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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 |
--- | --- | ---
Dec. 31, 2014 | Dec. 31, 2013 | Sep. 30, 2013 MMBTU
Derivative [Line Items] |  |  |
Document Period End Date | Dec. 31, 2014 |  |
Derivative, Percentage of Production Volume Covered by Derivative Financial Instruments | 71.00%hrg_DerivativePercentageOfProductionVolumeCoveredByDerivativeFinancialInstruments | 84.00%hrg_DerivativePercentageOfProductionVolumeCoveredByDerivativeFinancialInstruments |
Swap [Member] | Natural Gas Commodity Contract [Member] |  |  |
Derivative [Line Items] |  |  |
Natural Gas, Volume |  |  | 6,821.0 hrg_DerivativeCommodityContractEnergyVolume / us-gaap_DerivativeByNatureAxis = us-gaap_SwapMember / us-gaap_DerivativeInstrumentRiskAxis = hrg_NaturalGasCommodityContractMember
Swap [Member] | Natural Gas Commodity Contract [Member] | Year Two [Member] |  |  |
Derivative [Line Items] |  |  |
Natural Gas, Volume | 10,950,000.0 hrg_DerivativeCommodityContractEnergyVolume / us-gaap_DerivativeByNatureAxis = us-gaap_SwapMember / us-gaap_DerivativeInstrumentRiskAxis = hrg_NaturalGasCommodityContractMember / hrg_DerivativePeriodAxis = hrg_YearTwoMember |  |
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_YearTwoMember |  |
Fair Value at December 31, 2014 | 10.0 us-gaap_DerivativeFairValueOfDerivativeNet / us-gaap_DerivativeByNatureAxis = us-gaap_SwapMember / us-gaap_DerivativeInstrumentRiskAxis = hrg_NaturalGasCommodityContractMember / hrg_DerivativePeriodAxis = hrg_YearTwoMember |  |
Swap [Member] | Oil Commodity Contract [Member] |  |  |
Derivative [Line Items] |  |  |
Derivative, Commodity Contract, Oil Volume |  |  | 254,366.0 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 |  |
Fair Value at December 31, 2014 | 9.5 us-gaap_DerivativeFairValueOfDerivativeNet / us-gaap_DerivativeByNatureAxis = us-gaap_SwapMember / us-gaap_DerivativeInstrumentRiskAxis = hrg_OilCommodityContractMember / hrg_DerivativePeriodAxis = hrg_YearTwoMember |  |
Derivative, Commodity Contract, Oil Volume | 250,000.0 hrg_DerivativeCommodityContractOilVolume / us-gaap_DerivativeByNatureAxis = us-gaap_SwapMember / us-gaap_DerivativeInstrumentRiskAxis = hrg_OilCommodityContractMember / hrg_DerivativePeriodAxis = hrg_YearTwoMember |  |
Swap [Member] | Energy Related Derivative [Member] |  |  |
Derivative [Line Items] |  |  |
Fair Value at December 31, 2014 | 19.5 us-gaap_DerivativeFairValueOfDerivativeNet / us-gaap_DerivativeByNatureAxis = us-gaap_SwapMember / us-gaap_DerivativeInstrumentRiskAxis = us-gaap_EnergyRelatedDerivativeMember |  |

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