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Significant Risks and Uncertainties - Additional Information (Detail) (USD $) In Thousands, unless otherwise specified | 12 Months Ended
--- | ---
Sep. 30, 2012 | Sep. 30, 2011 | Sep. 30, 2010
Unusual Risk or Uncertainty [Line Items] |  |  |
FGL's investment securities in the banking industry with a fair value | 1,081,955 | 2,126,380 |
Percentage of invested assets portfolio | 6.00% | 13.00% |
Number of issuers in investments | 8 | 19 |
Number of holdings on investment securities | 10 |  |
Percentage of total holdings in industry | 36.00% |  |
Stockholders' equity exceeded percentage | 10.00% | 10.00% |
Wilton Reassurance Company [Member] |  |  |
Unusual Risk or Uncertainty [Line Items] |  |  |
Net amount recoverable from Wilton Re | 1,317,114 |  |
Sub-prime [Member] |  |  |
Unusual Risk or Uncertainty [Line Items] |  |  |
Exposure of FGL's invested assets | 233,318 |  |
Exposure of FGL's invested assets | 1.00% |  |
Agency residential mortgage-backed securities [Member] |  |  |
Unusual Risk or Uncertainty [Line Items] |  |  |
Exposure of FGL's invested assets | 121,629 |  |
Exposure of FGL's invested assets | 1.00% |  |
Concentrations of Financial and Capital Markets Risk [Member] |  |  |
Unusual Risk or Uncertainty [Line Items] |  |  |
FGL's investment securities in the banking industry with a fair value | 2,000,355 |  |
Percentage of invested assets portfolio | 12.00% |  |
Number of issuers in investments | 118 |  |
Single issuer [Member] |  |  |
Unusual Risk or Uncertainty [Line Items] |  |  |
FGL's investment securities in the banking industry with a fair value | 152,876 | 159,265 |
Percentage of invested assets portfolio | 1.00% | 1.00% |
Concentrations of Risk and Major Customers [Member] |  |  |
Unusual Risk or Uncertainty [Line Items] |  |  |
Percentage of net sales from major customer | 23.00% | 24.00% | 22.00%
Percentage of trade account receivables from major customers | 13.00% | 16.00% |
Net sales from outside of the United States | 46.00% | 44.00% | 44.00%

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- Definition The net amount (to the extent disclosed within this portion of the income statement) by which an insurance settlement exceeds incremental costs incurred from the event causing an interruption of business, plus the insurance award for earnings lost from the event, such as a natural catastrophe, explosion or fire. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 225 -SubTopic 30 -Section 50 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=6365675&loc=d3e16285-107787 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Emerging Issues Task Force (EITF) -Number 01-13 -Paragraph 7 -Subparagraph b -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. + Details
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