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<xbrl
  xml:lang="en-US"
  xmlns="http://www.xbrl.org/2003/instance"
  xmlns:dei="http://xbrl.sec.gov/dei/2026"
  xmlns:ffd="http://xbrl.sec.gov/ffd/2026"
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      xlink:href="https://xbrl.sec.gov/ffd/2026/ffd-2026.xsd"
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        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0001521945</identifier>
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                <xbrldi:typedMember dimension="ffd:OfferingAxis">
                    <dei:lineNo>1</dei:lineNo>
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        <period>
            <startDate>2026-06-26</startDate>
            <endDate>2026-06-26</endDate>
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    <context id="c-2">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0001521945</identifier>
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        <period>
            <startDate>2026-06-26</startDate>
            <endDate>2026-06-26</endDate>
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    <unit id="usd">
        <measure>iso4217:USD</measure>
    </unit>
    <unit id="number">
        <measure>pure</measure>
    </unit>
    <dei:EntityCentralIndexKey contextRef="c-2" id="f-11">0001521945</dei:EntityCentralIndexKey>
    <dei:EntityRegistrantName contextRef="c-2" id="f-12">Prospect Floating Rate and Alternative Income Fund, Inc.</dei:EntityRegistrantName>
    <ffd:FormTp contextRef="c-2" id="f-13">SC TO</ffd:FormTp>
    <ffd:SubmissnTp contextRef="c-2" id="f-14">SC TO-I</ffd:SubmissnTp>
    <ffd:FeeExhibitTp contextRef="c-2" id="f-15">EX-FILING FEES</ffd:FeeExhibitTp>
    <ffd:OffsetTableNa contextRef="c-2" id="f-16">N/A</ffd:OffsetTableNa>
    <ffd:PrevslyPdFlg contextRef="c-1" id="f-1">false</ffd:PrevslyPdFlg>
    <ffd:TxValtn contextRef="c-1" decimals="2" id="f-2" unitRef="usd">1160560</ffd:TxValtn>
    <ffd:FeeRate contextRef="c-1" decimals="7" id="f-3" unitRef="number">0.00013810</ffd:FeeRate>
    <ffd:FeeAmt contextRef="c-1" decimals="2" id="f-4" unitRef="usd">160.27</ffd:FeeAmt>
    <ffd:TtlTxValtn contextRef="c-2" decimals="2" id="f-5" unitRef="usd">1160560</ffd:TtlTxValtn>
    <ffd:TtlFeeAmt contextRef="c-2" decimals="2" id="f-6" unitRef="usd">160.27</ffd:TtlFeeAmt>
    <ffd:TtlPrevslyPdAmt contextRef="c-2" decimals="2" id="f-7" unitRef="usd">0</ffd:TtlPrevslyPdAmt>
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    <ffd:OfferingNote contextRef="c-1" id="f-10">&lt;div style="text-align:justify"&gt;&lt;span style="color:#000000;font-family:'Times New Roman',serif;font-size:10pt;font-weight:400;line-height:112%"&gt;(1) On June&#160;26, 2026, the Registrant offered to purchase up to the number of shares of its common stock that it can repurchase with the cash retained during the quarter ended March&#160;31, 2026, as a result of issuing shares through its distribution reinvestment plan to shareholders who elected to receive their distributions in the form of additional shares of common stock rather than in cash, at a price equal to the net asset value as of July&#160;31, 2026. The transaction valuation is estimated solely for purposes of calculating the filing fee and represents the total cost to Registrant of purchasing the estimated maximum number of shares pursuant to the offer utilizing the net asset value per share of Class A and Class I shares of $3.83 as of April&#160;30, 2026.&lt;/span&gt;&lt;/div&gt;&lt;div&gt;&lt;span style="color:#000000;font-family:'Times New Roman',serif;font-size:10pt;font-weight:400;line-height:112%"&gt;(2) &lt;/span&gt;&lt;span style="background-color:#ffffff;color:#000000;font-family:'Times New Roman',serif;font-size:10pt;font-weight:400;line-height:112%"&gt;Calculated at $138.10 per $1,000,000.00 of the Transaction Valuation in accordance with Rule 0-11 under the Securities Exchange Act of 1934, as amended, as modified by Fee Rate Advisory No. 1 for fiscal year 2026.&lt;/span&gt;&lt;/div&gt;</ffd:OfferingNote>
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