The estimated dividend rate (a percentage of the share price) to be paid (expected dividends) to holders of the underlying shares over the option's term.

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 718

-SubTopic 10

-Section 50

-Paragraph 2

-Subparagraph (f)(2)(iii)

-URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901

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- Definition

The estimated measure of the percentage by which a share price is expected to fluctuate during a period. Volatility also may be defined as a probability-weighted measure of the dispersion of returns about the mean. The volatility of a share price is the standard deviation of the continuously compounded rates of return on the share over a specified period. That is the same as the standard deviation of the differences in the natural logarithms of the stock prices plus dividends, if any, over the period.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 718

-SubTopic 10

-Section 50

-Paragraph 2

-Subparagraph (f)(2)(ii)

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- Definition

The risk-free interest rate assumption that is used in valuing an option on its own shares.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 718

-SubTopic 10

-Section 50

-Paragraph 2

-Subparagraph (f)(2)(iv)

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Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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- Definition

Price of a single share of a number of saleable stocks of a company.

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Expected term of share-based compensation awards, 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 718

-SubTopic 10

-Section S99

-Paragraph 1

-Subparagraph (SAB TOPIC 14.D.2)

-URI http://asc.fasb.org/extlink&oid=27013229&loc=d3e301413-122809

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-Name Accounting Standards Codification

-Topic 718

-SubTopic 10

-Section 50

-Paragraph 2

-Subparagraph (f)(2)(i)

-URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901

Reference 3: http://www.xbrl.org/2003/role/presentationRef

-Publisher SEC

-Name Staff Accounting Bulletin (SAB)

-Number Topic 14

-Section D

-Subsection 2

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Weighted average grant-date fair value of options vested.

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Stock Compensation - Assumptions Used in Determination of Grant Date Fair Values Using Black-Scholes Option Pricing Model (Detail) - $ / shares	6 Months Ended		12 Months Ended
	Mar. 31, 2013	Mar. 31, 2012	Sep. 30, 2015	Sep. 30, 2014	Sep. 30, 2013
FGL
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share-based Compensation Arrangement by Share-based Payment Award, Options, Vested, Weighted Average Grant Date Fair Value			$ 4.96	$ 3.76	$ 3.85
Expected option term			4 years 6 months	4 years 6 months
FGL \| Maximum
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Expected option term
Fidelity And Guaranty Life Holdings
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Assumed dividend yield					6.00%
FGLH [Member] \| Minimum [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Expected option term					4 years 6 months
Employee Stock Option \| HGI
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Assumed dividend yield			0.00%	0.00%	0.00%
Employee Stock Option \| FGL
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share Price			$ 24.54	$ 21.35
Employee Stock Option \| Fidelity And Guaranty Life Holdings
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share-based Compensation Arrangement by Share-based Payment Award, Options, Vested, Weighted Average Grant Date Fair Value			74.99	50.63
Share Price			$ 122.02	$ 98.28
Assumed dividend yield			1.16%	1.20%
Volatility			25.00%	25.00%
Employee Stock Option \| Fidelity And Guaranty Life Holdings \| Minimum [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Risk-free interest rate			0.48%	0.65%
Expected option term			1 year 6 months	2 years
Employee Stock Option \| Fidelity And Guaranty Life Holdings \| Maximum
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Risk-free interest rate			0.74%	1.02%
Expected option term			2 years 3 months	2 years 9 months
Employee Stock Option \| HGI \| Minimum [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Risk-free interest rate			1.57%	1.37%	0.84%
Expected option term			5 years	5 years	5 years 4 months
Volatility			36.30%	37.80%	41.90%
Employee Stock Option \| HGI \| Maximum
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Risk-free interest rate			1.87%	1.70%	1.86%
Expected option term			6 years 6 months	5 years 10 months 24 days	6 years 2 months
Volatility			38.99%	39.80%	44.00%
Employee Stock Option \| FGL
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Volatility			25.00%	25.00%
Employee Stock Option \| FGL \| Minimum [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Risk-free interest rate			1.41%	1.40%	0.80%
Assumed dividend yield			1.18%	1.30%
Employee Stock Option \| FGL \| Maximum
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Risk-free interest rate			1.50%	1.41%
Assumed dividend yield			1.19%	1.50%
Volatility
Employee Stock Option \| FGLH [Member] \| Minimum [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Volatility					27.00%
Employee Stock Option \| FGLH [Member] \| Maximum
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Volatility
Chief Executive Officer [Member] \| FGL
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Assumed dividend yield			1.20%
Expected option term			9 months
Chief Executive Officer [Member] \| Employee Stock Option \| FGL
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Volatility			25.00%
Chief Executive Officer [Member] \| Employee Stock Option \| FGL \| Minimum [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share-based Compensation Arrangement by Share-based Payment Award, Options, Vested, Weighted Average Grant Date Fair Value			$ 0
Risk-free interest rate			0.20%