<?xml version='1.0' encoding='utf-8'?>
<FilingSummary>
  <Version>3.25.0.1</Version>
  <ProcessingTime/>
  <ReportFormat>html</ReportFormat>
  <ContextCount>462</ContextCount>
  <ElementCount>569</ElementCount>
  <EntityCount>1</EntityCount>
  <FootnotesReported>true</FootnotesReported>
  <SegmentCount>138</SegmentCount>
  <ScenarioCount>0</ScenarioCount>
  <TuplesReported>false</TuplesReported>
  <UnitCount>8</UnitCount>
  <MyReports>
    <Report instance="nvx-20241231.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R1.htm</HtmlFileName>
      <LongName>100000 - Document - Document and Entity Information</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.novon.com/20241231/taxonomy/role/Role_DocumentDocumentAndEntityInformation</Role>
      <ShortName>Document and Entity Information</ShortName>
      <MenuCategory>Cover</MenuCategory>
      <Position>1</Position>
    </Report>
    <Report instance="nvx-20241231.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R2.htm</HtmlFileName>
      <LongName>100010 - Statement - Consolidated statement of profit or loss and other comprehensive income</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.novon.com/20241231/taxonomy/role/StatementConsolidatedStatementOfProfitOrLossAndOtherComprehensiveIncome</Role>
      <ShortName>Consolidated statement of profit or loss and other comprehensive income</ShortName>
      <MenuCategory>Statements</MenuCategory>
      <Position>2</Position>
    </Report>
    <Report instance="nvx-20241231.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R3.htm</HtmlFileName>
      <LongName>100040 - Statement - Consolidated Balance Sheets</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.novon.com/20241231/taxonomy/role/StatementConsolidatedBalanceSheets</Role>
      <ShortName>Consolidated Balance Sheets</ShortName>
      <MenuCategory>Statements</MenuCategory>
      <Position>3</Position>
    </Report>
    <Report instance="nvx-20241231.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R4.htm</HtmlFileName>
      <LongName>100050 - Statement - Consolidated Statements of Changes in Equity</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.novon.com/20241231/taxonomy/role/StatementConsolidatedStatementsOfChangesInEquity</Role>
      <ShortName>Consolidated Statements of Changes in Equity</ShortName>
      <MenuCategory>Statements</MenuCategory>
      <Position>4</Position>
    </Report>
    <Report instance="nvx-20241231.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R5.htm</HtmlFileName>
      <LongName>100060 - Statement - Consolidated Statement of Cash Flows</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.novon.com/20241231/taxonomy/role/StatementConsolidatedStatementOfCashFlows</Role>
      <ShortName>Consolidated Statement of Cash Flows</ShortName>
      <MenuCategory>Statements</MenuCategory>
      <Position>5</Position>
    </Report>
    <Report instance="nvx-20241231.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R6.htm</HtmlFileName>
      <LongName>995447 - Disclosure - Insider Trading Policies and Procedures</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://xbrl.sec.gov/ecd/role/InsiderTradingPoliciesProc</Role>
      <ShortName>Insider Trading Policies and Procedures</ShortName>
      <MenuCategory>Notes</MenuCategory>
      <Position>6</Position>
    </Report>
    <Report instance="nvx-20241231.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R7.htm</HtmlFileName>
      <LongName>995457 - Disclosure - Cybersecurity Risk Management, Strategy and Governance</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.novon.com/20241231/taxonomy/role/DisclosureCybersecurityRiskManagementStrategyAndGovernance</Role>
      <ShortName>Cybersecurity Risk Management, Strategy and Governance</ShortName>
      <MenuCategory>Notes</MenuCategory>
      <Position>7</Position>
    </Report>
    <Report instance="nvx-20241231.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R8.htm</HtmlFileName>
      <LongName>995467 - Disclosure - Summary of Material Accounting Policy Information</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.novon.com/20241231/taxonomy/role/DisclosureSummaryOfMaterialAccountingPolicyInformation</Role>
      <ShortName>Summary of Material Accounting Policy Information</ShortName>
      <MenuCategory>Notes</MenuCategory>
      <Position>8</Position>
    </Report>
    <Report instance="nvx-20241231.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R9.htm</HtmlFileName>
      <LongName>995477 - Disclosure - Parent Entity Financial Information</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.novon.com/20241231/taxonomy/role/Role_DisclosureParentEntityFinancialInformation</Role>
      <ShortName>Parent Entity Financial Information</ShortName>
      <MenuCategory>Notes</MenuCategory>
      <Position>9</Position>
    </Report>
    <Report instance="nvx-20241231.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R10.htm</HtmlFileName>
      <LongName>995487 - Disclosure - Revenue</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.novon.com/20241231/taxonomy/role/Role_DisclosureRevenue</Role>
      <ShortName>Revenue</ShortName>
      <MenuCategory>Notes</MenuCategory>
      <Position>10</Position>
    </Report>
    <Report instance="nvx-20241231.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R11.htm</HtmlFileName>
      <LongName>995497 - Disclosure - Other Income, Net</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.novon.com/20241231/taxonomy/role/DisclosureOtherIncomeNet</Role>
      <ShortName>Other Income, Net</ShortName>
      <MenuCategory>Notes</MenuCategory>
      <Position>11</Position>
    </Report>
    <Report instance="nvx-20241231.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R12.htm</HtmlFileName>
      <LongName>995507 - Disclosure - Loss before Income Taxes</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.novon.com/20241231/taxonomy/role/DisclosureLossBeforeIncomeTaxes</Role>
      <ShortName>Loss before Income Taxes</ShortName>
      <MenuCategory>Notes</MenuCategory>
      <Position>12</Position>
    </Report>
    <Report instance="nvx-20241231.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R13.htm</HtmlFileName>
      <LongName>995517 - Disclosure - Income Tax (Benefit) Expense</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.novon.com/20241231/taxonomy/role/DisclosureIncomeTaxBenefitExpense</Role>
      <ShortName>Income Tax (Benefit) Expense</ShortName>
      <MenuCategory>Notes</MenuCategory>
      <Position>13</Position>
    </Report>
    <Report instance="nvx-20241231.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R14.htm</HtmlFileName>
      <LongName>995527 - Disclosure - Key Management Personnel Compensation</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.novon.com/20241231/taxonomy/role/Role_DisclosureKeyManagementPersonnelCompensation</Role>
      <ShortName>Key Management Personnel Compensation</ShortName>
      <MenuCategory>Notes</MenuCategory>
      <Position>14</Position>
    </Report>
    <Report instance="nvx-20241231.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R15.htm</HtmlFileName>
      <LongName>995537 - Disclosure - Auditor???s Remuneration</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.novon.com/20241231/taxonomy/role/Role_DisclosureAuditorSRemuneration</Role>
      <ShortName>Auditor???s Remuneration</ShortName>
      <MenuCategory>Notes</MenuCategory>
      <Position>15</Position>
    </Report>
    <Report instance="nvx-20241231.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R16.htm</HtmlFileName>
      <LongName>995547 - Disclosure - Earnings per Share</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.novon.com/20241231/taxonomy/role/DisclosureEarningsPerShare1</Role>
      <ShortName>Earnings per Share</ShortName>
      <MenuCategory>Notes</MenuCategory>
      <Position>16</Position>
    </Report>
    <Report instance="nvx-20241231.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R17.htm</HtmlFileName>
      <LongName>995577 - Disclosure - Trade and Other Receivables</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.novon.com/20241231/taxonomy/role/Role_DisclosureTradeAndOtherReceivables</Role>
      <ShortName>Trade and Other Receivables</ShortName>
      <MenuCategory>Notes</MenuCategory>
      <Position>17</Position>
    </Report>
    <Report instance="nvx-20241231.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R18.htm</HtmlFileName>
      <LongName>995587 - Disclosure - Prepayments</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.novon.com/20241231/taxonomy/role/Role_DisclosurePrepayments</Role>
      <ShortName>Prepayments</ShortName>
      <MenuCategory>Notes</MenuCategory>
      <Position>18</Position>
    </Report>
    <Report instance="nvx-20241231.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R19.htm</HtmlFileName>
      <LongName>995597 - Disclosure - Escrow Reserves</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.novon.com/20241231/taxonomy/role/DisclosureEscrowReserves1</Role>
      <ShortName>Escrow Reserves</ShortName>
      <MenuCategory>Notes</MenuCategory>
      <Position>19</Position>
    </Report>
    <Report instance="nvx-20241231.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R20.htm</HtmlFileName>
      <LongName>995607 - Disclosure - Inventory</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.novon.com/20241231/taxonomy/role/Role_DisclosureInventory</Role>
      <ShortName>Inventory</ShortName>
      <MenuCategory>Notes</MenuCategory>
      <Position>20</Position>
    </Report>
    <Report instance="nvx-20241231.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R21.htm</HtmlFileName>
      <LongName>995617 - Disclosure - Property, Plant and Equipment</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.novon.com/20241231/taxonomy/role/DisclosurePropertyPlantAndEquipment1</Role>
      <ShortName>Property, Plant and Equipment</ShortName>
      <MenuCategory>Notes</MenuCategory>
      <Position>21</Position>
    </Report>
    <Report instance="nvx-20241231.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R22.htm</HtmlFileName>
      <LongName>995627 - Disclosure - Financial Assets at Fair Value Through Profit or Loss</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.novon.com/20241231/taxonomy/role/DisclosureFinancialAssetsAtFairValueThroughProfitOrLoss1</Role>
      <ShortName>Financial Assets at Fair Value Through Profit or Loss</ShortName>
      <MenuCategory>Notes</MenuCategory>
      <Position>22</Position>
    </Report>
    <Report instance="nvx-20241231.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R23.htm</HtmlFileName>
      <LongName>995637 - Disclosure - Exploration and Evaluation Assets</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.novon.com/20241231/taxonomy/role/DisclosureExplorationAndEvaluationAssets1</Role>
      <ShortName>Exploration and Evaluation Assets</ShortName>
      <MenuCategory>Notes</MenuCategory>
      <Position>23</Position>
    </Report>
    <Report instance="nvx-20241231.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R24.htm</HtmlFileName>
      <LongName>995647 - Disclosure - Intangible Assets</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.novon.com/20241231/taxonomy/role/DisclosureIntangibleAssets1</Role>
      <ShortName>Intangible Assets</ShortName>
      <MenuCategory>Notes</MenuCategory>
      <Position>24</Position>
    </Report>
    <Report instance="nvx-20241231.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R25.htm</HtmlFileName>
      <LongName>995657 - Disclosure - Trade and Other Payables</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.novon.com/20241231/taxonomy/role/Role_DisclosureTradeAndOtherPayables</Role>
      <ShortName>Trade and Other Payables</ShortName>
      <MenuCategory>Notes</MenuCategory>
      <Position>25</Position>
    </Report>
    <Report instance="nvx-20241231.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R26.htm</HtmlFileName>
      <LongName>995667 - Disclosure - Contract Liabilities</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.novon.com/20241231/taxonomy/role/DisclosureContractLiabilities1</Role>
      <ShortName>Contract Liabilities</ShortName>
      <MenuCategory>Notes</MenuCategory>
      <Position>26</Position>
    </Report>
    <Report instance="nvx-20241231.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R27.htm</HtmlFileName>
      <LongName>995677 - Disclosure - Leases</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.novon.com/20241231/taxonomy/role/Role_DisclosureLeases</Role>
      <ShortName>Leases</ShortName>
      <MenuCategory>Notes</MenuCategory>
      <Position>27</Position>
    </Report>
    <Report instance="nvx-20241231.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R28.htm</HtmlFileName>
      <LongName>995687 - Disclosure - Borrowings</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.novon.com/20241231/taxonomy/role/Role_DisclosureBorrowings</Role>
      <ShortName>Borrowings</ShortName>
      <MenuCategory>Notes</MenuCategory>
      <Position>28</Position>
    </Report>
    <Report instance="nvx-20241231.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R29.htm</HtmlFileName>
      <LongName>995697 - Disclosure - Unsecured Convertible Loan Notes and Derivative Financial Instruments</LongName>
      <ReportType>Notes</ReportType>
      <Role>http://www.novon.com/20241231/taxonomy/role/DisclosureUnsecuredConvertibleLoanNotesAndDerivativeFinancialInstruments</Role>
      <ShortName>Unsecured Convertible Loan Notes and Derivative Financial Instruments</ShortName>
      <MenuCategory>Notes</MenuCategory>
      <Position>29</Position>
    </Report>
    <Report instance="nvx-20241231.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R30.htm</HtmlFileName>
      <LongName>995707 - Disclosure - Contributed Equity</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.novon.com/20241231/taxonomy/role/Role_DisclosureContributedEquity</Role>
      <ShortName>Contributed Equity</ShortName>
      <MenuCategory>Notes</MenuCategory>
      <Position>30</Position>
    </Report>
    <Report instance="nvx-20241231.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R31.htm</HtmlFileName>
      <LongName>995717 - Disclosure - Reserves</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.novon.com/20241231/taxonomy/role/Role_DisclosureReserves</Role>
      <ShortName>Reserves</ShortName>
      <MenuCategory>Notes</MenuCategory>
      <Position>31</Position>
    </Report>
    <Report instance="nvx-20241231.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R32.htm</HtmlFileName>
      <LongName>995727 - Disclosure - Operating Segments</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.novon.com/20241231/taxonomy/role/Role_DisclosureOperatingSegments</Role>
      <ShortName>Operating Segments</ShortName>
      <MenuCategory>Notes</MenuCategory>
      <Position>32</Position>
    </Report>
    <Report instance="nvx-20241231.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R33.htm</HtmlFileName>
      <LongName>995737 - Disclosure - Cash Flow Information</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.novon.com/20241231/taxonomy/role/Role_DisclosureCashFlowInformation</Role>
      <ShortName>Cash Flow Information</ShortName>
      <MenuCategory>Notes</MenuCategory>
      <Position>33</Position>
    </Report>
    <Report instance="nvx-20241231.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R34.htm</HtmlFileName>
      <LongName>995747 - Disclosure - Interests in Subsidiaries</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.novon.com/20241231/taxonomy/role/DisclosureInterestsInSubsidiaries1</Role>
      <ShortName>Interests in Subsidiaries</ShortName>
      <MenuCategory>Notes</MenuCategory>
      <Position>34</Position>
    </Report>
    <Report instance="nvx-20241231.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R35.htm</HtmlFileName>
      <LongName>995757 - Disclosure - Share-based Payments</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.novon.com/20241231/taxonomy/role/DisclosureSharebasedPayments3</Role>
      <ShortName>Share-based Payments</ShortName>
      <MenuCategory>Notes</MenuCategory>
      <Position>35</Position>
    </Report>
    <Report instance="nvx-20241231.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R36.htm</HtmlFileName>
      <LongName>995767 - Disclosure - Related Party Transactions</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.novon.com/20241231/taxonomy/role/Role_DisclosureRelatedPartyTransactions</Role>
      <ShortName>Related Party Transactions</ShortName>
      <MenuCategory>Notes</MenuCategory>
      <Position>36</Position>
    </Report>
    <Report instance="nvx-20241231.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R37.htm</HtmlFileName>
      <LongName>995777 - Disclosure - Commitments and Contingencies</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.novon.com/20241231/taxonomy/role/DisclosureCommitmentsAndContingencies1</Role>
      <ShortName>Commitments and Contingencies</ShortName>
      <MenuCategory>Notes</MenuCategory>
      <Position>37</Position>
    </Report>
    <Report instance="nvx-20241231.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R38.htm</HtmlFileName>
      <LongName>995787 - Disclosure - Financial Risk Management</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.novon.com/20241231/taxonomy/role/Role_DisclosureFinancialRiskManagement</Role>
      <ShortName>Financial Risk Management</ShortName>
      <MenuCategory>Notes</MenuCategory>
      <Position>38</Position>
    </Report>
    <Report instance="nvx-20241231.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R39.htm</HtmlFileName>
      <LongName>995797 - Disclosure - Events After the Reporting Date</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.novon.com/20241231/taxonomy/role/DisclosureEventsAfterTheReportingDate1</Role>
      <ShortName>Events After the Reporting Date</ShortName>
      <MenuCategory>Notes</MenuCategory>
      <Position>39</Position>
    </Report>
    <Report instance="nvx-20241231.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R40.htm</HtmlFileName>
      <LongName>995807 - Disclosure - Unaudited Half Year Report</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.novon.com/20241231/taxonomy/role/DisclosureUnauditedHalfYearReport</Role>
      <ShortName>Unaudited Half Year Report</ShortName>
      <MenuCategory>Notes</MenuCategory>
      <Position>40</Position>
    </Report>
    <Report instance="nvx-20241231.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R41.htm</HtmlFileName>
      <LongName>995817 - Disclosure - Summary of Material Accounting Policy Information (Policies)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.novon.com/20241231/taxonomy/role/DisclosureSummaryOfMaterialAccountingPolicyInformationPolicies</Role>
      <ShortName>Summary of Material Accounting Policy Information (Policies)</ShortName>
      <MenuCategory>Policies</MenuCategory>
      <ParentRole>http://www.novon.com/20241231/taxonomy/role/DisclosureSummaryOfMaterialAccountingPolicyInformation</ParentRole>
      <Position>41</Position>
    </Report>
    <Report instance="nvx-20241231.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R42.htm</HtmlFileName>
      <LongName>995827 - Disclosure - Summary of Material Accounting Policy Information (Tables)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.novon.com/20241231/taxonomy/role/DisclosureSummaryOfMaterialAccountingPolicyInformationTables</Role>
      <ShortName>Summary of Material Accounting Policy Information (Tables)</ShortName>
      <MenuCategory>Tables</MenuCategory>
      <ParentRole>http://www.novon.com/20241231/taxonomy/role/DisclosureSummaryOfMaterialAccountingPolicyInformation</ParentRole>
      <Position>42</Position>
    </Report>
    <Report instance="nvx-20241231.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R43.htm</HtmlFileName>
      <LongName>995837 - Disclosure - Parent Entity Financial Information (Tables)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.novon.com/20241231/taxonomy/role/Role_DisclosureParentEntityFinancialInformationTables</Role>
      <ShortName>Parent Entity Financial Information (Tables)</ShortName>
      <MenuCategory>Tables</MenuCategory>
      <ParentRole>http://www.novon.com/20241231/taxonomy/role/Role_DisclosureParentEntityFinancialInformation</ParentRole>
      <Position>43</Position>
    </Report>
    <Report instance="nvx-20241231.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R44.htm</HtmlFileName>
      <LongName>995847 - Disclosure - Revenue (Tables)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.novon.com/20241231/taxonomy/role/Role_DisclosureRevenueTables</Role>
      <ShortName>Revenue (Tables)</ShortName>
      <MenuCategory>Tables</MenuCategory>
      <ParentRole>http://www.novon.com/20241231/taxonomy/role/Role_DisclosureRevenue</ParentRole>
      <Position>44</Position>
    </Report>
    <Report instance="nvx-20241231.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R45.htm</HtmlFileName>
      <LongName>995857 - Disclosure - Other Income, Net (Tables)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.novon.com/20241231/taxonomy/role/DisclosureOtherIncomeNetTables</Role>
      <ShortName>Other Income, Net (Tables)</ShortName>
      <MenuCategory>Tables</MenuCategory>
      <ParentRole>http://www.novon.com/20241231/taxonomy/role/DisclosureOtherIncomeNet</ParentRole>
      <Position>45</Position>
    </Report>
    <Report instance="nvx-20241231.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R46.htm</HtmlFileName>
      <LongName>995867 - Disclosure - Loss before Income Taxes (Tables)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.novon.com/20241231/taxonomy/role/DisclosureLossBeforeIncomeTaxesTables</Role>
      <ShortName>Loss before Income Taxes (Tables)</ShortName>
      <MenuCategory>Tables</MenuCategory>
      <ParentRole>http://www.novon.com/20241231/taxonomy/role/DisclosureLossBeforeIncomeTaxes</ParentRole>
      <Position>46</Position>
    </Report>
    <Report instance="nvx-20241231.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R47.htm</HtmlFileName>
      <LongName>995877 - Disclosure - Income Tax (Benefit) Expense (Tables)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.novon.com/20241231/taxonomy/role/DisclosureIncomeTaxBenefitExpenseTables</Role>
      <ShortName>Income Tax (Benefit) Expense (Tables)</ShortName>
      <MenuCategory>Tables</MenuCategory>
      <ParentRole>http://www.novon.com/20241231/taxonomy/role/DisclosureIncomeTaxBenefitExpense</ParentRole>
      <Position>47</Position>
    </Report>
    <Report instance="nvx-20241231.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R48.htm</HtmlFileName>
      <LongName>995887 - Disclosure - Key Management Personnel Compensation (Tables)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.novon.com/20241231/taxonomy/role/Role_DisclosureKeyManagementPersonnelCompensationTables</Role>
      <ShortName>Key Management Personnel Compensation (Tables)</ShortName>
      <MenuCategory>Tables</MenuCategory>
      <ParentRole>http://www.novon.com/20241231/taxonomy/role/Role_DisclosureKeyManagementPersonnelCompensation</ParentRole>
      <Position>48</Position>
    </Report>
    <Report instance="nvx-20241231.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R49.htm</HtmlFileName>
      <LongName>995897 - Disclosure - Auditor???s Remuneration (Tables)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.novon.com/20241231/taxonomy/role/Role_DisclosureAuditorSRemunerationTables</Role>
      <ShortName>Auditor???s Remuneration (Tables)</ShortName>
      <MenuCategory>Tables</MenuCategory>
      <ParentRole>http://www.novon.com/20241231/taxonomy/role/Role_DisclosureAuditorSRemuneration</ParentRole>
      <Position>49</Position>
    </Report>
    <Report instance="nvx-20241231.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R50.htm</HtmlFileName>
      <LongName>995907 - Disclosure - Earnings per Share (Tables)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.novon.com/20241231/taxonomy/role/DisclosureEarningsPerShareTables</Role>
      <ShortName>Earnings per Share (Tables)</ShortName>
      <MenuCategory>Tables</MenuCategory>
      <ParentRole>http://www.novon.com/20241231/taxonomy/role/DisclosureEarningsPerShare1</ParentRole>
      <Position>50</Position>
    </Report>
    <Report instance="nvx-20241231.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R51.htm</HtmlFileName>
      <LongName>995937 - Disclosure - Trade and Other Receivable (Tables)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.novon.com/20241231/taxonomy/role/DisclosureTradeAndOtherReceivableTables</Role>
      <ShortName>Trade and Other Receivable (Tables)</ShortName>
      <MenuCategory>Tables</MenuCategory>
      <ParentRole>http://www.novon.com/20241231/taxonomy/role/Role_DisclosureTradeAndOtherReceivables</ParentRole>
      <Position>51</Position>
    </Report>
    <Report instance="nvx-20241231.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R52.htm</HtmlFileName>
      <LongName>995947 - Disclosure - Prepayments (Tables)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.novon.com/20241231/taxonomy/role/Role_DisclosurePrepaymentsTables</Role>
      <ShortName>Prepayments (Tables)</ShortName>
      <MenuCategory>Tables</MenuCategory>
      <ParentRole>http://www.novon.com/20241231/taxonomy/role/Role_DisclosurePrepayments</ParentRole>
      <Position>52</Position>
    </Report>
    <Report instance="nvx-20241231.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R53.htm</HtmlFileName>
      <LongName>995957 - Disclosure - Escrow Reserves (Tables)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.novon.com/20241231/taxonomy/role/DisclosureEscrowReservesTables</Role>
      <ShortName>Escrow Reserves (Tables)</ShortName>
      <MenuCategory>Tables</MenuCategory>
      <ParentRole>http://www.novon.com/20241231/taxonomy/role/DisclosureEscrowReserves1</ParentRole>
      <Position>53</Position>
    </Report>
    <Report instance="nvx-20241231.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R54.htm</HtmlFileName>
      <LongName>995967 - Disclosure - Inventory (Tables)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.novon.com/20241231/taxonomy/role/Role_DisclosureInventoryTables</Role>
      <ShortName>Inventory (Tables)</ShortName>
      <MenuCategory>Tables</MenuCategory>
      <ParentRole>http://www.novon.com/20241231/taxonomy/role/Role_DisclosureInventory</ParentRole>
      <Position>54</Position>
    </Report>
    <Report instance="nvx-20241231.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R55.htm</HtmlFileName>
      <LongName>995977 - Disclosure - Property, Plant and Equipment (Tables)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.novon.com/20241231/taxonomy/role/DisclosurePropertyPlantAndEquipmentTables</Role>
      <ShortName>Property, Plant and Equipment (Tables)</ShortName>
      <MenuCategory>Tables</MenuCategory>
      <ParentRole>http://www.novon.com/20241231/taxonomy/role/DisclosurePropertyPlantAndEquipment1</ParentRole>
      <Position>55</Position>
    </Report>
    <Report instance="nvx-20241231.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R56.htm</HtmlFileName>
      <LongName>995987 - Disclosure - Financial Assets at Fair Value Through Profit or Loss (Tables)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.novon.com/20241231/taxonomy/role/DisclosureFinancialAssetsAtFairValueThroughProfitOrLossTables</Role>
      <ShortName>Financial Assets at Fair Value Through Profit or Loss (Tables)</ShortName>
      <MenuCategory>Tables</MenuCategory>
      <ParentRole>http://www.novon.com/20241231/taxonomy/role/DisclosureFinancialAssetsAtFairValueThroughProfitOrLoss1</ParentRole>
      <Position>56</Position>
    </Report>
    <Report instance="nvx-20241231.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R57.htm</HtmlFileName>
      <LongName>995997 - Disclosure - Exploration and Evaluation Assets (Tables)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.novon.com/20241231/taxonomy/role/DisclosureExplorationAndEvaluationAssetsTables</Role>
      <ShortName>Exploration and Evaluation Assets (Tables)</ShortName>
      <MenuCategory>Tables</MenuCategory>
      <ParentRole>http://www.novon.com/20241231/taxonomy/role/DisclosureExplorationAndEvaluationAssets1</ParentRole>
      <Position>57</Position>
    </Report>
    <Report instance="nvx-20241231.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R58.htm</HtmlFileName>
      <LongName>996007 - Disclosure - Intangible Assets (Tables)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.novon.com/20241231/taxonomy/role/DisclosureIntangibleAssetsTables</Role>
      <ShortName>Intangible Assets (Tables)</ShortName>
      <MenuCategory>Tables</MenuCategory>
      <ParentRole>http://www.novon.com/20241231/taxonomy/role/DisclosureIntangibleAssets1</ParentRole>
      <Position>58</Position>
    </Report>
    <Report instance="nvx-20241231.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R59.htm</HtmlFileName>
      <LongName>996017 - Disclosure - Trade and Other Payables (Tables)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.novon.com/20241231/taxonomy/role/Role_DisclosureTradeAndOtherPayablesTables</Role>
      <ShortName>Trade and Other Payables (Tables)</ShortName>
      <MenuCategory>Tables</MenuCategory>
      <ParentRole>http://www.novon.com/20241231/taxonomy/role/Role_DisclosureTradeAndOtherPayables</ParentRole>
      <Position>59</Position>
    </Report>
    <Report instance="nvx-20241231.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R60.htm</HtmlFileName>
      <LongName>996027 - Disclosure - Contract Liabilities (Tables)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.novon.com/20241231/taxonomy/role/DisclosureContractLiabilitiesTables</Role>
      <ShortName>Contract Liabilities (Tables)</ShortName>
      <MenuCategory>Tables</MenuCategory>
      <ParentRole>http://www.novon.com/20241231/taxonomy/role/DisclosureContractLiabilities1</ParentRole>
      <Position>60</Position>
    </Report>
    <Report instance="nvx-20241231.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R61.htm</HtmlFileName>
      <LongName>996037 - Disclosure - Leases (Tables)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.novon.com/20241231/taxonomy/role/Role_DisclosureLeasesTables</Role>
      <ShortName>Leases (Tables)</ShortName>
      <MenuCategory>Tables</MenuCategory>
      <ParentRole>http://www.novon.com/20241231/taxonomy/role/Role_DisclosureLeases</ParentRole>
      <Position>61</Position>
    </Report>
    <Report instance="nvx-20241231.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R62.htm</HtmlFileName>
      <LongName>996047 - Disclosure - Borrowings (Tables)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.novon.com/20241231/taxonomy/role/Role_DisclosureBorrowingsTables</Role>
      <ShortName>Borrowings (Tables)</ShortName>
      <MenuCategory>Tables</MenuCategory>
      <ParentRole>http://www.novon.com/20241231/taxonomy/role/Role_DisclosureBorrowings</ParentRole>
      <Position>62</Position>
    </Report>
    <Report instance="nvx-20241231.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R63.htm</HtmlFileName>
      <LongName>996057 - Disclosure - Unsecured Convertible Loan Notes and Derivative Financial Instruments (Tables)</LongName>
      <ReportType>Notes</ReportType>
      <Role>http://www.novon.com/20241231/taxonomy/role/DisclosureUnsecuredConvertibleLoanNotesAndDerivativeFinancialInstrumentsTables</Role>
      <ShortName>Unsecured Convertible Loan Notes and Derivative Financial Instruments (Tables)</ShortName>
      <MenuCategory>Tables</MenuCategory>
      <ParentRole>http://www.novon.com/20241231/taxonomy/role/DisclosureUnsecuredConvertibleLoanNotesAndDerivativeFinancialInstruments</ParentRole>
      <Position>63</Position>
    </Report>
    <Report instance="nvx-20241231.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R64.htm</HtmlFileName>
      <LongName>996067 - Disclosure - Contributed Equity (Tables)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.novon.com/20241231/taxonomy/role/Role_DisclosureContributedEquityTables</Role>
      <ShortName>Contributed Equity (Tables)</ShortName>
      <MenuCategory>Tables</MenuCategory>
      <ParentRole>http://www.novon.com/20241231/taxonomy/role/Role_DisclosureContributedEquity</ParentRole>
      <Position>64</Position>
    </Report>
    <Report instance="nvx-20241231.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R65.htm</HtmlFileName>
      <LongName>996077 - Disclosure - Reserves (Tables)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.novon.com/20241231/taxonomy/role/Role_DisclosureReservesTables</Role>
      <ShortName>Reserves (Tables)</ShortName>
      <MenuCategory>Tables</MenuCategory>
      <ParentRole>http://www.novon.com/20241231/taxonomy/role/Role_DisclosureReserves</ParentRole>
      <Position>65</Position>
    </Report>
    <Report instance="nvx-20241231.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R66.htm</HtmlFileName>
      <LongName>996087 - Disclosure - Operating Segments (Tables)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.novon.com/20241231/taxonomy/role/Role_DisclosureOperatingSegmentsTables</Role>
      <ShortName>Operating Segments (Tables)</ShortName>
      <MenuCategory>Tables</MenuCategory>
      <ParentRole>http://www.novon.com/20241231/taxonomy/role/Role_DisclosureOperatingSegments</ParentRole>
      <Position>66</Position>
    </Report>
    <Report instance="nvx-20241231.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R67.htm</HtmlFileName>
      <LongName>996097 - Disclosure - Cash Flow Information (Tables)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.novon.com/20241231/taxonomy/role/Role_DisclosureCashFlowInformationTables</Role>
      <ShortName>Cash Flow Information (Tables)</ShortName>
      <MenuCategory>Tables</MenuCategory>
      <ParentRole>http://www.novon.com/20241231/taxonomy/role/Role_DisclosureCashFlowInformation</ParentRole>
      <Position>67</Position>
    </Report>
    <Report instance="nvx-20241231.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R68.htm</HtmlFileName>
      <LongName>996107 - Disclosure - Interests in Subsidiaries (Tables)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.novon.com/20241231/taxonomy/role/DisclosureInterestsInSubsidiariesTables</Role>
      <ShortName>Interests in Subsidiaries (Tables)</ShortName>
      <MenuCategory>Tables</MenuCategory>
      <ParentRole>http://www.novon.com/20241231/taxonomy/role/DisclosureInterestsInSubsidiaries1</ParentRole>
      <Position>68</Position>
    </Report>
    <Report instance="nvx-20241231.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R69.htm</HtmlFileName>
      <LongName>996117 - Disclosure - Share-based Payments (Tables)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.novon.com/20241231/taxonomy/role/DisclosureSharebasedPaymentsTables</Role>
      <ShortName>Share-based Payments (Tables)</ShortName>
      <MenuCategory>Tables</MenuCategory>
      <ParentRole>http://www.novon.com/20241231/taxonomy/role/DisclosureSharebasedPayments3</ParentRole>
      <Position>69</Position>
    </Report>
    <Report instance="nvx-20241231.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R70.htm</HtmlFileName>
      <LongName>996137 - Disclosure - Commitments and Contingencies (Tables)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.novon.com/20241231/taxonomy/role/DisclosureCommitmentsAndContingenciesTables</Role>
      <ShortName>Commitments and Contingencies (Tables)</ShortName>
      <MenuCategory>Tables</MenuCategory>
      <ParentRole>http://www.novon.com/20241231/taxonomy/role/DisclosureCommitmentsAndContingencies1</ParentRole>
      <Position>70</Position>
    </Report>
    <Report instance="nvx-20241231.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R71.htm</HtmlFileName>
      <LongName>996147 - Disclosure - Financial Risk Management (Tables)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.novon.com/20241231/taxonomy/role/Role_DisclosureFinancialRiskManagementTables</Role>
      <ShortName>Financial Risk Management (Tables)</ShortName>
      <MenuCategory>Tables</MenuCategory>
      <ParentRole>http://www.novon.com/20241231/taxonomy/role/Role_DisclosureFinancialRiskManagement</ParentRole>
      <Position>71</Position>
    </Report>
    <Report instance="nvx-20241231.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R72.htm</HtmlFileName>
      <LongName>996157 - Disclosure - Summary of Material Accounting Policy Information - Additional Information (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.novon.com/20241231/taxonomy/role/DisclosureSummaryOfMaterialAccountingPolicyInformationAdditionalInformationDetails</Role>
      <ShortName>Summary of Material Accounting Policy Information - Additional Information (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>72</Position>
    </Report>
    <Report instance="nvx-20241231.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R73.htm</HtmlFileName>
      <LongName>996177 - Disclosure - Summary of Material Accounting Policy Information - Summary of Property, Plant and Equipment Over Their Expected Useful Lives (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.novon.com/20241231/taxonomy/role/DisclosureSummaryOfMaterialAccountingPolicyInformationSummaryOfPropertyPlantAndEquipmentOverTheirExpectedUsefulLivesDetails</Role>
      <ShortName>Summary of Material Accounting Policy Information - Summary of Property, Plant and Equipment Over Their Expected Useful Lives (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>73</Position>
    </Report>
    <Report instance="nvx-20241231.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R74.htm</HtmlFileName>
      <LongName>996197 - Disclosure - Parent Entity Financial Information - Summary of Information Extracted from Books and Records of Parent (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.novon.com/20241231/taxonomy/role/DisclosureParentEntityFinancialInformationSummaryOfInformationExtractedFromBooksAndRecordsOfParentDetails</Role>
      <ShortName>Parent Entity Financial Information - Summary of Information Extracted from Books and Records of Parent (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>74</Position>
    </Report>
    <Report instance="nvx-20241231.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R75.htm</HtmlFileName>
      <LongName>996207 - Disclosure - Parent Entity Financial Information - Summary of Information Extracted from Books and Records of Parent 1 (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.novon.com/20241231/taxonomy/role/DisclosureParentEntityFinancialInformationSummaryOfInformationExtractedFromBooksAndRecordsOfParent1Details</Role>
      <ShortName>Parent Entity Financial Information - Summary of Information Extracted from Books and Records of Parent 1 (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>75</Position>
    </Report>
    <Report instance="nvx-20241231.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R76.htm</HtmlFileName>
      <LongName>996217 - Disclosure - Parent Entity Financial Information - Additional Information (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.novon.com/20241231/taxonomy/role/Role_DisclosureParentEntityFinancialInformationAdditionalInformationDetails</Role>
      <ShortName>Parent Entity Financial Information - Additional Information (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>76</Position>
    </Report>
    <Report instance="nvx-20241231.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R77.htm</HtmlFileName>
      <LongName>996227 - Disclosure - Revenue - Summary of Revenue From Transfer of Goods And Services (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.novon.com/20241231/taxonomy/role/DisclosureRevenueSummaryOfRevenueFromTransferOfGoodsAndServicesDetails</Role>
      <ShortName>Revenue - Summary of Revenue From Transfer of Goods And Services (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>77</Position>
    </Report>
    <Report instance="nvx-20241231.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R78.htm</HtmlFileName>
      <LongName>996237 - Disclosure - Revenue - Summary of Assets and Liabilities Related to Contracts with Customers Recognised (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.novon.com/20241231/taxonomy/role/Role_DisclosureRevenueSummaryOfAssetsAndLiabilitiesRelatedToContractsWithCustomersRecognisedDetails</Role>
      <ShortName>Revenue - Summary of Assets and Liabilities Related to Contracts with Customers Recognised (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>78</Position>
    </Report>
    <Report instance="nvx-20241231.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R79.htm</HtmlFileName>
      <LongName>996247 - Disclosure - Revenue - Summary of Revenue Recognised in Current Reporting Period Relates to Brought-Forward Contract Liabilities (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.novon.com/20241231/taxonomy/role/Role_DisclosureRevenueSummaryOfRevenueRecognisedInCurrentReportingPeriodRelatesToBroughtForwardContractLiabilitiesDetails</Role>
      <ShortName>Revenue - Summary of Revenue Recognised in Current Reporting Period Relates to Brought-Forward Contract Liabilities (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>79</Position>
    </Report>
    <Report instance="nvx-20241231.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R80.htm</HtmlFileName>
      <LongName>996257 - Disclosure - Revenue - Additional Information (Detail)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.novon.com/20241231/taxonomy/role/DisclosureRevenueAdditionalInformationDetail</Role>
      <ShortName>Revenue - Additional Information (Detail)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>80</Position>
    </Report>
    <Report instance="nvx-20241231.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R81.htm</HtmlFileName>
      <LongName>996267 - Disclosure - Other Income, Net - Summary of Other Income, Net (Detail)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.novon.com/20241231/taxonomy/role/DisclosureOtherIncomeNetSummaryOfOtherIncomeNetDetail</Role>
      <ShortName>Other Income, Net - Summary of Other Income, Net (Detail)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>81</Position>
    </Report>
    <Report instance="nvx-20241231.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R82.htm</HtmlFileName>
      <LongName>996277 - Disclosure - Other Income, Net - Additional Information (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.novon.com/20241231/taxonomy/role/DisclosureOtherIncomeNetAdditionalInformationDetails</Role>
      <ShortName>Other Income, Net - Additional Information (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>82</Position>
    </Report>
    <Report instance="nvx-20241231.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R83.htm</HtmlFileName>
      <LongName>996287 - Disclosure - Loss before Income Taxes - Loss Before Income Taxes (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.novon.com/20241231/taxonomy/role/DisclosureLossBeforeIncomeTaxesLossBeforeIncomeTaxesDetails</Role>
      <ShortName>Loss before Income Taxes - Loss Before Income Taxes (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>83</Position>
    </Report>
    <Report instance="nvx-20241231.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R84.htm</HtmlFileName>
      <LongName>996297 - Disclosure - Loss before Income Taxes - Schedule of Administrative and Other Expenses (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.novon.com/20241231/taxonomy/role/DisclosureLossBeforeIncomeTaxesScheduleOfAdministrativeAndOtherExpensesDetails</Role>
      <ShortName>Loss before Income Taxes - Schedule of Administrative and Other Expenses (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>84</Position>
    </Report>
    <Report instance="nvx-20241231.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R85.htm</HtmlFileName>
      <LongName>996307 - Disclosure - Income Tax (Benefit) Expense - Schedule of Components of Income Tax Expense (Benefit) and Deferred Tax Assets and Liabilities (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.novon.com/20241231/taxonomy/role/DisclosureIncomeTaxBenefitExpenseScheduleOfComponentsOfIncomeTaxExpenseBenefitAndDeferredTaxAssetsAndLiabilitiesDetails</Role>
      <ShortName>Income Tax (Benefit) Expense - Schedule of Components of Income Tax Expense (Benefit) and Deferred Tax Assets and Liabilities (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <ParentRole>http://www.novon.com/20241231/taxonomy/role/DisclosureIncomeTaxBenefitExpenseTables</ParentRole>
      <Position>85</Position>
    </Report>
    <Report instance="nvx-20241231.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R86.htm</HtmlFileName>
      <LongName>996317 - Disclosure - Income Tax (Benefit) Expense - Schedule of Components of Income Tax Expense (Benefit) and Deferred Tax Assets and Liabilities (Parenthetical) (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.novon.com/20241231/taxonomy/role/DisclosureIncomeTaxBenefitExpenseScheduleOfComponentsOfIncomeTaxExpenseBenefitAndDeferredTaxAssetsAndLiabilitiesParentheticalDetails</Role>
      <ShortName>Income Tax (Benefit) Expense - Schedule of Components of Income Tax Expense (Benefit) and Deferred Tax Assets and Liabilities (Parenthetical) (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <ParentRole>http://www.novon.com/20241231/taxonomy/role/DisclosureIncomeTaxBenefitExpenseTables</ParentRole>
      <Position>86</Position>
    </Report>
    <Report instance="nvx-20241231.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R87.htm</HtmlFileName>
      <LongName>996327 - Disclosure - Income Tax (Benefit) Expense (Additional Information) (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.novon.com/20241231/taxonomy/role/DisclosureIncomeTaxBenefitExpenseAdditionalInformationDetails</Role>
      <ShortName>Income Tax (Benefit) Expense (Additional Information) (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <ParentRole>http://www.novon.com/20241231/taxonomy/role/DisclosureIncomeTaxBenefitExpenseTables</ParentRole>
      <Position>87</Position>
    </Report>
    <Report instance="nvx-20241231.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R88.htm</HtmlFileName>
      <LongName>996337 - Disclosure - Key Management Personnel Compensation - Summary of Remuneration Paid to KMP of Company (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.novon.com/20241231/taxonomy/role/DisclosureKeyManagementPersonnelCompensationSummaryOfRemunerationPaidToKmpOfCompanyDetails</Role>
      <ShortName>Key Management Personnel Compensation - Summary of Remuneration Paid to KMP of Company (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>88</Position>
    </Report>
    <Report instance="nvx-20241231.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R89.htm</HtmlFileName>
      <LongName>996347 - Disclosure - Auditor's Remuneration - Summary of Detailed Information About Auditor's Remuneration (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.novon.com/20241231/taxonomy/role/DisclosureAuditorsRemunerationSummaryOfDetailedInformationAboutAuditorsRemunerationDetails</Role>
      <ShortName>Auditor's Remuneration - Summary of Detailed Information About Auditor's Remuneration (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>89</Position>
    </Report>
    <Report instance="nvx-20241231.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R90.htm</HtmlFileName>
      <LongName>996357 - Disclosure - Earnings per Share - Schedule of Earnings per Share (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.novon.com/20241231/taxonomy/role/DisclosureEarningsPerShareScheduleOfEarningsPerShareDetails</Role>
      <ShortName>Earnings per Share - Schedule of Earnings per Share (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>90</Position>
    </Report>
    <Report instance="nvx-20241231.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R91.htm</HtmlFileName>
      <LongName>996367 - Disclosure - Earnings per Share - Schedule of Reconciliations of Net Loss Used in Calculating Net Loss Per Share (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.novon.com/20241231/taxonomy/role/DisclosureEarningsPerShareScheduleOfReconciliationsOfNetLossUsedInCalculatingNetLossPerShareDetails</Role>
      <ShortName>Earnings per Share - Schedule of Reconciliations of Net Loss Used in Calculating Net Loss Per Share (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>91</Position>
    </Report>
    <Report instance="nvx-20241231.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R92.htm</HtmlFileName>
      <LongName>996377 - Disclosure - Earnings per Share - Schedule of Weighted Average Number of Shares Used as the Denominator (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.novon.com/20241231/taxonomy/role/DisclosureEarningsPerShareScheduleOfWeightedAverageNumberOfSharesUsedAsTheDenominatorDetails</Role>
      <ShortName>Earnings per Share - Schedule of Weighted Average Number of Shares Used as the Denominator (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>92</Position>
    </Report>
    <Report instance="nvx-20241231.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R93.htm</HtmlFileName>
      <LongName>996437 - Disclosure - Capital Raising - Schedule of Repayment of Convertible Notes (Parenthetical) (Details)</LongName>
      <ReportType>Notes</ReportType>
      <Role>http://www.novon.com/20241231/taxonomy/role/Role_DisclosureCapitalRaisingScheduleOfRepaymentOfConvertibleNotesParentheticalDetails</Role>
      <ShortName>Capital Raising - Schedule of Repayment of Convertible Notes (Parenthetical) (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>93</Position>
    </Report>
    <Report instance="nvx-20241231.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R94.htm</HtmlFileName>
      <LongName>996447 - Disclosure - Capital Raising - Schedule of Strategic Placement (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.novon.com/20241231/taxonomy/role/Role_DisclosureCapitalRaisingScheduleOfStrategicPlacementDetails</Role>
      <ShortName>Capital Raising - Schedule of Strategic Placement (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>94</Position>
    </Report>
    <Report instance="nvx-20241231.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R95.htm</HtmlFileName>
      <LongName>996487 - Disclosure - Trade and Other Receivables - Summary of Trade and Other Receivables (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.novon.com/20241231/taxonomy/role/DisclosureTradeAndOtherReceivablesSummaryOfTradeAndOtherReceivablesDetails</Role>
      <ShortName>Trade and Other Receivables - Summary of Trade and Other Receivables (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>95</Position>
    </Report>
    <Report instance="nvx-20241231.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R96.htm</HtmlFileName>
      <LongName>996497 - Disclosure - Trade and Other Receivables - Additional Information (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.novon.com/20241231/taxonomy/role/DisclosureTradeAndOtherReceivablesAdditionalInformationDetails</Role>
      <ShortName>Trade and Other Receivables - Additional Information (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>96</Position>
    </Report>
    <Report instance="nvx-20241231.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R97.htm</HtmlFileName>
      <LongName>996507 - Disclosure - Prepayments - Summary of Prepayments (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.novon.com/20241231/taxonomy/role/Role_DisclosurePrepaymentsSummaryOfPrepaymentsDetails</Role>
      <ShortName>Prepayments - Summary of Prepayments (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>97</Position>
    </Report>
    <Report instance="nvx-20241231.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R98.htm</HtmlFileName>
      <LongName>996517 - Disclosure - Prepayments - Additional Information (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.novon.com/20241231/taxonomy/role/DisclosurePrepaymentsAdditionalInformationDetails</Role>
      <ShortName>Prepayments - Additional Information (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>98</Position>
    </Report>
    <Report instance="nvx-20241231.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R99.htm</HtmlFileName>
      <LongName>996527 - Disclosure - Escrow Reserves - Summary of Escrow Reserves (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.novon.com/20241231/taxonomy/role/DisclosureEscrowReservesSummaryOfEscrowReservesDetails</Role>
      <ShortName>Escrow Reserves - Summary of Escrow Reserves (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>99</Position>
    </Report>
    <Report instance="nvx-20241231.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R100.htm</HtmlFileName>
      <LongName>996537 - Disclosure - Inventory - Summary of Inventory (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.novon.com/20241231/taxonomy/role/Role_DisclosureInventorySummaryOfInventoryDetails</Role>
      <ShortName>Inventory - Summary of Inventory (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>100</Position>
    </Report>
    <Report instance="nvx-20241231.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R101.htm</HtmlFileName>
      <LongName>996547 - Disclosure - Inventory - Additional Information (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.novon.com/20241231/taxonomy/role/Role_DisclosureInventoryAdditionalInformationDetails</Role>
      <ShortName>Inventory - Additional Information (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>101</Position>
    </Report>
    <Report instance="nvx-20241231.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R102.htm</HtmlFileName>
      <LongName>996557 - Disclosure - Property, Plant and Equipment - Summary of Property, Plant and Equipment (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.novon.com/20241231/taxonomy/role/DisclosurePropertyPlantAndEquipmentSummaryOfPropertyPlantAndEquipmentDetails</Role>
      <ShortName>Property, Plant and Equipment - Summary of Property, Plant and Equipment (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>102</Position>
    </Report>
    <Report instance="nvx-20241231.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R103.htm</HtmlFileName>
      <LongName>996567 - Disclosure - Financial Assets at Fair Value Through Profit or Loss - Summary of Financial Assets Mandatorily Measured at FVPL (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.novon.com/20241231/taxonomy/role/DisclosureFinancialAssetsAtFairValueThroughProfitOrLossSummaryOfFinancialAssetsMandatorilyMeasuredAtFvplDetails</Role>
      <ShortName>Financial Assets at Fair Value Through Profit or Loss - Summary of Financial Assets Mandatorily Measured at FVPL (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>103</Position>
    </Report>
    <Report instance="nvx-20241231.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R104.htm</HtmlFileName>
      <LongName>996577 - Disclosure - Financial Assets at Fair Value Through Profit or Loss - Additional Information (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.novon.com/20241231/taxonomy/role/DisclosureFinancialAssetsAtFairValueThroughProfitOrLossAdditionalInformationDetails</Role>
      <ShortName>Financial Assets at Fair Value Through Profit or Loss - Additional Information (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>104</Position>
    </Report>
    <Report instance="nvx-20241231.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R105.htm</HtmlFileName>
      <LongName>996587 - Disclosure - Financial Assets at Fair Value Through Profit or Loss - Summary of Changes in Level 3 Instruments (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.novon.com/20241231/taxonomy/role/DisclosureFinancialAssetsAtFairValueThroughProfitOrLossSummaryOfChangesInLevel3InstrumentsDetails</Role>
      <ShortName>Financial Assets at Fair Value Through Profit or Loss - Summary of Changes in Level 3 Instruments (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>105</Position>
    </Report>
    <Report instance="nvx-20241231.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R106.htm</HtmlFileName>
      <LongName>996597 - Disclosure - Exploration and Evaluation Assets - Schedule of Exploration and Evaluation Assets (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.novon.com/20241231/taxonomy/role/DisclosureExplorationAndEvaluationAssetsScheduleOfExplorationAndEvaluationAssetsDetails</Role>
      <ShortName>Exploration and Evaluation Assets - Schedule of Exploration and Evaluation Assets (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>106</Position>
    </Report>
    <Report instance="nvx-20241231.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R107.htm</HtmlFileName>
      <LongName>996607 - Disclosure - Exploration and Evaluation Assets - Schedule of Assets Classified as Held for Sale (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.novon.com/20241231/taxonomy/role/DisclosureExplorationAndEvaluationAssetsScheduleOfAssetsClassifiedAsHeldForSaleDetails</Role>
      <ShortName>Exploration and Evaluation Assets - Schedule of Assets Classified as Held for Sale (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>107</Position>
    </Report>
    <Report instance="nvx-20241231.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R108.htm</HtmlFileName>
      <LongName>996627 - Disclosure - Intangible Assets - Summary of Intangible Assets (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.novon.com/20241231/taxonomy/role/DisclosureIntangibleAssetsSummaryOfIntangibleAssetsDetails</Role>
      <ShortName>Intangible Assets - Summary of Intangible Assets (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>108</Position>
    </Report>
    <Report instance="nvx-20241231.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R109.htm</HtmlFileName>
      <LongName>996637 - Disclosure - Intangible Assets - Summary of Reconciliation of Intangible Assets (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.novon.com/20241231/taxonomy/role/DisclosureIntangibleAssetsSummaryOfReconciliationOfIntangibleAssetsDetails</Role>
      <ShortName>Intangible Assets - Summary of Reconciliation of Intangible Assets (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>109</Position>
    </Report>
    <Report instance="nvx-20241231.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R110.htm</HtmlFileName>
      <LongName>996657 - Disclosure - Trade and Other Payables - Summary of Unsecured Liabilities (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.novon.com/20241231/taxonomy/role/Role_DisclosureTradeAndOtherPayablesSummaryOfUnsecuredLiabilitiesDetails</Role>
      <ShortName>Trade and Other Payables - Summary of Unsecured Liabilities (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>110</Position>
    </Report>
    <Report instance="nvx-20241231.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R111.htm</HtmlFileName>
      <LongName>996667 - Disclosure - Contract Liabilities - Summary of Grant Funding (Detail)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.novon.com/20241231/taxonomy/role/DisclosureContractLiabilitiesSummaryOfGrantFundingDetail</Role>
      <ShortName>Contract Liabilities - Summary of Grant Funding (Detail)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>111</Position>
    </Report>
    <Report instance="nvx-20241231.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R112.htm</HtmlFileName>
      <LongName>996677 - Disclosure - Contract Liabilities - Additional Information (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.novon.com/20241231/taxonomy/role/DisclosureContractLiabilitiesAdditionalInformationDetails</Role>
      <ShortName>Contract Liabilities - Additional Information (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>112</Position>
    </Report>
    <Report instance="nvx-20241231.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R113.htm</HtmlFileName>
      <LongName>996687 - Disclosure - Leases - Summary of Leases Recognized in Balance Sheet (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.novon.com/20241231/taxonomy/role/DisclosureLeasesSummaryOfLeasesRecognizedInBalanceSheetDetails</Role>
      <ShortName>Leases - Summary of Leases Recognized in Balance Sheet (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>113</Position>
    </Report>
    <Report instance="nvx-20241231.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R114.htm</HtmlFileName>
      <LongName>996697 - Disclosure - Leases - Summary of Lease Amounts Recognized in Profit or Loss and Other Comprehensive Income (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.novon.com/20241231/taxonomy/role/DisclosureLeasesSummaryOfLeaseAmountsRecognizedInProfitOrLossAndOtherComprehensiveIncomeDetails</Role>
      <ShortName>Leases - Summary of Lease Amounts Recognized in Profit or Loss and Other Comprehensive Income (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>114</Position>
    </Report>
    <Report instance="nvx-20241231.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R115.htm</HtmlFileName>
      <LongName>996707 - Disclosure - Leases - Additional Information (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.novon.com/20241231/taxonomy/role/Role_DisclosureLeasesAdditionalInformationDetails</Role>
      <ShortName>Leases - Additional Information (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>115</Position>
    </Report>
    <Report instance="nvx-20241231.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R116.htm</HtmlFileName>
      <LongName>996717 - Disclosure - Borrowings - Summary of Borrowings (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.novon.com/20241231/taxonomy/role/Role_DisclosureBorrowingsSummaryOfBorrowingsDetails</Role>
      <ShortName>Borrowings - Summary of Borrowings (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>116</Position>
    </Report>
    <Report instance="nvx-20241231.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R117.htm</HtmlFileName>
      <LongName>996727 - Disclosure - Borrowings - Additional Information (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.novon.com/20241231/taxonomy/role/Role_DisclosureBorrowingsAdditionalInformationDetails</Role>
      <ShortName>Borrowings - Additional Information (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>117</Position>
    </Report>
    <Report instance="nvx-20241231.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R118.htm</HtmlFileName>
      <LongName>996737 - Disclosure - Unsecured Convertible Loan Notes and Derivative Financial Instruments - Additional Information (Details)</LongName>
      <ReportType>Notes</ReportType>
      <Role>http://www.novon.com/20241231/taxonomy/role/DisclosureUnsecuredConvertibleLoanNotesAndDerivativeFinancialInstrumentsAdditionalInformationDetails</Role>
      <ShortName>Unsecured Convertible Loan Notes and Derivative Financial Instruments - Additional Information (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>118</Position>
    </Report>
    <Report instance="nvx-20241231.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R119.htm</HtmlFileName>
      <LongName>996747 - Disclosure - Unsecured Convertible Loan Notes and Derivative Financial Instruments - Summary of Adoption of IAS in the Balance Sheet (Details)</LongName>
      <ReportType>Notes</ReportType>
      <Role>http://www.novon.com/20241231/taxonomy/role/DisclosureUnsecuredConvertibleLoanNotesAndDerivativeFinancialInstrumentsSummaryOfAdoptionOfIasInTheBalanceSheetDetails</Role>
      <ShortName>Unsecured Convertible Loan Notes and Derivative Financial Instruments - Summary of Adoption of IAS in the Balance Sheet (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>119</Position>
    </Report>
    <Report instance="nvx-20241231.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R120.htm</HtmlFileName>
      <LongName>996757 - Disclosure - Unsecured Convertible Loan Notes and Derivative Financial Instruments - Convertible Notes Presented in Consolidated Balance Sheet (Details)</LongName>
      <ReportType>Notes</ReportType>
      <Role>http://www.novon.com/20241231/taxonomy/role/DisclosureUnsecuredConvertibleLoanNotesAndDerivativeFinancialInstrumentsConvertibleNotesPresentedInConsolidatedBalanceSheetDetails</Role>
      <ShortName>Unsecured Convertible Loan Notes and Derivative Financial Instruments - Convertible Notes Presented in Consolidated Balance Sheet (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>120</Position>
    </Report>
    <Report instance="nvx-20241231.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R121.htm</HtmlFileName>
      <LongName>996767 - Disclosure - Unsecured Convertible Loan Notes and Derivative Financial Instruments - Summary of Convertible Notes Presented in Consolidated Balance Sheet (Parenthetical) (Details)</LongName>
      <ReportType>Notes</ReportType>
      <Role>http://www.novon.com/20241231/taxonomy/role/DisclosureUnsecuredConvertibleLoanNotesAndDerivativeFinancialInstrumentsSummaryOfConvertibleNotesPresentedInConsolidatedBalanceSheetParenthe</Role>
      <ShortName>Unsecured Convertible Loan Notes and Derivative Financial Instruments - Summary of Convertible Notes Presented in Consolidated Balance Sheet (Parenthetical) (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>121</Position>
    </Report>
    <Report instance="nvx-20241231.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R122.htm</HtmlFileName>
      <LongName>996777 - Disclosure - Contributed Equity - Additional Information (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.novon.com/20241231/taxonomy/role/DisclosureContributedEquityAdditionalInformationDetails</Role>
      <ShortName>Contributed Equity - Additional Information (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>122</Position>
    </Report>
    <Report instance="nvx-20241231.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R123.htm</HtmlFileName>
      <LongName>996787 - Disclosure - Contributed Equity - Schedule of Share Capital (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.novon.com/20241231/taxonomy/role/Role_DisclosureContributedEquityScheduleOfShareCapitalDetails</Role>
      <ShortName>Contributed Equity - Schedule of Share Capital (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>123</Position>
    </Report>
    <Report instance="nvx-20241231.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R124.htm</HtmlFileName>
      <LongName>996797 - Disclosure - Contributed Equity - Ordinary Share Capital (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.novon.com/20241231/taxonomy/role/Role_DisclosureContributedEquityOrdinaryShareCapitalDetails</Role>
      <ShortName>Contributed Equity - Ordinary Share Capital (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>124</Position>
    </Report>
    <Report instance="nvx-20241231.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R125.htm</HtmlFileName>
      <LongName>996807 - Disclosure - Contributed Equity - Ordinary Share Capital (Parenthetical) (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.novon.com/20241231/taxonomy/role/DisclosureContributedEquityOrdinaryShareCapitalParentheticalDetails</Role>
      <ShortName>Contributed Equity - Ordinary Share Capital (Parenthetical) (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>125</Position>
    </Report>
    <Report instance="nvx-20241231.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R126.htm</HtmlFileName>
      <LongName>996817 - Disclosure - Reserves - Summary of Reserves (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.novon.com/20241231/taxonomy/role/DisclosureReservesSummaryOfReservesDetails</Role>
      <ShortName>Reserves - Summary of Reserves (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>126</Position>
    </Report>
    <Report instance="nvx-20241231.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R127.htm</HtmlFileName>
      <LongName>996837 - Disclosure - Operating Segments - Schedule of Segment Performance (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.novon.com/20241231/taxonomy/role/Role_DisclosureOperatingSegmentsScheduleOfSegmentPerformanceDetails</Role>
      <ShortName>Operating Segments - Schedule of Segment Performance (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>127</Position>
    </Report>
    <Report instance="nvx-20241231.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R128.htm</HtmlFileName>
      <LongName>996847 - Disclosure - Operating Segments - Schedule of Segment Assets (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.novon.com/20241231/taxonomy/role/Role_DisclosureOperatingSegmentsScheduleOfSegmentAssetsDetails</Role>
      <ShortName>Operating Segments - Schedule of Segment Assets (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>128</Position>
    </Report>
    <Report instance="nvx-20241231.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R129.htm</HtmlFileName>
      <LongName>996857 - Disclosure - Operating Segments - Schedule of Segment Liabilities (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.novon.com/20241231/taxonomy/role/Role_DisclosureOperatingSegmentsScheduleOfSegmentLiabilitiesDetails</Role>
      <ShortName>Operating Segments - Schedule of Segment Liabilities (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>129</Position>
    </Report>
    <Report instance="nvx-20241231.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R130.htm</HtmlFileName>
      <LongName>996867 - Disclosure - Operating Segments - Additional Information (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.novon.com/20241231/taxonomy/role/DisclosureOperatingSegmentsAdditionalInformationDetails</Role>
      <ShortName>Operating Segments - Additional Information (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>130</Position>
    </Report>
    <Report instance="nvx-20241231.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R131.htm</HtmlFileName>
      <LongName>996877 - Disclosure - Cash Flow Information - Summary of Reconciliation of Profit / Loss to Net Cash Outflow from Operating Activities (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.novon.com/20241231/taxonomy/role/DisclosureCashFlowInformationSummaryOfReconciliationOfProfitLossToNetCashOutflowFromOperatingActivitiesDetails</Role>
      <ShortName>Cash Flow Information - Summary of Reconciliation of Profit / Loss to Net Cash Outflow from Operating Activities (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>131</Position>
    </Report>
    <Report instance="nvx-20241231.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R132.htm</HtmlFileName>
      <LongName>996887 - Disclosure - Cash Flow Information - Summary of Analysis of Net Debt and Movements in Net Debt (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.novon.com/20241231/taxonomy/role/DisclosureCashFlowInformationSummaryOfAnalysisOfNetDebtAndMovementsInNetDebtDetails3</Role>
      <ShortName>Cash Flow Information - Summary of Analysis of Net Debt and Movements in Net Debt (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>132</Position>
    </Report>
    <Report instance="nvx-20241231.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R133.htm</HtmlFileName>
      <LongName>996897 - Disclosure - Interests in Subsidiaries - Summary of Information About Principal Subsidiaries (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.novon.com/20241231/taxonomy/role/DisclosureInterestsInSubsidiariesSummaryOfInformationAboutPrincipalSubsidiariesDetails</Role>
      <ShortName>Interests in Subsidiaries - Summary of Information About Principal Subsidiaries (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>133</Position>
    </Report>
    <Report instance="nvx-20241231.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R134.htm</HtmlFileName>
      <LongName>996907 - Disclosure - Share-Based Payments - Additional Information (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.novon.com/20241231/taxonomy/role/DisclosureSharebasedPaymentsAdditionalInformationDetails</Role>
      <ShortName>Share-Based Payments - Additional Information (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>134</Position>
    </Report>
    <Report instance="nvx-20241231.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R135.htm</HtmlFileName>
      <LongName>996917 - Disclosure - Share-Based Payments - Composition of Share Based Payments Expense (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.novon.com/20241231/taxonomy/role/DisclosureSharebasedPaymentsCompositionOfShareBasedPaymentsExpenseDetails</Role>
      <ShortName>Share-Based Payments - Composition of Share Based Payments Expense (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>135</Position>
    </Report>
    <Report instance="nvx-20241231.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R136.htm</HtmlFileName>
      <LongName>996927 - Disclosure - Share-Based Payments - Summary of Movements of All Share Rights Issued (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.novon.com/20241231/taxonomy/role/DisclosureSharebasedPaymentsSummaryOfMovementsOfAllShareRightsIssuedDetails</Role>
      <ShortName>Share-Based Payments - Summary of Movements of All Share Rights Issued (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>136</Position>
    </Report>
    <Report instance="nvx-20241231.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R137.htm</HtmlFileName>
      <LongName>996937 - Disclosure - Share-Based Payments - Summary of Share Rights (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.novon.com/20241231/taxonomy/role/DisclosureSharebasedPaymentsSummaryOfShareRightsDetails</Role>
      <ShortName>Share-Based Payments - Summary of Share Rights (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>137</Position>
    </Report>
    <Report instance="nvx-20241231.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R138.htm</HtmlFileName>
      <LongName>996957 - Disclosure - Share-Based Payments - Summary of Movements of All Performance Rights Issued (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.novon.com/20241231/taxonomy/role/DisclosureSharebasedPaymentsSummaryOfMovementsOfAllPerformanceRightsIssuedDetails</Role>
      <ShortName>Share-Based Payments - Summary of Movements of All Performance Rights Issued (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>138</Position>
    </Report>
    <Report instance="nvx-20241231.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R139.htm</HtmlFileName>
      <LongName>996967 - Disclosure - Share-Based Payments - Summary of Performance Rights (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.novon.com/20241231/taxonomy/role/DisclosureSharebasedPaymentsSummaryOfPerformanceRightsDetails</Role>
      <ShortName>Share-Based Payments - Summary of Performance Rights (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>139</Position>
    </Report>
    <Report instance="nvx-20241231.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R140.htm</HtmlFileName>
      <LongName>996987 - Disclosure - Share-Based Payments - Summary of Group Net Settled in Share-Based Payments (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.novon.com/20241231/taxonomy/role/DisclosureSharebasedPaymentsSummaryOfGroupNetSettledInSharebasedPaymentsDetails</Role>
      <ShortName>Share-Based Payments - Summary of Group Net Settled in Share-Based Payments (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>140</Position>
    </Report>
    <Report instance="nvx-20241231.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R141.htm</HtmlFileName>
      <LongName>996997 - Disclosure - Share-Based Payments - Summary of Movements of Options Issued (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.novon.com/20241231/taxonomy/role/DisclosureSharebasedPaymentsSummaryOfMovementsOfOptionsIssuedDetails</Role>
      <ShortName>Share-Based Payments - Summary of Movements of Options Issued (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>141</Position>
    </Report>
    <Report instance="nvx-20241231.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R142.htm</HtmlFileName>
      <LongName>997017 - Disclosure - Related Party Transactions - Additional Information (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.novon.com/20241231/taxonomy/role/DisclosureRelatedPartyTransactionsAdditionalInformationDetails</Role>
      <ShortName>Related Party Transactions - Additional Information (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>142</Position>
    </Report>
    <Report instance="nvx-20241231.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R143.htm</HtmlFileName>
      <LongName>997027 - Disclosure - Commitments and Contingencies - Summary of Exploration Commitments (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.novon.com/20241231/taxonomy/role/DisclosureCommitmentsAndContingenciesSummaryOfExplorationCommitmentsDetails</Role>
      <ShortName>Commitments and Contingencies - Summary of Exploration Commitments (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>143</Position>
    </Report>
    <Report instance="nvx-20241231.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R144.htm</HtmlFileName>
      <LongName>997037 - Disclosure - Commitments and Contingencies - Summary of Significant Capital Expenditure Contracted (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.novon.com/20241231/taxonomy/role/DisclosureCommitmentsAndContingenciesSummaryOfSignificantCapitalExpenditureContractedDetails</Role>
      <ShortName>Commitments and Contingencies - Summary of Significant Capital Expenditure Contracted (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>144</Position>
    </Report>
    <Report instance="nvx-20241231.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R145.htm</HtmlFileName>
      <LongName>997047 - Disclosure - Financial Risk Management - Summary of Financial Instruments (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.novon.com/20241231/taxonomy/role/Role_DisclosureFinancialRiskManagementSummaryOfFinancialInstrumentsDetails</Role>
      <ShortName>Financial Risk Management - Summary of Financial Instruments (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>145</Position>
    </Report>
    <Report instance="nvx-20241231.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R146.htm</HtmlFileName>
      <LongName>997057 - Disclosure - Financial Risk Management - Schedule of Exposure to Foreign Currency Risk at the end of Reporting Period (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.novon.com/20241231/taxonomy/role/Role_DisclosureFinancialRiskManagementScheduleOfExposureToForeignCurrencyRiskAtEndOfReportingPeriodDetails</Role>
      <ShortName>Financial Risk Management - Schedule of Exposure to Foreign Currency Risk at the end of Reporting Period (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>146</Position>
    </Report>
    <Report instance="nvx-20241231.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R147.htm</HtmlFileName>
      <LongName>997067 - Disclosure - Financial Risk Management - Additional Information (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.novon.com/20241231/taxonomy/role/Role_DisclosureFinancialRiskManagementAdditionalInformationDetails</Role>
      <ShortName>Financial Risk Management - Additional Information (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>147</Position>
    </Report>
    <Report instance="nvx-20241231.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R148.htm</HtmlFileName>
      <LongName>997077 - Disclosure - Financial Risk Management - Summary of Contractual Maturities of Non-derivative Financial Liabilities (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.novon.com/20241231/taxonomy/role/Role_DisclosureFinancialRiskManagementSummaryOfContractualMaturitiesOfNonDerivativeFinancialLiabilitiesDetails</Role>
      <ShortName>Financial Risk Management - Summary of Contractual Maturities of Non-derivative Financial Liabilities (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>148</Position>
    </Report>
    <Report instance="nvx-20241231.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R149.htm</HtmlFileName>
      <LongName>997087 - Disclosure - Events After the Reporting Date - Additional Information (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.novon.com/20241231/taxonomy/role/DisclosureEventsAfterTheReportingDateAdditionalInformationDetails</Role>
      <ShortName>Events After the Reporting Date - Additional Information (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>149</Position>
    </Report>
    <Report instance="nvx-20241231.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R150.htm</HtmlFileName>
      <LongName>997097 - Disclosure - Unaudited Half Year Report - Additional Information (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.novon.com/20241231/taxonomy/role/DisclosureUnauditedHalfYearReportAdditionalInformationDetails</Role>
      <ShortName>Unaudited Half Year Report - Additional Information (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>150</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="20-F" isDefinitelyFs="true" isIfrs="true" isUsgaap="true" original="nvx-20241231.htm">nvx-20241231.htm</File>
    <File>nvx-20241231.xsd</File>
  </InputFiles>
  <SupplementalFiles>
    <File>img262142652_0.jpg</File>
    <File>img262142652_1.jpg</File>
    <File>img262142652_2.jpg</File>
    <File>img262142652_3.jpg</File>
    <File>img262142652_4.jpg</File>
    <File>img262142652_5.jpg</File>
    <File>img262142652_6.jpg</File>
    <File>img262142652_7.jpg</File>
    <File>img262142652_8.jpg</File>
  </SupplementalFiles>
  <BaseTaxonomies>
    <BaseTaxonomy items="1">http://fasb.org/us-gaap/2024</BaseTaxonomy>
    <BaseTaxonomy items="12">http://xbrl.sec.gov/cyd/2024</BaseTaxonomy>
    <BaseTaxonomy items="47">http://xbrl.sec.gov/dei/2024</BaseTaxonomy>
    <BaseTaxonomy items="1">http://xbrl.sec.gov/ecd/2024</BaseTaxonomy>
    <BaseTaxonomy items="1255">https://xbrl.ifrs.org/taxonomy/2024-03-27/ifrs-full</BaseTaxonomy>
  </BaseTaxonomies>
  <HasPresentationLinkbase>false</HasPresentationLinkbase>
  <HasCalculationLinkbase>false</HasCalculationLinkbase>
</FilingSummary>
