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Fair Value of Financial Instruments - Schedule of Unobservable Inputs Used for Level Three Fair Value Measurements of Financial Instruments on Recurring Basis (Detail) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Sep. 30, 2012
Assets
Assets	206,047
Liabilities
Liabilities	1,782,755
Asset-backed securities [Member]
Assets
Assets	15,855
Corporates [Member]
Assets
Assets	103,319
Hybrids [Member]
Assets
Assets	8,873
Commercial mortgage-backed securities [Member]
Assets
Assets	5,023
FIA embedded derivatives, included in contractholder funds [Member]
Liabilities
Liabilities	1,550,805
Equity conversion feature of preferred stock [Member]
Liabilities
Liabilities	231,950
Discounted Cash Flow | FIA embedded derivatives, included in contractholder funds [Member]
Assets
Valuation technique	Discounted cash flow
Broker-quoted | Asset-backed securities [Member]
Assets
Valuation technique	Broker-quoted
Broker-quoted | Corporates [Member]
Assets
Valuation technique	Broker-quoted
Broker-quoted | Hybrids [Member]
Assets
Valuation technique	Broker-quoted
Broker-quoted | Commercial mortgage-backed securities [Member]
Assets
Valuation technique	Broker-quoted
Market Pricing | Corporates [Member]
Assets
Assets	31,977
Valuation technique	Market pricing
Monte Carlo Simulation [Member] | Equity conversion feature of preferred stock [Member]
Assets
Valuation technique	Monte Carlo simulation / Option model
Minimum [Member] | Asset-backed securities [Member]
Assets
Offered quotes	100.00%
Minimum [Member] | Corporates [Member]
Assets
Offered quotes	0.00%
Quoted prices	87.50%
Minimum [Member] | Hybrids [Member]
Assets
Quoted prices	0.00%
Minimum [Member] | FIA embedded derivatives, included in contractholder funds [Member]
Liabilities
Market value of option	0.00%
SWAP rates	0.76%
Mortality multiplier	70.00%
Surrender rates	2.00%
Non-performance spread	0.25%
Minimum [Member] | Equity conversion feature of preferred stock [Member]
Liabilities
Annualized volatility of equity	41.00%
Discount yield	11.50%
Calibration adjustment	10.00%
Maximum [Member] | Asset-backed securities [Member]
Assets
Offered quotes	109.73%
Maximum [Member] | Corporates [Member]
Assets
Offered quotes	140.61%
Quoted prices	158.11%
Maximum [Member] | Hybrids [Member]
Assets
Quoted prices	103.00%
Maximum [Member] | Commercial mortgage-backed securities [Member]
Assets
Offered quotes	100.69%
Maximum [Member] | FIA embedded derivatives, included in contractholder funds [Member]
Liabilities
Market value of option	31.05%
SWAP rates	1.70%
Mortality multiplier	70.00%
Surrender rates	50.00%
Non-performance spread	0.25%
Maximum [Member] | Equity conversion feature of preferred stock [Member]
Liabilities
Discount yield	12.70%
Non-cash accretion rate	0.00%
Calibration adjustment	13.00%
Weighted average [Member] | Asset-backed securities [Member]
Assets
Offered quotes	103.09%
Weighted average [Member] | Corporates [Member]
Assets
Offered quotes	68.47%
Quoted prices	97.89%
Weighted average [Member] | Hybrids [Member]
Assets
Quoted prices	25.35%
Weighted average [Member] | FIA embedded derivatives, included in contractholder funds [Member]
Liabilities
Market value of option	3.55%
SWAP rates	1.22%
Mortality multiplier	70.00%
Surrender rates	7.00%
Non-performance spread	0.25%
Weighted average [Member] | Equity conversion feature of preferred stock [Member]
Liabilities
Discount yield	11.90%
Calibration adjustment	10.90%
Contingent purchase price reduction receivable [Member]
Assets
Assets	41,000
Contingent purchase price reduction receivable [Member] | Discounted Cash Flow
Assets
Valuation technique	Discounted cash flow
Contingent purchase price reduction receivable [Member] | Minimum [Member]
Assets
Probability of collection	88.00%
Contingent purchase price reduction receivable [Member] | Maximum [Member]
Assets
Probability of collection	96.00%
Expected term	9 months
Discount rate	0.72%
Credit insurance risk premium	11.70%
Contingent purchase price reduction receivable [Member] | Weighted average [Member]
Assets
Probability of collection	92.00%

X

- Definition

Fair value inputs market value of option.

+ References

No definition available.

+ Details

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Namespace Prefix:	hrg_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	duration

X

- Definition

Fair value measurements annualized volatility of equity.

+ References

No definition available.

+ Details

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Namespace Prefix:	hrg_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	duration

X

- Definition

Fair value measurements calibration adjustment.

+ References

No definition available.

+ Details

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Namespace Prefix:	hrg_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	duration

X

- Definition

Credit insurance risk premium.

+ References

No definition available.

+ Details

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Namespace Prefix:	hrg_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	duration

X

- Definition

Discount yield.

+ References

No definition available.

+ Details

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Namespace Prefix:	hrg_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	duration

X

- Definition

Mortality multiplier.

+ References

No definition available.

+ Details

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Namespace Prefix:	hrg_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	duration

X

- Definition

Non-cash accretion rate.

+ References

No definition available.

+ Details

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Namespace Prefix:	hrg_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	duration

X

- Definition

Non-performance spread.

+ References

No definition available.

+ Details

Name:	hrg_FairValueMeasurementsNonPerformanceSpread
Namespace Prefix:	hrg_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	duration

X

- Definition

Offered quotes.

+ References

No definition available.

+ Details

Name:	hrg_FairValueMeasurementsOfferedQuotes
Namespace Prefix:	hrg_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	duration

X

- Definition

Fair value measurements probability of collection.

+ References

No definition available.

+ Details

Name:	hrg_FairValueMeasurementsProbabilityOfCollection
Namespace Prefix:	hrg_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	duration

X

- Definition

Fair value measurements quoted prices.

+ References

No definition available.

+ Details

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Namespace Prefix:	hrg_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	duration

X

- Definition

Surrender rates.

+ References

No definition available.

+ Details

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Namespace Prefix:	hrg_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	duration

X

- Definition

Fair value measurements swap rates.

+ References

No definition available.

+ Details

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Namespace Prefix:	hrg_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	duration

X

- Definition

This element represents the aggregate of the assets reported on the balance sheet at period end measured at fair value by the entity. This element is intended to be used in connection with the fair value disclosures required in the footnote disclosures to the financial statements.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 820

-SubTopic 10

-Section 50

-Paragraph 2

-Subparagraph (a)

-URI http://asc.fasb.org/extlink&oid=7578670&loc=d3e19207-110258

+ Details

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Balance Type:	debit
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X

- Details

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Balance Type:	na
Period Type:	duration

X

- Definition

Period the instrument, asset or liability is expected to be outstanding, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 820

-SubTopic 10

-Section 50

-Paragraph 2

-Subparagraph (e)

-URI http://asc.fasb.org/extlink&oid=7578670&loc=d3e19207-110258

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Period Type:	duration

X

- Definition

Interest rate used to find the present value of an amount to be paid or received in the future as an input to measure fair value. For example, but not limited to, weighted average cost of capital (WACC), cost of capital, cost of equity and cost of debt.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 820

-SubTopic 10

-Section 50

-Paragraph 2

-Subparagraph (bbb)

-URI http://asc.fasb.org/extlink&oid=7578670&loc=d3e19207-110258

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X

- Definition

Description of the inputs and valuation technique(s) used to measure fair value.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 820

-SubTopic 10

-Section 50

-Paragraph 2

-Subparagraph (bbb)

-URI http://asc.fasb.org/extlink&oid=7578670&loc=d3e19207-110258

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X

- Definition

This element represents the aggregate of the liabilities reported on the balance sheet at period end measured at fair value by the entity. This element is intended to be used in connection with the fair value disclosures required in the footnote disclosures to the financial statements.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 820

-SubTopic 10

-Section 50

-Paragraph 2

-Subparagraph (a)

-URI http://asc.fasb.org/extlink&oid=7578670&loc=d3e19207-110258

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Balance Type:	credit
Period Type:	instant

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