000015">2026-02-18</oef:ProspectusDate>
    <oef:StrategyNarrativeTextBlock
      contextRef="From2026-04-012026-04-01_custom_S000101442Member"
      id="Fact000016">&lt;p id="xdx_A80_eoef--StrategyNarrativeTextBlock_znEqzw93EzEa" style="font: 11pt Times New Roman, Times, Serif; margin: 0; text-align: justify"&gt;The Fund seeks to achieve its investment objective
by creating an actively managed portfolio consisting of equity securities comprised significantly of those included in the Fund&#x2019;s
benchmark index, the Nautilus SMR, Nuclear &amp;amp; Technology Index (the &#x201c;Benchmark&#x201d;). In seeking to achieve its investment
objective, the Fund may also sell (write) and buy options.&lt;/p&gt;

</oef:StrategyNarrativeTextBlock>
</xbrl>
