<?xml version="1.0" encoding="utf-8"?>
<xbrl
  xmlns="http://www.xbrl.org/2003/instance"
  xmlns:dei="http://xbrl.sec.gov/dei/2025"
  xmlns:ffd="http://xbrl.sec.gov/ffd/2025"
  xmlns:iso4217="http://www.xbrl.org/2003/iso4217"
  xmlns:link="http://www.xbrl.org/2003/linkbase"
  xmlns:xbrldi="http://xbrl.org/2006/xbrldi"
  xmlns:xlink="http://www.w3.org/1999/xlink"
  xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance">
    <link:schemaRef
      xlink:href="https://xbrl.sec.gov/ffd/2025/ffd-2025.xsd"
      xlink:type="simple"/>
    <context id="c_offering_1">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0001825248</identifier>
            <segment>
                <xbrldi:typedMember dimension="ffd:OfferingAxis">
                    <dei:lineNo>1</dei:lineNo>
                </xbrldi:typedMember>
            </segment>
        </entity>
        <period>
            <startDate>2026-02-25</startDate>
            <endDate>2026-02-25</endDate>
        </period>
    </context>
    <context id="c_report">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0001825248</identifier>
        </entity>
        <period>
            <startDate>2026-02-25</startDate>
            <endDate>2026-02-25</endDate>
        </period>
    </context>
    <unit id="USD">
        <measure>iso4217:USD</measure>
    </unit>
    <unit id="pure">
        <measure>pure</measure>
    </unit>
    <ffd:SubmissnTp contextRef="c_report" id="fee_001">SC TO-I</ffd:SubmissnTp>
    <ffd:FeeExhibitTp contextRef="c_report" id="fee_002">EX-FILING FEES</ffd:FeeExhibitTp>
    <dei:EntityCentralIndexKey contextRef="c_report" id="fee_003">0001825248</dei:EntityCentralIndexKey>
    <ffd:Rule011Flg contextRef="c_offering_1" id="fee_004">true</ffd:Rule011Flg>
    <ffd:OfferingTableNa contextRef="c_report" id="fee_005" xsi:nil="true"/>
    <ffd:OffsetTableNa contextRef="c_report" id="fee_006">N/A</ffd:OffsetTableNa>
    <ffd:FormTp contextRef="c_report" id="fee_007">SC TO</ffd:FormTp>
    <dei:EntityRegistrantName contextRef="c_report" id="fee_008">Franklin BSP Capital Corporation</dei:EntityRegistrantName>
    <ffd:PrevslyPdFlg contextRef="c_offering_1" id="fee_009">false</ffd:PrevslyPdFlg>
    <ffd:TxValtn
      contextRef="c_offering_1"
      decimals="INF"
      id="fee_010"
      unitRef="USD">34175000.00</ffd:TxValtn>
    <ffd:FeeRate
      contextRef="c_offering_1"
      decimals="INF"
      id="fee_011"
      unitRef="pure">0.0001381</ffd:FeeRate>
    <ffd:FeeAmt
      contextRef="c_offering_1"
      decimals="INF"
      id="fee_012"
      unitRef="USD">4719.57</ffd:FeeAmt>
    <ffd:TtlTxValtn
      contextRef="c_report"
      decimals="INF"
      id="fee_013"
      unitRef="USD">34175000.00</ffd:TtlTxValtn>
    <ffd:TtlFeeAmt
      contextRef="c_report"
      decimals="INF"
      id="fee_014"
      unitRef="USD">4719.57</ffd:TtlFeeAmt>
    <ffd:NetFeeAmt
      contextRef="c_report"
      decimals="INF"
      id="fee_015"
      unitRef="USD">4719.57</ffd:NetFeeAmt>
    <ffd:OfferingNote contextRef="c_offering_1" id="fee_016">On March 2, 2026, the Registrant offered to purchase up to 2,500,000 shares of its common stock at a price per share equal to the net asset value per share as of December 31, 2025. The transaction valuation is estimated solely for purposes of calculating the filing fee and represents the total cost to the Registrant of purchasing the estimated maximum number of shares pursuant to the offer utilizing the net asset value per share of $13.67 as of September 30, 2025.&lt;br/&gt;&lt;br/&gt;Calculated at $138.10 per $1,000,000.00 of the Transaction Valuation pursuant to Rule 0-11 under the Securities Exchange Act of 1934, as amended.</ffd:OfferingNote>
</xbrl>
