<?xml version="1.0" encoding="utf-8"?>
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  xml:lang="en-US"
  xmlns="http://www.xbrl.org/2003/instance"
  xmlns:bill="http://bill.com/20260820"
  xmlns:dei="http://xbrl.sec.gov/dei/2025"
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        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0001786352</identifier>
        </entity>
        <period>
            <startDate>2026-08-20</startDate>
            <endDate>2026-08-20</endDate>
        </period>
    </context>
    <context id="c-2">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0001786352</identifier>
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            <startDate>2026-08-20</startDate>
            <endDate>2026-08-20</endDate>
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        <period>
            <startDate>2026-08-20</startDate>
            <endDate>2026-08-20</endDate>
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        <measure>bill:shares</measure>
    </unit>
    <unit id="pure">
        <measure>bill:pURE</measure>
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    <unit id="usd">
        <measure>iso4217:USD</measure>
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    <unit id="number">
        <measure>pure</measure>
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    <ffd:PrevslyPdFlg contextRef="c-3" id="f-28">false</ffd:PrevslyPdFlg>
    <ffd:PrevslyPdFlg contextRef="c-2" id="f-29">false</ffd:PrevslyPdFlg>
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    <ffd:TtlOffsetAmt contextRef="c-1" decimals="0" id="f-22" unitRef="usd">0</ffd:TtlOffsetAmt>
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    <ffd:OfferingNote contextRef="c-2" id="f-25">&lt;div style="padding-left:34.5pt;padding-right:12.5pt"&gt;&lt;span style="color:#000000;font-family:'Times New Roman',serif;font-size:9pt;font-weight:400;line-height:120%"&gt;(1) Represents additional shares of the Registrant&#x2019;s common stock reserved for issuance under the 2019 Equity Incentive Plan (&#x201c;2019 Plan&#x201d;) resulting from the automatic annual increase in the number of authorized shares reserved and available for issuance under the 2019 Plan.&lt;/span&gt;&lt;/div&gt;&lt;div style="margin-top:12pt;padding-left:34.5pt;padding-right:12.5pt"&gt;&lt;span style="color:#000000;font-family:'Times New Roman',serif;font-size:9pt;font-weight:400;line-height:120%"&gt;(2) Estimated pursuant to Rules 457(c) and (h)&#160;of the Securities Act, solely for the purpose of calculating the registration fee, on the basis of the average of the high and low prices of the Registrant&#x2019;s common stock as reported on the New York Stock Exchange ("NYSE") on August&#160;13, 2026.&lt;/span&gt;&lt;/div&gt;</ffd:OfferingNote>
    <ffd:OfferingNote contextRef="c-3" id="f-24">&lt;div style="padding-left:34.5pt;padding-right:12.5pt"&gt;&lt;span style="color:#000000;font-family:'Times New Roman',serif;font-size:9pt;font-weight:400;line-height:120%"&gt;(1) Represents additional shares of the Registrant&#x2019;s common stock reserved for issuance under the 2019 Equity Incentive Plan (&#x201c;2019 Plan&#x201d;) resulting from the automatic annual increase in the number of authorized shares reserved and available for issuance under the 2019 Plan.&lt;/span&gt;&lt;/div&gt;&lt;div style="margin-top:12pt;padding-left:34.5pt;padding-right:12.5pt"&gt;&lt;span style="color:#000000;font-family:'Times New Roman',serif;font-size:9pt;font-weight:400;line-height:120%"&gt;(2) Estimated pursuant to Rules 457(c) and (h)&#160;of the Securities Act, solely for the purpose of calculating the registration fee, on the basis of the average of the high and low prices of the Registrant&#x2019;s common stock as reported on the New York Stock Exchange ("NYSE") on August&#160;13, 2026.&lt;/span&gt;&lt;/div&gt;</ffd:OfferingNote>
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