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Investments - Schedule of Credit Quality of Asset-Based Loan Portfolio (Detail) (USD $) In Millions, unless otherwise specified	Mar. 31, 2015		Sep. 30, 2014
Financing Receivable, Recorded Investment [Line Items]
Loans Receivable, Gross, Commercial, Mortgage	$ 304.4us-gaap_LoansReceivableCommercialMortgage		$ 136.2us-gaap_LoansReceivableCommercialMortgage
Commercial Mortgage Receivable, Percentage of Total	100.00%hrg_CommercialMortgageReceivablePercentageofTotal		100.00%hrg_CommercialMortgageReceivablePercentageofTotal
Asset-based loans, by credit quality rating
Asset Backed Loans And Other Invested Assets Gross	694.0hrg_AssetBackedLoansAndOtherInvestedAssetsGross		818.8hrg_AssetBackedLoansAndOtherInvestedAssetsGross
Substandard [Member]
Asset-based loans, by credit quality rating
Asset Backed Loans And Other Invested Assets Gross	326.3hrg_AssetBackedLoansAndOtherInvestedAssetsGross / us-gaap_InternalCreditAssessmentAxis = us-gaap_SubstandardMember		250.8hrg_AssetBackedLoansAndOtherInvestedAssetsGross / us-gaap_InternalCreditAssessmentAxis = us-gaap_SubstandardMember
Doubtful [Member]
Asset-based loans, by credit quality rating
Asset Backed Loans And Other Invested Assets Gross	167.1hrg_AssetBackedLoansAndOtherInvestedAssetsGross / us-gaap_InternalCreditAssessmentAxis = us-gaap_DoubtfulMember
Special Mention [Member]
Asset-based loans, by credit quality rating
Asset Backed Loans And Other Invested Assets Gross	57.8hrg_AssetBackedLoansAndOtherInvestedAssetsGross / us-gaap_InternalCreditAssessmentAxis = us-gaap_SpecialMentionMember		372.7hrg_AssetBackedLoansAndOtherInvestedAssetsGross / us-gaap_InternalCreditAssessmentAxis = us-gaap_SpecialMentionMember
Pass [Member]
Asset-based loans, by credit quality rating
Asset Backed Loans And Other Invested Assets Gross	142.8hrg_AssetBackedLoansAndOtherInvestedAssetsGross / us-gaap_InternalCreditAssessmentAxis = us-gaap_PassMember		195.3hrg_AssetBackedLoansAndOtherInvestedAssetsGross / us-gaap_InternalCreditAssessmentAxis = us-gaap_PassMember
LTV Less Than 50 Percent [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans Receivable, Gross, Commercial, Mortgage	75.0us-gaap_LoansReceivableCommercialMortgage / us-gaap_LoanToValueAxis = hrg_LTVLessThan50PercentMember		45.4us-gaap_LoansReceivableCommercialMortgage / us-gaap_LoanToValueAxis = hrg_LTVLessThan50PercentMember
Commercial Mortgage Receivable, Percentage of Total	24.60%hrg_CommercialMortgageReceivablePercentageofTotal / us-gaap_LoanToValueAxis = hrg_LTVLessThan50PercentMember		33.30%hrg_CommercialMortgageReceivablePercentageofTotal / us-gaap_LoanToValueAxis = hrg_LTVLessThan50PercentMember
LTV 50 to 60 Percent [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans Receivable, Gross, Commercial, Mortgage	83.7us-gaap_LoansReceivableCommercialMortgage / us-gaap_LoanToValueAxis = hrg_LTV50to60PercentMember		19.9us-gaap_LoansReceivableCommercialMortgage / us-gaap_LoanToValueAxis = hrg_LTV50to60PercentMember
Commercial Mortgage Receivable, Percentage of Total	27.50%hrg_CommercialMortgageReceivablePercentageofTotal / us-gaap_LoanToValueAxis = hrg_LTV50to60PercentMember		14.60%hrg_CommercialMortgageReceivablePercentageofTotal / us-gaap_LoanToValueAxis = hrg_LTV50to60PercentMember
LTV 60 to 75 Percent [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans Receivable, Gross, Commercial, Mortgage	145.7us-gaap_LoansReceivableCommercialMortgage / us-gaap_LoanToValueAxis = hrg_LTV60to75PercentMember		70.9us-gaap_LoansReceivableCommercialMortgage / us-gaap_LoanToValueAxis = hrg_LTV60to75PercentMember
Commercial Mortgage Receivable, Percentage of Total	47.90%hrg_CommercialMortgageReceivablePercentageofTotal / us-gaap_LoanToValueAxis = hrg_LTV60to75PercentMember		52.10%hrg_CommercialMortgageReceivablePercentageofTotal / us-gaap_LoanToValueAxis = hrg_LTV60to75PercentMember
Greater Than One Point Two Five [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans Receivable, Gross, Commercial, Mortgage	283.7us-gaap_LoansReceivableCommercialMortgage / hrg_DebtServiceCoverageAxis = hrg_GreaterThanOnePointTwoFiveMember		135.4us-gaap_LoansReceivableCommercialMortgage / hrg_DebtServiceCoverageAxis = hrg_GreaterThanOnePointTwoFiveMember
Greater Than One Point Two Five [Member] | LTV Less Than 50 Percent [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans Receivable, Gross, Commercial, Mortgage	74.2us-gaap_LoansReceivableCommercialMortgage / hrg_DebtServiceCoverageAxis = hrg_GreaterThanOnePointTwoFiveMember / us-gaap_LoanToValueAxis = hrg_LTVLessThan50PercentMember		44.6us-gaap_LoansReceivableCommercialMortgage / hrg_DebtServiceCoverageAxis = hrg_GreaterThanOnePointTwoFiveMember / us-gaap_LoanToValueAxis = hrg_LTVLessThan50PercentMember
Greater Than One Point Two Five [Member] | LTV 50 to 60 Percent [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans Receivable, Gross, Commercial, Mortgage	63.8us-gaap_LoansReceivableCommercialMortgage / hrg_DebtServiceCoverageAxis = hrg_GreaterThanOnePointTwoFiveMember / us-gaap_LoanToValueAxis = hrg_LTV50to60PercentMember		19.9us-gaap_LoansReceivableCommercialMortgage / hrg_DebtServiceCoverageAxis = hrg_GreaterThanOnePointTwoFiveMember / us-gaap_LoanToValueAxis = hrg_LTV50to60PercentMember
Greater Than One Point Two Five [Member] | LTV 60 to 75 Percent [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans Receivable, Gross, Commercial, Mortgage	145.7us-gaap_LoansReceivableCommercialMortgage / hrg_DebtServiceCoverageAxis = hrg_GreaterThanOnePointTwoFiveMember / us-gaap_LoanToValueAxis = hrg_LTV60to75PercentMember		70.9us-gaap_LoansReceivableCommercialMortgage / hrg_DebtServiceCoverageAxis = hrg_GreaterThanOnePointTwoFiveMember / us-gaap_LoanToValueAxis = hrg_LTV60to75PercentMember
Greater Than One But Less Than One Point Two Five [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans Receivable, Gross, Commercial, Mortgage	19.9us-gaap_LoansReceivableCommercialMortgage / hrg_DebtServiceCoverageAxis = hrg_GreaterThanOneButLessThanOnePointTwoFiveMember		0us-gaap_LoansReceivableCommercialMortgage / hrg_DebtServiceCoverageAxis = hrg_GreaterThanOneButLessThanOnePointTwoFiveMember
Greater Than One But Less Than One Point Two Five [Member] | LTV Less Than 50 Percent [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans Receivable, Gross, Commercial, Mortgage	0us-gaap_LoansReceivableCommercialMortgage / hrg_DebtServiceCoverageAxis = hrg_GreaterThanOneButLessThanOnePointTwoFiveMember / us-gaap_LoanToValueAxis = hrg_LTVLessThan50PercentMember		0us-gaap_LoansReceivableCommercialMortgage / hrg_DebtServiceCoverageAxis = hrg_GreaterThanOneButLessThanOnePointTwoFiveMember / us-gaap_LoanToValueAxis = hrg_LTVLessThan50PercentMember
Greater Than One But Less Than One Point Two Five [Member] | LTV 50 to 60 Percent [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans Receivable, Gross, Commercial, Mortgage	19.9us-gaap_LoansReceivableCommercialMortgage / hrg_DebtServiceCoverageAxis = hrg_GreaterThanOneButLessThanOnePointTwoFiveMember / us-gaap_LoanToValueAxis = hrg_LTV50to60PercentMember		0us-gaap_LoansReceivableCommercialMortgage / hrg_DebtServiceCoverageAxis = hrg_GreaterThanOneButLessThanOnePointTwoFiveMember / us-gaap_LoanToValueAxis = hrg_LTV50to60PercentMember
Greater Than One But Less Than One Point Two Five [Member] | LTV 60 to 75 Percent [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans Receivable, Gross, Commercial, Mortgage	0us-gaap_LoansReceivableCommercialMortgage / hrg_DebtServiceCoverageAxis = hrg_GreaterThanOneButLessThanOnePointTwoFiveMember / us-gaap_LoanToValueAxis = hrg_LTV60to75PercentMember		0us-gaap_LoansReceivableCommercialMortgage / hrg_DebtServiceCoverageAxis = hrg_GreaterThanOneButLessThanOnePointTwoFiveMember / us-gaap_LoanToValueAxis = hrg_LTV60to75PercentMember
Ratio Not Available [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans Receivable, Gross, Commercial, Mortgage	0.8us-gaap_LoansReceivableCommercialMortgage / hrg_DebtServiceCoverageAxis = hrg_RatioNotAvailableMember	[1]	0.8us-gaap_LoansReceivableCommercialMortgage / hrg_DebtServiceCoverageAxis = hrg_RatioNotAvailableMember	[1]
Ratio Not Available [Member] | LTV Less Than 50 Percent [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans Receivable, Gross, Commercial, Mortgage	0.8us-gaap_LoansReceivableCommercialMortgage / hrg_DebtServiceCoverageAxis = hrg_RatioNotAvailableMember / us-gaap_LoanToValueAxis = hrg_LTVLessThan50PercentMember	[1]	0.8us-gaap_LoansReceivableCommercialMortgage / hrg_DebtServiceCoverageAxis = hrg_RatioNotAvailableMember / us-gaap_LoanToValueAxis = hrg_LTVLessThan50PercentMember	[1]
Ratio Not Available [Member] | LTV 50 to 60 Percent [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans Receivable, Gross, Commercial, Mortgage	0us-gaap_LoansReceivableCommercialMortgage / hrg_DebtServiceCoverageAxis = hrg_RatioNotAvailableMember / us-gaap_LoanToValueAxis = hrg_LTV50to60PercentMember	[1]	0us-gaap_LoansReceivableCommercialMortgage / hrg_DebtServiceCoverageAxis = hrg_RatioNotAvailableMember / us-gaap_LoanToValueAxis = hrg_LTV50to60PercentMember	[1]
Ratio Not Available [Member] | LTV 60 to 75 Percent [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans Receivable, Gross, Commercial, Mortgage	0us-gaap_LoansReceivableCommercialMortgage / hrg_DebtServiceCoverageAxis = hrg_RatioNotAvailableMember / us-gaap_LoanToValueAxis = hrg_LTV60to75PercentMember	[1]	0us-gaap_LoansReceivableCommercialMortgage / hrg_DebtServiceCoverageAxis = hrg_RatioNotAvailableMember / us-gaap_LoanToValueAxis = hrg_LTV60to75PercentMember	[1]
Estimate of Fair Value Measurement [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans Receivable, Gross, Commercial, Mortgage	304.4us-gaap_LoansReceivableCommercialMortgage / us-gaap_FairValueByMeasurementBasisAxis = us-gaap_EstimateOfFairValueFairValueDisclosureMember		136.2us-gaap_LoansReceivableCommercialMortgage / us-gaap_FairValueByMeasurementBasisAxis = us-gaap_EstimateOfFairValueFairValueDisclosureMember
Commercial Mortgage Receivable, Percentage of Total	100.00%hrg_CommercialMortgageReceivablePercentageofTotal / us-gaap_FairValueByMeasurementBasisAxis = us-gaap_EstimateOfFairValueFairValueDisclosureMember		100.00%hrg_CommercialMortgageReceivablePercentageofTotal / us-gaap_FairValueByMeasurementBasisAxis = us-gaap_EstimateOfFairValueFairValueDisclosureMember
Estimate of Fair Value Measurement [Member] | LTV Less Than 50 Percent [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans Receivable, Gross, Commercial, Mortgage	75.0us-gaap_LoansReceivableCommercialMortgage / us-gaap_FairValueByMeasurementBasisAxis = us-gaap_EstimateOfFairValueFairValueDisclosureMember / us-gaap_LoanToValueAxis = hrg_LTVLessThan50PercentMember		45.4us-gaap_LoansReceivableCommercialMortgage / us-gaap_FairValueByMeasurementBasisAxis = us-gaap_EstimateOfFairValueFairValueDisclosureMember / us-gaap_LoanToValueAxis = hrg_LTVLessThan50PercentMember
Commercial Mortgage Receivable, Percentage of Total	24.60%hrg_CommercialMortgageReceivablePercentageofTotal / us-gaap_FairValueByMeasurementBasisAxis = us-gaap_EstimateOfFairValueFairValueDisclosureMember / us-gaap_LoanToValueAxis = hrg_LTVLessThan50PercentMember		33.30%hrg_CommercialMortgageReceivablePercentageofTotal / us-gaap_FairValueByMeasurementBasisAxis = us-gaap_EstimateOfFairValueFairValueDisclosureMember / us-gaap_LoanToValueAxis = hrg_LTVLessThan50PercentMember
Estimate of Fair Value Measurement [Member] | LTV 50 to 60 Percent [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans Receivable, Gross, Commercial, Mortgage	83.7us-gaap_LoansReceivableCommercialMortgage / us-gaap_FairValueByMeasurementBasisAxis = us-gaap_EstimateOfFairValueFairValueDisclosureMember / us-gaap_LoanToValueAxis = hrg_LTV50to60PercentMember		19.9us-gaap_LoansReceivableCommercialMortgage / us-gaap_FairValueByMeasurementBasisAxis = us-gaap_EstimateOfFairValueFairValueDisclosureMember / us-gaap_LoanToValueAxis = hrg_LTV50to60PercentMember
Commercial Mortgage Receivable, Percentage of Total	27.50%hrg_CommercialMortgageReceivablePercentageofTotal / us-gaap_FairValueByMeasurementBasisAxis = us-gaap_EstimateOfFairValueFairValueDisclosureMember / us-gaap_LoanToValueAxis = hrg_LTV50to60PercentMember		14.60%hrg_CommercialMortgageReceivablePercentageofTotal / us-gaap_FairValueByMeasurementBasisAxis = us-gaap_EstimateOfFairValueFairValueDisclosureMember / us-gaap_LoanToValueAxis = hrg_LTV50to60PercentMember
Estimate of Fair Value Measurement [Member] | LTV 60 to 75 Percent [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans Receivable, Gross, Commercial, Mortgage	$ 145.7us-gaap_LoansReceivableCommercialMortgage / us-gaap_FairValueByMeasurementBasisAxis = us-gaap_EstimateOfFairValueFairValueDisclosureMember / us-gaap_LoanToValueAxis = hrg_LTV60to75PercentMember		$ 70.9us-gaap_LoansReceivableCommercialMortgage / us-gaap_FairValueByMeasurementBasisAxis = us-gaap_EstimateOfFairValueFairValueDisclosureMember / us-gaap_LoanToValueAxis = hrg_LTV60to75PercentMember
Commercial Mortgage Receivable, Percentage of Total	47.90%hrg_CommercialMortgageReceivablePercentageofTotal / us-gaap_FairValueByMeasurementBasisAxis = us-gaap_EstimateOfFairValueFairValueDisclosureMember / us-gaap_LoanToValueAxis = hrg_LTV60to75PercentMember		52.10%hrg_CommercialMortgageReceivablePercentageofTotal / us-gaap_FairValueByMeasurementBasisAxis = us-gaap_EstimateOfFairValueFairValueDisclosureMember / us-gaap_LoanToValueAxis = hrg_LTV60to75PercentMember
[1] (a) N/A - Current financial information not available.

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Asset Backed Loans And Other Invested Assets Gross

+ References

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+ References

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- Definition

Amount before allowance of mortgage loans on existing land or building. Includes deferred interest and fees, undisbursed portion of loan balance, unamortized costs and premiums and discounts from face amounts. Excludes loans covered under loss sharing agreements.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 310

-SubTopic 10

-Section 50

-Paragraph 3

-URI http://asc.fasb.org/extlink&oid=49124121&loc=d3e5066-111524



Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 942

-SubTopic 210

-Section S99

-Paragraph 1

-Subparagraph (SX 210.9-03.7(a)(3))

-URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878

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