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Fair Value of Financial Instruments - Changes in Fair Value of Financial Instruments (Detail) (USD $) | 12 Months Ended
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Sep. 30, 2014 | Sep. 30, 2013 | Sep. 30, 2012
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |  |  |  |  |
Fair Value Assets, level 1 to level 2 transfers | $ 0 |  | $ 0 |  | $ 0 |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward] |  |  |  |  |  |
Balance at Beginning of Period | 523,500,000 |  | 206,000,000 |  | 546,500,000 |
Total Gains (Losses) Included in Earnings | 1,700,000 |  | (100,000) |  | 40,900,000 |
Total Gains (Losses) Included in AOCI | 22,200,000 |  | (14,000,000) |  | 3,800,000 |
Purchases | 570,500,000 |  | 428,200,000 |  | 427,200,000 |
Sales | (12,100,000) |  | (20,300,000) |  | (27,300,000) |
Settlements | (15,900,000) |  | (23,300,000) |  | (53,300,000) |
Net transfer In (Out) of Level 3 (a) | (23,900,000) |  | (53,000,000) |  | (731,800,000) | [1]
Balance at End of Period | 1,066,000,000 |  | 523,500,000 |  | 206,000,000 |
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward] |  |  |  |  |  |
Balance at Beginning of Period | 1,875,200,000 |  | 1,782,800,000 |  | 1,472,100,000 |
Total Gains (Losses) Included in Earnings | 383,400,000 |  | 95,200,000 |  | 310,700,000 |
Total Gains (Losses) Included in AOCI |  |  |  |  |  |
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Liability, Purchases | 150,600,000 |  |  |  |  |
Sales |  |  |  |  |  |
Settlements | (349,800,000) |  | (2,800,000) |  |  |
Net transfer In (Out) of Level 3 |  | [2] |  |  |  |
Balance at End of Period | 2,059,400,000 |  | 1,875,200,000 |  | 1,782,800,000 |
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset Transfers Into Level 3 | 0 |  | 30,900,000 | [3] |  |
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Liability, Purchases, (Sales), Issuances, (Settlements) |  |  |  |  | 0 |
FIA embedded derivatives, included in contractholder funds |  |  |  |  |  |
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward] |  |  |  |  |  |
Balance at Beginning of Period | 1,544,400,000 |  | 1,550,800,000 |  | 1,396,300,000 |
Total Gains (Losses) Included in Earnings | 363,700,000 |  | (6,400,000) |  | 154,500,000 |
Total Gains (Losses) Included in AOCI |  |  |  |  |  |
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Liability, Purchases |  |  |  |  |  |
Sales |  |  |  |  |  |
Settlements |  |  |  |  |  |
Net transfer In (Out) of Level 3 |  |  |  |  |  |
Balance at End of Period | 1,908,100,000 |  | 1,544,400,000 |  | 1,550,800,000 |
Front Street Future Policyholder Benefits Reserve [Member] |  |  |  |  |  |
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward] |  |  |  |  |  |
Balance at Beginning of Period |  |  |  |  |  |
Total Gains (Losses) Included in Earnings | 7,000,000 |  |  |  |  |
Total Gains (Losses) Included in AOCI |  |  |  |  |  |
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Liability, Purchases | 150,600,000 |  |  |  |  |
Sales |  |  |  |  |  |
Settlements | (6,300,000) |  |  |  |  |
Net transfer In (Out) of Level 3 |  |  |  |  |  |
Balance at End of Period | 151,300,000 |  |  |  |  |
Equity conversion feature of preferred stock |  |  |  |  |  |
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward] |  |  |  |  |  |
Balance at Beginning of Period | 330,800,000 |  | 232,000,000 |  | 75,400,000 |
Total Gains (Losses) Included in Earnings | 12,700,000 |  | 101,600,000 |  | 156,600,000 |
Total Gains (Losses) Included in AOCI |  |  |  |  |  |
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Liability, Purchases |  |  |  |  |  |
Sales |  |  |  |  |  |
Settlements | (343,500,000) |  | (2,800,000) |  |  |
Net transfer In (Out) of Level 3 |  |  |  |  |  |
Balance at End of Period |  |  | 330,800,000 |  | 232,000,000 |
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Liability, Purchases, (Sales), Issuances, (Settlements) |  |  |  |  | 0 |
Available-for-sale embedded derivatives |  |  |  |  |  |
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward] |  |  |  |  |  |
Balance at Beginning of Period |  |  |  |  | 400,000 |
Total Gains (Losses) Included in Earnings |  |  |  |  | (400,000) |
Balance at End of Period |  |  |  |  | 0 |
Asset-backed securities |  |  |  |  |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward] |  |  |  |  |  |
Balance at Beginning of Period | 5,000,000 |  | 15,900,000 |  | 374,500,000 |
Total Gains (Losses) Included in Earnings | 0 |  |  |  |  |
Total Gains (Losses) Included in AOCI | (300,000) |  | (200,000) |  | 7,400,000 |
Purchases | 36,100,000 |  |  |  | 410,700,000 |
Sales |  |  |  |  |  |
Settlements | 0 |  | (200,000) |  | (38,800,000) |
Net transfer In (Out) of Level 3 (a) | (3,800,000) |  | (10,500,000) |  | (737,900,000) | [1]
Balance at End of Period | 37,000,000 |  | 5,000,000 |  | 15,900,000 |
Commercial mortgage-backed securities |  |  |  |  |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward] |  |  |  |  |  |
Balance at Beginning of Period | 5,700,000 |  | 5,000,000 |  |  |
Total Gains (Losses) Included in Earnings |  |  |  |  |  |
Total Gains (Losses) Included in AOCI |  |  | (300,000) |  |  |
Purchases | 83,700,000 |  | 1,000,000 |  | 5,000,000 |
Sales | (300,000) |  |  |  |  |
Settlements | 0 |  |  |  |  |
Net transfer In (Out) of Level 3 (a) | (6,000,000) |  |  |  |  |
Balance at End of Period | 83,100,000 |  | 5,700,000 |  | 5,000,000 |
Corporates |  |  |  |  |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward] |  |  |  |  |  |
Balance at Beginning of Period | 461,100,000 |  | 135,300,000 |  | 159,700,000 |
Total Gains (Losses) Included in Earnings | 0 |  | (300,000) |  | 0 |
Total Gains (Losses) Included in AOCI | 19,100,000 |  | (13,400,000) |  | (3,600,000) |
Purchases | 398,100,000 |  | 406,000,000 |  | 1,300,000 |
Sales | (11,800,000) |  | (9,600,000) |  | (26,800,000) |
Settlements | (2,400,000) |  | (23,100,000) |  | (14,200,000) |
Net transfer In (Out) of Level 3 (a) | (14,100,000) |  | (33,800,000) |  | 18,900,000 | [1]
Balance at End of Period | 850,000,000 |  | 461,100,000 |  | 135,300,000 |
Hybrids |  |  |  |  |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward] |  |  |  |  |  |
Balance at Beginning of Period |  |  | 8,800,000 |  | 5,200,000 |
Total Gains (Losses) Included in Earnings |  |  |  |  |  |
Total Gains (Losses) Included in AOCI |  |  | (100,000) |  | (100,000) |
Purchases |  |  |  |  |  |
Sales |  |  |  |  |  |
Settlements |  |  |  |  |  |
Net transfer In (Out) of Level 3 (a) |  |  | (8,700,000) |  | 3,700,000 | [1]
Balance at End of Period |  |  |  |  | 8,800,000 |
Municipal Debt Securities [Member] |  |  |  |  |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward] |  |  |  |  |  |
Balance at Beginning of Period |  |  |  |  | 0 |
Total Gains (Losses) Included in Earnings | 0 |  |  |  | 0 |
Total Gains (Losses) Included in AOCI | 2,200,000 |  |  |  | 100,000 |
Purchases | 35,000,000 |  |  |  | 10,200,000 |
Sales | 0 |  |  |  | 0 |
Settlements | 0 |  |  |  | 0 |
Net transfer In (Out) of Level 3 (a) |  |  |  |  | (10,300,000) | [1]
Balance at End of Period | 37,200,000 |  |  |  | 0 |
Non-agency residential mortgage-backed securities |  |  |  |  |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward] |  |  |  |  |  |
Balance at Beginning of Period |  |  |  |  | 3,800,000 |
Total Gains (Losses) Included in Earnings |  |  |  |  | (100,000) |
Total Gains (Losses) Included in AOCI |  |  |  |  | 0 |
Sales |  |  |  |  | (500,000) |
Settlements |  |  |  |  | (300,000) |
Net transfer In (Out) of Level 3 (a) |  |  |  |  | (2,900,000) | [1]
Balance at End of Period |  |  |  |  | 0 |
Equity Securities Classified As Held For Trading |  |  |  |  |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward] |  |  |  |  |  |
Balance at Beginning of Period | 10,700,000 |  |  |  |  |
Total Gains (Losses) Included in Earnings | 1,300,000 |  |  |  |  |
Total Gains (Losses) Included in AOCI |  |  |  |  |  |
Purchases | 1,500,000 |  | 10,700,000 |  |  |
Sales | 0 |  |  |  |  |
Settlements | (13,500,000) |  |  |  |  |
Net transfer In (Out) of Level 3 (a) | 0 |  |  |  |  |
Balance at End of Period | 0 |  | 10,700,000 |  |  |
Equity Securities |  |  |  |  |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward] |  |  |  |  |  |
Balance at Beginning of Period | 0 |  |  |  |  |
Total Gains (Losses) Included in Earnings | 0 |  | 200,000 |  |  |
Total Gains (Losses) Included in AOCI | 1,200,000 |  |  |  |  |
Purchases | 4,800,000 |  | 10,500,000 |  |  |
Sales | 0 |  | (10,700,000) |  |  |
Settlements | 0 |  |  |  |  |
Net transfer In (Out) of Level 3 (a) | 0 |  |  |  |  |
Balance at End of Period | 6,000,000 |  | 0 |  |  |
Other invested assets |  |  |  |  |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward] |  |  |  |  |  |
Balance at Beginning of Period | 0 |  |  |  |  |
Total Gains (Losses) Included in Earnings | (100,000) |  |  |  |  |
Total Gains (Losses) Included in AOCI | 0 |  |  |  |  |
Purchases | 11,300,000 |  |  |  |  |
Sales | 0 |  |  |  |  |
Settlements | 0 |  |  |  |  |
Net transfer In (Out) of Level 3 (a) | 0 |  |  |  |  |
Balance at End of Period | 11,200,000 |  |  |  |  |
Residential Mortgage Backed Securities |  |  |  |  |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward] |  |  |  |  |  |
Balance at Beginning of Period |  |  |  |  | 3,300,000 |
Total Gains (Losses) Included in AOCI |  |  |  |  | 0 |
Net transfer In (Out) of Level 3 (a) |  |  |  |  | (3,300,000) | [1]
Balance at End of Period |  |  |  |  | 0 |
Contingent purchase price reduction receivable |  |  |  |  |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward] |  |  |  |  |  |
Balance at Beginning of Period | 41,000,000 |  | 41,000,000 |  |  |
Total Gains (Losses) Included in Earnings | 500,000 |  |  |  | 41,000,000 |
Total Gains (Losses) Included in AOCI |  |  |  |  |  |
Purchases |  |  |  |  |  |
Sales |  |  |  |  |  |
Settlements |  |  |  |  |  |
Net transfer In (Out) of Level 3 (a) |  |  |  |  |  |
Balance at End of Period | $ 41,500,000 |  | $ 41,000,000 |  | $ 41,000,000 |
[1] | (a)The net transfers in and out of Level 3 during Fiscal 2012 was exclusively to or from Level 2.
[2] | The net transfers in and out of Level 3 during Fiscal 2014 were exclusively to or from Level 2.
[3] | (a)The net transfers in and out of Level 3 during Fiscal 2013 was exclusively to or from Level 2.

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- Definition Amount of sales of financial instrument classified as a liability measured using unobservable inputs that reflect the entity's own assumption about the assumptions market participants would use in pricing. + 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)(2) -URI http://asc.fasb.org/extlink&oid=36462937&loc=d3e19207-110258 + Details
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- Definition Amount of settlements of financial instrument classified as a liability measured using unobservable inputs that reflect the entity's own assumption about the assumptions market participants would use in pricing. + 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)(2) -URI http://asc.fasb.org/extlink&oid=36462937&loc=d3e19207-110258 + Details
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- Definition Amount of transfers of financial instrument classified as a liability into (out of) level 3 of the fair value hierarchy. + References No definition available. + Details
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- Definition Fair value of financial instrument classified as a liability measured using unobservable inputs that reflect the entity's own assumption about the assumptions market participants would use in pricing. + 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) -URI http://asc.fasb.org/extlink&oid=36462937&loc=d3e19207-110258 + Details
Name: | us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationsRecurringBasisLiabilityValue
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant