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Reinsurance - Additional Information (Detail) (USD $) In Millions, unless otherwise specified	Mar. 31, 2015	Sep. 30, 2014	Oct. 31, 2014
Reinsurance Premiums for Insurance Companies, by Product Segment [Line Items]
Contractholder funds	$ 17,521.0us-gaap_PolicyholderFunds	$ 16,463.5us-gaap_PolicyholderFunds
Ability Re [Member]
Reinsurance Premiums for Insurance Companies, by Product Segment [Line Items]
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Assets			368.0us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedAssets / us-gaap_BusinessAcquisitionAxis = hrg_AbilityReMember
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Insurance Reserves			$ 346.9hrg_BusinessCombinationRecognizedIdentifiableAssetsAcquiredandLiabilitiesAssumedInsuranceReserves / us-gaap_BusinessAcquisitionAxis = hrg_AbilityReMember

X

- Definition

Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Insurance Reserves

+ References

No definition available.

+ Details

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X

- Definition

Amount of assets acquired at the acquisition date.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 805

-SubTopic 20

-Section 50

-Paragraph 1

-Subparagraph (c)

-URI http://asc.fasb.org/extlink&oid=56956791&loc=d3e4845-128472

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X

- Definition

The total liability as of the balance sheet date of amounts due policy holders, excluding future policy benefits and claims, including unpaid policy dividends, retrospective refunds, and undistributed earnings on participating business.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 944

-SubTopic 210

-Section S99

-Paragraph 1

-Subparagraph (SX 210.7-03.13,14)

-URI http://asc.fasb.org/extlink&oid=6879938&loc=d3e572229-122910

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