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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		$ 4,506,000us-gaap_AssetImpairmentCharges
Proceeds from sale of oil and natural gas properties	13,846,000us-gaap_ProceedsFromSaleOfOilAndGasPropertyAndEquipment
Gain (loss) recognized from property sales	0us-gaap_GainLossOnSaleOfOilAndGasProperty
Oil properties | Mantario area of Saskatchewan
Oil and natural gas properties
Purchase or sales price			2,726,000us-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				4,581,000us-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					6,120,000us-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	692,000us-gaap_SignificantAcquisitionsAndDisposalsAcquisitionCostsOrSaleProceeds / us-gaap_SignificantAcquisitionsAndDisposalsByTransactionAxis = brn_MiscellaneousOilAndNaturalGasPropertiesMember
Amount withheld in trust for the Canada Revenue Agency by the buyer	273,000brn_SignificantAcquisitionsAndDisposalsAmountWithheldInTrustForCanadaRevenueAgencyByBuyer / us-gaap_SignificantAcquisitionsAndDisposalsByTransactionAxis = brn_MiscellaneousOilAndNaturalGasPropertiesMember
Oil and natural gas properties
Oil and natural gas properties
Reduction of carrying value of assets	0us-gaap_AssetImpairmentCharges / us-gaap_PropertyPlantAndEquipmentByTypeAxis = us-gaap_OilAndGasPropertiesMember	4,506,000us-gaap_AssetImpairmentCharges / us-gaap_PropertyPlantAndEquipmentByTypeAxis = us-gaap_OilAndGasPropertiesMember
Proceeds from sale of oil and natural gas properties	$ 13,846,000us-gaap_ProceedsFromSaleOfOilAndGasPropertyAndEquipment / us-gaap_PropertyPlantAndEquipmentByTypeAxis = us-gaap_OilAndGasPropertiesMember

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Represents the amount withheld in the trust for the Canada Revenue Agency by the buyer.

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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



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-Publisher FASB

-Name Accounting Standards Codification

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-SubTopic 10

-Section 45

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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)

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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



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-Publisher FASB

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-Topic 230

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-Section 45

-Paragraph 12

-Subparagraph (c)

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The value of all consideration given or received by the Entity in the significant acquisition or disposal.

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