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Related Party Transactions - Additional Information (Detail) (USD $) In Millions, except Per Share data, unless otherwise specified	3 Months Ended		6 Months Ended
	Mar. 31, 2015	Mar. 31, 2014	Mar. 31, 2015	Mar. 31, 2014	Mar. 18, 2014
Related Party Transaction [Line Items]
Expenses related to Services Agreement	$ 0.6us-gaap_RelatedPartyTransactionSellingGeneralAndAdministrativeExpensesFromTransactionsWithRelatedParty	$ 1.5us-gaap_RelatedPartyTransactionSellingGeneralAndAdministrativeExpensesFromTransactionsWithRelatedParty	$ 2.6us-gaap_RelatedPartyTransactionSellingGeneralAndAdministrativeExpensesFromTransactionsWithRelatedParty	$ 2.9us-gaap_RelatedPartyTransactionSellingGeneralAndAdministrativeExpensesFromTransactionsWithRelatedParty
Preferred Stock [Member] | HCP Stockholders [Member]
Related Party Transaction [Line Items]
Stock Issued During Period, Shares, Acquisitions			23us-gaap_StockIssuedDuringPeriodSharesAcquisitions / dei_LegalEntityAxis = hrg_HCPStockholdersMember / us-gaap_StatementClassOfStockAxis = us-gaap_PreferredStockMember
Share Price					$ 11.00us-gaap_SharePrice / dei_LegalEntityAxis = hrg_HCPStockholdersMember / us-gaap_StatementClassOfStockAxis = us-gaap_PreferredStockMember
Stock Issued During Period, Value, Acquisitions			253.0us-gaap_StockIssuedDuringPeriodValueAcquisitions / dei_LegalEntityAxis = hrg_HCPStockholdersMember / us-gaap_StatementClassOfStockAxis = us-gaap_PreferredStockMember
Maximum [Member] | Leucadia [Member]
Related Party Transaction [Line Items]
Percentage Of Beneficial Ownership			27.50%hrg_PercentageOfBeneficialOwnership / us-gaap_RangeAxis = us-gaap_MaximumMember / us-gaap_RelatedPartyTransactionsByRelatedPartyAxis = hrg_LeucadiaMember
Maximum [Member] | Leucadia [Member]
Related Party Transaction [Line Items]
Percentage Of Beneficial Ownership			4.90%hrg_PercentageOfBeneficialOwnership / dei_LegalEntityAxis = hrg_LeucadiaMember / us-gaap_RangeAxis = us-gaap_MaximumMember
Severance Cost, one time payments [Member]
Related Party Transaction [Line Items]
Severance Costs			20.5us-gaap_SeveranceCosts1 / hrg_SeveranceCostClassificationAxis = hrg_SeveranceCostonetimepaymentsMember
Severance Cost, Accrued Bonus [Member]
Related Party Transaction [Line Items]
Severance Costs			16.5us-gaap_SeveranceCosts1 / hrg_SeveranceCostClassificationAxis = hrg_SeveranceCostAccruedBonusMember
Severance Cost, Future Bonus [Member]
Related Party Transaction [Line Items]
Severance Costs			$ 3.3us-gaap_SeveranceCosts1 / hrg_SeveranceCostClassificationAxis = hrg_SeveranceCostFutureBonusMember

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- Definition

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Amount of selling, general and administrative expenses resulting from transactions, excluding transactions that are eliminated in consolidated or combined financial statements, with related party.

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- Definition

Amount of expenses for special or contractual termination benefits provided to current employees involuntarily terminated under a benefit arrangement associated exit or disposal activities pursuant to an authorized plan. Excludes expenses related to one-time termination benefits, a discontinued operation or an asset retirement obligation.

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Number of shares of stock issued during the period pursuant to acquisitions.

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