<?xml version="1.0" encoding="utf-8"?>
<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"
  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/2026/ffd-2026.xsd"
      xlink:type="simple"/>
    <context id="c-1">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0001476840</identifier>
            <segment>
                <xbrldi:typedMember dimension="ffd:OfferingAxis">
                    <dei:lineNo>1</dei:lineNo>
                </xbrldi:typedMember>
            </segment>
        </entity>
        <period>
            <startDate>2026-05-13</startDate>
            <endDate>2026-05-13</endDate>
        </period>
    </context>
    <context id="c-2">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0001476840</identifier>
        </entity>
        <period>
            <startDate>2026-05-13</startDate>
            <endDate>2026-05-13</endDate>
        </period>
    </context>
    <unit id="usd">
        <measure>iso4217:USD</measure>
    </unit>
    <unit id="number">
        <measure>pure</measure>
    </unit>
    <dei:EntityCentralIndexKey contextRef="c-2" id="f-11">0001476840</dei:EntityCentralIndexKey>
    <ffd:OffsetTableNa contextRef="c-2" id="f-12">N/A</ffd:OffsetTableNa>
    <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>
    <dei:EntityRegistrantName contextRef="c-2" id="f-16">Expensify, Inc.</dei:EntityRegistrantName>
    <ffd:OfferingTableNa contextRef="c-2" id="f-17" xsi:nil="true"/>
    <ffd:Rule011Flg contextRef="c-1" id="f-18">true</ffd:Rule011Flg>
    <ffd:PrevslyPdFlg contextRef="c-1" id="f-1">false</ffd:PrevslyPdFlg>
    <ffd:TxValtn contextRef="c-1" decimals="2" id="f-2" unitRef="usd">25000000</ffd:TxValtn>
    <ffd:FeeRate contextRef="c-1" decimals="7" id="f-3" unitRef="number">0.0001381</ffd:FeeRate>
    <ffd:FeeAmt contextRef="c-1" decimals="2" id="f-4" unitRef="usd">3452.5</ffd:FeeAmt>
    <ffd:TtlTxValtn contextRef="c-2" decimals="2" id="f-5" unitRef="usd">25000000</ffd:TtlTxValtn>
    <ffd:TtlFeeAmt contextRef="c-2" decimals="2" id="f-6" unitRef="usd">3452.5</ffd:TtlFeeAmt>
    <ffd:TtlPrevslyPdAmt contextRef="c-2" decimals="2" id="f-7" unitRef="usd">0</ffd:TtlPrevslyPdAmt>
    <ffd:TtlOffsetAmt contextRef="c-2" decimals="2" id="f-8" unitRef="usd">0</ffd:TtlOffsetAmt>
    <ffd:NetFeeAmt contextRef="c-2" decimals="2" id="f-9" unitRef="usd">3452.5</ffd:NetFeeAmt>
    <ffd:OfferingNote contextRef="c-1" id="f-10">&lt;span style="color:#000000;font-family:'Times New Roman',serif;font-size:8pt;font-weight:400;line-height:139%;padding-left:12pt"&gt;Calculated solely for purposes of determining the amount of the filing fee. This amount is based on the Registrant's offer to purchase up to &lt;/span&gt;&lt;span style="color:#000000;font-family:'Times New Roman',serif;font-size:7pt;font-weight:400;line-height:139%"&gt;$25,000,000.00&lt;/span&gt; in value of shares of Class A common stock, par value $0.0001 per share. Calculated at $138.10 per $1,000,000.00 of the transaction valuation in accordance with Rule 0-11(b) of the Securities Exchange Act of 1934, as amended, as modified by Filing Fee Rate Advisory for Fiscal Year 2026, issued August 25, 2025. The transaction valuation set forth above was calculated for the sole purpose of determining the filing fee and should not be used for any other purpose.</ffd:OfferingNote>
</xbrl>
