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Income Taxes - Additional Information (Detail) (USD $) In Millions, unless otherwise specified	3 Months Ended		6 Months Ended
	Mar. 31, 2015	Mar. 31, 2014	Mar. 31, 2015	Mar. 31, 2014
Income Taxes [Line Items]
Effective income tax rate	1.70%us-gaap_EffectiveIncomeTaxRateContinuingOperations	19.20%us-gaap_EffectiveIncomeTaxRateContinuingOperations	(3.90%)us-gaap_EffectiveIncomeTaxRateContinuingOperations	(77.20%)us-gaap_EffectiveIncomeTaxRateContinuingOperations
Effective Income Tax Rate Reconciliation, at Federal Statutory Income Tax Rate, Percent	35.00%us-gaap_EffectiveIncomeTaxRateReconciliationAtFederalStatutoryIncomeTaxRate
Income tax (benefit) expense	$ (4.0)us-gaap_IncomeTaxExpenseBenefit	$ (13.3)us-gaap_IncomeTaxExpenseBenefit	$ 12.8us-gaap_IncomeTaxExpenseBenefit	$ 25.0us-gaap_IncomeTaxExpenseBenefit
Increase Decrease In Fair Value Of Equity Conversion Feature Of Preferred Stock		3.5hrg_IncreaseDecreaseInFairValueOfEquityConversionFeatureOfPreferredStock		50.7hrg_IncreaseDecreaseInFairValueOfEquityConversionFeatureOfPreferredStock
Component of Income Tax Benefit Expense, Impairments, Nonrecurring [Member]
Income Taxes [Line Items]
Income tax (benefit) expense			$ 12.3us-gaap_IncomeTaxExpenseBenefit / hrg_ComponentofincometaxbenefitexpenseAxis = hrg_ComponentofIncomeTaxBenefitExpenseImpairmentsNonrecurringMember

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Increase decrease in fair value of equity conversion feature of preferred stock.

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Percentage of current income tax expense (benefit) and deferred income tax expense (benefit) pertaining to continuing operations.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 740

-SubTopic 10

-Section 50

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Percentage of domestic federal statutory tax rate applicable to pretax income (loss).

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Reference 1: http://www.xbrl.org/2003/role/presentationRef

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