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Fair Value of Financial Instruments - Additional Information (Detail) (USD $) In Thousands, unless otherwise specified | 12 Months Ended
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Sep. 30, 2012 | Sep. 30, 2011
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |
Percentage of male contract holder | 50.00% |
Percentage of female contract holder | 50.00% |
Asset Backed Securities Corporate Debt Securities Hybrids And Municipals [Member] |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |
Net transfer out of Level 3 related to non-agency residential mortgage-backed securities and corporate securities | $ 794,012 |
Asset Backed Securities Corporate Debt Securities And Hybrid [Member] |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |
Net transfer out of Level 3 related to non-agency residential mortgage-backed securities and corporate securities |  | 17,703
Net transfer in to Level 3 related to asset-backed securities, corporates and municipal securities | $ 3,712 |

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- Definition Transfers into assets measured at fair value and categorized within Level 3 of the fair value hierarchy that have taken place during the period. + 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 (c)(3) -URI http://asc.fasb.org/extlink&oid=7578670&loc=d3e19207-110258 + Details
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- Definition Transfers out of assets measured at fair value and categorized within Level 3 of the fair value hierarchy that have taken place during the period. + 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 (c)(3) -URI http://asc.fasb.org/extlink&oid=7578670&loc=d3e19207-110258 + Details
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