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Segment Data - Additional Information (Detail) (USD $) In Millions, unless otherwise specified | 3 Months Ended | 6 Months Ended
--- | --- | ---
Mar. 31, 2015 | Mar. 31, 2014 | Mar. 31, 2015 Segment | Mar. 31, 2014
Segment Reporting Information [Line Items] |  |  |  |
Asset Impairment Charges | $ 249.3 us-gaap_AssetImpairmentCharges | $ 81.0 us-gaap_AssetImpairmentCharges | 499.5 us-gaap_AssetImpairmentCharges | $ 82.8 us-gaap_AssetImpairmentCharges
Number of reporting segments |  |  | 4 us-gaap_NumberOfReportableSegments |
Insurance Segment [Member] |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Asset Impairment Charges |  |  | 42.4 us-gaap_AssetImpairmentCharges / us-gaap_StatementBusinessSegmentsAxis = hrg_InsuranceSegmentMember |
Asset Management segment [Member] |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Asset Impairment Charges |  |  | 62.6 us-gaap_AssetImpairmentCharges / us-gaap_StatementBusinessSegmentsAxis = hrg_AssetManagementsegmentMember |
Radioshack [Member] | Insurance Segment [Member] |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Asset Impairment Charges |  |  | 40.0 us-gaap_AssetImpairmentCharges / us-gaap_CounterpartyNameAxis = hrg_RadioshackMember / us-gaap_StatementBusinessSegmentsAxis = hrg_InsuranceSegmentMember |
Radioshack [Member] | Asset Management segment [Member] |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Asset Impairment Charges |  |  | 24.8 us-gaap_AssetImpairmentCharges / us-gaap_CounterpartyNameAxis = hrg_RadioshackMember / us-gaap_StatementBusinessSegmentsAxis = hrg_AssetManagementsegmentMember |

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- Definition Amount of write-down of assets recognized in the income statement. Includes, but is not limited to, losses from tangible assets, intangible assets and goodwill. + 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 (b) -URI http://asc.fasb.org/extlink&oid=56944662&loc=d3e3602-108585 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 360 -SubTopic 10 -Section 45 -Paragraph 4 -URI http://asc.fasb.org/extlink&oid=51824106&loc=d3e2420-110228 + Details
Name: | us-gaap_AssetImpairmentCharges
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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- Definition Number of segments reported by the entity. A reportable segment is a component of an entity for which there is an accounting requirement to report separate financial information on that component in the entity's financial statements. + References No definition available. + Details
Name: | us-gaap_NumberOfReportableSegments
Namespace Prefix: | us-gaap_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | duration

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- Details
Name: | us-gaap_SegmentReportingInformationLineItems
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Details
Name: | us-gaap_CounterpartyNameAxis=hrg_RadioshackMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_StatementBusinessSegmentsAxis=hrg_AssetManagementsegmentMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_StatementBusinessSegmentsAxis=hrg_InsuranceSegmentMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |