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Income Taxes - Additional Information (Detail) (USD $)
In Millions, unless otherwise specified
3 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Income Taxes [Line Items]    
Effective income tax rate (18.80%)us-gaap_EffectiveIncomeTaxRateContinuingOperations 104.40%us-gaap_EffectiveIncomeTaxRateContinuingOperations
Effective Income Tax Rate Reconciliation, at Federal Statutory Income Tax Rate, Percent 0.00%us-gaap_EffectiveIncomeTaxRateReconciliationAtFederalStatutoryIncomeTaxRate 0.00%us-gaap_EffectiveIncomeTaxRateReconciliationAtFederalStatutoryIncomeTaxRate
Income tax expense $ 12.3us-gaap_IncomeTaxReconciliationOtherReconcilingItems  
Document Period End Date Dec. 31, 2014  
Increase Decrease In Fair Value Of Equity Conversion Feature Of Preferred Stock $ 0hrg_IncreaseDecreaseInFairValueOfEquityConversionFeatureOfPreferredStock $ 47.2hrg_IncreaseDecreaseInFairValueOfEquityConversionFeatureOfPreferredStock