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Investments - Portfolio of Asset-Backed Loans and Other Invested Assets (Detail) (USD $)
In Millions, unless otherwise specified
3 Months Ended 6 Months Ended
Mar. 31, 2015
Mar. 31, 2015
Mar. 31, 2014
Dec. 31, 2014
Sep. 30, 2014
Dec. 31, 2013
Sep. 30, 2013
Asset-backed loans, by major industry:              
Total asset-backed loans $ 694.0hrg_AssetBackedLoansAndOtherInvestedAssetsGross $ 694.0hrg_AssetBackedLoansAndOtherInvestedAssetsGross     $ 818.8hrg_AssetBackedLoansAndOtherInvestedAssetsGross    
Less: Allowance for credit losses 33.8hrg_AllowanceForCreditLosses 33.8hrg_AllowanceForCreditLosses     7.2hrg_AllowanceForCreditLosses    
Total asset-backed loans, net 660.2hrg_AssetBackedLoansAndOtherInvestedAssets 660.2hrg_AssetBackedLoansAndOtherInvestedAssets     811.6hrg_AssetBackedLoansAndOtherInvestedAssets    
Financing Receivable, Allowance for Credit Losses 33.8us-gaap_FinancingReceivableAllowanceForCreditLosses 33.8us-gaap_FinancingReceivableAllowanceForCreditLosses 7.0us-gaap_FinancingReceivableAllowanceForCreditLosses 7.5us-gaap_FinancingReceivableAllowanceForCreditLosses 7.2us-gaap_FinancingReceivableAllowanceForCreditLosses 7.0us-gaap_FinancingReceivableAllowanceForCreditLosses 5.2us-gaap_FinancingReceivableAllowanceForCreditLosses
Provision for Loan, Lease, and Other Losses 102.9us-gaap_ProvisionForLoanLeaseAndOtherLosses 103.2us-gaap_ProvisionForLoanLeaseAndOtherLosses 1.8us-gaap_ProvisionForLoanLeaseAndOtherLosses        
Apparel [Member]              
Asset-backed loans, by major industry:              
Total asset-backed loans 188.1hrg_AssetBackedLoansAndOtherInvestedAssetsGross
/ us-gaap_RegulatoryAssetAxis
= hrg_ApparelMember
188.1hrg_AssetBackedLoansAndOtherInvestedAssetsGross
/ us-gaap_RegulatoryAssetAxis
= hrg_ApparelMember
    191.6hrg_AssetBackedLoansAndOtherInvestedAssetsGross
/ us-gaap_RegulatoryAssetAxis
= hrg_ApparelMember
   
Jewelry [Member]              
Asset-backed loans, by major industry:              
Total asset-backed loans 83.9hrg_AssetBackedLoansAndOtherInvestedAssetsGross
/ us-gaap_RegulatoryAssetAxis
= hrg_JewelryMember
83.9hrg_AssetBackedLoansAndOtherInvestedAssetsGross
/ us-gaap_RegulatoryAssetAxis
= hrg_JewelryMember
    100.1hrg_AssetBackedLoansAndOtherInvestedAssetsGross
/ us-gaap_RegulatoryAssetAxis
= hrg_JewelryMember
   
Home Furnishings [Member]              
Asset-backed loans, by major industry:              
Total asset-backed loans 55.7hrg_AssetBackedLoansAndOtherInvestedAssetsGross
/ us-gaap_RegulatoryAssetAxis
= hrg_HomeFurnishingsMember
55.7hrg_AssetBackedLoansAndOtherInvestedAssetsGross
/ us-gaap_RegulatoryAssetAxis
= hrg_HomeFurnishingsMember
    71.7hrg_AssetBackedLoansAndOtherInvestedAssetsGross
/ us-gaap_RegulatoryAssetAxis
= hrg_HomeFurnishingsMember
   
Manufacturing [Member]              
Asset-backed loans, by major industry:              
Total asset-backed loans 49.9hrg_AssetBackedLoansAndOtherInvestedAssetsGross
/ us-gaap_RegulatoryAssetAxis
= hrg_ManufacturingMember
49.9hrg_AssetBackedLoansAndOtherInvestedAssetsGross
/ us-gaap_RegulatoryAssetAxis
= hrg_ManufacturingMember
    56.9hrg_AssetBackedLoansAndOtherInvestedAssetsGross
/ us-gaap_RegulatoryAssetAxis
= hrg_ManufacturingMember
   
Other [Member]              
Asset-backed loans, by major industry:              
Total asset-backed loans 105.0hrg_AssetBackedLoansAndOtherInvestedAssetsGross
/ us-gaap_RegulatoryAssetAxis
= hrg_OthersMember
105.0hrg_AssetBackedLoansAndOtherInvestedAssetsGross
/ us-gaap_RegulatoryAssetAxis
= hrg_OthersMember
    94.9hrg_AssetBackedLoansAndOtherInvestedAssetsGross
/ us-gaap_RegulatoryAssetAxis
= hrg_OthersMember
   
Transportation [Member]              
Asset-backed loans, by major industry:              
Total asset-backed loans 32.5hrg_AssetBackedLoansAndOtherInvestedAssetsGross
/ us-gaap_RegulatoryAssetAxis
= hrg_TransportationMember
32.5hrg_AssetBackedLoansAndOtherInvestedAssetsGross
/ us-gaap_RegulatoryAssetAxis
= hrg_TransportationMember
    44.3hrg_AssetBackedLoansAndOtherInvestedAssetsGross
/ us-gaap_RegulatoryAssetAxis
= hrg_TransportationMember
   
Electronics [Member]              
Asset-backed loans, by major industry:              
Total asset-backed loans 167.1hrg_AssetBackedLoansAndOtherInvestedAssetsGross
/ us-gaap_RegulatoryAssetAxis
= hrg_ElectronicsMember
167.1hrg_AssetBackedLoansAndOtherInvestedAssetsGross
/ us-gaap_RegulatoryAssetAxis
= hrg_ElectronicsMember
    245.4hrg_AssetBackedLoansAndOtherInvestedAssetsGross
/ us-gaap_RegulatoryAssetAxis
= hrg_ElectronicsMember
   
451110 Sporting Goods Stores [Member]              
Asset-backed loans, by major industry:              
Total asset-backed loans $ 11.8hrg_AssetBackedLoansAndOtherInvestedAssetsGross
/ us-gaap_RegulatoryAssetAxis
= naics_ZZ451110
$ 11.8hrg_AssetBackedLoansAndOtherInvestedAssetsGross
/ us-gaap_RegulatoryAssetAxis
= naics_ZZ451110
    $ 13.9hrg_AssetBackedLoansAndOtherInvestedAssetsGross
/ us-gaap_RegulatoryAssetAxis
= naics_ZZ451110