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        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0001781162</identifier>
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        <period>
            <startDate>2026-04-01</startDate>
            <endDate>2026-04-01</endDate>
        </period>
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            <identifier scheme="http://www.sec.gov/CIK">0001781162</identifier>
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        <period>
            <startDate>2026-04-01</startDate>
            <endDate>2026-04-01</endDate>
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    <unit id="shares">
        <measure>shares</measure>
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    <unit id="usdPershares">
        <divide>
            <unitNumerator>
                <measure>iso4217:USD</measure>
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                <measure>shares</measure>
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        <measure>iso4217:USD</measure>
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    <unit id="pure">
        <measure>pure</measure>
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    <ffd:SubmissnTp contextRef="c0" id="ixv-147">S-8</ffd:SubmissnTp>
    <ffd:FormTp contextRef="c0" id="ixv-148">S-8</ffd:FormTp>
    <dei:EntityRegistrantName contextRef="c0" id="ixv-26">Momentus Inc.</dei:EntityRegistrantName>
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    <ffd:OfferingNote contextRef="c1" id="ixv-113">&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; Pursuant to Rule 416(a) of the Securities Act of 1933, as amended (the &#x201c;Securities Act&#x201d;), this Registration Statement shall also cover any additional shares of the Registrant&#x2019;s Class A common stock, par value $0.00001 per share (&#x201c;Common Stock&#x201d;), that become issuable under the Registrant&#x2019;s 2022 Inducement Equity Plan (the &#x201c;2022 Inducement Plan&#x201d;) by reason of any stock dividend, stock split, recapitalization or other similar transaction effected without receipt of consideration that increases the number of outstanding shares of Common Stock. &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;
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     &lt;div style="margin-bottom: 4pt;"&gt;
      (2)
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    &lt;td style="padding: 0px 5.4pt; text-align: left; font-size: 10pt;"&gt;
     &lt;div style="margin-bottom: 4pt;"&gt;
      Consists of 50,000 shares of Common Stock that were added to the shares authorized for issuance under the 2022 Inducement Plan pursuant to its terms.
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   &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;
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     &lt;div style="margin-bottom: 4pt;"&gt;
      (3)
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     &lt;div style="margin-bottom: 4pt;"&gt;
      Estimated in accordance with Rule 457(c) and (h) of the Securities Act solely for the purpose of calculating the registration fee on the basis of $3.87 per share, which is the average of the high and low prices of Common Stock on March 23, 2026, as reported on the Nasdaq Capital Market.
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      decimals="INF"
      id="hidden-fact-0"
      unitRef="pure">0.00013810</ffd:FeeRate>
    <dei:EntityCentralIndexKey contextRef="c0" id="ixv-162">0001781162</dei:EntityCentralIndexKey>
    <ffd:FeeExhibitTp contextRef="c0" id="ixv-163">EX-FILING FEES</ffd:FeeExhibitTp>
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