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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
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Dec. 31, 2014 | Dec. 31, 2013
Earnings Per Share [Abstract] |  |
Net income (loss) attributable to common and participating preferred stockholders | $ (109.8)hrg_NetIncomeLossAttributableToCommonAndParticipatingPreferredStockholders | $ (39.0)hrg_NetIncomeLossAttributableToCommonAndParticipatingPreferredStockholders
Participating shares at end of period: |  |
Common shares outstanding | 196,879 hrg_ParticipatingCommonSharesOutstanding | 139,574 hrg_ParticipatingCommonSharesOutstanding
Preferred shares (as-converted basis) | 0 hrg_ParticipatingPreferredSharesAsConvertedBasis | 61,986 hrg_ParticipatingPreferredSharesAsConvertedBasis
Total | 196,879 hrg_ParticipatingShares | 201,560 hrg_ParticipatingShares
Percentage of income (loss) allocated to: |  |
Common shares | 100.00%hrg_PercentageOfIncomeLossAllocatedToCommonShares | 100.00%hrg_PercentageOfIncomeLossAllocatedToCommonShares
Preferred shares (a) | 0.00%hrg_PercentageOfIncomeLossAllocatedToPreferredShares | 0.00%hrg_PercentageOfIncomeLossAllocatedToPreferredShares
Net income (loss) attributable to common shares - basic | $ (109.8)us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic | $ (39.0)us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic
Weighted-average common shares outstanding - basic | 196,997 us-gaap_WeightedAverageNumberOfSharesOutstandingBasic | 139,173 us-gaap_WeightedAverageNumberOfSharesOutstandingBasic
Net loss per common share attributable to controlling interest: |  |
Basic (in dollars per share) | $ (0.56)us-gaap_EarningsPerShareBasic | $ (0.28)us-gaap_EarningsPerShareBasic
Diluted (in dollars per share) | $ (0.56)us-gaap_EarningsPerShareDiluted | $ (0.28)us-gaap_EarningsPerShareDiluted

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- Definition The amount of net income (loss) for the period per each share of common stock or unit outstanding during the reporting period. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 260 -SubTopic 10 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6371337&loc=d3e3550-109257 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 260 -SubTopic 10 -Section 45 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=7655603&loc=d3e1252-109256 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 260 -SubTopic 10 -Section 55 -Paragraph 52 -URI http://asc.fasb.org/extlink&oid=32703322&loc=d3e4984-109258 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 225 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SX 210.5-03.21) -URI http://asc.fasb.org/extlink&oid=26872669&loc=d3e20235-122688 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 225 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-04.19) -URI http://asc.fasb.org/extlink&oid=6879464&loc=d3e573970-122913 Reference 6: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 225 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-04.23) -URI http://asc.fasb.org/extlink&oid=6879574&loc=d3e536633-122882 Reference 7: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 04 -Paragraph 18 -Article 7 Reference 8: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 03 -Paragraph 20 -Article 5 Reference 9: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 04 -Paragraph 21 -Article 9 + Details
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