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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	$ 249.3us-gaap_AssetImpairmentCharges	$ 81.0us-gaap_AssetImpairmentCharges	499.5us-gaap_AssetImpairmentCharges	$ 82.8us-gaap_AssetImpairmentCharges
Number of reporting segments			4us-gaap_NumberOfReportableSegments
Insurance Segment [Member]
Segment Reporting Information [Line Items]
Asset Impairment Charges			42.4us-gaap_AssetImpairmentCharges / us-gaap_StatementBusinessSegmentsAxis = hrg_InsuranceSegmentMember
Asset Management segment [Member]
Segment Reporting Information [Line Items]
Asset Impairment Charges			62.6us-gaap_AssetImpairmentCharges / us-gaap_StatementBusinessSegmentsAxis = hrg_AssetManagementsegmentMember
Radioshack [Member] | Insurance Segment [Member]
Segment Reporting Information [Line Items]
Asset Impairment Charges			40.0us-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			24.8us-gaap_AssetImpairmentCharges / us-gaap_CounterpartyNameAxis = hrg_RadioshackMember / us-gaap_StatementBusinessSegmentsAxis = hrg_AssetManagementsegmentMember

X

- 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

X

- 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

X

- Details

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

X

- 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: