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OIL AND NATURAL GAS PROPERTIES (Details) (USD $) | 12 Months Ended |  |  |
--- | --- | --- | --- | ---
Sep. 30, 2014 | Sep. 30, 2013 | Feb. 28, 2014 | Apr. 30, 2014 | May 31, 2014
Oil and natural gas properties |  |  |  |  |
Reduction of carrying value of assets |  | $ 4,506,000 us-gaap_AssetImpairmentCharges |  |  |
Proceeds from sale of oil and natural gas properties | 13,846,000 us-gaap_ProceedsFromSaleOfOilAndGasPropertyAndEquipment |  |  |  |
Gain (loss) recognized from property sales | 0 us-gaap_GainLossOnSaleOfOilAndGasProperty |  |  |  |
Oil properties | Mantario area of Saskatchewan |  |  |  |  |
Oil and natural gas properties |  |  |  |  |
Purchase or sales price |  |  | 2,726,000 us-gaap_SignificantAcquisitionsAndDisposalsAcquisitionCostsOrSaleProceeds / us-gaap_SignificantAcquisitionsAndDisposalsByTransactionAxis = brn_OilLeaseholdsMember / us-gaap_StatementGeographicalAxis = brn_MantarioMember |  |
Oil and gas properties | Chauvin, Cessford and Rat Creek areas of Alberta |  |  |  |  |
Oil and natural gas properties |  |  |  |  |
Purchase or sales price |  |  |  | 4,581,000 us-gaap_SignificantAcquisitionsAndDisposalsAcquisitionCostsOrSaleProceeds / us-gaap_SignificantAcquisitionsAndDisposalsByTransactionAxis = brn_OilAndGasLeaseholdPropertiesMember / us-gaap_StatementGeographicalAxis = brn_ChauvinCessfordAndRatCreekAreasOfAlbertaMember |
Oil and gas properties | Boundary Lake area of Alberta and British Columbia |  |  |  |  |
Oil and natural gas properties |  |  |  |  |
Purchase or sales price |  |  |  |  | 6,120,000 us-gaap_SignificantAcquisitionsAndDisposalsAcquisitionCostsOrSaleProceeds / us-gaap_SignificantAcquisitionsAndDisposalsByTransactionAxis = brn_OilAndGasLeaseholdPropertiesMember / us-gaap_StatementGeographicalAxis = brn_BoundaryLakeAreaOfAlbertaAndBritishColumbiaMember
Miscellaneous oil and natural gas properties |  |  |  |  |
Oil and natural gas properties |  |  |  |  |
Purchase or sales price | 692,000 us-gaap_SignificantAcquisitionsAndDisposalsAcquisitionCostsOrSaleProceeds / us-gaap_SignificantAcquisitionsAndDisposalsByTransactionAxis = brn_MiscellaneousOilAndNaturalGasPropertiesMember |  |  |  |
Amount withheld in trust for the Canada Revenue Agency by the buyer | 273,000 brn_SignificantAcquisitionsAndDisposalsAmountWithheldInTrustForCanadaRevenueAgencyByBuyer / us-gaap_SignificantAcquisitionsAndDisposalsByTransactionAxis = brn_MiscellaneousOilAndNaturalGasPropertiesMember |  |  |  |
Oil and natural gas properties |  |  |  |  |
Oil and natural gas properties |  |  |  |  |
Reduction of carrying value of assets | 0 us-gaap_AssetImpairmentCharges / us-gaap_PropertyPlantAndEquipmentByTypeAxis = us-gaap_OilAndGasPropertiesMember | 4,506,000 us-gaap_AssetImpairmentCharges / us-gaap_PropertyPlantAndEquipmentByTypeAxis = us-gaap_OilAndGasPropertiesMember |  |  |
Proceeds from sale of oil and natural gas properties | $ 13,846,000 us-gaap_ProceedsFromSaleOfOilAndGasPropertyAndEquipment / us-gaap_PropertyPlantAndEquipmentByTypeAxis = us-gaap_OilAndGasPropertiesMember |  |  |  |

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- Definition Amount of write-down of assets recognized in the income statement. Includes, but is not limited to, losses from tangible assets, intangible assets and goodwill. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3602-108585 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 360 -SubTopic 10 -Section 45 -Paragraph 4 -URI http://asc.fasb.org/extlink&oid=8077374&loc=d3e2420-110228 + Details
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- Definition Amount of gain (loss) on sale or disposal of proven and unproven oil and gas properties. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3602-108585 + Details
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- Definition The cash inflow to dispose of long-lived, physical assets and mineral interests in oil and gas properties used for normal oil and gas operations. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Investing Activities -URI http://asc.fasb.org/extlink&oid=6516133 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 12 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3179-108585 + Details
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