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Derivative Financial Instruments Derivative Financial Instruments - Oil and Gas Commodity Contracts (Details) (USD $) In Millions, unless otherwise specified | 3 Months Ended | 6 Months Ended |
--- | --- | --- | ---
Mar. 31, 2015 | Mar. 31, 2014 | Mar. 31, 2015 | Mar. 31, 2014 | Sep. 30, 2014 MMBTU
Derivative [Line Items] |  |  |  |  |
Derivative, Percentage of Production Volume Covered by Derivative Financial Instruments | 38.00%hrg_DerivativePercentageOfProductionVolumeCoveredByDerivativeFinancialInstruments | 69.00%hrg_DerivativePercentageOfProductionVolumeCoveredByDerivativeFinancialInstruments | 55.00%hrg_DerivativePercentageOfProductionVolumeCoveredByDerivativeFinancialInstruments | 0.00%hrg_DerivativePercentageOfProductionVolumeCoveredByDerivativeFinancialInstruments |
Swap [Member] | Natural Gas Commodity Contract [Member] |  |  |  |  |
Derivative [Line Items] |  |  |  |  |
Natural Gas, Volume | 12,530,000 hrg_DerivativeCommodityContractEnergyVolume / us-gaap_DerivativeByNatureAxis = us-gaap_SwapMember / us-gaap_DerivativeInstrumentRiskAxis = hrg_NaturalGasCommodityContractMember |  | 12,530,000 hrg_DerivativeCommodityContractEnergyVolume / us-gaap_DerivativeByNatureAxis = us-gaap_SwapMember / us-gaap_DerivativeInstrumentRiskAxis = hrg_NaturalGasCommodityContractMember |  | 6,821,000 hrg_DerivativeCommodityContractEnergyVolume / us-gaap_DerivativeByNatureAxis = us-gaap_SwapMember / us-gaap_DerivativeInstrumentRiskAxis = hrg_NaturalGasCommodityContractMember
Fair Value at March 31, 2015 | 10.4 us-gaap_DerivativeFairValueOfDerivativeNet / us-gaap_DerivativeByNatureAxis = us-gaap_SwapMember / us-gaap_DerivativeInstrumentRiskAxis = hrg_NaturalGasCommodityContractMember |  | 10.4 us-gaap_DerivativeFairValueOfDerivativeNet / us-gaap_DerivativeByNatureAxis = us-gaap_SwapMember / us-gaap_DerivativeInstrumentRiskAxis = hrg_NaturalGasCommodityContractMember |  |
Swap [Member] | Natural Gas Commodity Contract [Member] | Remainder of 2014 [Member] |  |  |  |  |
Derivative [Line Items] |  |  |  |  |
Natural Gas, Volume | 8,250,000 hrg_DerivativeCommodityContractEnergyVolume / us-gaap_DerivativeByNatureAxis = us-gaap_SwapMember / us-gaap_DerivativeInstrumentRiskAxis = hrg_NaturalGasCommodityContractMember / hrg_DerivativePeriodAxis = hrg_RemainderOfYearOneMember |  | 8,250,000 hrg_DerivativeCommodityContractEnergyVolume / us-gaap_DerivativeByNatureAxis = us-gaap_SwapMember / us-gaap_DerivativeInstrumentRiskAxis = hrg_NaturalGasCommodityContractMember / hrg_DerivativePeriodAxis = hrg_RemainderOfYearOneMember |  |
Weighted average strike price per Mmbtu/Bbl | 3.95 hrg_DerivativeSwapTypeAverageStrikePrice / us-gaap_DerivativeByNatureAxis = us-gaap_SwapMember / us-gaap_DerivativeInstrumentRiskAxis = hrg_NaturalGasCommodityContractMember / hrg_DerivativePeriodAxis = hrg_RemainderOfYearOneMember |  | 3.95 hrg_DerivativeSwapTypeAverageStrikePrice / us-gaap_DerivativeByNatureAxis = us-gaap_SwapMember / us-gaap_DerivativeInstrumentRiskAxis = hrg_NaturalGasCommodityContractMember / hrg_DerivativePeriodAxis = hrg_RemainderOfYearOneMember |  |
Fair Value at March 31, 2015 | 9.6 us-gaap_DerivativeFairValueOfDerivativeNet / us-gaap_DerivativeByNatureAxis = us-gaap_SwapMember / us-gaap_DerivativeInstrumentRiskAxis = hrg_NaturalGasCommodityContractMember / hrg_DerivativePeriodAxis = hrg_RemainderOfYearOneMember |  | 9.6 us-gaap_DerivativeFairValueOfDerivativeNet / us-gaap_DerivativeByNatureAxis = us-gaap_SwapMember / us-gaap_DerivativeInstrumentRiskAxis = hrg_NaturalGasCommodityContractMember / hrg_DerivativePeriodAxis = hrg_RemainderOfYearOneMember |  |
Swap [Member] | Oil Commodity Contract [Member] |  |  |  |  |
Derivative [Line Items] |  |  |  |  |
Fair Value at March 31, 2015 | 8.9 us-gaap_DerivativeFairValueOfDerivativeNet / us-gaap_DerivativeByNatureAxis = us-gaap_SwapMember / us-gaap_DerivativeInstrumentRiskAxis = hrg_OilCommodityContractMember |  | 8.9 us-gaap_DerivativeFairValueOfDerivativeNet / us-gaap_DerivativeByNatureAxis = us-gaap_SwapMember / us-gaap_DerivativeInstrumentRiskAxis = hrg_OilCommodityContractMember |  |
Derivative, Commodity Contract, Oil Volume | 188,000 hrg_DerivativeCommodityContractOilVolume / us-gaap_DerivativeByNatureAxis = us-gaap_SwapMember / us-gaap_DerivativeInstrumentRiskAxis = hrg_OilCommodityContractMember |  | 188,000 hrg_DerivativeCommodityContractOilVolume / us-gaap_DerivativeByNatureAxis = us-gaap_SwapMember / us-gaap_DerivativeInstrumentRiskAxis = hrg_OilCommodityContractMember |  | 254,000 hrg_DerivativeCommodityContractOilVolume / us-gaap_DerivativeByNatureAxis = us-gaap_SwapMember / us-gaap_DerivativeInstrumentRiskAxis = hrg_OilCommodityContractMember
Swap [Member] | Oil Commodity Contract [Member] | Year Two [Member] |  |  |  |  |
Derivative [Line Items] |  |  |  |  |
Weighted average strike price per Mmbtu/Bbl | 94.98 hrg_DerivativeSwapTypeAverageStrikePrice / us-gaap_DerivativeByNatureAxis = us-gaap_SwapMember / us-gaap_DerivativeInstrumentRiskAxis = hrg_OilCommodityContractMember / hrg_DerivativePeriodAxis = hrg_YearTwoMember |  | 94.98 hrg_DerivativeSwapTypeAverageStrikePrice / us-gaap_DerivativeByNatureAxis = us-gaap_SwapMember / us-gaap_DerivativeInstrumentRiskAxis = hrg_OilCommodityContractMember / hrg_DerivativePeriodAxis = hrg_YearTwoMember |  |
Fair Value at March 31, 2015 | 8.9 us-gaap_DerivativeFairValueOfDerivativeNet / us-gaap_DerivativeByNatureAxis = us-gaap_SwapMember / us-gaap_DerivativeInstrumentRiskAxis = hrg_OilCommodityContractMember / hrg_DerivativePeriodAxis = hrg_YearTwoMember |  | 8.9 us-gaap_DerivativeFairValueOfDerivativeNet / us-gaap_DerivativeByNatureAxis = us-gaap_SwapMember / us-gaap_DerivativeInstrumentRiskAxis = hrg_OilCommodityContractMember / hrg_DerivativePeriodAxis = hrg_YearTwoMember |  |
Swap [Member] | Oil Commodity Contract [Member] | Remainder of 2014 [Member] |  |  |  |  |
Derivative [Line Items] |  |  |  |  |
Derivative, Commodity Contract, Oil Volume | 188,000 hrg_DerivativeCommodityContractOilVolume / us-gaap_DerivativeByNatureAxis = us-gaap_SwapMember / us-gaap_DerivativeInstrumentRiskAxis = hrg_OilCommodityContractMember / hrg_DerivativePeriodAxis = hrg_RemainderOfYearOneMember |  | 188,000 hrg_DerivativeCommodityContractOilVolume / us-gaap_DerivativeByNatureAxis = us-gaap_SwapMember / us-gaap_DerivativeInstrumentRiskAxis = hrg_OilCommodityContractMember / hrg_DerivativePeriodAxis = hrg_RemainderOfYearOneMember |  |
Swap [Member] | Energy Related Derivative [Member] |  |  |  |  |
Derivative [Line Items] |  |  |  |  |
Fair Value at March 31, 2015 | 19.3 us-gaap_DerivativeFairValueOfDerivativeNet / us-gaap_DerivativeByNatureAxis = us-gaap_SwapMember / us-gaap_DerivativeInstrumentRiskAxis = us-gaap_EnergyRelatedDerivativeMember |  | 19.3 us-gaap_DerivativeFairValueOfDerivativeNet / us-gaap_DerivativeByNatureAxis = us-gaap_SwapMember / us-gaap_DerivativeInstrumentRiskAxis = us-gaap_EnergyRelatedDerivativeMember |  |
Commodity Option [Member] | Natural Gas Commodity Contract [Member] | Remainder of 2014 [Member] |  |  |  |  |
Derivative [Line Items] |  |  |  |  |
Natural Gas, Volume | 4,280,000 hrg_DerivativeCommodityContractEnergyVolume / us-gaap_DerivativeByNatureAxis = us-gaap_CommodityOptionMember / us-gaap_DerivativeInstrumentRiskAxis = hrg_NaturalGasCommodityContractMember / hrg_DerivativePeriodAxis = hrg_RemainderOfYearOneMember |  | 4,280,000 hrg_DerivativeCommodityContractEnergyVolume / us-gaap_DerivativeByNatureAxis = us-gaap_CommodityOptionMember / us-gaap_DerivativeInstrumentRiskAxis = hrg_NaturalGasCommodityContractMember / hrg_DerivativePeriodAxis = hrg_RemainderOfYearOneMember |  |
Fair Value at March 31, 2015 | 0.8 us-gaap_DerivativeFairValueOfDerivativeNet / us-gaap_DerivativeByNatureAxis = us-gaap_CommodityOptionMember / us-gaap_DerivativeInstrumentRiskAxis = hrg_NaturalGasCommodityContractMember / hrg_DerivativePeriodAxis = hrg_RemainderOfYearOneMember |  | 0.8 us-gaap_DerivativeFairValueOfDerivativeNet / us-gaap_DerivativeByNatureAxis = us-gaap_CommodityOptionMember / us-gaap_DerivativeInstrumentRiskAxis = hrg_NaturalGasCommodityContractMember / hrg_DerivativePeriodAxis = hrg_RemainderOfYearOneMember |  |
Commodity Option [Member] | Natural Gas Commodity Contract- Short put [Member] | Remainder of 2014 [Member] |  |  |  |  |
Derivative [Line Items] |  |  |  |  |
Weighted average strike price per Mmbtu/Bbl | 2.10 hrg_DerivativeSwapTypeAverageStrikePrice / us-gaap_DerivativeByNatureAxis = us-gaap_CommodityOptionMember / us-gaap_DerivativeInstrumentRiskAxis = hrg_NaturalGasCommodityContractShortputMember / hrg_DerivativePeriodAxis = hrg_RemainderOfYearOneMember |  | 2.10 hrg_DerivativeSwapTypeAverageStrikePrice / us-gaap_DerivativeByNatureAxis = us-gaap_CommodityOptionMember / us-gaap_DerivativeInstrumentRiskAxis = hrg_NaturalGasCommodityContractShortputMember / hrg_DerivativePeriodAxis = hrg_RemainderOfYearOneMember |  |
Commodity Option [Member] | Natural Gas Commodity Option Contract- Short call [Member] [Member] | Remainder of 2014 [Member] |  |  |  |  |
Derivative [Line Items] |  |  |  |  |
Weighted average strike price per Mmbtu/Bbl | 3.27 hrg_DerivativeSwapTypeAverageStrikePrice / us-gaap_DerivativeByNatureAxis = us-gaap_CommodityOptionMember / us-gaap_DerivativeInstrumentRiskAxis = hrg_NaturalGasCommodityOptionContractShortcallMemberMember / hrg_DerivativePeriodAxis = hrg_RemainderOfYearOneMember |  | 3.27 hrg_DerivativeSwapTypeAverageStrikePrice / us-gaap_DerivativeByNatureAxis = us-gaap_CommodityOptionMember / us-gaap_DerivativeInstrumentRiskAxis = hrg_NaturalGasCommodityOptionContractShortcallMemberMember / hrg_DerivativePeriodAxis = hrg_RemainderOfYearOneMember |  |
Commodity Option [Member] | Natural Gas Commodity Commodity Contract- Long put [Member] | Remainder of 2014 [Member] |  |  |  |  |
Derivative [Line Items] |  |  |  |  |
Weighted average strike price per Mmbtu/Bbl | 2.85 hrg_DerivativeSwapTypeAverageStrikePrice / us-gaap_DerivativeByNatureAxis = us-gaap_CommodityOptionMember / us-gaap_DerivativeInstrumentRiskAxis = hrg_NaturalGasCommodityCommodityContractLongputMember / hrg_DerivativePeriodAxis = hrg_RemainderOfYearOneMember |  | 2.85 hrg_DerivativeSwapTypeAverageStrikePrice / us-gaap_DerivativeByNatureAxis = us-gaap_CommodityOptionMember / us-gaap_DerivativeInstrumentRiskAxis = hrg_NaturalGasCommodityCommodityContractLongputMember / hrg_DerivativePeriodAxis = hrg_RemainderOfYearOneMember |  |

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- Definition Derivative, Commodity Contract, Natural Gas Volume + References No definition available. + Details
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- Definition Derivative, Commodity Contract, Oil Volume + References No definition available. + Details
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- Definition Derivative, Percentage of Production Volume Covered by Derivative Financial Instruments + References No definition available. + Details
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- Definition Derivative, Swap Type, Average Strike Price + References No definition available. + Details
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- Definition Fair value of the assets less the liabilities of a derivative or group of derivatives. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 825 -SubTopic 10 -Section 50 -Paragraph 10 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=49121117&loc=d3e13433-108611 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 45 -Paragraph 5 -URI http://asc.fasb.org/extlink&oid=6945355&loc=d3e41228-113958 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 825 -SubTopic 10 -Section 50 -Paragraph 15 -URI http://asc.fasb.org/extlink&oid=49121117&loc=d3e13495-108611 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 45 -Paragraph 6 -URI http://asc.fasb.org/extlink&oid=6945355&loc=d3e41271-113958 + Details
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Balance Type: | debit
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- Details
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Data Type: | xbrli:stringItemType
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- Details
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Namespace Prefix: |
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Balance Type: |
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- Details
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Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |