<?xml version='1.0' encoding='utf-8'?>
<FilingSummary>
  <Version>3.24.2.u1</Version>
  <ProcessingTime/>
  <ReportFormat>html</ReportFormat>
  <ContextCount>328</ContextCount>
  <ElementCount>299</ElementCount>
  <EntityCount>1</EntityCount>
  <FootnotesReported>false</FootnotesReported>
  <SegmentCount>87</SegmentCount>
  <ScenarioCount>0</ScenarioCount>
  <TuplesReported>false</TuplesReported>
  <UnitCount>10</UnitCount>
  <MyReports>
    <Report instance="licy-20240630.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R1.htm</HtmlFileName>
      <LongName>0000001 - Document - Cover</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://li-cycle.com/role/Cover</Role>
      <ShortName>Cover</ShortName>
      <MenuCategory>Cover</MenuCategory>
      <Position>1</Position>
    </Report>
    <Report instance="licy-20240630.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R2.htm</HtmlFileName>
      <LongName>9952151 - Statement - Unaudited condensed consolidated interim statements of operations and comprehensive loss</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://li-cycle.com/role/Unauditedcondensedconsolidatedinterimstatementsofoperationsandcomprehensiveloss</Role>
      <ShortName>Unaudited condensed consolidated interim statements of operations and comprehensive loss</ShortName>
      <MenuCategory>Statements</MenuCategory>
      <Position>2</Position>
    </Report>
    <Report instance="licy-20240630.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R3.htm</HtmlFileName>
      <LongName>9952152 - Statement - Unaudited condensed consolidated interim balance sheets</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://li-cycle.com/role/Unauditedcondensedconsolidatedinterimbalancesheets</Role>
      <ShortName>Unaudited condensed consolidated interim balance sheets</ShortName>
      <MenuCategory>Statements</MenuCategory>
      <Position>3</Position>
    </Report>
    <Report instance="licy-20240630.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R4.htm</HtmlFileName>
      <LongName>9952153 - Statement - Unaudited condensed consolidated interim balance sheets (Parenthetical)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://li-cycle.com/role/UnauditedcondensedconsolidatedinterimbalancesheetsParenthetical</Role>
      <ShortName>Unaudited condensed consolidated interim balance sheets (Parenthetical)</ShortName>
      <MenuCategory>Statements</MenuCategory>
      <Position>4</Position>
    </Report>
    <Report instance="licy-20240630.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R5.htm</HtmlFileName>
      <LongName>9952154 - Statement - Unaudited condensed consolidated interim statements of equity</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://li-cycle.com/role/Unauditedcondensedconsolidatedinterimstatementsofequity</Role>
      <ShortName>Unaudited condensed consolidated interim statements of equity</ShortName>
      <MenuCategory>Statements</MenuCategory>
      <Position>5</Position>
    </Report>
    <Report instance="licy-20240630.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R6.htm</HtmlFileName>
      <LongName>9952155 - Statement - Unaudited condensed consolidated interim statements of cash flows</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://li-cycle.com/role/Unauditedcondensedconsolidatedinterimstatementsofcashflows</Role>
      <ShortName>Unaudited condensed consolidated interim statements of cash flows</ShortName>
      <MenuCategory>Statements</MenuCategory>
      <Position>6</Position>
    </Report>
    <Report instance="licy-20240630.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R7.htm</HtmlFileName>
      <LongName>9952156 - Disclosure - Basis of Presentation</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://li-cycle.com/role/BasisofPresentation</Role>
      <ShortName>Basis of Presentation</ShortName>
      <MenuCategory>Notes</MenuCategory>
      <Position>7</Position>
    </Report>
    <Report instance="licy-20240630.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R8.htm</HtmlFileName>
      <LongName>9952157 - Disclosure - Revenue - product sales and recycling services</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://li-cycle.com/role/Revenueproductsalesandrecyclingservices</Role>
      <ShortName>Revenue - product sales and recycling services</ShortName>
      <MenuCategory>Notes</MenuCategory>
      <Position>8</Position>
    </Report>
    <Report instance="licy-20240630.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R9.htm</HtmlFileName>
      <LongName>9952158 - Disclosure - Prepayments, deposits and other current assets</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://li-cycle.com/role/Prepaymentsdepositsandothercurrentassets</Role>
      <ShortName>Prepayments, deposits and other current assets</ShortName>
      <MenuCategory>Notes</MenuCategory>
      <Position>9</Position>
    </Report>
    <Report instance="licy-20240630.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R10.htm</HtmlFileName>
      <LongName>9952159 - Disclosure - Inventories, net</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://li-cycle.com/role/Inventoriesnet</Role>
      <ShortName>Inventories, net</ShortName>
      <MenuCategory>Notes</MenuCategory>
      <Position>10</Position>
    </Report>
    <Report instance="licy-20240630.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R11.htm</HtmlFileName>
      <LongName>9952160 - Disclosure - Property, plant and equipment, net</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://li-cycle.com/role/Propertyplantandequipmentnet</Role>
      <ShortName>Property, plant and equipment, net</ShortName>
      <MenuCategory>Notes</MenuCategory>
      <Position>11</Position>
    </Report>
    <Report instance="licy-20240630.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R12.htm</HtmlFileName>
      <LongName>9952161 - Disclosure - Leases</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://li-cycle.com/role/Leases</Role>
      <ShortName>Leases</ShortName>
      <MenuCategory>Notes</MenuCategory>
      <Position>12</Position>
    </Report>
    <Report instance="licy-20240630.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R13.htm</HtmlFileName>
      <LongName>9952162 - Disclosure - Other assets</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://li-cycle.com/role/Otherassets</Role>
      <ShortName>Other assets</ShortName>
      <MenuCategory>Notes</MenuCategory>
      <Position>13</Position>
    </Report>
    <Report instance="licy-20240630.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R14.htm</HtmlFileName>
      <LongName>9952163 - Disclosure - Related party transactions</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://li-cycle.com/role/Relatedpartytransactions</Role>
      <ShortName>Related party transactions</ShortName>
      <MenuCategory>Notes</MenuCategory>
      <Position>14</Position>
    </Report>
    <Report instance="licy-20240630.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R15.htm</HtmlFileName>
      <LongName>9952164 - Disclosure - Accounts payable and accrued liabilities</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://li-cycle.com/role/Accountspayableandaccruedliabilities</Role>
      <ShortName>Accounts payable and accrued liabilities</ShortName>
      <MenuCategory>Notes</MenuCategory>
      <Position>15</Position>
    </Report>
    <Report instance="licy-20240630.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R16.htm</HtmlFileName>
      <LongName>9952165 - Disclosure - Convertible debt</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://li-cycle.com/role/Convertibledebt</Role>
      <ShortName>Convertible debt</ShortName>
      <MenuCategory>Notes</MenuCategory>
      <Position>16</Position>
    </Report>
    <Report instance="licy-20240630.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R17.htm</HtmlFileName>
      <LongName>9952166 - Disclosure - Common stock and additional paid-in capital</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://li-cycle.com/role/Commonstockandadditionalpaidincapital</Role>
      <ShortName>Common stock and additional paid-in capital</ShortName>
      <MenuCategory>Notes</MenuCategory>
      <Position>17</Position>
    </Report>
    <Report instance="licy-20240630.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R18.htm</HtmlFileName>
      <LongName>9952167 - Disclosure - Financial assets and liabilities</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://li-cycle.com/role/Financialassetsandliabilities</Role>
      <ShortName>Financial assets and liabilities</ShortName>
      <MenuCategory>Notes</MenuCategory>
      <Position>18</Position>
    </Report>
    <Report instance="licy-20240630.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R19.htm</HtmlFileName>
      <LongName>9952168 - Disclosure - Commitments and contingencies</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://li-cycle.com/role/Commitmentsandcontingencies</Role>
      <ShortName>Commitments and contingencies</ShortName>
      <MenuCategory>Notes</MenuCategory>
      <Position>19</Position>
    </Report>
    <Report instance="licy-20240630.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R20.htm</HtmlFileName>
      <LongName>9952169 - Disclosure - Loss per share</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://li-cycle.com/role/Losspershare</Role>
      <ShortName>Loss per share</ShortName>
      <MenuCategory>Notes</MenuCategory>
      <Position>20</Position>
    </Report>
    <Report instance="licy-20240630.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R21.htm</HtmlFileName>
      <LongName>9952170 - Disclosure - Segment reporting</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://li-cycle.com/role/Segmentreporting</Role>
      <ShortName>Segment reporting</ShortName>
      <MenuCategory>Notes</MenuCategory>
      <Position>21</Position>
    </Report>
    <Report instance="licy-20240630.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R22.htm</HtmlFileName>
      <LongName>9952171 - Disclosure - Subsequent events</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://li-cycle.com/role/Subsequentevents</Role>
      <ShortName>Subsequent events</ShortName>
      <MenuCategory>Notes</MenuCategory>
      <Position>22</Position>
    </Report>
    <Report instance="licy-20240630.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R23.htm</HtmlFileName>
      <LongName>9952172 - Disclosure - Accounting Changes</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://li-cycle.com/role/AccountingChanges</Role>
      <ShortName>Accounting Changes</ShortName>
      <MenuCategory>Notes</MenuCategory>
      <Position>23</Position>
    </Report>
    <Report instance="licy-20240630.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R24.htm</HtmlFileName>
      <LongName>995410 - Disclosure - Pay vs Performance Disclosure</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://xbrl.sec.gov/ecd/role/PvpDisclosure</Role>
      <ShortName>Pay vs Performance Disclosure</ShortName>
      <MenuCategory>Notes</MenuCategory>
      <Position>24</Position>
    </Report>
    <Report instance="licy-20240630.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R25.htm</HtmlFileName>
      <LongName>995445 - Disclosure - Insider Trading Arrangements</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://xbrl.sec.gov/ecd/role/InsiderTradingArrangements</Role>
      <ShortName>Insider Trading Arrangements</ShortName>
      <MenuCategory>Notes</MenuCategory>
      <Position>25</Position>
    </Report>
    <Report instance="licy-20240630.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R26.htm</HtmlFileName>
      <LongName>9954471 - Disclosure - Basis of Presentation (Policies)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://li-cycle.com/role/BasisofPresentationPolicies</Role>
      <ShortName>Basis of Presentation (Policies)</ShortName>
      <MenuCategory>Policies</MenuCategory>
      <ParentRole>http://li-cycle.com/role/AccountingChanges</ParentRole>
      <Position>26</Position>
    </Report>
    <Report instance="licy-20240630.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R27.htm</HtmlFileName>
      <LongName>9954472 - Disclosure - Revenue - product sales and recycling services (Tables)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://li-cycle.com/role/RevenueproductsalesandrecyclingservicesTables</Role>
      <ShortName>Revenue - product sales and recycling services (Tables)</ShortName>
      <MenuCategory>Tables</MenuCategory>
      <ParentRole>http://li-cycle.com/role/Revenueproductsalesandrecyclingservices</ParentRole>
      <Position>27</Position>
    </Report>
    <Report instance="licy-20240630.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R28.htm</HtmlFileName>
      <LongName>9954473 - Disclosure - Prepayments, deposits and other current assets (Tables)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://li-cycle.com/role/PrepaymentsdepositsandothercurrentassetsTables</Role>
      <ShortName>Prepayments, deposits and other current assets (Tables)</ShortName>
      <MenuCategory>Tables</MenuCategory>
      <ParentRole>http://li-cycle.com/role/Prepaymentsdepositsandothercurrentassets</ParentRole>
      <Position>28</Position>
    </Report>
    <Report instance="licy-20240630.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R29.htm</HtmlFileName>
      <LongName>9954474 - Disclosure - Inventories, net (Tables)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://li-cycle.com/role/InventoriesnetTables</Role>
      <ShortName>Inventories, net (Tables)</ShortName>
      <MenuCategory>Tables</MenuCategory>
      <ParentRole>http://li-cycle.com/role/Inventoriesnet</ParentRole>
      <Position>29</Position>
    </Report>
    <Report instance="licy-20240630.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R30.htm</HtmlFileName>
      <LongName>9954475 - Disclosure - Property, plant and equipment, net (Tables)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://li-cycle.com/role/PropertyplantandequipmentnetTables</Role>
      <ShortName>Property, plant and equipment, net (Tables)</ShortName>
      <MenuCategory>Tables</MenuCategory>
      <ParentRole>http://li-cycle.com/role/Propertyplantandequipmentnet</ParentRole>
      <Position>30</Position>
    </Report>
    <Report instance="licy-20240630.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R31.htm</HtmlFileName>
      <LongName>9954476 - Disclosure - Leases (Tables)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://li-cycle.com/role/LeasesTables</Role>
      <ShortName>Leases (Tables)</ShortName>
      <MenuCategory>Tables</MenuCategory>
      <ParentRole>http://li-cycle.com/role/Leases</ParentRole>
      <Position>31</Position>
    </Report>
    <Report instance="licy-20240630.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R32.htm</HtmlFileName>
      <LongName>9954477 - Disclosure - Other assets (Tables)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://li-cycle.com/role/OtherassetsTables</Role>
      <ShortName>Other assets (Tables)</ShortName>
      <MenuCategory>Tables</MenuCategory>
      <ParentRole>http://li-cycle.com/role/Otherassets</ParentRole>
      <Position>32</Position>
    </Report>
    <Report instance="licy-20240630.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R33.htm</HtmlFileName>
      <LongName>9954478 - Disclosure - Accounts payable and accrued liabilities (Tables)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://li-cycle.com/role/AccountspayableandaccruedliabilitiesTables</Role>
      <ShortName>Accounts payable and accrued liabilities (Tables)</ShortName>
      <MenuCategory>Tables</MenuCategory>
      <ParentRole>http://li-cycle.com/role/Accountspayableandaccruedliabilities</ParentRole>
      <Position>33</Position>
    </Report>
    <Report instance="licy-20240630.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R34.htm</HtmlFileName>
      <LongName>9954479 - Disclosure - Convertible debt (Tables)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://li-cycle.com/role/ConvertibledebtTables</Role>
      <ShortName>Convertible debt (Tables)</ShortName>
      <MenuCategory>Tables</MenuCategory>
      <ParentRole>http://li-cycle.com/role/Convertibledebt</ParentRole>
      <Position>34</Position>
    </Report>
    <Report instance="licy-20240630.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R35.htm</HtmlFileName>
      <LongName>9954480 - Disclosure - Common stock and additional paid-in capital (Tables)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://li-cycle.com/role/CommonstockandadditionalpaidincapitalTables</Role>
      <ShortName>Common stock and additional paid-in capital (Tables)</ShortName>
      <MenuCategory>Tables</MenuCategory>
      <ParentRole>http://li-cycle.com/role/Commonstockandadditionalpaidincapital</ParentRole>
      <Position>35</Position>
    </Report>
    <Report instance="licy-20240630.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R36.htm</HtmlFileName>
      <LongName>9954481 - Disclosure - Financial assets and liabilities (Tables)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://li-cycle.com/role/FinancialassetsandliabilitiesTables</Role>
      <ShortName>Financial assets and liabilities (Tables)</ShortName>
      <MenuCategory>Tables</MenuCategory>
      <ParentRole>http://li-cycle.com/role/Financialassetsandliabilities</ParentRole>
      <Position>36</Position>
    </Report>
    <Report instance="licy-20240630.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R37.htm</HtmlFileName>
      <LongName>9954482 - Disclosure - Commitment and contingencies (Tables)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://li-cycle.com/role/CommitmentandcontingenciesTables</Role>
      <ShortName>Commitment and contingencies (Tables)</ShortName>
      <MenuCategory>Tables</MenuCategory>
      <Position>37</Position>
    </Report>
    <Report instance="licy-20240630.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R38.htm</HtmlFileName>
      <LongName>9954483 - Disclosure - Loss per share (Tables)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://li-cycle.com/role/LosspershareTables</Role>
      <ShortName>Loss per share (Tables)</ShortName>
      <MenuCategory>Tables</MenuCategory>
      <ParentRole>http://li-cycle.com/role/Losspershare</ParentRole>
      <Position>38</Position>
    </Report>
    <Report instance="licy-20240630.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R39.htm</HtmlFileName>
      <LongName>9954484 - Disclosure - Segment reporting (Tables)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://li-cycle.com/role/SegmentreportingTables</Role>
      <ShortName>Segment reporting (Tables)</ShortName>
      <MenuCategory>Tables</MenuCategory>
      <ParentRole>http://li-cycle.com/role/Segmentreporting</ParentRole>
      <Position>39</Position>
    </Report>
    <Report instance="licy-20240630.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R40.htm</HtmlFileName>
      <LongName>9954485 - Disclosure - Basis of Presentation - Narrative (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://li-cycle.com/role/BasisofPresentationNarrativeDetails</Role>
      <ShortName>Basis of Presentation - Narrative (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>40</Position>
    </Report>
    <Report instance="licy-20240630.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R41.htm</HtmlFileName>
      <LongName>9954486 - Disclosure - Revenue - product sales and recycling services - Schedule of Revenue (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://li-cycle.com/role/RevenueproductsalesandrecyclingservicesScheduleofRevenueDetails</Role>
      <ShortName>Revenue - product sales and recycling services - Schedule of Revenue (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>41</Position>
    </Report>
    <Report instance="licy-20240630.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R42.htm</HtmlFileName>
      <LongName>9954487 - Disclosure - Revenue - product sales and recycling services - Narrative (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://li-cycle.com/role/RevenueproductsalesandrecyclingservicesNarrativeDetails</Role>
      <ShortName>Revenue - product sales and recycling services - Narrative (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>42</Position>
    </Report>
    <Report instance="licy-20240630.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R43.htm</HtmlFileName>
      <LongName>9954488 - Disclosure - Revenue - product sales and recycling services - Movement In Deferred Revenue (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://li-cycle.com/role/RevenueproductsalesandrecyclingservicesMovementInDeferredRevenueDetails</Role>
      <ShortName>Revenue - product sales and recycling services - Movement In Deferred Revenue (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>43</Position>
    </Report>
    <Report instance="licy-20240630.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R44.htm</HtmlFileName>
      <LongName>9954489 - Disclosure - Prepayments, deposits and other current assets - Schedule of Prepaids (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://li-cycle.com/role/PrepaymentsdepositsandothercurrentassetsScheduleofPrepaidsDetails</Role>
      <ShortName>Prepayments, deposits and other current assets - Schedule of Prepaids (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>44</Position>
    </Report>
    <Report instance="licy-20240630.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R45.htm</HtmlFileName>
      <LongName>9954490 - Disclosure - Inventories, net - Schedule of Inventories (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://li-cycle.com/role/InventoriesnetScheduleofInventoriesDetails</Role>
      <ShortName>Inventories, net - Schedule of Inventories (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>45</Position>
    </Report>
    <Report instance="licy-20240630.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R46.htm</HtmlFileName>
      <LongName>9954491 - Disclosure - Inventories, net - Narrative (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://li-cycle.com/role/InventoriesnetNarrativeDetails</Role>
      <ShortName>Inventories, net - Narrative (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>46</Position>
    </Report>
    <Report instance="licy-20240630.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R47.htm</HtmlFileName>
      <LongName>9954492 - Disclosure - Property, plant and equipment, net - Schedule of Property and Equipment (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://li-cycle.com/role/PropertyplantandequipmentnetScheduleofPropertyandEquipmentDetails</Role>
      <ShortName>Property, plant and equipment, net - Schedule of Property and Equipment (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>47</Position>
    </Report>
    <Report instance="licy-20240630.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R48.htm</HtmlFileName>
      <LongName>9954493 - Disclosure - Property, plant and equipment, net - Narrative (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://li-cycle.com/role/PropertyplantandequipmentnetNarrativeDetails</Role>
      <ShortName>Property, plant and equipment, net - Narrative (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>48</Position>
    </Report>
    <Report instance="licy-20240630.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R49.htm</HtmlFileName>
      <LongName>9954494 - Disclosure - Leases - Schedule of Lease Costs (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://li-cycle.com/role/LeasesScheduleofLeaseCostsDetails</Role>
      <ShortName>Leases - Schedule of Lease Costs (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>49</Position>
    </Report>
    <Report instance="licy-20240630.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R50.htm</HtmlFileName>
      <LongName>9954495 - Disclosure - Leases - Narrative (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://li-cycle.com/role/LeasesNarrativeDetails</Role>
      <ShortName>Leases - Narrative (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>50</Position>
    </Report>
    <Report instance="licy-20240630.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R51.htm</HtmlFileName>
      <LongName>9954496 - Disclosure - Leases - Schedule of Supplemental Cash Flow (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://li-cycle.com/role/LeasesScheduleofSupplementalCashFlowDetails</Role>
      <ShortName>Leases - Schedule of Supplemental Cash Flow (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>51</Position>
    </Report>
    <Report instance="licy-20240630.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R52.htm</HtmlFileName>
      <LongName>9954497 - Disclosure - Leases - Schedule of Lease Maturity (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://li-cycle.com/role/LeasesScheduleofLeaseMaturityDetails</Role>
      <ShortName>Leases - Schedule of Lease Maturity (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>52</Position>
    </Report>
    <Report instance="licy-20240630.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R53.htm</HtmlFileName>
      <LongName>9954498 - Disclosure - Other assets - Schedule of Other Assets (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://li-cycle.com/role/OtherassetsScheduleofOtherAssetsDetails</Role>
      <ShortName>Other assets - Schedule of Other Assets (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>53</Position>
    </Report>
    <Report instance="licy-20240630.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R54.htm</HtmlFileName>
      <LongName>9954499 - Disclosure - Other assets - Schedule of Intangible Assets (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://li-cycle.com/role/OtherassetsScheduleofIntangibleAssetsDetails</Role>
      <ShortName>Other assets - Schedule of Intangible Assets (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>54</Position>
    </Report>
    <Report instance="licy-20240630.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R55.htm</HtmlFileName>
      <LongName>9954500 - Disclosure - Other assets - Narrative (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://li-cycle.com/role/OtherassetsNarrativeDetails</Role>
      <ShortName>Other assets - Narrative (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>55</Position>
    </Report>
    <Report instance="licy-20240630.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R56.htm</HtmlFileName>
      <LongName>9954501 - Disclosure - Related party transactions - Narrative (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://li-cycle.com/role/RelatedpartytransactionsNarrativeDetails</Role>
      <ShortName>Related party transactions - Narrative (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>56</Position>
    </Report>
    <Report instance="licy-20240630.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R57.htm</HtmlFileName>
      <LongName>9954502 - Disclosure - Accounts payable and accrued liabilities - Schedule of accounts payable and accrued liabilities (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://li-cycle.com/role/AccountspayableandaccruedliabilitiesScheduleofaccountspayableandaccruedliabilitiesDetails</Role>
      <ShortName>Accounts payable and accrued liabilities - Schedule of accounts payable and accrued liabilities (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>57</Position>
    </Report>
    <Report instance="licy-20240630.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R58.htm</HtmlFileName>
      <LongName>9954503 - Disclosure - Accounts payable and accrued liabilities - Narrative (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://li-cycle.com/role/AccountspayableandaccruedliabilitiesNarrativeDetails</Role>
      <ShortName>Accounts payable and accrued liabilities - Narrative (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>58</Position>
    </Report>
    <Report instance="licy-20240630.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R59.htm</HtmlFileName>
      <LongName>9954504 - Disclosure - Convertible debt - Schedule of Total Convertible Debt (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://li-cycle.com/role/ConvertibledebtScheduleofTotalConvertibleDebtDetails</Role>
      <ShortName>Convertible debt - Schedule of Total Convertible Debt (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>59</Position>
    </Report>
    <Report instance="licy-20240630.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R60.htm</HtmlFileName>
      <LongName>9954505 - Disclosure - Convertible debt - Schedule of Convertible Debt Maturities (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://li-cycle.com/role/ConvertibledebtScheduleofConvertibleDebtMaturitiesDetails</Role>
      <ShortName>Convertible debt - Schedule of Convertible Debt Maturities (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>60</Position>
    </Report>
    <Report instance="licy-20240630.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R61.htm</HtmlFileName>
      <LongName>9954506 - Disclosure - Convertible debt - Schedule Of KSP and Glencore Debt Activity (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://li-cycle.com/role/ConvertibledebtScheduleOfKSPandGlencoreDebtActivityDetails</Role>
      <ShortName>Convertible debt - Schedule Of KSP and Glencore Debt Activity (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>61</Position>
    </Report>
    <Report instance="licy-20240630.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R62.htm</HtmlFileName>
      <LongName>9954507 - Disclosure - Convertible debt - Narrative (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://li-cycle.com/role/ConvertibledebtNarrativeDetails</Role>
      <ShortName>Convertible debt - Narrative (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>62</Position>
    </Report>
    <Report instance="licy-20240630.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R63.htm</HtmlFileName>
      <LongName>9954508 - Disclosure - Convertible debt - Schedule of KSP PIK Notes (Details)</LongName>
      <ReportType>Notes</ReportType>
      <Role>http://li-cycle.com/role/ConvertibledebtScheduleofKSPPIKNotesDetails</Role>
      <ShortName>Convertible debt - Schedule of KSP PIK Notes (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>63</Position>
    </Report>
    <Report instance="licy-20240630.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R64.htm</HtmlFileName>
      <LongName>9954509 - Disclosure - Convertible debt - Schedule of KSP Convertible Notes Valuation Assumptions (Details)</LongName>
      <ReportType>Notes</ReportType>
      <Role>http://li-cycle.com/role/ConvertibledebtScheduleofKSPConvertibleNotesValuationAssumptionsDetails</Role>
      <ShortName>Convertible debt - Schedule of KSP Convertible Notes Valuation Assumptions (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>64</Position>
    </Report>
    <Report instance="licy-20240630.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R65.htm</HtmlFileName>
      <LongName>9954510 - Disclosure - Convertible debt - Schedule of Glencore PIK Notes (Details)</LongName>
      <ReportType>Notes</ReportType>
      <Role>http://li-cycle.com/role/ConvertibledebtScheduleofGlencorePIKNotesDetails</Role>
      <ShortName>Convertible debt - Schedule of Glencore PIK Notes (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>65</Position>
    </Report>
    <Report instance="licy-20240630.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R66.htm</HtmlFileName>
      <LongName>9954511 - Disclosure - Convertible debt - Schedule of Glencore Convertible Notes Valuation Assumptions (Details)</LongName>
      <ReportType>Notes</ReportType>
      <Role>http://li-cycle.com/role/ConvertibledebtScheduleofGlencoreConvertibleNotesValuationAssumptionsDetails</Role>
      <ShortName>Convertible debt - Schedule of Glencore Convertible Notes Valuation Assumptions (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>66</Position>
    </Report>
    <Report instance="licy-20240630.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R67.htm</HtmlFileName>
      <LongName>9954512 - Disclosure - Common stock and additional paid-in capital - Schedule of Stockholders' Equity (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://li-cycle.com/role/CommonstockandadditionalpaidincapitalScheduleofStockholdersEquityDetails</Role>
      <ShortName>Common stock and additional paid-in capital - Schedule of Stockholders' Equity (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>67</Position>
    </Report>
    <Report instance="licy-20240630.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R68.htm</HtmlFileName>
      <LongName>9954513 - Disclosure - Common stock and additional paid-in capital - Narrative (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://li-cycle.com/role/CommonstockandadditionalpaidincapitalNarrativeDetails</Role>
      <ShortName>Common stock and additional paid-in capital - Narrative (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>68</Position>
    </Report>
    <Report instance="licy-20240630.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R69.htm</HtmlFileName>
      <LongName>9954514 - Disclosure - Financial assets and liabilities - Assets and Liabilities Fair Value (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://li-cycle.com/role/FinancialassetsandliabilitiesAssetsandLiabilitiesFairValueDetails</Role>
      <ShortName>Financial assets and liabilities - Assets and Liabilities Fair Value (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>69</Position>
    </Report>
    <Report instance="licy-20240630.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R70.htm</HtmlFileName>
      <LongName>9954515 - Disclosure - Commitments and contingencies - Narrative (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://li-cycle.com/role/CommitmentsandcontingenciesNarrativeDetails</Role>
      <ShortName>Commitments and contingencies - Narrative (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>70</Position>
    </Report>
    <Report instance="licy-20240630.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R71.htm</HtmlFileName>
      <LongName>9954516 - Disclosure - Commitments and contingencies - Schedule of Contractual Obligations (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://li-cycle.com/role/CommitmentsandcontingenciesScheduleofContractualObligationsDetails</Role>
      <ShortName>Commitments and contingencies - Schedule of Contractual Obligations (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>71</Position>
    </Report>
    <Report instance="licy-20240630.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R72.htm</HtmlFileName>
      <LongName>9954517 - Disclosure - Loss per share - Schedule of EPS (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://li-cycle.com/role/LosspershareScheduleofEPSDetails</Role>
      <ShortName>Loss per share - Schedule of EPS (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>72</Position>
    </Report>
    <Report instance="licy-20240630.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R73.htm</HtmlFileName>
      <LongName>9954518 - Disclosure - Loss per share - Schedule of Antidilutive Shares (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://li-cycle.com/role/LosspershareScheduleofAntidilutiveSharesDetails</Role>
      <ShortName>Loss per share - Schedule of Antidilutive Shares (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>73</Position>
    </Report>
    <Report instance="licy-20240630.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R74.htm</HtmlFileName>
      <LongName>9954519 - Disclosure - Segment reporting - Schedule of Revenue by Major Customers (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://li-cycle.com/role/SegmentreportingScheduleofRevenuebyMajorCustomersDetails</Role>
      <ShortName>Segment reporting - Schedule of Revenue by Major Customers (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>74</Position>
    </Report>
    <Report instance="licy-20240630.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R75.htm</HtmlFileName>
      <LongName>9954520 - Disclosure - Segment reporting - Schedule of Geographical Information (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://li-cycle.com/role/SegmentreportingScheduleofGeographicalInformationDetails</Role>
      <ShortName>Segment reporting - Schedule of Geographical Information (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>75</Position>
    </Report>
    <Report>
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <LongName>All Reports</LongName>
      <ReportType>Book</ReportType>
      <ShortName>All Reports</ShortName>
    </Report>
  </MyReports>
  <InputFiles>
    <File doctype="10-Q" isDefinitelyFs="true" isUsgaap="true" original="licy-20240630.htm">licy-20240630.htm</File>
    <File>licy-20240630.xsd</File>
    <File>licy-20240630_cal.xml</File>
    <File>licy-20240630_def.xml</File>
    <File>licy-20240630_lab.xml</File>
    <File>licy-20240630_pre.xml</File>
  </InputFiles>
  <SupplementalFiles/>
  <BaseTaxonomies>
    <BaseTaxonomy items="1">http://fasb.org/srt/2024</BaseTaxonomy>
    <BaseTaxonomy items="837">http://fasb.org/us-gaap/2024</BaseTaxonomy>
    <BaseTaxonomy items="30">http://xbrl.sec.gov/dei/2024</BaseTaxonomy>
    <BaseTaxonomy items="4">http://xbrl.sec.gov/ecd/2024</BaseTaxonomy>
  </BaseTaxonomies>
  <HasPresentationLinkbase>true</HasPresentationLinkbase>
  <HasCalculationLinkbase>true</HasCalculationLinkbase>
</FilingSummary>
