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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			6,821.0hrg_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	10,950,000.0hrg_DerivativeCommodityContractEnergyVolume / us-gaap_DerivativeByNatureAxis = us-gaap_SwapMember / us-gaap_DerivativeInstrumentRiskAxis = hrg_NaturalGasCommodityContractMember / hrg_DerivativePeriodAxis = hrg_YearTwoMember
Weighted average strike price per Mmbtu/Bbl	3.95hrg_DerivativeSwapTypeAverageStrikePrice / us-gaap_DerivativeByNatureAxis = us-gaap_SwapMember / us-gaap_DerivativeInstrumentRiskAxis = hrg_NaturalGasCommodityContractMember / hrg_DerivativePeriodAxis = hrg_YearTwoMember
Fair Value at December 31, 2014	10.0us-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			254,366.0hrg_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	94.98hrg_DerivativeSwapTypeAverageStrikePrice / us-gaap_DerivativeByNatureAxis = us-gaap_SwapMember / us-gaap_DerivativeInstrumentRiskAxis = hrg_OilCommodityContractMember / hrg_DerivativePeriodAxis = hrg_YearTwoMember
Fair Value at December 31, 2014	9.5us-gaap_DerivativeFairValueOfDerivativeNet / us-gaap_DerivativeByNatureAxis = us-gaap_SwapMember / us-gaap_DerivativeInstrumentRiskAxis = hrg_OilCommodityContractMember / hrg_DerivativePeriodAxis = hrg_YearTwoMember
Derivative, Commodity Contract, Oil Volume	250,000.0hrg_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	19.5us-gaap_DerivativeFairValueOfDerivativeNet / us-gaap_DerivativeByNatureAxis = us-gaap_SwapMember / us-gaap_DerivativeInstrumentRiskAxis = us-gaap_EnergyRelatedDerivativeMember

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Derivative, Commodity Contract, Natural Gas Volume

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+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 825

-SubTopic 10

-Section 50

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-URI http://asc.fasb.org/extlink&oid=35750535&loc=d3e13433-108611



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-Publisher FASB

-Name Accounting Standards Codification

-Topic 815

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-Section 45

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-URI http://asc.fasb.org/extlink&oid=6945355&loc=d3e41228-113958



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-Publisher FASB

-Name Accounting Standards Codification

-Topic 825

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-Section 50

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-URI http://asc.fasb.org/extlink&oid=35750535&loc=d3e13495-108611



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-Name Accounting Standards Codification

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-Section 45

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