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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 Millions, unless otherwise specified	3 Months Ended	12 Months Ended
	Dec. 30, 2012	Sep. 30, 2012
Assets
Assets	313.5	206.0
Assets	313.5	206.0
Liabilities	1,680.1	1,782.8
Asset-backed securities [Member]
Assets
Assets	5.3	15.9
Assets	5.3	15.9
Commercial mortgage-backed securities [Member]
Assets
Assets	6.1	5.0
Assets	6.1	5.0
Corporates [Member]
Assets
Assets	32.7	32.0
Assets	32.7	32.0
Hybrids [Member]
Assets
Assets	5.0
Assets	5.0
Broker-quoted [Member] | Asset-backed securities [Member]
Assets
Valuation Technique	Broker-quoted
Broker-quoted [Member] | Commercial mortgage-backed securities [Member]
Assets
Valuation Technique	Market pricing
Broker-quoted [Member] | Corporates [Member]
Assets
Valuation Technique	Broker-quoted
Broker-quoted [Member] | Hybrids [Member]
Assets
Valuation Technique	Market pricing
Market pricing [Member] | Corporates [Member]
Assets
Assets	223.4	103.3
Assets	223.4	103.3
Valuation Technique	Broker-quoted
Market pricing [Member] | Hybrids [Member]
Assets
Assets		8.8
Assets		8.8
Valuation Technique	Broker-quoted
Contingent purchase price reduction receivable [Member]
Assets
Assets	41.0	41.0
Assets	41.0	41.0
Contingent purchase price reduction receivable [Member] | Discounted cash flow [Member]
Assets
Valuation Technique	Discounted cash flow
FIA embedded derivatives, included in contractholder funds [Member]
Assets
Liabilities	1,517.0	1,550.8
FIA embedded derivatives, included in contractholder funds [Member] | Discounted cash flow [Member]
Assets
Valuation Technique	Discounted cash flow
Equity conversion feature of preferred stock [Member]
Assets
Liabilities	163.1	232.0
Equity conversion feature of preferred stock [Member] | Monte Carlo simulation / Option model [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
Quoted prices	0.00%	0.00%
Offered quotes	88.00%	88.00%
Minimum [Member] | Hybrids [Member]
Assets
Quoted prices		0.00%
Minimum [Member] | Contingent purchase price reduction receivable [Member]
Assets
Probability of collection	88.00%	88.00%
Minimum [Member] | FIA embedded derivatives, included in contractholder funds [Member]
Assets
Market value of option	0.00%	0.00%
SWAP rates	0.86%	0.76%
Surrender rates	0.50%	2.00%
Non-performance spread	0.25%	0.25%
Minimum [Member] | Equity conversion feature of preferred stock [Member]
Assets
Annualized volatility of equity	44.00%	41.00%
Discount yield	11.00%	12.00%
Calibration adjustment	17.00%	10.00%
Maximum [Member] | Asset-backed securities [Member]
Assets
Offered quotes	109.00%	110.00%
Maximum [Member] | Commercial mortgage-backed securities [Member]
Assets
Offered quotes		101.00%
Maximum [Member] | Corporates [Member]
Assets
Quoted prices	149.00%	141.00%
Offered quotes	149.00%	158.00%
Maximum [Member] | Hybrids [Member]
Assets
Quoted prices		103.00%
Maximum [Member] | Contingent purchase price reduction receivable [Member]
Assets
Probability of collection	96.00%	96.00%
Expected term	9 months	9 months
Discount rate	0.62%	0.72%
Credit insurance risk premium	12.00%	12.00%
Maximum [Member] | FIA embedded derivatives, included in contractholder funds [Member]
Assets
Market value of option	30.00%	31.00%
SWAP rates	2.00%	2.00%
Mortality multiplier	80.00%	70.00%
Surrender rates	75.00%	50.00%
Non-performance spread	0.25%	0.25%
Maximum [Member] | Equity conversion feature of preferred stock [Member]
Assets
Discount yield		13.00%
Non-cash accretion rate	0.00%	0.00%
Calibration adjustment	19.00%	13.00%
Weighted average [Member] | Asset-backed securities [Member]
Assets
Offered quotes		103.00%
Weighted average [Member] | Commercial mortgage-backed securities [Member]
Assets
Offered quotes	102.00%
Weighted average [Member] | Corporates [Member]
Assets
Quoted prices	80.00%	69.00%
Offered quotes	95.00%	98.00%
Weighted average [Member] | Hybrids [Member]
Assets
Quoted prices		25.00%
Offered quotes	100.00%
Weighted average [Member] | Contingent purchase price reduction receivable [Member]
Assets
Probability of collection	92.00%	92.00%
Weighted average [Member] | FIA embedded derivatives, included in contractholder funds [Member]
Assets
Market value of option	2.00%	4.00%
SWAP rates	1.00%	1.00%
Surrender rates	7.00%	7.00%
Non-performance spread	0.25%	0.25%
Weighted average [Member] | Equity conversion feature of preferred stock [Member]
Assets
Discount yield		12.00%
Calibration adjustment	18.00%	11.00%

X

- Definition

Fair value inputs market value of option.

+ References

No definition available.

+ Details

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Namespace Prefix:	hrg_
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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

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

X

- Definition

Offered quotes.

+ 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 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
Period Type:	instant

X

- Details

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Data Type:	xbrli:stringItemType
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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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Data Type:	xbrli:durationItemType
Balance Type:	na
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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Namespace Prefix:	us-gaap_
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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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Data Type:	xbrli:monetaryItemType
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