CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS (USD $) In Thousands, unless otherwise specified	6 Months Ended
Mar. 31, 2015	Mar. 31, 2014
Cash flows from operating activities:
Net loss	$ (2,156)us-gaap_ProfitLoss	$ (1,324)us-gaap_ProfitLoss
Adjustments to reconcile net loss to net cash (used in) provided by operating activities:
Equity in (income) loss of affiliates	(456)	263
Depletion, depreciation, and amortization	1,847	4,068
Foreign exchange loss (gain)	146	(48)
Loss on sale of investment	16us-gaap_GainLossOnSaleOfInvestments	0us-gaap_GainLossOnSaleOfInvestments
Retirement benefits expense	204	182
Accretion of asset retirement obligation	308	238
Deferred income tax expense (benefit)	647us-gaap_DeferredIncomeTaxExpenseBenefit	(92)us-gaap_DeferredIncomeTaxExpenseBenefit
Asset retirement obligation payments	(489)	(70)
Share-based compensation benefit	(47)us-gaap_ShareBasedCompensation	(190)us-gaap_ShareBasedCompensation
Retirement plan contributions	(253)	(3)
Sale of interest in leasehold land, net	(1,849)brn_SaleOfInterestInLeaseholdLandNet	(120)brn_SaleOfInterestInLeaseholdLandNet
(Decrease) increase from changes in current assets and liabilities	(2,361)	106
Net cash (used in) provided by operating activities	(4,443)	3,010
Cash flows from investing activities:
Proceeds from sale of interest in leasehold land, net of fees paid	1,849	120
Proceeds from sale of investment, net of closing costs	266	0
Proceeds from sale of oil and natural gas assets	0	2,828
Proceeds from gas over bitumen royalty adjustments	0brn_ProceedsFromGasOverBitumenRoyalty	8brn_ProceedsFromGasOverBitumenRoyalty
Payment to acquire oil and natural gas properties	(526)	0
Payment to acquire interest in affiliates	0	(5,140)
Capital expenditures - oil and natural gas	(564)	(2,700)
Capital expenditures - all other	(75)	(38)
Net cash provided by (used in) investing activities	950	(4,922)
Cash flows from financing activities:
Proceeds from long-term debt borrowings	0	5,000
Repayments of long-term debt	(2,445)us-gaap_RepaymentsOfLongTermDebt	(1,770)us-gaap_RepaymentsOfLongTermDebt
Increase in restricted cash	0us-gaap_IncreaseInRestrictedCash	(1,947)us-gaap_IncreaseInRestrictedCash
Contributions from non-controlling interests	90	80
Distributions to non-controlling interests	(334)us-gaap_PaymentsToMinorityShareholders	0us-gaap_PaymentsToMinorityShareholders
Net cash (used in) provided by financing activities	(2,689)	1,363
Effect of exchange rate changes on cash and cash equivalents	(825)	(116)
Net decrease in cash and cash equivalents	(7,007)	(665)
Cash and cash equivalents at beginning of period	16,104	7,828
Cash and cash equivalents at end of period	$ 9,097	$ 7,163

This element represents cash inflow from gas over bitumen royalty adjustments during the reporting period.

No definition available.

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The cash inflow from the sale of interest in leasehold land, net of fees paid.

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Net revenue from the sale of interest in leasehold land.

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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.

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Amount of cash paid during the period to settle an asset retirement obligation. Amounts paid to settle an asset retirement obligation are generally included in the operating section of the Statement of Cash Flows.

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Amount of currency on hand as well as demand deposits with banks or financial institutions. Includes other kinds of accounts that have the general characteristics of demand deposits. Also includes short-term, highly liquid investments that are both readily convertible to known amounts of cash and so near their maturity that they present insignificant risk of changes in value because of changes in interest rates. Excludes cash and cash equivalents within disposal group and discontinued operation.

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Amount of deferred income tax expense (benefit) pertaining to income (loss) from continuing operations.

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The aggregate expense recognized in the current period that allocates the cost of tangible assets, intangible assets, or depleting assets to periods that benefit from use of the assets.

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The effect of exchange rate changes on cash balances in continuing operations held in foreign currencies.

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Amount before tax of foreign currency transaction realized and unrealized gain recognized in the income statement.

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The net realized gain (loss) on investments sold during the period, not including gains (losses) on securities separately or otherwise categorized as trading, available-for-sale, or held-to-maturity, which, for cash flow reporting, is a component of proceeds from investing activities.

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This item represents the entity's proportionate share for the period of the net income (loss) of its investee (such as unconsolidated subsidiaries and joint ventures) to which the equity method of accounting is applied. This item includes income or expense related to stock-based compensation based on the investor's grant of stock to employees of an equity method investee.

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The increase (decrease) during the reporting period of all assets and liabilities used in operating activities.

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Amount of cash outflow associated with funds that are not available for withdrawal or use (such as funds held in escrow) and are associated with underlying transactions that are classified as investing activities.

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The increase (decrease) in cash associated with the entity's continuing operating, investing, and financing activities. While for technical reasons this element has no balance attribute, the default assumption is a debit balance consistent with its label.

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Amount of cash inflow (outflow) from financing activities, including discontinued operations. Financing activity cash flows include obtaining resources from owners and providing them with a return on, and a return of, their investment; borrowing money and repaying amounts borrowed, or settling the obligation; and obtaining and paying for other resources obtained from creditors on long-term credit.

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Amount of cash inflow (outflow) from investing activities, including discontinued operations. Investing activity cash flows include making and collecting loans and acquiring and disposing of debt or equity instruments and property, plant, and equipment and other productive assets.

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Amount of cash inflow (outflow) from operating activities, including discontinued operations. Operating activity cash flows include transactions, adjustments, and changes in value not defined as investing or financing activities.

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The cash outflow associated with the purchase of or advances to an equity method investments, which are investments in joint ventures and entities in which the entity has an equity ownership interest normally of 20 to 50 percent and exercises significant influence.

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The cash outflow to purchase long lived physical asset for use in the normal oil and gas operations and to purchase mineral interests in oil and gas properties not intended for resale.

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The cash outflow for acquisition of or capital improvements on other tangible or intangible assets not otherwise defined in the taxonomy.

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The cash outflow for exploration and development of oil and gas properties. It includes cash payments related to development of oil and gas wells drilled at previously untested geologic structures (to determine the presence of oil or gas) and wells drilled at sites where the presence of oil or gas has already been established (to extract the oil or gas).

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Amount of cash outflow to a noncontrolling interest. Includes, but not limited to, reduction of noncontrolling interest ownership. Excludes dividends paid to the noncontrolling interest.

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The amount of cash or cash equivalents contributed during the reporting period by the entity to fund its pension plans and its non-pension postretirement benefit plans.

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The cash inflow from the sale of land held for investment; excludes sales of land held as inventory or productive use.

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