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Segment Data - Segment Information (Detail) (USD $) In Millions, unless otherwise specified	3 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Sep. 30, 2014
Revenues:
Consolidated revenues	$ 1,438.4us-gaap_Revenues	$ 1,510.0us-gaap_Revenues
Operating income (loss):
Consolidated operating income	(183.0)us-gaap_OperatingIncomeLoss	179.3us-gaap_OperatingIncomeLoss
Interest expense	(80.6)us-gaap_InterestExpense	(84.0)us-gaap_InterestExpense
Gain on contingent purchase price reduction	0hrg_IncomeFromContingentPurchasePriceReduction	0.5hrg_IncomeFromContingentPurchasePriceReduction
Other income (expense), net	174.0us-gaap_OtherNonoperatingIncomeExpense	(11.9)us-gaap_OtherNonoperatingIncomeExpense
(Loss) income from continuing operations before income taxes	(89.6)us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest	36.7us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest
Total assets:
Consolidated total assets	31,206.7us-gaap_Assets		30,100.2us-gaap_Assets
Total cash provided from operating activities:
Consolidated cash provided from operating activities	(171.7)us-gaap_NetCashProvidedByUsedInOperatingActivities	(89.4)us-gaap_NetCashProvidedByUsedInOperatingActivities
Total segments [Member]
Revenues:
Consolidated revenues	1,417.4us-gaap_Revenues / us-gaap_StatementBusinessSegmentsAxis = us-gaap_OperatingSegmentsMember	1,510.0us-gaap_Revenues / us-gaap_StatementBusinessSegmentsAxis = us-gaap_OperatingSegmentsMember
Operating income (loss):
Consolidated operating income	(59.3)us-gaap_OperatingIncomeLoss / us-gaap_StatementBusinessSegmentsAxis = us-gaap_OperatingSegmentsMember	208.7us-gaap_OperatingIncomeLoss / us-gaap_StatementBusinessSegmentsAxis = us-gaap_OperatingSegmentsMember
Total cash provided from operating activities:
Consolidated cash provided from operating activities	(92.2)us-gaap_NetCashProvidedByUsedInOperatingActivities / us-gaap_StatementBusinessSegmentsAxis = us-gaap_OperatingSegmentsMember	(64.6)us-gaap_NetCashProvidedByUsedInOperatingActivities / us-gaap_StatementBusinessSegmentsAxis = us-gaap_OperatingSegmentsMember
Intersegment elimination [Member]
Revenues:
Consolidated revenues	(3.5)us-gaap_Revenues / us-gaap_StatementBusinessSegmentsAxis = us-gaap_IntersegmentEliminationMember	(3.7)us-gaap_Revenues / us-gaap_StatementBusinessSegmentsAxis = us-gaap_IntersegmentEliminationMember
Operating income (loss):
Consolidated operating income	(4.0)us-gaap_OperatingIncomeLoss / us-gaap_StatementBusinessSegmentsAxis = us-gaap_IntersegmentEliminationMember	(3.7)us-gaap_OperatingIncomeLoss / us-gaap_StatementBusinessSegmentsAxis = us-gaap_IntersegmentEliminationMember
Other income (expense), net	(2.2)us-gaap_OtherNonoperatingIncomeExpense / us-gaap_StatementBusinessSegmentsAxis = us-gaap_IntersegmentEliminationMember
(Loss) income from continuing operations before income taxes	9.1us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest / us-gaap_StatementBusinessSegmentsAxis = us-gaap_IntersegmentEliminationMember	(71.5)us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest / us-gaap_StatementBusinessSegmentsAxis = us-gaap_IntersegmentEliminationMember
Other Financial Services [Member]
Operating income (loss):
Consolidated operating income	(1.1)us-gaap_OperatingIncomeLoss / us-gaap_StatementBusinessSegmentsAxis = us-gaap_AllOtherSegmentsMember	(3.9)us-gaap_OperatingIncomeLoss / us-gaap_StatementBusinessSegmentsAxis = us-gaap_AllOtherSegmentsMember
Asset Management segment [Member]
Revenues:
Consolidated revenues	8.0us-gaap_Revenues / us-gaap_StatementBusinessSegmentsAxis = hrg_AssetManagementsegmentMember	4.5us-gaap_Revenues / us-gaap_StatementBusinessSegmentsAxis = hrg_AssetManagementsegmentMember
Operating income (loss):
Consolidated operating income	(1.1)us-gaap_OperatingIncomeLoss / us-gaap_StatementBusinessSegmentsAxis = hrg_AssetManagementsegmentMember	(3.9)us-gaap_OperatingIncomeLoss / us-gaap_StatementBusinessSegmentsAxis = hrg_AssetManagementsegmentMember
Other income (expense), net	(0.5)us-gaap_OtherNonoperatingIncomeExpense / us-gaap_StatementBusinessSegmentsAxis = hrg_AssetManagementsegmentMember	(3.7)us-gaap_OtherNonoperatingIncomeExpense / us-gaap_StatementBusinessSegmentsAxis = hrg_AssetManagementsegmentMember
(Loss) income from continuing operations before income taxes	(3.1)us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest / us-gaap_StatementBusinessSegmentsAxis = hrg_AssetManagementsegmentMember	(9.0)us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest / us-gaap_StatementBusinessSegmentsAxis = hrg_AssetManagementsegmentMember
Total assets:
Consolidated total assets	670.1us-gaap_Assets / us-gaap_StatementBusinessSegmentsAxis = hrg_AssetManagementsegmentMember		692.5us-gaap_Assets / us-gaap_StatementBusinessSegmentsAxis = hrg_AssetManagementsegmentMember
Total cash provided from operating activities:
Consolidated cash provided from operating activities	(7.9)us-gaap_NetCashProvidedByUsedInOperatingActivities / us-gaap_StatementBusinessSegmentsAxis = hrg_AssetManagementsegmentMember	5.4us-gaap_NetCashProvidedByUsedInOperatingActivities / us-gaap_StatementBusinessSegmentsAxis = hrg_AssetManagementsegmentMember
Energy Segment [Member]
Revenues:
Consolidated revenues	34.3us-gaap_Revenues / us-gaap_StatementBusinessSegmentsAxis = hrg_EnergySegmentMember	35.5us-gaap_Revenues / us-gaap_StatementBusinessSegmentsAxis = hrg_EnergySegmentMember
Operating income (loss):
Consolidated operating income	(195.0)us-gaap_OperatingIncomeLoss / us-gaap_StatementBusinessSegmentsAxis = hrg_EnergySegmentMember	6.0us-gaap_OperatingIncomeLoss / us-gaap_StatementBusinessSegmentsAxis = hrg_EnergySegmentMember
Interest expense	(2.2)us-gaap_InterestExpense / us-gaap_StatementBusinessSegmentsAxis = hrg_EnergySegmentMember	(2.4)us-gaap_InterestExpense / us-gaap_StatementBusinessSegmentsAxis = hrg_EnergySegmentMember
Other income (expense), net	160.0us-gaap_OtherNonoperatingIncomeExpense / us-gaap_StatementBusinessSegmentsAxis = hrg_EnergySegmentMember	(3.4)us-gaap_OtherNonoperatingIncomeExpense / us-gaap_StatementBusinessSegmentsAxis = hrg_EnergySegmentMember
(Loss) income from continuing operations before income taxes	(39.5)us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest / us-gaap_StatementBusinessSegmentsAxis = hrg_EnergySegmentMember	(2.1)us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest / us-gaap_StatementBusinessSegmentsAxis = hrg_EnergySegmentMember
Total assets:
Consolidated total assets	671.0us-gaap_Assets / us-gaap_StatementBusinessSegmentsAxis = hrg_EnergySegmentMember		504.8us-gaap_Assets / us-gaap_StatementBusinessSegmentsAxis = hrg_EnergySegmentMember
Total cash provided from operating activities:
Consolidated cash provided from operating activities	4.4us-gaap_NetCashProvidedByUsedInOperatingActivities / us-gaap_StatementBusinessSegmentsAxis = hrg_EnergySegmentMember	7.2us-gaap_NetCashProvidedByUsedInOperatingActivities / us-gaap_StatementBusinessSegmentsAxis = hrg_EnergySegmentMember
Insurance Segment [Member]
Revenues:
Consolidated revenues	310.8us-gaap_Revenues / us-gaap_StatementBusinessSegmentsAxis = hrg_InsuranceSegmentMember	373.1us-gaap_Revenues / us-gaap_StatementBusinessSegmentsAxis = hrg_InsuranceSegmentMember
Operating income (loss):
Consolidated operating income	25.2us-gaap_OperatingIncomeLoss / us-gaap_StatementBusinessSegmentsAxis = hrg_InsuranceSegmentMember	85.3us-gaap_OperatingIncomeLoss / us-gaap_StatementBusinessSegmentsAxis = hrg_InsuranceSegmentMember
Interest expense	(5.9)us-gaap_InterestExpense / us-gaap_StatementBusinessSegmentsAxis = hrg_InsuranceSegmentMember	(5.6)us-gaap_InterestExpense / us-gaap_StatementBusinessSegmentsAxis = hrg_InsuranceSegmentMember
(Loss) income from continuing operations before income taxes	16.5us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest / us-gaap_StatementBusinessSegmentsAxis = hrg_InsuranceSegmentMember	79.7us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest / us-gaap_StatementBusinessSegmentsAxis = hrg_InsuranceSegmentMember
Total assets:
Consolidated total assets	24,091.9us-gaap_Assets / us-gaap_StatementBusinessSegmentsAxis = hrg_InsuranceSegmentMember		23,195.8us-gaap_Assets / us-gaap_StatementBusinessSegmentsAxis = hrg_InsuranceSegmentMember
Total cash provided from operating activities:
Consolidated cash provided from operating activities	57.8us-gaap_NetCashProvidedByUsedInOperatingActivities / us-gaap_StatementBusinessSegmentsAxis = hrg_InsuranceSegmentMember	58.8us-gaap_NetCashProvidedByUsedInOperatingActivities / us-gaap_StatementBusinessSegmentsAxis = hrg_InsuranceSegmentMember
Consumer Products Segment [Member]
Revenues:
Consolidated revenues	1,067.8us-gaap_Revenues / us-gaap_StatementBusinessSegmentsAxis = hrg_ConsumerProductsSegmentMember	1,100.6us-gaap_Revenues / us-gaap_StatementBusinessSegmentsAxis = hrg_ConsumerProductsSegmentMember
Operating income (loss):
Consolidated operating income	115.6us-gaap_OperatingIncomeLoss / us-gaap_StatementBusinessSegmentsAxis = hrg_ConsumerProductsSegmentMember	125.0us-gaap_OperatingIncomeLoss / us-gaap_StatementBusinessSegmentsAxis = hrg_ConsumerProductsSegmentMember
Interest expense	(44.4)us-gaap_InterestExpense / us-gaap_StatementBusinessSegmentsAxis = hrg_ConsumerProductsSegmentMember	(57.0)us-gaap_InterestExpense / us-gaap_StatementBusinessSegmentsAxis = hrg_ConsumerProductsSegmentMember
Other income (expense), net	(0.7)us-gaap_OtherNonoperatingIncomeExpense / us-gaap_StatementBusinessSegmentsAxis = hrg_ConsumerProductsSegmentMember	(0.9)us-gaap_OtherNonoperatingIncomeExpense / us-gaap_StatementBusinessSegmentsAxis = hrg_ConsumerProductsSegmentMember
(Loss) income from continuing operations before income taxes	70.5us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest / us-gaap_StatementBusinessSegmentsAxis = hrg_ConsumerProductsSegmentMember	67.1us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest / us-gaap_StatementBusinessSegmentsAxis = hrg_ConsumerProductsSegmentMember
Total assets:
Consolidated total assets	5,832.1us-gaap_Assets / us-gaap_StatementBusinessSegmentsAxis = hrg_ConsumerProductsSegmentMember		5,513.0us-gaap_Assets / us-gaap_StatementBusinessSegmentsAxis = hrg_ConsumerProductsSegmentMember
Total cash provided from operating activities:
Consolidated cash provided from operating activities	(146.5)us-gaap_NetCashProvidedByUsedInOperatingActivities / us-gaap_StatementBusinessSegmentsAxis = hrg_ConsumerProductsSegmentMember	(136.0)us-gaap_NetCashProvidedByUsedInOperatingActivities / us-gaap_StatementBusinessSegmentsAxis = hrg_ConsumerProductsSegmentMember
Corporate expenses [Member]
Revenues:
Consolidated revenues	21.0us-gaap_Revenues / us-gaap_StatementBusinessSegmentsAxis = us-gaap_CorporateAndOtherMember
Operating income (loss):
Consolidated operating income	(123.7)us-gaap_OperatingIncomeLoss / us-gaap_StatementBusinessSegmentsAxis = us-gaap_CorporateAndOtherMember	(29.4)us-gaap_OperatingIncomeLoss / us-gaap_StatementBusinessSegmentsAxis = us-gaap_CorporateAndOtherMember
Interest expense	(28.1)us-gaap_InterestExpense / us-gaap_StatementBusinessSegmentsAxis = us-gaap_CorporateAndOtherMember	(19.0)us-gaap_InterestExpense / us-gaap_StatementBusinessSegmentsAxis = us-gaap_CorporateAndOtherMember
Gain on contingent purchase price reduction		0.5hrg_IncomeFromContingentPurchasePriceReduction / us-gaap_StatementBusinessSegmentsAxis = us-gaap_CorporateAndOtherMember
Other income (expense), net	17.4us-gaap_OtherNonoperatingIncomeExpense / us-gaap_StatementBusinessSegmentsAxis = us-gaap_CorporateAndOtherMember	(3.9)us-gaap_OtherNonoperatingIncomeExpense / us-gaap_StatementBusinessSegmentsAxis = us-gaap_CorporateAndOtherMember
(Loss) income from continuing operations before income taxes	(143.1)us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest / us-gaap_StatementBusinessSegmentsAxis = us-gaap_CorporateAndOtherMember	(27.5)us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest / us-gaap_StatementBusinessSegmentsAxis = us-gaap_CorporateAndOtherMember
Total assets:
Consolidated total assets	2,720.7us-gaap_Assets / us-gaap_StatementBusinessSegmentsAxis = us-gaap_CorporateAndOtherMember		2,933.1us-gaap_Assets / us-gaap_StatementBusinessSegmentsAxis = us-gaap_CorporateAndOtherMember
Corporate Segment [Member]
Total cash provided from operating activities:
Consolidated cash provided from operating activities	$ (79.5)us-gaap_NetCashProvidedByUsedInOperatingActivities / us-gaap_StatementBusinessSegmentsAxis = us-gaap_CorporateMember	$ (24.8)us-gaap_NetCashProvidedByUsedInOperatingActivities / us-gaap_StatementBusinessSegmentsAxis = us-gaap_CorporateMember

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