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Stock Compensation - Assumptions Used in Determination of Grant Date Fair Values Using Black-Scholes Option Pricing Model (Detail) | 12 Months Ended | 6 Months Ended | 12 Months Ended | 6 Months Ended | 12 Months Ended | 6 Months Ended | 12 Months Ended | 6 Months Ended
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Sep. 30, 2013 FGLH | Sep. 30, 2012 FGLH | Sep. 30, 2012 HGI Minimum | Mar. 31, 2014 FGL Minimum | Sep. 30, 2014 FGL Minimum | Sep. 30, 2013 FGL Minimum | Mar. 31, 2014 FGL Maximum | Mar. 31, 2013 FGL Maximum | Sep. 30, 2012 FGLH [Member] Minimum | Sep. 30, 2014 Employee Stock Option HGI | Sep. 30, 2013 Employee Stock Option HGI | Sep. 30, 2012 Employee Stock Option HGI | Sep. 30, 2014 Employee Stock Option HGI Minimum | Sep. 30, 2013 Employee Stock Option HGI Minimum | Sep. 30, 2012 Employee Stock Option HGI Minimum | Sep. 30, 2014 Employee Stock Option HGI Maximum | Sep. 30, 2013 Employee Stock Option HGI Maximum | Sep. 30, 2012 Employee Stock Option HGI Maximum | Sep. 30, 2014 Employee Stock Option FGL Minimum | Sep. 30, 2013 Employee Stock Option FGL Minimum | Mar. 31, 2014 Employee Stock Option FGL Maximum | Mar. 31, 2013 Employee Stock Option FGL Maximum | Sep. 30, 2012 Employee Stock Option FGLH [Member] Minimum | Mar. 31, 2012 Employee Stock Option FGLH [Member] Maximum
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Risk-free interest rate |  |  |  |  |  |  |  |  |  |  |  |  | 1.365% | 0.84% | 0.97% | 1.703% | 1.86% | 1.19% | 1.40% | 0.80% | 1.41% |  | 0.80% |
Assumed dividend yield | 6.00% | 10.00% |  | 1.00% |  |  | 1.50% |  |  | 0.00% | 0.00% | 0.00% |  |  |  |  |  |  |  |  |  |  |  |
Expected option term |  |  | 6 years 0 months 0 days |  | 4 years 6 months | 4 years 6 months |  |  | 4 years 6 months |  |  |  | 5 years 0 months 0 days | 5 years 3 months 18 days |  | 5 years 10 months 24 days | 6 years 2 months 12 days |  |  |  |  |  |  |
Volatility |  |  |  |  |  |  |  |  |  |  |  |  | 37.76% | 41.90% | 33.00% | 39.75% | 44.00% | 35.50% | 25.00% | 27.00% |  |  | 35.00% |

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- Definition 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. + 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)(iii) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition 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 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -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 + Details
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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) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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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) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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