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COMMITMENTS AND CONTINGENCIES (Detail) (USD $)
3 Months Ended 6 Months Ended
Mar. 31, 2015
Mar. 31, 2015
Sep. 30, 2014
Commitments and Contingencies Disclosure [Abstract]      
Estimate of probable loss $ 2,300,000us-gaap_LossContingencyEstimateOfPossibleLoss $ 2,300,000us-gaap_LossContingencyEstimateOfPossibleLoss  
Percentage of working interest 58.00%brn_LossContingencyPercentageofWorkingInterest 58.00%brn_LossContingencyPercentageofWorkingInterest  
Accounts Receivable, Recoveries from Minority Working Interest 894,000brn_AccountsReceivableRecoveriesfromMinorityWorkingInterest 894,000brn_AccountsReceivableRecoveriesfromMinorityWorkingInterest  
Insurance deductible 80,000brn_LossContingencyInsuranceDeductible 80,000brn_LossContingencyInsuranceDeductible  
Estimated recovery from insurance 1,156,000us-gaap_LossContingencyReceivableCurrent 1,156,000us-gaap_LossContingencyReceivableCurrent  
Environmental Remediation Expense 160,000us-gaap_EnvironmentalRemediationExpense 160,000us-gaap_EnvironmentalRemediationExpense  
Loss contingency accrual 1,349,000us-gaap_LossContingencyAccrualCarryingValueCurrent 1,349,000us-gaap_LossContingencyAccrualCarryingValueCurrent  
Accrual for environmental remediation costs $ 401,000us-gaap_AccrualForEnvironmentalLossContingencies $ 401,000us-gaap_AccrualForEnvironmentalLossContingencies $ 501,000us-gaap_AccrualForEnvironmentalLossContingencies