3.8.0.1 html 529 408 1 false 134 0 false 14 false false R1.htm 0001000 - Document - Document Entity Information Document Sheet http://www.bxe.com/role/DocumentEntityInformationDocument Document Entity Information Document Cover 1 false false R2.htm 1001000 - Statement - BALANCE SHEETS Sheet http://www.bxe.com/role/BalanceSheets BALANCE SHEETS Statements 2 false false R3.htm 1002000 - Statement - STATEMENTS OF PROFIT (LOSS) AND COMPREHENSIVE INCOME (LOSS) Sheet http://www.bxe.com/role/StatementsOfProfitLossAndComprehensiveIncomeLoss STATEMENTS OF PROFIT (LOSS) AND COMPREHENSIVE INCOME (LOSS) Statements 3 false false R4.htm 1003000 - Statement - STATEMENTS OF SHAREHOLDERS' EQUITY Sheet http://www.bxe.com/role/StatementsOfShareholdersEquity STATEMENTS OF SHAREHOLDERS' EQUITY Statements 4 false false R5.htm 1004000 - Statement - STATEMENTS OF CASH FLOWS Sheet http://www.bxe.com/role/StatementsOfCashFlows STATEMENTS OF CASH FLOWS Statements 5 false false R6.htm 2101100 - Disclosure - CORPORATE INFORMATION Sheet http://www.bxe.com/role/CorporateInformation CORPORATE INFORMATION Notes 6 false false R7.htm 2104100 - Disclosure - BASIS OF PREPARATION Sheet http://www.bxe.com/role/BasisOfPreparation BASIS OF PREPARATION Notes 7 false false R8.htm 2107100 - Disclosure - SIGNIFICANT ACCOUNTING POLICIES Sheet http://www.bxe.com/role/SignificantAccountingPolicies SIGNIFICANT ACCOUNTING POLICIES Notes 8 false false R9.htm 2110100 - Disclosure - CRITICAL JUDGEMENTS AND ACCOUNTING ESTIMATES Sheet http://www.bxe.com/role/CriticalJudgementsAndAccountingEstimates CRITICAL JUDGEMENTS AND ACCOUNTING ESTIMATES Notes 9 false false R10.htm 2113100 - Disclosure - NEW STANDARDS AND INTERPRETATIONS NOT YET ADOPTED Sheet http://www.bxe.com/role/NewStandardsAndInterpretationsNotYetAdopted NEW STANDARDS AND INTERPRETATIONS NOT YET ADOPTED Notes 10 false false R11.htm 2116100 - Disclosure - EXPLORATION AND EVALUATION ASSETS Sheet http://www.bxe.com/role/ExplorationAndEvaluationAssets EXPLORATION AND EVALUATION ASSETS Notes 11 false false R12.htm 2119100 - Disclosure - PROPERTY, PLANT AND EQUIPMENT Sheet http://www.bxe.com/role/PropertyPlantAndEquipment PROPERTY, PLANT AND EQUIPMENT Notes 12 false false R13.htm 2122100 - Disclosure - DEBT Sheet http://www.bxe.com/role/Debt DEBT Notes 13 false false R14.htm 2125100 - Disclosure - DECOMMISSIONING LIABILITIES Sheet http://www.bxe.com/role/DecommissioningLiabilities DECOMMISSIONING LIABILITIES Notes 14 false false R15.htm 2128100 - Disclosure - OTHER DEFERRED LIABILITIES Sheet http://www.bxe.com/role/OtherDeferredLiabilities OTHER DEFERRED LIABILITIES Notes 15 false false R16.htm 2131100 - Disclosure - SHAREHOLDERS' CAPITAL Sheet http://www.bxe.com/role/ShareholdersCapital SHAREHOLDERS' CAPITAL Notes 16 false false R17.htm 2134100 - Disclosure - SHARE-BASED COMPENSATION PLANS Sheet http://www.bxe.com/role/ShareBasedCompensationPlans SHARE-BASED COMPENSATION PLANS Notes 17 false false R18.htm 2137100 - Disclosure - INCOME TAXES Sheet http://www.bxe.com/role/IncomeTaxes INCOME TAXES Notes 18 false false R19.htm 2140100 - Disclosure - FINANCE INCOME AND EXPENSES Sheet http://www.bxe.com/role/FinanceIncomeAndExpenses FINANCE INCOME AND EXPENSES Notes 19 false false R20.htm 2143100 - Disclosure - FOREIGN EXCHANGE Sheet http://www.bxe.com/role/ForeignExchange FOREIGN EXCHANGE Notes 20 false false R21.htm 2146100 - Disclosure - PER SHARE AMOUNTS Sheet http://www.bxe.com/role/PerShareAmounts PER SHARE AMOUNTS Notes 21 false false R22.htm 2149100 - Disclosure - FINANCIAL RISK MANAGEMENT Sheet http://www.bxe.com/role/FinancialRiskManagement FINANCIAL RISK MANAGEMENT Notes 22 false false R23.htm 2152100 - Disclosure - COMMITMENTS Sheet http://www.bxe.com/role/Commitments COMMITMENTS Notes 23 false false R24.htm 2155100 - Disclosure - RELATED PARTY TRANSACTIONS Sheet http://www.bxe.com/role/RelatedPartyTransactions RELATED PARTY TRANSACTIONS Notes 24 false false R25.htm 2158100 - Disclosure - SUPPLEMENTAL DISCLOSURES Sheet http://www.bxe.com/role/SupplementalDisclosures SUPPLEMENTAL DISCLOSURES Notes 25 false false R26.htm 2207201 - Disclosure - SIGNIFICANT ACCOUNTING POLICIES (Policies) Sheet http://www.bxe.com/role/SignificantAccountingPoliciesPolicies SIGNIFICANT ACCOUNTING POLICIES (Policies) Policies 26 false false R27.htm 2307302 - Disclosure - SIGNIFICANT ACCOUNTING POLICIES (Tables) Sheet http://www.bxe.com/role/SignificantAccountingPoliciesTables SIGNIFICANT ACCOUNTING POLICIES (Tables) Tables http://www.bxe.com/role/SignificantAccountingPolicies 27 false false R28.htm 2316301 - Disclosure - EXPLORATION AND EVALUATION ASSETS (Tables) Sheet http://www.bxe.com/role/ExplorationAndEvaluationAssetsTables EXPLORATION AND EVALUATION ASSETS (Tables) Tables http://www.bxe.com/role/ExplorationAndEvaluationAssets 28 false false R29.htm 2319301 - Disclosure - PROPERTY, PLANT AND EQUIPMENT (Tables) Sheet http://www.bxe.com/role/PropertyPlantAndEquipmentTables PROPERTY, PLANT AND EQUIPMENT (Tables) Tables http://www.bxe.com/role/PropertyPlantAndEquipment 29 false false R30.htm 2322301 - Disclosure - DEBT (Tables) Sheet http://www.bxe.com/role/DebtTables DEBT (Tables) Tables http://www.bxe.com/role/Debt 30 false false R31.htm 2325301 - Disclosure - DECOMMISSIONING LIABILITIES (Tables) Sheet http://www.bxe.com/role/DecommissioningLiabilitiesTables DECOMMISSIONING LIABILITIES (Tables) Tables http://www.bxe.com/role/DecommissioningLiabilities 31 false false R32.htm 2328301 - Disclosure - OTHER DEFERRED LIABILITIES (Tables) Sheet http://www.bxe.com/role/OtherDeferredLiabilitiesTables OTHER DEFERRED LIABILITIES (Tables) Tables http://www.bxe.com/role/OtherDeferredLiabilities 32 false false R33.htm 2331301 - Disclosure - SHAREHOLDERS' CAPITAL (Tables) Sheet http://www.bxe.com/role/ShareholdersCapitalTables SHAREHOLDERS' CAPITAL (Tables) Tables http://www.bxe.com/role/ShareholdersCapital 33 false false R34.htm 2334301 - Disclosure - SHARE-BASED COMPENSATION PLANS (Tables) Sheet http://www.bxe.com/role/ShareBasedCompensationPlansTables SHARE-BASED COMPENSATION PLANS (Tables) Tables http://www.bxe.com/role/ShareBasedCompensationPlans 34 false false R35.htm 2337301 - Disclosure - INCOME TAXES (Tables) Sheet http://www.bxe.com/role/IncomeTaxesTables INCOME TAXES (Tables) Tables http://www.bxe.com/role/IncomeTaxes 35 false false R36.htm 2340301 - Disclosure - FINANCE INCOME AND EXPENSES (Tables) Sheet http://www.bxe.com/role/FinanceIncomeAndExpensesTables FINANCE INCOME AND EXPENSES (Tables) Tables http://www.bxe.com/role/FinanceIncomeAndExpenses 36 false false R37.htm 2343301 - Disclosure - FOREIGN EXCHANGE (Tables) Sheet http://www.bxe.com/role/ForeignExchangeTables FOREIGN EXCHANGE (Tables) Tables http://www.bxe.com/role/ForeignExchange 37 false false R38.htm 2346301 - Disclosure - PER SHARE AMOUNTS (Tables) Sheet http://www.bxe.com/role/PerShareAmountsTables PER SHARE AMOUNTS (Tables) Tables http://www.bxe.com/role/PerShareAmounts 38 false false R39.htm 2349301 - Disclosure - FINANCIAL RISK MANAGEMENT (Tables) Sheet http://www.bxe.com/role/FinancialRiskManagementTables FINANCIAL RISK MANAGEMENT (Tables) Tables http://www.bxe.com/role/FinancialRiskManagement 39 false false R40.htm 2352301 - Disclosure - COMMITMENTS (Tables) Sheet http://www.bxe.com/role/CommitmentsTables COMMITMENTS (Tables) Tables http://www.bxe.com/role/Commitments 40 false false R41.htm 2355301 - Disclosure - RELATED PARTY TRANSACTIONS (Tables) Sheet http://www.bxe.com/role/RelatedPartyTransactionsTables RELATED PARTY TRANSACTIONS (Tables) Tables http://www.bxe.com/role/RelatedPartyTransactions 41 false false R42.htm 2358301 - Disclosure - SUPPLEMENTAL DISCLOSURES (Tables) Sheet http://www.bxe.com/role/SupplementalDisclosuresTables SUPPLEMENTAL DISCLOSURES (Tables) Tables http://www.bxe.com/role/SupplementalDisclosures 42 false false R43.htm 2407403 - Disclosure - SIGNIFICANT ACCOUNTING POLICIES - Property, Plant and Equipment and Exploration and Evaluation Assets (Details) Sheet http://www.bxe.com/role/SignificantAccountingPoliciesPropertyPlantAndEquipmentAndExplorationAndEvaluationAssetsDetails SIGNIFICANT ACCOUNTING POLICIES - Property, Plant and Equipment and Exploration and Evaluation Assets (Details) Details 43 false false R44.htm 2416402 - Disclosure - EXPLORATION AND EVALUATION ASSETS - Summary of Exploration and Evaluation Assets (Details) Sheet http://www.bxe.com/role/ExplorationAndEvaluationAssetsSummaryOfExplorationAndEvaluationAssetsDetails EXPLORATION AND EVALUATION ASSETS - Summary of Exploration and Evaluation Assets (Details) Details 44 false false R45.htm 2419402 - Disclosure - PROPERTY, PLANT AND EQUIPMENT - Summary of Property, Plant and Equipment (Details) Sheet http://www.bxe.com/role/PropertyPlantAndEquipmentSummaryOfPropertyPlantAndEquipmentDetails PROPERTY, PLANT AND EQUIPMENT - Summary of Property, Plant and Equipment (Details) Details 45 false false R46.htm 2419403 - Disclosure - PROPERTY, PLANT AND EQUIPMENT - Dispositions (Details) Sheet http://www.bxe.com/role/PropertyPlantAndEquipmentDispositionsDetails PROPERTY, PLANT AND EQUIPMENT - Dispositions (Details) Details 46 false false R47.htm 2419404 - Disclosure - PROPERTY, PLANT AND EQUIPMENT - Business Combinations (Details) Sheet http://www.bxe.com/role/PropertyPlantAndEquipmentBusinessCombinationsDetails PROPERTY, PLANT AND EQUIPMENT - Business Combinations (Details) Details 47 false false R48.htm 2419405 - Disclosure - PROPERTY, PLANT AND EQUIPMENT - Impairment Loss (Reversal) (Details) Sheet http://www.bxe.com/role/PropertyPlantAndEquipmentImpairmentLossReversalDetails PROPERTY, PLANT AND EQUIPMENT - Impairment Loss (Reversal) (Details) Details 48 false false R49.htm 2419406 - Disclosure - PROPERTY, PLANT AND EQUIPMENT - VIU Cash Generating Units (Details) Sheet http://www.bxe.com/role/PropertyPlantAndEquipmentViuCashGeneratingUnitsDetails PROPERTY, PLANT AND EQUIPMENT - VIU Cash Generating Units (Details) Details 49 false false R50.htm 2422402 - Disclosure - DEBT - Schedule of Debt (Details) Sheet http://www.bxe.com/role/DebtScheduleOfDebtDetails DEBT - Schedule of Debt (Details) Details 50 false false R51.htm 2422403 - Disclosure - DEBT - Narrative (Details) Sheet http://www.bxe.com/role/DebtNarrativeDetails DEBT - Narrative (Details) Details 51 false false R52.htm 2422404 - Disclosure - DEBT - Rollforward of Convertible Debentures (Details) Sheet http://www.bxe.com/role/DebtRollforwardOfConvertibleDebenturesDetails DEBT - Rollforward of Convertible Debentures (Details) Details 52 false false R53.htm 2422405 - Disclosure - DEBT - Rollforward of Senior Notes (Details) Notes http://www.bxe.com/role/DebtRollforwardOfSeniorNotesDetails DEBT - Rollforward of Senior Notes (Details) Details 53 false false R54.htm 2422406 - Disclosure - DEBT - Covenants (Details) Sheet http://www.bxe.com/role/DebtCovenantsDetails DEBT - Covenants (Details) Details 54 false false R55.htm 2425402 - Disclosure - DECOMMISSIONING LIABILITIES - Narrative (Details) Sheet http://www.bxe.com/role/DecommissioningLiabilitiesNarrativeDetails DECOMMISSIONING LIABILITIES - Narrative (Details) Details 55 false false R56.htm 2425403 - Disclosure - DECOMMISSIONING LIABILITIES - Rollforward of Decommissioning Liabilities (Details) Sheet http://www.bxe.com/role/DecommissioningLiabilitiesRollforwardOfDecommissioningLiabilitiesDetails DECOMMISSIONING LIABILITIES - Rollforward of Decommissioning Liabilities (Details) Details 56 false false R57.htm 2428402 - Disclosure - OTHER DEFERRED LIABILITIES - Summary of Other Liabilities (Details) Sheet http://www.bxe.com/role/OtherDeferredLiabilitiesSummaryOfOtherLiabilitiesDetails OTHER DEFERRED LIABILITIES - Summary of Other Liabilities (Details) Details 57 false false R58.htm 2428403 - Disclosure - OTHER DEFERRED LIABILITIES - Narrative (Details) Sheet http://www.bxe.com/role/OtherDeferredLiabilitiesNarrativeDetails OTHER DEFERRED LIABILITIES - Narrative (Details) Details 58 false false R59.htm 2428404 - Disclosure - OTHER DEFERRED LIABILITIES - Schedule of Future Minimum Lease Payments (Details) Sheet http://www.bxe.com/role/OtherDeferredLiabilitiesScheduleOfFutureMinimumLeasePaymentsDetails OTHER DEFERRED LIABILITIES - Schedule of Future Minimum Lease Payments (Details) Details 59 false false R60.htm 2431402 - Disclosure - SHAREHOLDERS' CAPITAL - Summary of Shareholders' Capital (Details) Sheet http://www.bxe.com/role/ShareholdersCapitalSummaryOfShareholdersCapitalDetails SHAREHOLDERS' CAPITAL - Summary of Shareholders' Capital (Details) Details 60 false false R61.htm 2434402 - Disclosure - SHARE-BASED COMPENSATION PLANS - Summary of Share-based Compensation Expense (Recovery) (Details) Sheet http://www.bxe.com/role/ShareBasedCompensationPlansSummaryOfShareBasedCompensationExpenseRecoveryDetails SHARE-BASED COMPENSATION PLANS - Summary of Share-based Compensation Expense (Recovery) (Details) Details 61 false false R62.htm 2434403 - Disclosure - SHARE-BASED COMPENSATION PLANS - Summary of Share Option Expense (Details) Sheet http://www.bxe.com/role/ShareBasedCompensationPlansSummaryOfShareOptionExpenseDetails SHARE-BASED COMPENSATION PLANS - Summary of Share Option Expense (Details) Details 62 false false R63.htm 2434404 - Disclosure - SHARE-BASED COMPENSATION PLANS - Summary of Company's Share-Based Compensation Liability Balance (Details) Sheet http://www.bxe.com/role/ShareBasedCompensationPlansSummaryOfCompanysShareBasedCompensationLiabilityBalanceDetails SHARE-BASED COMPENSATION PLANS - Summary of Company's Share-Based Compensation Liability Balance (Details) Details 63 false false R64.htm 2434405 - Disclosure - SHARE-BASED COMPENSATION PLANS - Options Fair Value Measurements (Details) Sheet http://www.bxe.com/role/ShareBasedCompensationPlansOptionsFairValueMeasurementsDetails SHARE-BASED COMPENSATION PLANS - Options Fair Value Measurements (Details) Details 64 false false R65.htm 2434406 - Disclosure - SHARE-BASED COMPENSATION PLANS - Options Roll Forward (Details) Sheet http://www.bxe.com/role/ShareBasedCompensationPlansOptionsRollForwardDetails SHARE-BASED COMPENSATION PLANS - Options Roll Forward (Details) Details 65 false false R66.htm 2434407 - Disclosure - SHARE-BASED COMPENSATION PLANS - Options Range of Exercise Price (Details) Sheet http://www.bxe.com/role/ShareBasedCompensationPlansOptionsRangeOfExercisePriceDetails SHARE-BASED COMPENSATION PLANS - Options Range of Exercise Price (Details) Details 66 false false R67.htm 2434408 - Disclosure - SHARE-BASED COMPENSATION PLANS - Deferred Share Unit Plan (Details) Sheet http://www.bxe.com/role/ShareBasedCompensationPlansDeferredShareUnitPlanDetails SHARE-BASED COMPENSATION PLANS - Deferred Share Unit Plan (Details) Details 67 false false R68.htm 2434409 - Disclosure - SHARE-BASED COMPENSATION PLANS - Award Plan (Details) Sheet http://www.bxe.com/role/ShareBasedCompensationPlansAwardPlanDetails SHARE-BASED COMPENSATION PLANS - Award Plan (Details) Details 68 false false R69.htm 2437402 - Disclosure - INCOME TAXES - Narrative (Details) Sheet http://www.bxe.com/role/IncomeTaxesNarrativeDetails INCOME TAXES - Narrative (Details) Details 69 false false R70.htm 2437403 - Disclosure - INCOME TAXES - Reconciliation of Expected and Actual Income Tax Expense (Recovery) (Details) Sheet http://www.bxe.com/role/IncomeTaxesReconciliationOfExpectedAndActualIncomeTaxExpenseRecoveryDetails INCOME TAXES - Reconciliation of Expected and Actual Income Tax Expense (Recovery) (Details) Details 70 false false R71.htm 2437404 - Disclosure - INCOME TAXES - Deferred Tax Liabilities and Assets (Details) Sheet http://www.bxe.com/role/IncomeTaxesDeferredTaxLiabilitiesAndAssetsDetails INCOME TAXES - Deferred Tax Liabilities and Assets (Details) Details 71 false false R72.htm 2437405 - Disclosure - INCOME TAXES - Continuity of Deferred Tax Asset (Liability) (Details) Sheet http://www.bxe.com/role/IncomeTaxesContinuityOfDeferredTaxAssetLiabilityDetails INCOME TAXES - Continuity of Deferred Tax Asset (Liability) (Details) Details 72 false false R73.htm 2440402 - Disclosure - FINANCE INCOME AND EXPENSES (Details) Sheet http://www.bxe.com/role/FinanceIncomeAndExpensesDetails FINANCE INCOME AND EXPENSES (Details) Details http://www.bxe.com/role/FinanceIncomeAndExpensesTables 73 false false R74.htm 2443402 - Disclosure - FOREIGN EXCHANGE - Detail of Gain (Loss) on Foreign Exchange (Details) Sheet http://www.bxe.com/role/ForeignExchangeDetailOfGainLossOnForeignExchangeDetails FOREIGN EXCHANGE - Detail of Gain (Loss) on Foreign Exchange (Details) Details 74 false false R75.htm 2443403 - Disclosure - FOREIGN EXCHANGE - Foreign Exchange Forward Contracts (Details) Sheet http://www.bxe.com/role/ForeignExchangeForeignExchangeForwardContractsDetails FOREIGN EXCHANGE - Foreign Exchange Forward Contracts (Details) Details 75 false false R76.htm 2446402 - Disclosure - PER SHARE AMOUNTS - Narrative (Details) Sheet http://www.bxe.com/role/PerShareAmountsNarrativeDetails PER SHARE AMOUNTS - Narrative (Details) Details 76 false false R77.htm 2446403 - Disclosure - PER SHARE AMOUNTS - Disclosure of Per Share Amounts (Details) Sheet http://www.bxe.com/role/PerShareAmountsDisclosureOfPerShareAmountsDetails PER SHARE AMOUNTS - Disclosure of Per Share Amounts (Details) Details 77 false false R78.htm 2449402 - Disclosure - FINANCIAL RISK MANAGEMENT - Capital Management (Details) Sheet http://www.bxe.com/role/FinancialRiskManagementCapitalManagementDetails FINANCIAL RISK MANAGEMENT - Capital Management (Details) Details 78 false false R79.htm 2449403 - Disclosure - FINANCIAL RISK MANAGEMENT - Credit Risk (Details) Sheet http://www.bxe.com/role/FinancialRiskManagementCreditRiskDetails FINANCIAL RISK MANAGEMENT - Credit Risk (Details) Details 79 false false R80.htm 2449404 - Disclosure - FINANCIAL RISK MANAGEMENT - Liquidity Risk, Narrative (Details) Sheet http://www.bxe.com/role/FinancialRiskManagementLiquidityRiskNarrativeDetails FINANCIAL RISK MANAGEMENT - Liquidity Risk, Narrative (Details) Details 80 false false R81.htm 2449405 - Disclosure - FINANCIAL RISK MANAGEMENT - Liquidity Risk (Details) Sheet http://www.bxe.com/role/FinancialRiskManagementLiquidityRiskDetails FINANCIAL RISK MANAGEMENT - Liquidity Risk (Details) Details 81 false false R82.htm 2449406 - Disclosure - FINANCIAL RISK MANAGEMENT - Foreign Exchange Risk (Details) Sheet http://www.bxe.com/role/FinancialRiskManagementForeignExchangeRiskDetails FINANCIAL RISK MANAGEMENT - Foreign Exchange Risk (Details) Details 82 false false R83.htm 2449407 - Disclosure - FINANCIAL RISK MANAGEMENT - Commodity Price Risk (Details) Sheet http://www.bxe.com/role/FinancialRiskManagementCommodityPriceRiskDetails FINANCIAL RISK MANAGEMENT - Commodity Price Risk (Details) Details 83 false false R84.htm 2449408 - Disclosure - FINANCIAL RISK MANAGEMENT - Interest Rate Risk (Details) Sheet http://www.bxe.com/role/FinancialRiskManagementInterestRateRiskDetails FINANCIAL RISK MANAGEMENT - Interest Rate Risk (Details) Details 84 false false R85.htm 2449409 - Disclosure - FINANCIAL RISK MANAGEMENT - Fair Value Hierachy Levels (Details) Sheet http://www.bxe.com/role/FinancialRiskManagementFairValueHierachyLevelsDetails FINANCIAL RISK MANAGEMENT - Fair Value Hierachy Levels (Details) Details 85 false false R86.htm 2449410 - Disclosure - FINANCIAL RISK MANAGEMENT - Fair Value (Details) Sheet http://www.bxe.com/role/FinancialRiskManagementFairValueDetails FINANCIAL RISK MANAGEMENT - Fair Value (Details) Details 86 false false R87.htm 2452402 - Disclosure - COMMITMENTS - Summary of Operating Lease Maturities (Details) Sheet http://www.bxe.com/role/CommitmentsSummaryOfOperatingLeaseMaturitiesDetails COMMITMENTS - Summary of Operating Lease Maturities (Details) Details 87 false false R88.htm 2455402 - Disclosure - RELATED PARTY TRANSACTIONS (Details) Sheet http://www.bxe.com/role/RelatedPartyTransactionsDetails RELATED PARTY TRANSACTIONS (Details) Details http://www.bxe.com/role/RelatedPartyTransactionsTables 88 false false R89.htm 2458402 - Disclosure - SUPPLEMENTAL DISCLOSURES - Changes in Non-cash Working Capital (Details) Sheet http://www.bxe.com/role/SupplementalDisclosuresChangesInNonCashWorkingCapitalDetails SUPPLEMENTAL DISCLOSURES - Changes in Non-cash Working Capital (Details) Details 89 false false R90.htm 2458403 - Disclosure - SUPPLEMENTAL DISCLOSURES - Consolidated Statement of Comprehensive Income (Loss) Presentation (Details) Sheet http://www.bxe.com/role/SupplementalDisclosuresConsolidatedStatementOfComprehensiveIncomeLossPresentationDetails SUPPLEMENTAL DISCLOSURES - Consolidated Statement of Comprehensive Income (Loss) Presentation (Details) Details 90 false false All Reports Book All Reports bxe-20171231.xml bxe-20171231.xsd bxe-20171231_cal.xml bxe-20171231_def.xml bxe-20171231_lab.xml bxe-20171231_pre.xml http://xbrl.ifrs.org/taxonomy/2017-03-09/ifrs-full http://xbrl.sec.gov/dei/2014-01-31 http://xbrl.sec.gov/invest/2013-01-31 true true