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PROPERTY AND EQUIPMENT AND ASSET RETIREMENT OBLIGATION (Details) (USD $) | 12 Months Ended
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Sep. 30, 2014 | Sep. 30, 2013
Property and equipment |  |
Gross property and equipment | $ 223,023,000 us-gaap_PropertyPlantAndEquipmentGross | $ 252,872,000 us-gaap_PropertyPlantAndEquipmentGross
Accumulated depletion, depreciation, and amortization | (200,673,000)us-gaap_AccumulatedDepreciationDepletionAndAmortizationPropertyPlantAndEquipment | (211,566,000)us-gaap_AccumulatedDepreciationDepletionAndAmortizationPropertyPlantAndEquipment
Property and equipment, net | 22,350,000 us-gaap_PropertyPlantAndEquipmentNet | 41,306,000 us-gaap_PropertyPlantAndEquipmentNet
Change in the asset retirement obligation |  |
Balance at the beginning of the year | 7,520,000 us-gaap_AssetRetirementObligation | 5,629,000 us-gaap_AssetRetirementObligation
Obligations incurred on new wells drilled | 105,000 us-gaap_AssetRetirementObligationLiabilitiesIncurred | 61,000 us-gaap_AssetRetirementObligationLiabilitiesIncurred
Liabilities associated with properties sold | (718,000)brn_AssetRetirementObligationLiabilitiesDivested |
Revision of estimated obligation | 2,437,000 us-gaap_AssetRetirementObligationRevisionOfEstimate | 1,783,000 us-gaap_AssetRetirementObligationRevisionOfEstimate
Accretion expense | 624,000 us-gaap_AssetRetirementObligationAccretionExpense | 499,000 us-gaap_AssetRetirementObligationAccretionExpense
Payments | (111,000)us-gaap_AssetRetirementObligationLiabilitiesSettled | (222,000)us-gaap_AssetRetirementObligationLiabilitiesSettled
Foreign currency translation adjustment | (694,000)us-gaap_AssetRetirementObligationForeignCurrencyTranslation | (230,000)us-gaap_AssetRetirementObligationForeignCurrencyTranslation
Balance at the end of the year | 9,163,000 us-gaap_AssetRetirementObligation | 7,520,000 us-gaap_AssetRetirementObligation
Less current portion | (978,000)us-gaap_AssetRetirementObligationCurrent |
Asset retirement obligation, long-term | 8,185,000 us-gaap_AssetRetirementObligationsNoncurrent | 7,520,000 us-gaap_AssetRetirementObligationsNoncurrent
Land |  |
Property and equipment |  |
Gross property and equipment | 863,000 us-gaap_PropertyPlantAndEquipmentGross / us-gaap_PropertyPlantAndEquipmentByTypeAxis = us-gaap_LandMember | 863,000 us-gaap_PropertyPlantAndEquipmentGross / us-gaap_PropertyPlantAndEquipmentByTypeAxis = us-gaap_LandMember
Property and equipment, net | 863,000 us-gaap_PropertyPlantAndEquipmentNet / us-gaap_PropertyPlantAndEquipmentByTypeAxis = us-gaap_LandMember | 863,000 us-gaap_PropertyPlantAndEquipmentNet / us-gaap_PropertyPlantAndEquipmentByTypeAxis = us-gaap_LandMember
Oil and natural gas properties |  |
Property and equipment |  |
Gross property and equipment | 209,702,000 us-gaap_PropertyPlantAndEquipmentGross / us-gaap_PropertyPlantAndEquipmentByTypeAxis = us-gaap_OilAndGasPropertiesMember | 239,243,000 us-gaap_PropertyPlantAndEquipmentGross / us-gaap_PropertyPlantAndEquipmentByTypeAxis = us-gaap_OilAndGasPropertiesMember
Accumulated depletion, depreciation, and amortization | (191,478,000)us-gaap_AccumulatedDepreciationDepletionAndAmortizationPropertyPlantAndEquipment / us-gaap_PropertyPlantAndEquipmentByTypeAxis = us-gaap_OilAndGasPropertiesMember | (202,400,000)us-gaap_AccumulatedDepreciationDepletionAndAmortizationPropertyPlantAndEquipment / us-gaap_PropertyPlantAndEquipmentByTypeAxis = us-gaap_OilAndGasPropertiesMember
Property and equipment, net | 18,224,000 us-gaap_PropertyPlantAndEquipmentNet / us-gaap_PropertyPlantAndEquipmentByTypeAxis = us-gaap_OilAndGasPropertiesMember | 36,843,000 us-gaap_PropertyPlantAndEquipmentNet / us-gaap_PropertyPlantAndEquipmentByTypeAxis = us-gaap_OilAndGasPropertiesMember
Drilling rigs and equipment |  |
Property and equipment |  |
Gross property and equipment | 6,759,000 us-gaap_PropertyPlantAndEquipmentGross / us-gaap_PropertyPlantAndEquipmentByTypeAxis = brn_DrillingRigsAndEquipmentMember | 6,758,000 us-gaap_PropertyPlantAndEquipmentGross / us-gaap_PropertyPlantAndEquipmentByTypeAxis = brn_DrillingRigsAndEquipmentMember
Accumulated depletion, depreciation, and amortization | (5,754,000)us-gaap_AccumulatedDepreciationDepletionAndAmortizationPropertyPlantAndEquipment / us-gaap_PropertyPlantAndEquipmentByTypeAxis = brn_DrillingRigsAndEquipmentMember | (5,513,000)us-gaap_AccumulatedDepreciationDepletionAndAmortizationPropertyPlantAndEquipment / us-gaap_PropertyPlantAndEquipmentByTypeAxis = brn_DrillingRigsAndEquipmentMember
Property and equipment, net | 1,005,000 us-gaap_PropertyPlantAndEquipmentNet / us-gaap_PropertyPlantAndEquipmentByTypeAxis = brn_DrillingRigsAndEquipmentMember | 1,245,000 us-gaap_PropertyPlantAndEquipmentNet / us-gaap_PropertyPlantAndEquipmentByTypeAxis = brn_DrillingRigsAndEquipmentMember
Drilling rigs and equipment | Minimum |  |
Property and equipment |  |
Estimated useful lives | 3 years | 3 years
Drilling rigs and equipment | Maximum |  |
Property and equipment |  |
Estimated useful lives | 10 years | 10 years
Offices |  |
Property and equipment |  |
Estimated useful lives | 40 years | 40 years
Gross property and equipment | 2,420,000 us-gaap_PropertyPlantAndEquipmentGross / us-gaap_PropertyPlantAndEquipmentByTypeAxis = us-gaap_BuildingAndBuildingImprovementsMember | 2,420,000 us-gaap_PropertyPlantAndEquipmentGross / us-gaap_PropertyPlantAndEquipmentByTypeAxis = us-gaap_BuildingAndBuildingImprovementsMember
Accumulated depletion, depreciation, and amortization | (384,000)us-gaap_AccumulatedDepreciationDepletionAndAmortizationPropertyPlantAndEquipment / us-gaap_PropertyPlantAndEquipmentByTypeAxis = us-gaap_BuildingAndBuildingImprovementsMember | (324,000)us-gaap_AccumulatedDepreciationDepletionAndAmortizationPropertyPlantAndEquipment / us-gaap_PropertyPlantAndEquipmentByTypeAxis = us-gaap_BuildingAndBuildingImprovementsMember
Property and equipment, net | 2,036,000 us-gaap_PropertyPlantAndEquipmentNet / us-gaap_PropertyPlantAndEquipmentByTypeAxis = us-gaap_BuildingAndBuildingImprovementsMember | 2,096,000 us-gaap_PropertyPlantAndEquipmentNet / us-gaap_PropertyPlantAndEquipmentByTypeAxis = us-gaap_BuildingAndBuildingImprovementsMember
Other property and equipment |  |
Property and equipment |  |
Gross property and equipment | 3,279,000 us-gaap_PropertyPlantAndEquipmentGross / us-gaap_PropertyPlantAndEquipmentByTypeAxis = us-gaap_PropertyPlantAndEquipmentOtherTypesMember | 3,588,000 us-gaap_PropertyPlantAndEquipmentGross / us-gaap_PropertyPlantAndEquipmentByTypeAxis = us-gaap_PropertyPlantAndEquipmentOtherTypesMember
Accumulated depletion, depreciation, and amortization | (3,057,000)us-gaap_AccumulatedDepreciationDepletionAndAmortizationPropertyPlantAndEquipment / us-gaap_PropertyPlantAndEquipmentByTypeAxis = us-gaap_PropertyPlantAndEquipmentOtherTypesMember | (3,329,000)us-gaap_AccumulatedDepreciationDepletionAndAmortizationPropertyPlantAndEquipment / us-gaap_PropertyPlantAndEquipmentByTypeAxis = us-gaap_PropertyPlantAndEquipmentOtherTypesMember
Property and equipment, net | $ 222,000 us-gaap_PropertyPlantAndEquipmentNet / us-gaap_PropertyPlantAndEquipmentByTypeAxis = us-gaap_PropertyPlantAndEquipmentOtherTypesMember | $ 259,000 us-gaap_PropertyPlantAndEquipmentNet / us-gaap_PropertyPlantAndEquipmentByTypeAxis = us-gaap_PropertyPlantAndEquipmentOtherTypesMember
Other property and equipment | Minimum |  |
Property and equipment |  |
Estimated useful lives | 3 years | 3 years
Other property and equipment | Maximum |  |
Property and equipment |  |
Estimated useful lives | 17 years | 17 years

X
- Definition Amount of asset retirement obligations divested during the period. + References No definition available. + Details
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- Definition Amount of accumulated depreciation, depletion and amortization for physical assets used in the normal conduct of business to produce goods and services. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 360 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=6391035&loc=d3e2868-110229 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.14) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 14 -Article 5 + Details
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- Definition The carrying amount of a liability for an asset retirement obligation. An asset retirement obligation is a legal obligation associated with the disposal or retirement of a tangible long-lived asset that results from the acquisition, construction or development, or the normal operations of a long-lived asset, except for certain obligations of lessees. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 410 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=6392692&loc=d3e7535-110849 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Asset Retirement Obligation -URI http://asc.fasb.org/extlink&oid=6505190 + Details
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- Definition Amount of accretion expense recognized during the period that is associated with an asset retirement obligation. Accretion expense measures and incorporates changes due to the passage of time into the carrying amount of the liability. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 410 -SubTopic 20 -Section 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6392676&loc=d3e7480-110848 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 410 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (c)(3) -URI http://asc.fasb.org/extlink&oid=6392692&loc=d3e7535-110849 + Details
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- Definition Current portion of the carrying amount of a liability for an asset retirement obligation. An asset retirement obligation is a legal obligation associated with the disposal or retirement of a tangible long-lived asset that results from the acquisition, construction or development, or the normal operations of a long-lived asset, except for certain obligations of lessees. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 410 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=6392692&loc=d3e7535-110849 + Details
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- Definition Amount of the Increase or Decrease in the amount of asset retirement obligations for the period associated with foreign currency translation (to the extent that the entity accounts for the foreign currency effects as a separate component of the change in the liability). + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 410 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=6392692&loc=d3e7535-110849 + Details
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- Definition Amount of asset retirement obligations incurred during the period. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 410 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (c)(1) -URI http://asc.fasb.org/extlink&oid=6392692&loc=d3e7535-110849 + Details
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- Definition Amount of the Increase or Decrease in the amount of the asset retirement obligation during the current period for changes in the amount or timing of the estimated cash flows associated with the settlement of the obligation. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 410 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (c)(4) -URI http://asc.fasb.org/extlink&oid=6392692&loc=d3e7535-110849 + Details
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- Definition Noncurrent portion of the carrying amount of a liability for an asset retirement obligation. An asset retirement obligation is a legal obligation associated with the disposal or retirement of a tangible long-lived asset that results from the acquisition, construction or development, or the normal operations of a long-lived asset, except for certain obligations of lessees. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 410 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=6392692&loc=d3e7535-110849 + Details
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