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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 | $ 0 us-gaap_FairValueAssetsLevel1ToLevel2TransfersAmount |  |  |  | $ 0 us-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] | 1,000,000 us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetTransfersNet / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = us-gaap_AssetBackedSecuritiesMember | [2] | (9,400,000)us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetTransfersNet / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = us-gaap_AssetBackedSecuritiesMember | [3] | 1,000,000 us-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 | 17,810,600,000 us-gaap_AvailableForSaleSecuritiesDebtSecurities / us-gaap_InformationByCategoryOfDebtSecurityAxis = hrg_FixedMaturitiesAvailableForSaleMember |  |  |  | 17,810,600,000 us-gaap_AvailableForSaleSecuritiesDebtSecurities / us-gaap_InformationByCategoryOfDebtSecurityAxis = hrg_FixedMaturitiesAvailableForSaleMember |  |  |  | 17,211,500,000 us-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 | $ 1,931,200,000 us-gaap_AvailableForSaleSecuritiesDebtSecurities / us-gaap_InformationByCategoryOfDebtSecurityAxis = hrg_FixedMaturitiesAvailableForSaleMember / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = us-gaap_AssetBackedSecuritiesMember |  |  |  | $ 1,931,200,000 us-gaap_AvailableForSaleSecuritiesDebtSecurities / us-gaap_InformationByCategoryOfDebtSecurityAxis = hrg_FixedMaturitiesAvailableForSaleMember / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = us-gaap_AssetBackedSecuritiesMember |  |  |  | $ 1,792,900,000 us-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

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- Definition Amount of debt securities categorized neither as held-to-maturity nor trading. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 25 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=51813488&loc=d3e22054-111558 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=49167202&loc=d3e26610-111562 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (aa) -URI http://asc.fasb.org/extlink&oid=27724398&loc=d3e27161-111563 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 320 -Section 50 -Paragraph 2 -Subparagraph (b)-(g) -URI http://asc.fasb.org/extlink&oid=6957658&loc=d3e62557-112803 + Details
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