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Investments - Net Investment Income (Detail) (USD $) In Thousands, unless otherwise specified | 12 Months Ended
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Sep. 30, 2012 | Sep. 30, 2011
Schedule of Investments [Line Items] |  |
Gross investment income | $ 734,462 | $ 376,927
External investment expense | (11,729) | (7,087)
Net investment income | 722,733 | 369,840
Fixed maturity available-for-sale securities [Member] |  |
Schedule of Investments [Line Items] |  |
Gross investment income | 707,132 | 364,771
Equity available-for-sale securities [Member] |  |
Schedule of Investments [Line Items] |  |
Gross investment income | 13,966 | 10,190
Invested cash and short-term investments [Member] |  |
Schedule of Investments [Line Items] |  |
Gross investment income | 4,921 | 129
Policy loans [Member] |  |
Schedule of Investments [Line Items] |  |
Gross investment income | 707 | 1,511
Other investments [Member] |  |
Schedule of Investments [Line Items] |  |
Gross investment income | $ 7,736 | $ 326

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- Definition Gross investment income. + References No definition available. + Details
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- Definition Income derived from investments in debt and equity securities and on cash and cash equivalents. Interest income represents earnings which reflect the time value of money or transactions in which the payments are for the use or forbearance of money. Dividend income represents a distribution of earnings to shareholders by investee companies. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 115 -Paragraph 14 -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009.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. Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 225 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SX 210.5-03.7(a),(b)) -URI http://asc.fasb.org/extlink&oid=6880815&loc=d3e20235-122688 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 03 -Paragraph 7 -Subparagraph a, b -Article 5 + Details
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