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Fair Value of Financial Instruments - Changes in Fair Value of Financial Instruments (Detail) (USD $) | 3 Months Ended | 6 Months Ended
--- | --- | ---
Mar. 31, 2013 | Apr. 01, 2012 | Mar. 31, 2013 | Apr. 01, 2012
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |  |  |  |  |  |  |
Fair Value, Assets, Level 1 to Level 2 Transfers, Amount |  |  | $ 0 |  |  |  | $ 0 |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward] |  |  |  |  |  |  |  |
Balance at Beginning of Period | 313,500,000 |  | 551,400,000 |  | 206,000,000 |  | 546,500,000 |
Total Gains (Losses) Included in Earnings | (100,000) |  | 41,100,000 |  | (300,000) |  | 41,000,000 |
Total Gains (Losses) Included in AOCI | 3,300,000 |  | 9,300,000 |  | 1,200,000 |  | 3,700,000 |
Purchases | 154,200,000 |  | 105,100,000 |  | 288,400,000 |  | 143,900,000 |
Sales |  |  | (9,700,000) |  | (9,600,000) |  | (16,700,000) |
Settlements | (13,000,000) |  | (21,700,000) |  | (13,700,000) |  | (32,600,000) |
Net transfer In (Out) of Level 3 (a) | (38,900,000) | [1] | 8,600,000 | [2] | (53,000,000) | [1] | (1,700,000) | [2]
Balance at End of Period | 419,000,000 |  | 684,100,000 |  | 419,000,000 |  | 684,100,000 |
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward] |  |  |  |  |  |  |  |
Balance at Beginning of Period | 1,680,100,000 |  | 1,502,900,000 |  | 1,782,800,000 |  | 1,472,100,000 |
Total Gains (Losses) Included in Earnings | 162,200,000 |  | 68,100,000 |  | 59,500,000 |  | 98,900,000 |
Total Gains (Losses) Included in AOCI |  |  |  |  |  |  |  |
Purchases |  |  |  |  |  |  |  |
Sales |  |  |  |  |  |  |  |
Settlements |  |  |  |  |  |  |  |
Net transfer In (Out) of Level 3 |  | [1] |  | [2] |  | [1] |  | [2]
Balance at End of Period | 1,842,300,000 |  | 1,571,000,000 |  | 1,842,300,000 |  | 1,571,000,000 |
FIA embedded derivatives, included in contractholder funds [Member] |  |  |  |  |  |  |  |
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward] |  |  |  |  |  |  |  |
Balance at Beginning of Period | 1,517,000,000 |  | 1,455,000,000 |  | 1,550,800,000 |  | 1,396,300,000 |
Total Gains (Losses) Included in Earnings | 122,600,000 |  | 41,700,000 |  | 88,800,000 |  | 100,400,000 |
Total Gains (Losses) Included in AOCI |  |  |  |  |  |  |  |
Purchases |  |  |  |  |  |  |  |
Sales |  |  |  |  |  |  |  |
Settlements |  |  |  |  |  |  |  |
Net transfer In (Out) of Level 3 |  | [1] |  | [2] |  | [1] |  | [2]
Balance at End of Period | 1,639,600,000 |  | 1,496,700,000 |  | 1,639,600,000 |  | 1,496,700,000 |
Equity conversion feature of preferred stock [Member] |  |  |  |  |  |  |  |
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward] |  |  |  |  |  |  |  |
Balance at Beginning of Period | 163,100,000 |  | 47,500,000 |  | 232,000,000 |  | 75,400,000 |
Total Gains (Losses) Included in Earnings | 39,600,000 |  | 26,400,000 |  | (29,300,000) |  | (1,500,000) |
Total Gains (Losses) Included in AOCI |  |  |  |  |  |  |  |
Purchases |  |  |  |  |  |  |  |
Sales |  |  |  |  |  |  |  |
Settlements |  |  |  |  |  |  |  |
Net transfer In (Out) of Level 3 |  | [1] |  | [2] |  | [1] |  | [2]
Balance at End of Period | 202,700,000 |  | 73,900,000 |  | 202,700,000 |  | 73,900,000 |
Available-for-sale embedded derivatives [Member] |  |  |  |  |  |  |  |
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward] |  |  |  |  |  |  |  |
Balance at Beginning of Period |  |  | 400,000 |  |  |  | 400,000 |
Total Gains (Losses) Included in Earnings |  |  |  |  |  |  |  |
Total Gains (Losses) Included in AOCI |  |  |  |  |  |  |  |
Purchases |  |  |  |  |  |  |  |
Sales |  |  |  |  |  |  |  |
Settlements |  |  |  |  |  |  |  |
Net transfer In (Out) of Level 3 |  |  |  | [2] |  |  |  | [2]
Balance at End of Period |  |  | 400,000 |  |  |  | 400,000 |
US Treasury and Government [Member] |  |  |  |  |  |  |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |  |  |  |  |  |  |
Fair Value, Assets, Level 1 to Level 2 Transfers, Amount | 79,300,000 |  |  |  | 79,300,000 |  |  |
Asset-backed and Hybrid Securities [Member] |  |  |  |  |  |  |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |  |  |  |  |  |  |
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Transfers out of Level 3 | 38,900,000 |  |  |  | 53,000,000 |  |  |
Asset-backed securities [Member] |  |  |  |  |  |  |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward] |  |  |  |  |  |  |  |
Balance at Beginning of Period | 5,300,000 |  | 400,700,000 |  | 15,900,000 |  | 374,500,000 |
Total Gains (Losses) Included in Earnings |  |  |  |  |  |  |  |
Total Gains (Losses) Included in AOCI |  |  | 10,700,000 |  | (100,000) |  | 6,100,000 |
Purchases |  |  | 93,600,000 |  |  |  | 132,400,000 |
Sales |  |  |  |  |  |  |  |
Settlements |  |  | (12,800,000) |  |  |  | (20,800,000) |
Net transfer In (Out) of Level 3 (a) |  | [1] | 10,800,000 | [2] | (10,500,000) | [1] | 10,800,000 | [2]
Balance at End of Period | 5,300,000 |  | 503,000,000 |  | 5,300,000 |  | 503,000,000 |
Commercial mortgage-backed securities [Member] |  |  |  |  |  |  |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward] |  |  |  |  |  |  |  |
Balance at Beginning of Period | 6,100,000 |  |  |  | 5,000,000 |  |  |
Total Gains (Losses) Included in Earnings |  |  |  |  |  |  |  |
Total Gains (Losses) Included in AOCI | 100,000 |  |  |  | 200,000 |  |  |
Purchases |  |  |  |  | 1,000,000 |  |  |
Sales |  |  |  |  |  |  |  |
Settlements |  |  |  |  |  |  |  |
Net transfer In (Out) of Level 3 (a) |  | [1] |  |  |  | [1] |  |
Balance at End of Period | 6,200,000 |  |  |  | 6,200,000 |  |  |
Corporates [Member] |  |  |  |  |  |  |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward] |  |  |  |  |  |  |  |
Balance at Beginning of Period | 256,100,000 |  | 138,500,000 |  | 135,300,000 |  | 159,700,000 |
Total Gains (Losses) Included in Earnings | (100,000) |  | 100,000 |  | (300,000) |  |  |
Total Gains (Losses) Included in AOCI | 3,200,000 |  | (1,400,000) |  | 1,200,000 |  | (2,300,000) |
Purchases | 144,200,000 |  | 1,300,000 |  | 277,400,000 |  | 1,300,000 |
Sales |  |  | (9,700,000) |  | (9,600,000) |  | (16,700,000) |
Settlements | (13,000,000) |  | (8,800,000) |  | (13,700,000) |  | (11,600,000) |
Net transfer In (Out) of Level 3 (a) | (33,900,000) | [1] | 100,000 | [2] | (33,800,000) | [1] | (10,300,000) | [2]
Balance at End of Period | 356,500,000 |  | 120,100,000 |  | 356,500,000 |  | 120,100,000 |
Hybrids [Member] |  |  |  |  |  |  |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward] |  |  |  |  |  |  |  |
Balance at Beginning of Period | 5,000,000 |  | 5,100,000 |  | 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) | (5,000,000) | [1] |  | [2] | (8,700,000) | [1] |  | [2]
Balance at End of Period |  |  | 5,100,000 |  |  |  | 5,100,000 |
Municipals [Member] |  |  |  |  |  |  |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward] |  |  |  |  |  |  |  |
Balance at Beginning of Period |  |  | 100,000 |  |  |  |  |
Total Gains (Losses) Included in Earnings |  |  |  |  |  |  |  |
Total Gains (Losses) Included in AOCI |  |  | 100,000 |  |  |  | 100,000 |
Purchases |  |  | 10,200,000 |  |  |  | 10,200,000 |
Sales |  |  |  |  |  |  |  |
Settlements |  |  |  |  |  |  |  |
Net transfer In (Out) of Level 3 (a) |  |  |  | [2] |  |  | 100,000 | [2]
Balance at End of Period |  |  | 10,400,000 |  |  |  | 10,400,000 |
Agency residential mortgage-backed securities [Member] |  |  |  |  |  |  |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward] |  |  |  |  |  |  |  |
Balance at Beginning of Period |  |  | 3,300,000 |  |  |  | 3,300,000 |
Total Gains (Losses) Included in Earnings |  |  |  |  |  |  |  |
Total Gains (Losses) Included in AOCI |  |  |  |  |  |  |  |
Purchases |  |  |  |  |  |  |  |
Sales |  |  |  |  |  |  |  |
Settlements |  |  |  |  |  |  |  |
Net transfer In (Out) of Level 3 (a) |  |  |  | [2] |  |  |  | [2]
Balance at End of Period |  |  | 3,300,000 |  |  |  | 3,300,000 |
Non-agency residential mortgage-backed securities [Member] |  |  |  |  |  |  |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward] |  |  |  |  |  |  |  |
Balance at Beginning of Period |  |  | 3,700,000 |  |  |  | 3,800,000 |
Total Gains (Losses) Included in Earnings |  |  |  |  |  |  |  |
Total Gains (Losses) Included in AOCI |  |  | (100,000) |  |  |  | (100,000) |
Purchases |  |  |  |  |  |  |  |
Sales |  |  |  |  |  |  |  |
Settlements |  |  | (100,000) |  |  |  | (200,000) |
Net transfer In (Out) of Level 3 (a) |  |  | (2,300,000) | [2] |  |  | (2,300,000) | [2]
Balance at End of Period |  |  | 1,200,000 |  |  |  | 1,200,000 |
Equity securities available-for-sale [Member] |  |  |  |  |  |  |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward] |  |  |  |  |  |  |  |
Balance at Beginning of Period | 0 |  |  |  | 0 |  |  |
Total Gains (Losses) Included in Earnings | 0 |  |  |  | 0 |  |  |
Total Gains (Losses) Included in AOCI | 0 |  |  |  | 0 |  |  |
Purchases | 10,000,000 |  |  |  | 10,000,000 |  |  |
Sales | 0 |  |  |  | 0 |  |  |
Settlements | 0 |  |  |  | 0 |  |  |
Net transfer In (Out) of Level 3 (a) | 0 |  |  |  | 0 |  |  |
Balance at End of Period | 10,000,000 |  |  |  | 10,000,000 |  |  |
Corporate and Non-Agency Residential Mortgage-Backed Securities [Member] |  |  |  |  |  |  |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |  |  |  |  |  |  |
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Transfers out of Level 3 |  |  | 2,300,000 |  |  |  | 12,600,000 |
Contingent purchase price reduction receivable [Member] |  |  |  |  |  |  |  |
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 |  |  | 41,000,000 |  |  |  | 41,000,000 |
Total Gains (Losses) Included in AOCI |  |  |  |  |  |  |  |
Purchases |  |  |  |  |  |  |  |
Sales |  |  |  |  |  |  |  |
Settlements |  |  |  |  |  |  |  |
Net transfer In (Out) of Level 3 (a) |  | [1] |  | [2] |  | [1] |  | [2]
Balance at End of Period | $ 41,000,000 |  | $ 41,000,000 |  | $ 41,000,000 |  | $ 41,000,000 |
[1] | The net transfers in and out of Level 3 during the three and six months ended March 31, 2013 were exclusively to or from Level 2.
[2] | The net transfers in and out of Level 3 during the three and six months ended April 1, 2012 was exclusively to or from Level 2.

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- Definition Amount of transfers of assets measured on a recurring basis out of Level 1 of the fair value hierarchy into Level 2. + 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 (bb) -URI http://asc.fasb.org/extlink&oid=7578670&loc=d3e19207-110258 + Details
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- Definition Amount of gain (loss) recognized in earnings, arising from 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 Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(1) -URI http://asc.fasb.org/extlink&oid=7578670&loc=d3e19207-110258 + Details
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- Definition Amount of gain (loss) recognized in other comprehensive income, arising from 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 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 + Details
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- Definition Purchases that have taken place during the period in relation to assets measured at fair value and categorized within Level 3 of the fair value hierarchy. + 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=7578670&loc=d3e19207-110258 + Details
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- Definition Sales that have taken place during the period in relation to assets measured at fair value and categorized within Level 3 of the fair value hierarchy. + 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=7578670&loc=d3e19207-110258 + Details
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- Definition Settlements that have taken place during the period in relation to assets measured at fair value and categorized within Level 3 of the fair value hierarchy. + 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=7578670&loc=d3e19207-110258 + Details
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- Definition This element represents [net] transfers in to and out of assets measured at fair value on a recurring basis using unobservable inputs (Level 3) which have taken place during the period. + 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(3) -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 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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- Definition This element represents an asset measured at fair value using significant unobservable inputs (Level 3) which is required for reconciliation purposes of beginning and ending balances. + 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=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 -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 earnings, 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)(1) -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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- 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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- Definition Purchases that have taken place during the period in relation to liabilities measured at fair value and categorized within Level 3 of the fair value hierarchy. + 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=7578670&loc=d3e19207-110258 + Details
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- Definition Sales that have taken place during the period in relation to liabilities measured at fair value and categorized within Level 3 of the fair value hierarchy. + 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=7578670&loc=d3e19207-110258 + Details
Name: | us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisLiabilitySales
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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- Definition Settlements that have taken place during the period in relation to liabilities measured at fair value and categorized within Level 3 of the fair value hierarchy. + 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=7578670&loc=d3e19207-110258 + Details
Name: | us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisLiabilitySettlements
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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- Definition This element represents [net] transfers in to and out of liabilities measured at fair value on a recurring basis using unobservable inputs (Level 3) which have taken place during the period. + References No definition available. + Details
Name: | us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisLiabilityTransfersNet
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

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- Definition This element represents a liability measured at fair value using significant unobservable inputs (Level 3) which is required for reconciliation purposes of beginning and ending balances. + 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=7578670&loc=d3e19207-110258 + Details
Name: | us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationsRecurringBasisLiabilityValue
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant