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Fair Value of Financial Instruments - Changes in Fair Value of Financial Instruments (Detail) (USD $) In Millions, unless otherwise specified | 3 Months Ended |  |  | 3 Months Ended
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Dec. 30, 2012 | Jan. 01, 2012 | Dec. 30, 2012 Asset-backed securities [Member] | Jan. 01, 2012 Asset-backed securities [Member] | Dec. 30, 2012 Commercial mortgage-backed securities [Member] | Dec. 30, 2012 Corporates [Member] | Jan. 01, 2012 Corporates [Member] | Dec. 30, 2012 Hybrids [Member] | Jan. 01, 2012 Hybrids [Member] | Dec. 30, 2012 Municipals [Member] | Jan. 01, 2012 Municipals [Member] | Jan. 01, 2012 Non-agency residential mortgage-backed securities [Member] | Dec. 30, 2012 Contingent purchase price reduction receivable [Member] | Sep. 30, 2012 Contingent purchase price reduction receivable [Member] | Jan. 01, 2012 Agency residential mortgage-backed securities [Member] | Dec. 30, 2012 FIA embedded derivatives, included in contractholder funds [Member] | Jan. 01, 2012 FIA embedded derivatives, included in contractholder funds [Member] | Dec. 30, 2012 Equity conversion feature of preferred stock [Member] | Jan. 01, 2012 Equity conversion feature of preferred stock [Member] | Jan. 01, 2012 Available-for-sale embedded derivatives [Member]
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Balance at Beginning of Period | $ 206.0 | $ 546.5 | $ 15.9 | $ 374.5 | $ 5.0 | $ 135.3 | $ 159.7 | $ 8.8 | $ 5.2 |  |  | $ 3.8 | $ 41.0 | $ 41.0 | $ 3.3 |  |  |  |  |
Total Gains (Losses) Included in Earnings | (0.2) | (0.1) |  |  |  | (0.2) | (0.1) |  |  |  |  |  |  |  |  |  |  |  |  |
Total Gains (Losses) Included in AOCI | (2.1) | (5.6) | (0.1) | (4.6) | 0.1 | (2.0) | (0.9) | (0.1) | (0.1) |  |  |  |  |  |  |  |  |  |  |
Purchases | 134.2 | 38.8 |  | 38.8 | 1.0 | 133.2 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Sales | (9.6) | (7.0) |  |  |  | (9.6) | (7.0) |  |  |  |  |  |  |  |  |  |  |  |  |
Settlements | (0.7) | (10.9) |  | (8.0) |  | (0.7) | (2.8) |  |  |  |  | (0.1) |  |  |  |  |  |  |  |
Net transfer In (Out) of Level 3 | (14.1) | (10.3) | (10.5) |  |  | 0.1 | (10.4) | (3.7) |  |  | 0.1 |  |  |  |  |  |  |  |  |
Balance at End of Period | 313.5 | 551.4 | 5.3 | 400.7 | 6.1 | 256.1 | 138.5 | 5.0 | 5.1 |  | 0.1 | 3.7 | 41.0 | 41.0 | 3.3 |  |  |  |  |
Balance at Beginning of Period | 1,782.8 | 1,472.1 |  |  |  |  |  |  |  |  |  |  |  |  |  | 1,550.8 | 1,396.3 | 232.0 | 75.4 | 0.4
Total Gains (Losses) Included in Earnings | (102.7) | 30.8 |  |  |  |  |  |  |  |  |  |  |  |  |  | (33.8) | 58.7 | (68.9) | (27.9) |
Total Gains (Losses) Included in AOCI |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Purchases |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Sales |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Settlements |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Net Transfer in (Out) of Level 3 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Balance at End of Period | $ 1,680.1 | $ 1,502.9 |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 1,517.0 | $ 1,455.0 | $ 163.1 | $ 47.5 | $ 0.4

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