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Earnings Per Share - Summary of Basic and Diluted EPS (Detail) (USD $)
In Millions, except Share data in Thousands, unless otherwise specified
 3 Months Ended 6 Months Ended
Mar. 31, 2015
Mar. 31, 2014
Mar. 31, 2015
Mar. 31, 2014
Earnings Per Share [Abstract]        
Net income (loss) attributable to common and participating preferred stockholders $ (228.3)hrg_NetIncomeLossAttributableToCommonAndParticipatingPreferredStockholders $ (87.6)hrg_NetIncomeLossAttributableToCommonAndParticipatingPreferredStockholders $ (338.1)hrg_NetIncomeLossAttributableToCommonAndParticipatingPreferredStockholders $ (126.6)hrg_NetIncomeLossAttributableToCommonAndParticipatingPreferredStockholders
Participating shares at end of period:        
Common shares outstanding 196,672hrg_ParticipatingCommonSharesOutstanding 142,801hrg_ParticipatingCommonSharesOutstanding 196,672hrg_ParticipatingCommonSharesOutstanding 142,801hrg_ParticipatingCommonSharesOutstanding
Preferred shares (as-converted basis) 0hrg_ParticipatingPreferredSharesAsConvertedBasis 59,134hrg_ParticipatingPreferredSharesAsConvertedBasis 0hrg_ParticipatingPreferredSharesAsConvertedBasis 59,134hrg_ParticipatingPreferredSharesAsConvertedBasis
Total 196,672hrg_ParticipatingShares 201,935hrg_ParticipatingShares 196,672hrg_ParticipatingShares 201,935hrg_ParticipatingShares
Percentage of income (loss) allocated to:        
Common shares 100.00%hrg_PercentageOfIncomeLossAllocatedToCommonShares 100.00%hrg_PercentageOfIncomeLossAllocatedToCommonShares 100.00%hrg_PercentageOfIncomeLossAllocatedToCommonShares 100.00%hrg_PercentageOfIncomeLossAllocatedToCommonShares
Preferred shares (a) 0.00%hrg_PercentageOfIncomeLossAllocatedToPreferredShares [1] 0.00%hrg_PercentageOfIncomeLossAllocatedToPreferredShares [1] 0.00%hrg_PercentageOfIncomeLossAllocatedToPreferredShares [1] 0.00%hrg_PercentageOfIncomeLossAllocatedToPreferredShares [1]
Net income (loss) attributable to common shares - basic $ (228.3)us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic $ (87.6)us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic $ (338.1)us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic $ (126.6)us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic
Weighted-average common shares outstanding - basic 196,860us-gaap_WeightedAverageNumberOfSharesOutstandingBasic 139,889us-gaap_WeightedAverageNumberOfSharesOutstandingBasic 197,583us-gaap_WeightedAverageNumberOfSharesOutstandingBasic 139,529us-gaap_WeightedAverageNumberOfSharesOutstandingBasic
Net loss per common share attributable to controlling interest:        
Basic (in dollars per share) $ (1.16)us-gaap_EarningsPerShareBasic $ (0.63)us-gaap_EarningsPerShareBasic $ (1.71)us-gaap_EarningsPerShareBasic $ (0.91)us-gaap_EarningsPerShareBasic
Diluted (in dollars per share) $ (1.16)us-gaap_EarningsPerShareDiluted $ (0.63)us-gaap_EarningsPerShareDiluted $ (1.71)us-gaap_EarningsPerShareDiluted $ (0.91)us-gaap_EarningsPerShareDiluted
[1] (a)Losses are not allocated to the convertible participating preferred shares for the period that these shares were outstanding, since they have no contractual obligation to share in such losses.