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Fair Value of Financial Instruments - Changes in Fair Value of Financial Instruments (Detail) (USD $) In Thousands, unless otherwise specified | 12 Months Ended
--- | ---
Sep. 30, 2012 | Sep. 30, 2011
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |  |  |
Balance at Beginning of Period | $ 546,478 |  | $ 627,635 |
Total Gains (Losses) Included in Earnings | 40,900 |  | 4,357 |
Total Gains (Losses) Included in AOCI | 3,767 |  | 6,630 |
Net Purchases, Sales & Settlements | 346,609 |  | (74,441) |
Net Transfer in (Out) of Level 3 | (731,707) | [1] | (17,703) | [1]
Balance at End of Period | 206,047 |  | 546,478 |
Balance at Beginning of Period | (1,472,090) |  | (1,466,727) |
Total Gains (Losses) Included in Earnings | (310,665) |  | 97,897 |
Total Gains (Losses) Included in AOCI |  |  |  |
Net Purchases, Sales & Settlements |  |  | (103,260) |
Net Transfer In (Out) of Level 3 |  |  |  | [1]
Balance at End of Period | (1,782,755) |  | (1,472,090) |
Asset-backed securities [Member] |  |  |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |  |  |
Balance at Beginning of Period | 374,518 |  | 399,967 |
Total Gains (Losses) Included in AOCI | 7,355 |  | 863 |
Net Purchases, Sales & Settlements | 371,896 |  | (11,709) |
Net Transfer in (Out) of Level 3 | (737,914) | [1] | (14,603) | [1]
Balance at End of Period | 15,855 |  | 374,518 |
Commercial mortgage-backed securities [Member] |  |  |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |  |  |
Total Gains (Losses) Included in AOCI | 24 |  |  |
Net Purchases, Sales & Settlements | 4,999 |  |  |
Balance at End of Period | 5,023 |  |  |
Corporates [Member] |  |  |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |  |  |
Balance at Beginning of Period | 159,684 |  | 197,573 |
Total Gains (Losses) Included in Earnings | 28 |  | 1,993 |
Total Gains (Losses) Included in AOCI | (3,662) |  | 5,408 |
Net Purchases, Sales & Settlements | (39,686) |  | (45,229) |
Net Transfer in (Out) of Level 3 | 18,932 | [1] | (61) | [1]
Balance at End of Period | 135,296 |  | 159,684 |
Hybrids [Member] |  |  |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |  |  |
Balance at Beginning of Period | 5,205 |  | 8,305 |
Total Gains (Losses) Included in AOCI | (44) |  | (61) |
Net Transfer in (Out) of Level 3 | 3,712 | [1] | (3,039) | [1]
Balance at End of Period | 8,873 |  | 5,205 |
Municipals [Member] |  |  |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |  |  |
Total Gains (Losses) Included in Earnings | (2) |  |  |
Total Gains (Losses) Included in AOCI | 72 |  |  |
Net Purchases, Sales & Settlements | 10,177 |  |  |
Net Transfer in (Out) of Level 3 | (10,247) | [1] |  |
Non-agency residential mortgage-backed securities [Member] |  |  |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |  |  |
Balance at Beginning of Period | 3,759 |  | 18,519 |
Total Gains (Losses) Included in Earnings | (126) |  | 2,364 |
Total Gains (Losses) Included in AOCI | 4 |  | 379 |
Net Purchases, Sales & Settlements | (777) |  | (17,503) |
Net Transfer in (Out) of Level 3 | (2,860) | [1] |  |
Balance at End of Period |  |  | 3,759 |
Contingent purchase price reduction receivable [Member] |  |  |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |  |  |
Total Gains (Losses) Included in Earnings | 41,000 |  |  |
Balance at End of Period | 41,000 |  |  |
Agency residential mortgage-backed securities [Member] |  |  |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |  |  |
Balance at Beginning of Period | 3,312 |  | 3,271 |
Total Gains (Losses) Included in AOCI | 18 |  | 41 |
Net Transfer in (Out) of Level 3 | (3,330) | [1] |  |
Balance at End of Period |  |  | 3,312 |
FIA embedded derivatives, included in contractholder funds [Member] |  |  |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |  |  |
Balance at Beginning of Period | (1,396,340) |  | (1,466,308) |
Total Gains (Losses) Included in Earnings | (154,465) |  | 69,968 |
Total Gains (Losses) Included in AOCI |  |  |  |
Net Purchases, Sales & Settlements |  |  |  |
Net Transfer In (Out) of Level 3 |  |  |  | [1]
Balance at End of Period | (1,550,805) |  | (1,396,340) |
Available-for-sale embedded derivatives [Member] |  |  |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |  |  |
Balance at Beginning of Period | (400) |  | (419) |
Total Gains (Losses) Included in Earnings | 400 |  | 19 |
Total Gains (Losses) Included in AOCI |  |  |  |
Net Purchases, Sales & Settlements |  |  |  |
Net Transfer In (Out) of Level 3 |  |  |  | [1]
Balance at End of Period |  |  | (400) |
Equity conversion feature of preferred stock [Member] |  |  |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |  |  |
Balance at Beginning of Period | (75,350) |  |  |
Total Gains (Losses) Included in Earnings | (156,600) |  | 27,910 |
Total Gains (Losses) Included in AOCI |  |  |  |
Net Purchases, Sales & Settlements |  |  | (103,260) |
Net Transfer In (Out) of Level 3 |  |  |  | [1]
Balance at End of Period | $ (231,950) |  | $ (75,350) |
[1] | The net transfers in and out of Level 3 during the year ended September 30, 2012 were exclusively to or from Level 2.

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- Definition Amount of purchases, sales, issues, and settlements (net) which have taken place in relation to assets measured at fair value on a recurring basis using unobservable inputs (level 3). + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 157 -Paragraph 32 -Subparagraph c(2) -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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- Definition Amount of gain (loss) recognized in other comprehensive income, arising from liabilities measured at fair value on a recurring basis using unobservable inputs (level 3). + 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)(1a) -URI http://asc.fasb.org/extlink&oid=7578670&loc=d3e19207-110258 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 157 -Paragraph 32 -Subparagraph c(1) -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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