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Fair Value of Financial Instruments - Additional Information (Detail) (USD $)
 3 Months Ended 6 Months Ended
Mar. 31, 2015
Mar. 31, 2014
Mar. 31, 2015
Mar. 31, 2014
Sep. 30, 2014
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]          
Percentage of male contractholder     50.00%hrg_PercentageOfMaleContractHolder    
Percentage of female contractholder     50.00%hrg_PercentageOfFemaleContractHolder    
Fair Value, Assets, Level 1 to Level 2 Transfers, Amount $ 0us-gaap_FairValueAssetsLevel1ToLevel2TransfersAmount   $ 0us-gaap_FairValueAssetsLevel1ToLevel2TransfersAmount    
Net transfer In (Out) of Level 3 (a) (27,600,000)us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetTransfersNet [1] (5,000,000)us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetTransfersNet [2] (33,500,000)us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetTransfersNet [3] (5,000,000)us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetTransfersNet [4]  
Asset-backed Securities [Member]          
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]          
Net transfer In (Out) of Level 3 (a) (3,500,000)us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetTransfersNet
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_AssetBackedSecuritiesMember		 [1] 1,000,000us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetTransfersNet
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_AssetBackedSecuritiesMember		 [2] (9,400,000)us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetTransfersNet
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_AssetBackedSecuritiesMember		 [3] 1,000,000us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetTransfersNet
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_AssetBackedSecuritiesMember		 [4]  
Fixed Maturities Available For Sale [Member]          
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]          
Available-for-sale Securities, Debt Securities 17,810,600,000us-gaap_AvailableForSaleSecuritiesDebtSecurities
/ us-gaap_InformationByCategoryOfDebtSecurityAxis
= hrg_FixedMaturitiesAvailableForSaleMember		   17,810,600,000us-gaap_AvailableForSaleSecuritiesDebtSecurities
/ us-gaap_InformationByCategoryOfDebtSecurityAxis
= hrg_FixedMaturitiesAvailableForSaleMember		   17,211,500,000us-gaap_AvailableForSaleSecuritiesDebtSecurities
/ us-gaap_InformationByCategoryOfDebtSecurityAxis
= hrg_FixedMaturitiesAvailableForSaleMember
Fixed Maturities Available For Sale [Member] | Asset-backed Securities [Member]          
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]          
Available-for-sale Securities, Debt Securities $ 1,931,200,000us-gaap_AvailableForSaleSecuritiesDebtSecurities
/ us-gaap_InformationByCategoryOfDebtSecurityAxis
= hrg_FixedMaturitiesAvailableForSaleMember
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_AssetBackedSecuritiesMember		   $ 1,931,200,000us-gaap_AvailableForSaleSecuritiesDebtSecurities
/ us-gaap_InformationByCategoryOfDebtSecurityAxis
= hrg_FixedMaturitiesAvailableForSaleMember
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_AssetBackedSecuritiesMember		   $ 1,792,900,000us-gaap_AvailableForSaleSecuritiesDebtSecurities
/ us-gaap_InformationByCategoryOfDebtSecurityAxis
= hrg_FixedMaturitiesAvailableForSaleMember
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_AssetBackedSecuritiesMember
[1] (a) The net transfers out of Level 3 during the three months ended March 31, 2015 were exclusively to Level 2.
[2] (a) The net transfers out of Level 3 during the three months ended March 31, 2014 were exclusively to Level 2. There was a $6.0 transfer to asset-backed securities from commercial mortgage-backed securities
[3] (a) The net transfers out of Level 3 during the six months ended March 31, 2015 were exclusively to Level 2.
[4] (a) The net transfers out of Level 3 during the six months ended March 31, 2015 were exclusively to Level 2. There was a $6.0 transfer to asset-backed securities from commercial mortgage-backed securities