<?xml version='1.0' encoding='utf-8'?>
<FilingSummary>
  <Version>3.26.3</Version>
  <ProcessingTime/>
  <ReportFormat>html</ReportFormat>
  <ContextCount>436</ContextCount>
  <ElementCount>380</ElementCount>
  <EntityCount>1</EntityCount>
  <FootnotesReported>true</FootnotesReported>
  <SegmentCount>112</SegmentCount>
  <ScenarioCount>0</ScenarioCount>
  <TuplesReported>false</TuplesReported>
  <UnitCount>6</UnitCount>
  <MyReports>
    <Report instance="form20-f.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R1.htm</HtmlFileName>
      <LongName>00000001 - Document - Cover</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://bnlengrg.com/role/Cover</Role>
      <ShortName>Cover</ShortName>
      <MenuCategory>Cover</MenuCategory>
      <Position>1</Position>
    </Report>
    <Report instance="form20-f.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R2.htm</HtmlFileName>
      <LongName>00000002 - Statement - Consolidated Statements of Financial Position</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://bnlengrg.com/role/StatementsOfFinancialPosition</Role>
      <ShortName>Consolidated Statements of Financial Position</ShortName>
      <MenuCategory>Statements</MenuCategory>
      <Position>2</Position>
    </Report>
    <Report instance="form20-f.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R3.htm</HtmlFileName>
      <LongName>00000003 - Statement - Consolidated Statements of Profit or Loss and Other Comprehensive Income</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://bnlengrg.com/role/StatementsOfProfitOrLossAndOtherComprehensiveIncome</Role>
      <ShortName>Consolidated Statements of Profit or Loss and Other Comprehensive Income</ShortName>
      <MenuCategory>Statements</MenuCategory>
      <Position>3</Position>
    </Report>
    <Report instance="form20-f.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R4.htm</HtmlFileName>
      <LongName>00000004 - Statement - Consolidated Statements of Changes in Equity</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://bnlengrg.com/role/StatementsOfChangesInEquity</Role>
      <ShortName>Consolidated Statements of Changes in Equity</ShortName>
      <MenuCategory>Statements</MenuCategory>
      <Position>4</Position>
    </Report>
    <Report instance="form20-f.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R5.htm</HtmlFileName>
      <LongName>00000005 - Statement - Consolidated Statements of Changes in Equity (Parenthetical)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://bnlengrg.com/role/StatementsOfChangesInEquityParenthetical</Role>
      <ShortName>Consolidated Statements of Changes in Equity (Parenthetical)</ShortName>
      <MenuCategory>Statements</MenuCategory>
      <Position>5</Position>
    </Report>
    <Report instance="form20-f.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R6.htm</HtmlFileName>
      <LongName>00000006 - Statement - Consolidated Statements of Cash Flows</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://bnlengrg.com/role/StatementsOfCashFlows</Role>
      <ShortName>Consolidated Statements of Cash Flows</ShortName>
      <MenuCategory>Statements</MenuCategory>
      <Position>6</Position>
    </Report>
    <Report instance="form20-f.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R7.htm</HtmlFileName>
      <LongName>00000007 - Statement - Reconciliation of Liabilities Arising from Financing Activities</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://bnlengrg.com/role/ReconciliationOfLiabilitiesArisingFromFinancingActivities</Role>
      <ShortName>Reconciliation of Liabilities Arising from Financing Activities</ShortName>
      <MenuCategory>Statements</MenuCategory>
      <Position>7</Position>
    </Report>
    <Report instance="form20-f.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R8.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>8</Position>
    </Report>
    <Report instance="form20-f.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R9.htm</HtmlFileName>
      <LongName>995550 - Disclosure - Cybersecurity Risk Management and Strategy Disclosure</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://xbrl.sec.gov/cyd/role/CybersecurityRiskManagementAndStrategyDisclosure</Role>
      <ShortName>Cybersecurity Risk Management and Strategy Disclosure</ShortName>
      <MenuCategory>Notes</MenuCategory>
      <Position>9</Position>
    </Report>
    <Report instance="form20-f.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R10.htm</HtmlFileName>
      <LongName>999015 - Disclosure - Overview</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://bnlengrg.com/role/Overview</Role>
      <ShortName>Overview</ShortName>
      <MenuCategory>Notes</MenuCategory>
      <Position>10</Position>
    </Report>
    <Report instance="form20-f.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R11.htm</HtmlFileName>
      <LongName>999016 - Disclosure - Material accounting policy information</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://bnlengrg.com/role/MaterialAccountingPolicyInformation</Role>
      <ShortName>Material accounting policy information</ShortName>
      <MenuCategory>Notes</MenuCategory>
      <Position>11</Position>
    </Report>
    <Report instance="form20-f.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R12.htm</HtmlFileName>
      <LongName>999017 - Disclosure - Significant accounting judgements and estimates</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://bnlengrg.com/role/SignificantAccountingJudgementsAndEstimates</Role>
      <ShortName>Significant accounting judgements and estimates</ShortName>
      <MenuCategory>Notes</MenuCategory>
      <Position>12</Position>
    </Report>
    <Report instance="form20-f.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R13.htm</HtmlFileName>
      <LongName>999018 - Disclosure - Property, plant and equipment</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://bnlengrg.com/role/PropertyPlantAndEquipment</Role>
      <ShortName>Property, plant and equipment</ShortName>
      <MenuCategory>Notes</MenuCategory>
      <Position>13</Position>
    </Report>
    <Report instance="form20-f.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R14.htm</HtmlFileName>
      <LongName>999019 - Disclosure - Financial assets at fair value through profit or loss</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://bnlengrg.com/role/FinancialAssetsAtFairValueThroughProfitOrLoss</Role>
      <ShortName>Financial assets at fair value through profit or loss</ShortName>
      <MenuCategory>Notes</MenuCategory>
      <Position>14</Position>
    </Report>
    <Report instance="form20-f.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R15.htm</HtmlFileName>
      <LongName>999020 - Disclosure - Deferred initial public offering (“IPO”) costs</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://bnlengrg.com/role/DeferredInitialPublicOfferingIpoCosts</Role>
      <ShortName>Deferred initial public offering (“IPO”) costs</ShortName>
      <MenuCategory>Notes</MenuCategory>
      <Position>15</Position>
    </Report>
    <Report instance="form20-f.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R16.htm</HtmlFileName>
      <LongName>999021 - Disclosure - Trade and other receivables</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://bnlengrg.com/role/TradeAndOtherReceivables</Role>
      <ShortName>Trade and other receivables</ShortName>
      <MenuCategory>Notes</MenuCategory>
      <Position>16</Position>
    </Report>
    <Report instance="form20-f.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R17.htm</HtmlFileName>
      <LongName>999022 - Disclosure - Loans to third parties</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://bnlengrg.com/role/LoansToThirdParties</Role>
      <ShortName>Loans to third parties</ShortName>
      <MenuCategory>Notes</MenuCategory>
      <Position>17</Position>
    </Report>
    <Report instance="form20-f.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R18.htm</HtmlFileName>
      <LongName>999023 - Disclosure - Contract assets/liabilities</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://bnlengrg.com/role/ContractAssetsliabilities</Role>
      <ShortName>Contract assets/liabilities</ShortName>
      <MenuCategory>Notes</MenuCategory>
      <Position>18</Position>
    </Report>
    <Report instance="form20-f.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R19.htm</HtmlFileName>
      <LongName>999024 - Disclosure - Cash and cash equivalents</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://bnlengrg.com/role/CashAndCashEquivalents</Role>
      <ShortName>Cash and cash equivalents</ShortName>
      <MenuCategory>Notes</MenuCategory>
      <Position>19</Position>
    </Report>
    <Report instance="form20-f.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R20.htm</HtmlFileName>
      <LongName>999025 - Disclosure - Share capital</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://bnlengrg.com/role/ShareCapital</Role>
      <ShortName>Share capital</ShortName>
      <MenuCategory>Notes</MenuCategory>
      <Position>20</Position>
    </Report>
    <Report instance="form20-f.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R21.htm</HtmlFileName>
      <LongName>999026 - Disclosure - Reserves</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://bnlengrg.com/role/Reserves</Role>
      <ShortName>Reserves</ShortName>
      <MenuCategory>Notes</MenuCategory>
      <Position>21</Position>
    </Report>
    <Report instance="form20-f.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R22.htm</HtmlFileName>
      <LongName>999027 - Disclosure - Borrowings</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://bnlengrg.com/role/Borrowings</Role>
      <ShortName>Borrowings</ShortName>
      <MenuCategory>Notes</MenuCategory>
      <Position>22</Position>
    </Report>
    <Report instance="form20-f.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R23.htm</HtmlFileName>
      <LongName>999028 - Disclosure - Deferred tax liabilities</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://bnlengrg.com/role/DeferredTaxLiabilities</Role>
      <ShortName>Deferred tax liabilities</ShortName>
      <MenuCategory>Notes</MenuCategory>
      <Position>23</Position>
    </Report>
    <Report instance="form20-f.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R24.htm</HtmlFileName>
      <LongName>999029 - Disclosure - Trade and other payables</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://bnlengrg.com/role/TradeAndOtherPayables</Role>
      <ShortName>Trade and other payables</ShortName>
      <MenuCategory>Notes</MenuCategory>
      <Position>24</Position>
    </Report>
    <Report instance="form20-f.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R25.htm</HtmlFileName>
      <LongName>999030 - Disclosure - Revenue</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://bnlengrg.com/role/Revenue</Role>
      <ShortName>Revenue</ShortName>
      <MenuCategory>Notes</MenuCategory>
      <Position>25</Position>
    </Report>
    <Report instance="form20-f.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R26.htm</HtmlFileName>
      <LongName>999031 - Disclosure - Impairment loss on financial assets</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://bnlengrg.com/role/ImpairmentLossOnFinancialAssets</Role>
      <ShortName>Impairment loss on financial assets</ShortName>
      <MenuCategory>Notes</MenuCategory>
      <Position>26</Position>
    </Report>
    <Report instance="form20-f.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R27.htm</HtmlFileName>
      <LongName>999032 - Disclosure - Finance costs</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://bnlengrg.com/role/FinanceCosts</Role>
      <ShortName>Finance costs</ShortName>
      <MenuCategory>Notes</MenuCategory>
      <Position>27</Position>
    </Report>
    <Report instance="form20-f.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R28.htm</HtmlFileName>
      <LongName>999033 - Disclosure - Other income</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://bnlengrg.com/role/OtherIncome</Role>
      <ShortName>Other income</ShortName>
      <MenuCategory>Notes</MenuCategory>
      <Position>28</Position>
    </Report>
    <Report instance="form20-f.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R29.htm</HtmlFileName>
      <LongName>999034 - Disclosure - Cost of sales and administrative expenses</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://bnlengrg.com/role/CostOfSalesAndAdministrativeExpenses</Role>
      <ShortName>Cost of sales and administrative expenses</ShortName>
      <MenuCategory>Notes</MenuCategory>
      <Position>29</Position>
    </Report>
    <Report instance="form20-f.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R30.htm</HtmlFileName>
      <LongName>999035 - Disclosure - Income tax expense/(benefit)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://bnlengrg.com/role/IncomeTaxExpensebenefit</Role>
      <ShortName>Income tax expense/(benefit)</ShortName>
      <MenuCategory>Notes</MenuCategory>
      <Position>30</Position>
    </Report>
    <Report instance="form20-f.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R31.htm</HtmlFileName>
      <LongName>999036 - Disclosure - Significant related party transactions and balances</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://bnlengrg.com/role/SignificantRelatedPartyTransactionsAndBalances</Role>
      <ShortName>Significant related party transactions and balances</ShortName>
      <MenuCategory>Notes</MenuCategory>
      <Position>31</Position>
    </Report>
    <Report instance="form20-f.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R32.htm</HtmlFileName>
      <LongName>999037 - Disclosure - Segment reporting</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://bnlengrg.com/role/SegmentReporting</Role>
      <ShortName>Segment reporting</ShortName>
      <MenuCategory>Notes</MenuCategory>
      <Position>32</Position>
    </Report>
    <Report instance="form20-f.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R33.htm</HtmlFileName>
      <LongName>999038 - Disclosure - Financial risk management</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://bnlengrg.com/role/FinancialRiskManagement</Role>
      <ShortName>Financial risk management</ShortName>
      <MenuCategory>Notes</MenuCategory>
      <Position>33</Position>
    </Report>
    <Report instance="form20-f.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R34.htm</HtmlFileName>
      <LongName>999039 - Disclosure - Financial instruments by category</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://bnlengrg.com/role/FinancialInstrumentsByCategory</Role>
      <ShortName>Financial instruments by category</ShortName>
      <MenuCategory>Notes</MenuCategory>
      <Position>34</Position>
    </Report>
    <Report instance="form20-f.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R35.htm</HtmlFileName>
      <LongName>999040 - Disclosure - Fair value of assets and liabilities</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://bnlengrg.com/role/FairValueOfAssetsAndLiabilities</Role>
      <ShortName>Fair value of assets and liabilities</ShortName>
      <MenuCategory>Notes</MenuCategory>
      <Position>35</Position>
    </Report>
    <Report instance="form20-f.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R36.htm</HtmlFileName>
      <LongName>999041 - Disclosure - Capital management</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://bnlengrg.com/role/CapitalManagement</Role>
      <ShortName>Capital management</ShortName>
      <MenuCategory>Notes</MenuCategory>
      <Position>36</Position>
    </Report>
    <Report instance="form20-f.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R37.htm</HtmlFileName>
      <LongName>999042 - Disclosure - Commitments and contingencies</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://bnlengrg.com/role/CommitmentsAndContingencies</Role>
      <ShortName>Commitments and contingencies</ShortName>
      <MenuCategory>Notes</MenuCategory>
      <Position>37</Position>
    </Report>
    <Report instance="form20-f.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R38.htm</HtmlFileName>
      <LongName>999043 - Disclosure - Dividends paid</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://bnlengrg.com/role/DividendsPaid</Role>
      <ShortName>Dividends paid</ShortName>
      <MenuCategory>Notes</MenuCategory>
      <Position>38</Position>
    </Report>
    <Report instance="form20-f.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R39.htm</HtmlFileName>
      <LongName>999044 - Disclosure - Events after reporting period</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://bnlengrg.com/role/EventsAfterReportingPeriod</Role>
      <ShortName>Events after reporting period</ShortName>
      <MenuCategory>Notes</MenuCategory>
      <Position>39</Position>
    </Report>
    <Report instance="form20-f.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R40.htm</HtmlFileName>
      <LongName>999045 - Disclosure - Material accounting policy information (Policies)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://bnlengrg.com/role/MaterialAccountingPolicyInformationPolicies</Role>
      <ShortName>Material accounting policy information (Policies)</ShortName>
      <MenuCategory>Policies</MenuCategory>
      <Position>40</Position>
    </Report>
    <Report instance="form20-f.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R41.htm</HtmlFileName>
      <LongName>999046 - Disclosure - Overview (Tables)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://bnlengrg.com/role/OverviewTables</Role>
      <ShortName>Overview (Tables)</ShortName>
      <MenuCategory>Tables</MenuCategory>
      <ParentRole>http://bnlengrg.com/role/Overview</ParentRole>
      <Position>41</Position>
    </Report>
    <Report instance="form20-f.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R42.htm</HtmlFileName>
      <LongName>999047 - Disclosure - Material accounting policy information (Tables)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://bnlengrg.com/role/MaterialAccountingPolicyInformationTables</Role>
      <ShortName>Material accounting policy information (Tables)</ShortName>
      <MenuCategory>Tables</MenuCategory>
      <ParentRole>http://bnlengrg.com/role/MaterialAccountingPolicyInformation</ParentRole>
      <Position>42</Position>
    </Report>
    <Report instance="form20-f.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R43.htm</HtmlFileName>
      <LongName>999048 - Disclosure - Property, plant and equipment (Tables)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://bnlengrg.com/role/PropertyPlantAndEquipmentTables</Role>
      <ShortName>Property, plant and equipment (Tables)</ShortName>
      <MenuCategory>Tables</MenuCategory>
      <ParentRole>http://bnlengrg.com/role/PropertyPlantAndEquipment</ParentRole>
      <Position>43</Position>
    </Report>
    <Report instance="form20-f.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R44.htm</HtmlFileName>
      <LongName>999049 - Disclosure - Financial assets at fair value through profit or loss (Tables)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://bnlengrg.com/role/FinancialAssetsAtFairValueThroughProfitOrLossTables</Role>
      <ShortName>Financial assets at fair value through profit or loss (Tables)</ShortName>
      <MenuCategory>Tables</MenuCategory>
      <ParentRole>http://bnlengrg.com/role/FinancialAssetsAtFairValueThroughProfitOrLoss</ParentRole>
      <Position>44</Position>
    </Report>
    <Report instance="form20-f.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R45.htm</HtmlFileName>
      <LongName>999050 - Disclosure - Trade and other receivables (Tables)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://bnlengrg.com/role/TradeAndOtherReceivablesTables</Role>
      <ShortName>Trade and other receivables (Tables)</ShortName>
      <MenuCategory>Tables</MenuCategory>
      <ParentRole>http://bnlengrg.com/role/TradeAndOtherReceivables</ParentRole>
      <Position>45</Position>
    </Report>
    <Report instance="form20-f.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R46.htm</HtmlFileName>
      <LongName>999051 - Disclosure - Loans to third parties (Tables)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://bnlengrg.com/role/LoansToThirdPartiesTables</Role>
      <ShortName>Loans to third parties (Tables)</ShortName>
      <MenuCategory>Tables</MenuCategory>
      <ParentRole>http://bnlengrg.com/role/LoansToThirdParties</ParentRole>
      <Position>46</Position>
    </Report>
    <Report instance="form20-f.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R47.htm</HtmlFileName>
      <LongName>999052 - Disclosure - Contract assets/liabilities (Tables)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://bnlengrg.com/role/ContractAssetsliabilitiesTables</Role>
      <ShortName>Contract assets/liabilities (Tables)</ShortName>
      <MenuCategory>Tables</MenuCategory>
      <ParentRole>http://bnlengrg.com/role/ContractAssetsliabilities</ParentRole>
      <Position>47</Position>
    </Report>
    <Report instance="form20-f.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R48.htm</HtmlFileName>
      <LongName>999053 - Disclosure - Cash and cash equivalents (Tables)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://bnlengrg.com/role/CashAndCashEquivalentsTables</Role>
      <ShortName>Cash and cash equivalents (Tables)</ShortName>
      <MenuCategory>Tables</MenuCategory>
      <ParentRole>http://bnlengrg.com/role/CashAndCashEquivalents</ParentRole>
      <Position>48</Position>
    </Report>
    <Report instance="form20-f.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R49.htm</HtmlFileName>
      <LongName>999054 - Disclosure - Share capital (Tables)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://bnlengrg.com/role/ShareCapitalTables</Role>
      <ShortName>Share capital (Tables)</ShortName>
      <MenuCategory>Tables</MenuCategory>
      <ParentRole>http://bnlengrg.com/role/ShareCapital</ParentRole>
      <Position>49</Position>
    </Report>
    <Report instance="form20-f.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R50.htm</HtmlFileName>
      <LongName>999055 - Disclosure - Borrowings (Tables)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://bnlengrg.com/role/BorrowingsTables</Role>
      <ShortName>Borrowings (Tables)</ShortName>
      <MenuCategory>Tables</MenuCategory>
      <ParentRole>http://bnlengrg.com/role/Borrowings</ParentRole>
      <Position>50</Position>
    </Report>
    <Report instance="form20-f.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R51.htm</HtmlFileName>
      <LongName>999056 - Disclosure - Deferred tax liabilities (Tables)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://bnlengrg.com/role/DeferredTaxLiabilitiesTables</Role>
      <ShortName>Deferred tax liabilities (Tables)</ShortName>
      <MenuCategory>Tables</MenuCategory>
      <ParentRole>http://bnlengrg.com/role/DeferredTaxLiabilities</ParentRole>
      <Position>51</Position>
    </Report>
    <Report instance="form20-f.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R52.htm</HtmlFileName>
      <LongName>999057 - Disclosure - Trade and other payables (Tables)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://bnlengrg.com/role/TradeAndOtherPayablesTables</Role>
      <ShortName>Trade and other payables (Tables)</ShortName>
      <MenuCategory>Tables</MenuCategory>
      <ParentRole>http://bnlengrg.com/role/TradeAndOtherPayables</ParentRole>
      <Position>52</Position>
    </Report>
    <Report instance="form20-f.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R53.htm</HtmlFileName>
      <LongName>999059 - Disclosure - Impairment loss on financial assets (Tables)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://bnlengrg.com/role/ImpairmentLossOnFinancialAssetsTables</Role>
      <ShortName>Impairment loss on financial assets (Tables)</ShortName>
      <MenuCategory>Tables</MenuCategory>
      <ParentRole>http://bnlengrg.com/role/ImpairmentLossOnFinancialAssets</ParentRole>
      <Position>53</Position>
    </Report>
    <Report instance="form20-f.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R54.htm</HtmlFileName>
      <LongName>999060 - Disclosure - Finance costs (Tables)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://bnlengrg.com/role/FinanceCostsTables</Role>
      <ShortName>Finance costs (Tables)</ShortName>
      <MenuCategory>Tables</MenuCategory>
      <ParentRole>http://bnlengrg.com/role/FinanceCosts</ParentRole>
      <Position>54</Position>
    </Report>
    <Report instance="form20-f.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R55.htm</HtmlFileName>
      <LongName>999061 - Disclosure - Other income (Tables)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://bnlengrg.com/role/OtherIncomeTables</Role>
      <ShortName>Other income (Tables)</ShortName>
      <MenuCategory>Tables</MenuCategory>
      <ParentRole>http://bnlengrg.com/role/OtherIncome</ParentRole>
      <Position>55</Position>
    </Report>
    <Report instance="form20-f.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R56.htm</HtmlFileName>
      <LongName>999062 - Disclosure - Cost of sales and administrative expenses (Tables)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://bnlengrg.com/role/CostOfSalesAndAdministrativeExpensesTables</Role>
      <ShortName>Cost of sales and administrative expenses (Tables)</ShortName>
      <MenuCategory>Tables</MenuCategory>
      <ParentRole>http://bnlengrg.com/role/CostOfSalesAndAdministrativeExpenses</ParentRole>
      <Position>56</Position>
    </Report>
    <Report instance="form20-f.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R57.htm</HtmlFileName>
      <LongName>999063 - Disclosure - Income tax expense/(benefit) (Tables)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://bnlengrg.com/role/IncomeTaxExpensebenefitTables</Role>
      <ShortName>Income tax expense/(benefit) (Tables)</ShortName>
      <MenuCategory>Tables</MenuCategory>
      <ParentRole>http://bnlengrg.com/role/IncomeTaxExpensebenefit</ParentRole>
      <Position>57</Position>
    </Report>
    <Report instance="form20-f.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R58.htm</HtmlFileName>
      <LongName>999064 - Disclosure - Significant related party transactions and balances (Tables)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://bnlengrg.com/role/SignificantRelatedPartyTransactionsAndBalancesTables</Role>
      <ShortName>Significant related party transactions and balances (Tables)</ShortName>
      <MenuCategory>Tables</MenuCategory>
      <ParentRole>http://bnlengrg.com/role/SignificantRelatedPartyTransactionsAndBalances</ParentRole>
      <Position>58</Position>
    </Report>
    <Report instance="form20-f.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R59.htm</HtmlFileName>
      <LongName>999065 - Disclosure - Segment reporting (Tables)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://bnlengrg.com/role/SegmentReportingTables</Role>
      <ShortName>Segment reporting (Tables)</ShortName>
      <MenuCategory>Tables</MenuCategory>
      <ParentRole>http://bnlengrg.com/role/SegmentReporting</ParentRole>
      <Position>59</Position>
    </Report>
    <Report instance="form20-f.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R60.htm</HtmlFileName>
      <LongName>999066 - Disclosure - Financial risk management (Tables)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://bnlengrg.com/role/FinancialRiskManagementTables</Role>
      <ShortName>Financial risk management (Tables)</ShortName>
      <MenuCategory>Tables</MenuCategory>
      <ParentRole>http://bnlengrg.com/role/FinancialRiskManagement</ParentRole>
      <Position>60</Position>
    </Report>
    <Report instance="form20-f.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R61.htm</HtmlFileName>
      <LongName>999067 - Disclosure - Financial instruments by category (Tables)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://bnlengrg.com/role/FinancialInstrumentsByCategoryTables</Role>
      <ShortName>Financial instruments by category (Tables)</ShortName>
      <MenuCategory>Tables</MenuCategory>
      <ParentRole>http://bnlengrg.com/role/FinancialInstrumentsByCategory</ParentRole>
      <Position>61</Position>
    </Report>
    <Report instance="form20-f.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R62.htm</HtmlFileName>
      <LongName>999068 - Disclosure - Fair value of assets and liabilities (Tables)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://bnlengrg.com/role/FairValueOfAssetsAndLiabilitiesTables</Role>
      <ShortName>Fair value of assets and liabilities (Tables)</ShortName>
      <MenuCategory>Tables</MenuCategory>
      <ParentRole>http://bnlengrg.com/role/FairValueOfAssetsAndLiabilities</ParentRole>
      <Position>62</Position>
    </Report>
    <Report instance="form20-f.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R63.htm</HtmlFileName>
      <LongName>999069 - Disclosure - Schedule of company’s subsidiaries (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://bnlengrg.com/role/ScheduleOfCompanysSubsidiariesDetails</Role>
      <ShortName>Schedule of company’s subsidiaries (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>63</Position>
    </Report>
    <Report instance="form20-f.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R64.htm</HtmlFileName>
      <LongName>999070 - Disclosure - Overview (Details Narrative)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://bnlengrg.com/role/OverviewDetailsNarrative</Role>
      <ShortName>Overview (Details Narrative)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <ParentRole>http://bnlengrg.com/role/OverviewTables</ParentRole>
      <Position>64</Position>
    </Report>
    <Report instance="form20-f.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R65.htm</HtmlFileName>
      <LongName>999071 - Disclosure - Schedule of estimated useful lives of property, plant and equipment (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://bnlengrg.com/role/ScheduleOfEstimatedUsefulLivesOfPropertyPlantAndEquipmentDetails</Role>
      <ShortName>Schedule of estimated useful lives of property, plant and equipment (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>65</Position>
    </Report>
    <Report instance="form20-f.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R66.htm</HtmlFileName>
      <LongName>999072 - Disclosure - Schedule of property, plant and equipment (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://bnlengrg.com/role/ScheduleOfPropertyPlantAndEquipmentDetails</Role>
      <ShortName>Schedule of property, plant and equipment (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>66</Position>
    </Report>
    <Report instance="form20-f.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R67.htm</HtmlFileName>
      <LongName>999073 - Disclosure - Property, plant and equipment (Details Narrative)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://bnlengrg.com/role/PropertyPlantAndEquipmentDetailsNarrative</Role>
      <ShortName>Property, plant and equipment (Details Narrative)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <ParentRole>http://bnlengrg.com/role/PropertyPlantAndEquipmentTables</ParentRole>
      <Position>67</Position>
    </Report>
    <Report instance="form20-f.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R68.htm</HtmlFileName>
      <LongName>999074 - Disclosure - Schedule of financial assets fair value through profit or loss (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://bnlengrg.com/role/ScheduleOfFinancialAssetsFairValueThroughProfitOrLossDetails</Role>
      <ShortName>Schedule of financial assets fair value through profit or loss (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>68</Position>
    </Report>
    <Report instance="form20-f.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R69.htm</HtmlFileName>
      <LongName>999075 - Disclosure - Financial assets at fair value through profit or loss (Details Narrative)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://bnlengrg.com/role/FinancialAssetsAtFairValueThroughProfitOrLossDetailsNarrative</Role>
      <ShortName>Financial assets at fair value through profit or loss (Details Narrative)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <ParentRole>http://bnlengrg.com/role/FinancialAssetsAtFairValueThroughProfitOrLossTables</ParentRole>
      <Position>69</Position>
    </Report>
    <Report instance="form20-f.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R70.htm</HtmlFileName>
      <LongName>999076 - Disclosure - Deferred initial public offering (“IPO”) costs (Details Narrative)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://bnlengrg.com/role/DeferredInitialPublicOfferingIpoCostsDetailsNarrative</Role>
      <ShortName>Deferred initial public offering (“IPO”) costs (Details Narrative)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <ParentRole>http://bnlengrg.com/role/DeferredInitialPublicOfferingIpoCosts</ParentRole>
      <Position>70</Position>
    </Report>
    <Report instance="form20-f.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R71.htm</HtmlFileName>
      <LongName>999077 - Disclosure - Schedule of trade and other receivables (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://bnlengrg.com/role/ScheduleOfTradeAndOtherReceivablesDetails</Role>
      <ShortName>Schedule of trade and other receivables (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>71</Position>
    </Report>
    <Report instance="form20-f.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R72.htm</HtmlFileName>
      <LongName>999078 - Disclosure - Schedule of allowance for credit losses for trade and other receivables (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://bnlengrg.com/role/ScheduleOfAllowanceForCreditLossesForTradeAndOtherReceivablesDetails</Role>
      <ShortName>Schedule of allowance for credit losses for trade and other receivables (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>72</Position>
    </Report>
    <Report instance="form20-f.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R73.htm</HtmlFileName>
      <LongName>999079 - Disclosure - Schedule of loans to third parties (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://bnlengrg.com/role/ScheduleOfLoansToThirdPartiesDetails</Role>
      <ShortName>Schedule of loans to third parties (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>73</Position>
    </Report>
    <Report instance="form20-f.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R74.htm</HtmlFileName>
      <LongName>999080 - Disclosure - Loans to third parties (Details Narrative)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://bnlengrg.com/role/LoansToThirdPartiesDetailsNarrative</Role>
      <ShortName>Loans to third parties (Details Narrative)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <ParentRole>http://bnlengrg.com/role/LoansToThirdPartiesTables</ParentRole>
      <Position>74</Position>
    </Report>
    <Report instance="form20-f.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R75.htm</HtmlFileName>
      <LongName>999081 - Disclosure - Schedule of contract assets/liabilities (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://bnlengrg.com/role/ScheduleOfContractAssetsliabilitiesDetails</Role>
      <ShortName>Schedule of contract assets/liabilities (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>75</Position>
    </Report>
    <Report instance="form20-f.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R76.htm</HtmlFileName>
      <LongName>999082 - Disclosure - Schedule of contract assets (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://bnlengrg.com/role/ScheduleOfContractAssetsDetails</Role>
      <ShortName>Schedule of contract assets (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>76</Position>
    </Report>
    <Report instance="form20-f.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R77.htm</HtmlFileName>
      <LongName>999083 - Disclosure - Schedule of allowance for expected credit losses of contract assets (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://bnlengrg.com/role/ScheduleOfAllowanceForExpectedCreditLossesOfContractAssetsDetails</Role>
      <ShortName>Schedule of allowance for expected credit losses of contract assets (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>77</Position>
    </Report>
    <Report instance="form20-f.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R78.htm</HtmlFileName>
      <LongName>999084 - Disclosure - Schedule of amount of revenue contract liabilities (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://bnlengrg.com/role/ScheduleOfAmountOfRevenueContractLiabilitiesDetails</Role>
      <ShortName>Schedule of amount of revenue contract liabilities (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>78</Position>
    </Report>
    <Report instance="form20-f.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R79.htm</HtmlFileName>
      <LongName>999085 - Disclosure - Schedule of transaction price allocated to remaining performance obligations (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://bnlengrg.com/role/ScheduleOfTransactionPriceAllocatedToRemainingPerformanceObligationsDetails</Role>
      <ShortName>Schedule of transaction price allocated to remaining performance obligations (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>79</Position>
    </Report>
    <Report instance="form20-f.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R80.htm</HtmlFileName>
      <LongName>999086 - Disclosure - Schedule of cash and cash equivalents (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://bnlengrg.com/role/ScheduleOfCashAndCashEquivalentsDetails</Role>
      <ShortName>Schedule of cash and cash equivalents (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>80</Position>
    </Report>
    <Report instance="form20-f.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R81.htm</HtmlFileName>
      <LongName>999087 - Disclosure - Schedule of share capital shares (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://bnlengrg.com/role/ScheduleOfShareCapitalSharesDetails</Role>
      <ShortName>Schedule of share capital shares (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>81</Position>
    </Report>
    <Report instance="form20-f.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R82.htm</HtmlFileName>
      <LongName>999088 - Disclosure - Share capital (Details Narrative)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://bnlengrg.com/role/ShareCapitalDetailsNarrative</Role>
      <ShortName>Share capital (Details Narrative)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <ParentRole>http://bnlengrg.com/role/ShareCapitalTables</ParentRole>
      <Position>82</Position>
    </Report>
    <Report instance="form20-f.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R83.htm</HtmlFileName>
      <LongName>999089 - Disclosure - Reserves (Details Narrative)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://bnlengrg.com/role/ReservesDetailsNarrative</Role>
      <ShortName>Reserves (Details Narrative)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <ParentRole>http://bnlengrg.com/role/Reserves</ParentRole>
      <Position>83</Position>
    </Report>
    <Report instance="form20-f.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R84.htm</HtmlFileName>
      <LongName>999090 - Disclosure - Schedule of borrowings (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://bnlengrg.com/role/ScheduleOfBorrowingsDetails</Role>
      <ShortName>Schedule of borrowings (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>84</Position>
    </Report>
    <Report instance="form20-f.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R85.htm</HtmlFileName>
      <LongName>999091 - Disclosure - Schedule of bank borrowings comprised (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://bnlengrg.com/role/ScheduleOfBankBorrowingsComprisedDetails</Role>
      <ShortName>Schedule of bank borrowings comprised (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>85</Position>
    </Report>
    <Report instance="form20-f.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R86.htm</HtmlFileName>
      <LongName>999092 - Disclosure - Schedule of carrying amounts of right of use assets presented within property, plant and equipment (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://bnlengrg.com/role/ScheduleOfCarryingAmountsOfRightOfUseAssetsPresentedWithinPropertyPlantAndEquipmentDetails</Role>
      <ShortName>Schedule of carrying amounts of right of use assets presented within property, plant and equipment (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>86</Position>
    </Report>
    <Report instance="form20-f.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R87.htm</HtmlFileName>
      <LongName>999093 - Disclosure - Schedule of lease liabilities (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://bnlengrg.com/role/ScheduleOfLeaseLiabilitiesDetails</Role>
      <ShortName>Schedule of lease liabilities (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>87</Position>
    </Report>
    <Report instance="form20-f.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R88.htm</HtmlFileName>
      <LongName>999094 - Disclosure - Schedule of amounts related to lease recognized in profit or loss (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://bnlengrg.com/role/ScheduleOfAmountsRelatedToLeaseRecognizedInProfitOrLossDetails</Role>
      <ShortName>Schedule of amounts related to lease recognized in profit or loss (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>88</Position>
    </Report>
    <Report instance="form20-f.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R89.htm</HtmlFileName>
      <LongName>999095 - Disclosure - Borrowings (Details Narrative)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://bnlengrg.com/role/BorrowingsDetailsNarrative</Role>
      <ShortName>Borrowings (Details Narrative)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <ParentRole>http://bnlengrg.com/role/BorrowingsTables</ParentRole>
      <Position>89</Position>
    </Report>
    <Report instance="form20-f.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R90.htm</HtmlFileName>
      <LongName>999096 - Disclosure - Schedule of movements in deferred tax liabilities (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://bnlengrg.com/role/ScheduleOfMovementsInDeferredTaxLiabilitiesDetails</Role>
      <ShortName>Schedule of movements in deferred tax liabilities (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>90</Position>
    </Report>
    <Report instance="form20-f.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R91.htm</HtmlFileName>
      <LongName>999097 - Disclosure - Schedule of trade and other payables (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://bnlengrg.com/role/ScheduleOfTradeAndOtherPayablesDetails</Role>
      <ShortName>Schedule of trade and other payables (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>91</Position>
    </Report>
    <Report instance="form20-f.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R92.htm</HtmlFileName>
      <LongName>999098 - Disclosure - Trade and other payables (Details Narrative)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://bnlengrg.com/role/TradeAndOtherPayablesDetailsNarrative</Role>
      <ShortName>Trade and other payables (Details Narrative)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <ParentRole>http://bnlengrg.com/role/TradeAndOtherPayablesTables</ParentRole>
      <Position>92</Position>
    </Report>
    <Report instance="form20-f.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R93.htm</HtmlFileName>
      <LongName>999099 - Disclosure - Schedule of Revenue (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://bnlengrg.com/role/ScheduleOfRevenueDetails</Role>
      <ShortName>Schedule of Revenue (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>93</Position>
    </Report>
    <Report instance="form20-f.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R94.htm</HtmlFileName>
      <LongName>999100 - Disclosure - Schedule of Impairment Loss on Financial Assets (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://bnlengrg.com/role/ScheduleOfImpairmentLossOnFinancialAssetsDetails</Role>
      <ShortName>Schedule of Impairment Loss on Financial Assets (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>94</Position>
    </Report>
    <Report instance="form20-f.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R95.htm</HtmlFileName>
      <LongName>999101 - Disclosure - Schedule of Finance Costs (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://bnlengrg.com/role/ScheduleOfFinanceCostsDetails</Role>
      <ShortName>Schedule of Finance Costs (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>95</Position>
    </Report>
    <Report instance="form20-f.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R96.htm</HtmlFileName>
      <LongName>999102 - Disclosure - Schedule of Other Income (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://bnlengrg.com/role/ScheduleOfOtherIncomeDetails</Role>
      <ShortName>Schedule of Other Income (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>96</Position>
    </Report>
    <Report instance="form20-f.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R97.htm</HtmlFileName>
      <LongName>999103 - Disclosure - Schedule of cost of sales and administrative expenses (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://bnlengrg.com/role/ScheduleOfCostOfSalesAndAdministrativeExpensesDetails</Role>
      <ShortName>Schedule of cost of sales and administrative expenses (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>97</Position>
    </Report>
    <Report instance="form20-f.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R98.htm</HtmlFileName>
      <LongName>999104 - Disclosure - Schedule of components of income tax expense recognized in profit or loss (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://bnlengrg.com/role/ScheduleOfComponentsOfIncomeTaxExpenseRecognizedInProfitOrLossDetails</Role>
      <ShortName>Schedule of components of income tax expense recognized in profit or loss (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>98</Position>
    </Report>
    <Report instance="form20-f.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R99.htm</HtmlFileName>
      <LongName>999105 - Disclosure - Schedule of reconciliation between tax expense and product (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://bnlengrg.com/role/ScheduleOfReconciliationBetweenTaxExpenseAndProductDetails</Role>
      <ShortName>Schedule of reconciliation between tax expense and product (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>99</Position>
    </Report>
    <Report instance="form20-f.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R100.htm</HtmlFileName>
      <LongName>999106 - Disclosure - Schedule of reconciliation between tax expense and the product (Details) (Parenthetical)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://bnlengrg.com/role/ScheduleOfReconciliationBetweenTaxExpenseAndProductDetailsParenthetical</Role>
      <ShortName>Schedule of reconciliation between tax expense and the product (Details) (Parenthetical)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>100</Position>
    </Report>
    <Report instance="form20-f.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R101.htm</HtmlFileName>
      <LongName>999107 - Disclosure - Schedule of unrecognized deferred tax assets (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://bnlengrg.com/role/ScheduleOfUnrecognizedDeferredTaxAssetsDetails</Role>
      <ShortName>Schedule of unrecognized deferred tax assets (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>101</Position>
    </Report>
    <Report instance="form20-f.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R102.htm</HtmlFileName>
      <LongName>999108 - Disclosure - Schedule of deferred tax assets not recognized (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://bnlengrg.com/role/ScheduleOfDeferredTaxAssetsNotRecognizedDetails</Role>
      <ShortName>Schedule of deferred tax assets not recognized (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>102</Position>
    </Report>
    <Report instance="form20-f.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R103.htm</HtmlFileName>
      <LongName>999109 - Disclosure - Income tax expense/(benefit) (Details Narrative)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://bnlengrg.com/role/IncomeTaxExpensebenefitDetailsNarrative</Role>
      <ShortName>Income tax expense/(benefit) (Details Narrative)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <ParentRole>http://bnlengrg.com/role/IncomeTaxExpensebenefitTables</ParentRole>
      <Position>103</Position>
    </Report>
    <Report instance="form20-f.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R104.htm</HtmlFileName>
      <LongName>999110 - Disclosure - Schedule of transaction with related parties (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://bnlengrg.com/role/ScheduleOfTransactionWithRelatedPartiesDetails</Role>
      <ShortName>Schedule of transaction with related parties (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>104</Position>
    </Report>
    <Report instance="form20-f.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R105.htm</HtmlFileName>
      <LongName>999111 - Disclosure - Schedule of balances with related parties (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://bnlengrg.com/role/ScheduleOfBalancesWithRelatedPartiesDetails</Role>
      <ShortName>Schedule of balances with related parties (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>105</Position>
    </Report>
    <Report instance="form20-f.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R106.htm</HtmlFileName>
      <LongName>999112 - Disclosure - Schedule of compensation of key management personnel (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://bnlengrg.com/role/ScheduleOfCompensationOfKeyManagementPersonnelDetails</Role>
      <ShortName>Schedule of compensation of key management personnel (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>106</Position>
    </Report>
    <Report instance="form20-f.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R107.htm</HtmlFileName>
      <LongName>999113 - Disclosure - Schedule of segment reporting (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://bnlengrg.com/role/ScheduleOfSegmentReportingDetails</Role>
      <ShortName>Schedule of segment reporting (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>107</Position>
    </Report>
    <Report instance="form20-f.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R108.htm</HtmlFileName>
      <LongName>999114 - Disclosure - Schedule of maximum exposure to credit risk by credit risk rating categories (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://bnlengrg.com/role/ScheduleOfMaximumExposureToCreditRiskByCreditRiskRatingCategoriesDetails</Role>
      <ShortName>Schedule of maximum exposure to credit risk by credit risk rating categories (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>108</Position>
    </Report>
    <Report instance="form20-f.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R109.htm</HtmlFileName>
      <LongName>999115 - Disclosure - Schedule of credit risk profile of trade receivables on their past due status in terms (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://bnlengrg.com/role/ScheduleOfCreditRiskProfileOfTradeReceivablesOnTheirPastDueStatusInTermsDetails</Role>
      <ShortName>Schedule of credit risk profile of trade receivables on their past due status in terms (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>109</Position>
    </Report>
    <Report instance="form20-f.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R110.htm</HtmlFileName>
      <LongName>999116 - Disclosure - Schedule of financial instruments by remaining contractual maturities (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://bnlengrg.com/role/ScheduleOfFinancialInstrumentsByRemainingContractualMaturitiesDetails</Role>
      <ShortName>Schedule of financial instruments by remaining contractual maturities (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>110</Position>
    </Report>
    <Report instance="form20-f.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R111.htm</HtmlFileName>
      <LongName>999117 - Disclosure - Schedule of exposure to foreign currency risk (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://bnlengrg.com/role/ScheduleOfExposureToForeignCurrencyRiskDetails</Role>
      <ShortName>Schedule of exposure to foreign currency risk (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>111</Position>
    </Report>
    <Report instance="form20-f.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R112.htm</HtmlFileName>
      <LongName>999118 - Disclosure - Schedule of increase/(decrease) profit or loss that all other variables remain constant (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://bnlengrg.com/role/ScheduleOfIncreasedecreaseProfitOrLossThatAllOtherVariablesRemainConstantDetails</Role>
      <ShortName>Schedule of increase/(decrease) profit or loss that all other variables remain constant (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>112</Position>
    </Report>
    <Report instance="form20-f.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R113.htm</HtmlFileName>
      <LongName>999119 - Disclosure - Financial risk management (Details Narrative)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://bnlengrg.com/role/FinancialRiskManagementDetailsNarrative</Role>
      <ShortName>Financial risk management (Details Narrative)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <ParentRole>http://bnlengrg.com/role/FinancialRiskManagementTables</ParentRole>
      <Position>113</Position>
    </Report>
    <Report instance="form20-f.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R114.htm</HtmlFileName>
      <LongName>999120 - Disclosure -  Schedule of Financial Instruments Aggregate Carrying Amount (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://bnlengrg.com/role/ScheduleOfFinancialInstrumentsAggregateCarryingAmountDetails</Role>
      <ShortName> Schedule of Financial Instruments Aggregate Carrying Amount (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>114</Position>
    </Report>
    <Report instance="form20-f.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R115.htm</HtmlFileName>
      <LongName>999121 - Disclosure - Schedule of fair value of financial instrument carried at fair value (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://bnlengrg.com/role/ScheduleOfFairValueOfFinancialInstrumentCarriedAtFairValueDetails</Role>
      <ShortName>Schedule of fair value of financial instrument carried at fair value (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>115</Position>
    </Report>
    <Report instance="form20-f.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R116.htm</HtmlFileName>
      <LongName>999122 - Disclosure - Dividends paid (Details Narrative)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://bnlengrg.com/role/DividendsPaidDetailsNarrative</Role>
      <ShortName>Dividends paid (Details Narrative)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <ParentRole>http://bnlengrg.com/role/DividendsPaid</ParentRole>
      <Position>116</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="form20-f.htm">form20-f.htm</File>
    <File>magh-20260430.xsd</File>
    <File>magh-20260430_cal.xml</File>
    <File>magh-20260430_def.xml</File>
    <File>magh-20260430_lab.xml</File>
    <File>magh-20260430_pre.xml</File>
  </InputFiles>
  <SupplementalFiles>
    <File>form20-f_001.jpg</File>
    <File>form20-f_002.jpg</File>
    <File>form20-f_003.jpg</File>
    <File>form20-f_004.jpg</File>
    <File>form20-f_005.jpg</File>
  </SupplementalFiles>
  <BaseTaxonomies>
    <BaseTaxonomy items="9">http://fasb.org/srt/2025</BaseTaxonomy>
    <BaseTaxonomy items="6">http://xbrl.sec.gov/cyd/2025</BaseTaxonomy>
    <BaseTaxonomy items="46">http://xbrl.sec.gov/dei/2025</BaseTaxonomy>
    <BaseTaxonomy items="1">http://xbrl.sec.gov/ecd/2025</BaseTaxonomy>
    <BaseTaxonomy items="1264">https://xbrl.ifrs.org/taxonomy/2025-03-27/ifrs-full</BaseTaxonomy>
  </BaseTaxonomies>
  <HasPresentationLinkbase>true</HasPresentationLinkbase>
  <HasCalculationLinkbase>true</HasCalculationLinkbase>
</FilingSummary>
