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Investments - Schedule of Allowance for Credit Losses (Detail) (USD $) In Millions, unless otherwise specified | 3 Months Ended
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Dec. 31, 2014 | Dec. 31, 2013
Allowance for credit losses: |  |
Balance at beginning of period | $ 7.2 us-gaap_FinancingReceivableAllowanceForCreditLosses | $ 5.2 us-gaap_FinancingReceivableAllowanceForCreditLosses
Provision for credit losses | 0.3 us-gaap_ProvisionForLoanLeaseAndOtherLosses | 1.8 us-gaap_ProvisionForLoanLeaseAndOtherLosses
Balance at end of period | $ 7.5 us-gaap_FinancingReceivableAllowanceForCreditLosses | $ 7.0 us-gaap_FinancingReceivableAllowanceForCreditLosses

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- Details
Name: | hrg_AllowanceForCreditLossesAbstract
Namespace Prefix: | hrg_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Definition A valuation allowance for financing receivables that are expected to be uncollectible. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 11B -Subparagraph (c)(1) -URI http://asc.fasb.org/extlink&oid=35738203&loc=SL6953423-111524 + Details
Name: | us-gaap_FinancingReceivableAllowanceForCreditLosses
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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- Definition Amount of expense related loan transactions, lease transactions, credit loss from transactions other than loan and lease transactions, and other loss based on assessment of uncollectability from the counterparty to reduce the account to their net realizable value. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3602-108585 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 04 -Paragraph 11 -Article 9 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 225 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-04.11) -URI http://asc.fasb.org/extlink&oid=6879574&loc=d3e536633-122882 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 11B -Subparagraph (c)(2) -URI http://asc.fasb.org/extlink&oid=35738203&loc=SL6953423-111524 + Details
Name: | us-gaap_ProvisionForLoanLeaseAndOtherLosses
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration