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Investments - Fair Value and Gross Unrealized Losses of Available-for-Sale Securities (Detail) (USD $) In Millions, unless otherwise specified | Dec. 30, 2012 Securities | Sep. 30, 2012 Securities
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Total number of available-for-sale securities in an unrealized loss position, Less than 12 months | 158 | 100
Total number of available-for-sale securities in an unrealized loss position, 12 months or longer | 62 | 56
Total number of available-for-sale securities in an unrealized loss position | 220 | 156
Available-for-sale securities, Fair Value, Less than 12 months | $ 278.1 | $ 681.1
Available-for-sale Securities, Gross Unrealized Losses, Less than 12 Months | (9.1) | (11.9)
Available-for-sale securities, Fair Value, 12 months or longer | 1,096.3 | 323.8
Available-for-sale Securities, Gross Unrealized Losses, 12 months or longer | (12.3) | (18.7)
Available-for-sale securities, Fair Value, Total | 1,374.4 | 1,004.9
Available-for-sale Securities, Gross Unrealized Losses, Total | (21.4) | (30.6)
Asset-backed securities [Member] |  |
Available-for-sale securities, Fair Value, Less than 12 months | 7.6 | 169.8
Available-for-sale Securities, Gross Unrealized Losses, Less than 12 Months | (0.1) | (1.0)
Available-for-sale securities, Fair Value, 12 months or longer | 186.9 | 7.5
Available-for-sale Securities, Gross Unrealized Losses, 12 months or longer | (0.6) | (0.6)
Available-for-sale securities, Fair Value, Total | 194.5 | 177.3
Available-for-sale Securities, Gross Unrealized Losses, Total | (0.7) | (1.6)
Commercial mortgage-backed securities [Member] |  |
Available-for-sale securities, Fair Value, Less than 12 months | 7.1 | 0.8
Available-for-sale Securities, Gross Unrealized Losses, Less than 12 Months | (1.7) | (0.8)
Available-for-sale securities, Fair Value, 12 months or longer | 14.4 | 10.7
Available-for-sale Securities, Gross Unrealized Losses, 12 months or longer | (0.1) | (1.6)
Available-for-sale securities, Fair Value, Total | 21.5 | 11.5
Available-for-sale Securities, Gross Unrealized Losses, Total | (1.8) | (2.4)
Corporates [Member] |  |
Available-for-sale securities, Fair Value, Less than 12 months | 98.4 | 411.3
Available-for-sale Securities, Gross Unrealized Losses, Less than 12 Months | (2.3) | (8.1)
Available-for-sale securities, Fair Value, 12 months or longer | 709.5 | 45.5
Available-for-sale Securities, Gross Unrealized Losses, 12 months or longer | (8.9) | (1.9)
Available-for-sale securities, Fair Value, Total | 807.9 | 456.8
Available-for-sale Securities, Gross Unrealized Losses, Total | (11.2) | (10.0)
Hybrids [Member] |  |
Available-for-sale securities, Fair Value, Less than 12 months | 40.1 | 13.4
Available-for-sale Securities, Gross Unrealized Losses, Less than 12 Months | (1.6) | (0.4)
Available-for-sale securities, Fair Value, 12 months or longer | 6.4 | 107.7
Available-for-sale Securities, Gross Unrealized Losses, 12 months or longer | (0.1) | (9.2)
Available-for-sale securities, Fair Value, Total | 46.5 | 121.1
Available-for-sale Securities, Gross Unrealized Losses, Total | (1.7) | (9.6)
Municipals [Member] |  |
Available-for-sale securities, Fair Value, Less than 12 months |  | 71.1
Available-for-sale Securities, Gross Unrealized Losses, Less than 12 Months |  | (1.1)
Available-for-sale securities, Fair Value, 12 months or longer | 103.7 |
Available-for-sale Securities, Gross Unrealized Losses, 12 months or longer | (1.2) |
Available-for-sale securities, Fair Value, Total | 103.7 | 71.1
Available-for-sale Securities, Gross Unrealized Losses, Total | (1.2) | (1.1)
Agency residential mortgage-backed securities [Member] |  |
Available-for-sale securities, Fair Value, Less than 12 months | 6.5 | 1.8
Available-for-sale Securities, Gross Unrealized Losses, Less than 12 Months | (0.2) | (0.2)
Available-for-sale securities, Fair Value, 12 months or longer | 3.3 | 6.1
Available-for-sale Securities, Gross Unrealized Losses, 12 months or longer | (0.1) | (0.1)
Available-for-sale securities, Fair Value, Total | 9.8 | 7.9
Available-for-sale Securities, Gross Unrealized Losses, Total | (0.3) | (0.3)
Non-agency residential mortgage-backed securities [Member] |  |
Available-for-sale securities, Fair Value, Less than 12 months | 77.9 | 12.9
Available-for-sale Securities, Gross Unrealized Losses, Less than 12 Months | (2.1) | (0.3)
Available-for-sale securities, Fair Value, 12 months or longer | 65.4 | 101.8
Available-for-sale Securities, Gross Unrealized Losses, 12 months or longer | (0.7) | (4.0)
Available-for-sale securities, Fair Value, Total | 143.3 | 114.7
Available-for-sale Securities, Gross Unrealized Losses, Total | (2.8) | (4.3)
Equities [Member] |  |
Available-for-sale securities, Fair Value, Less than 12 months | 40.5 |
Available-for-sale Securities, Gross Unrealized Losses, Less than 12 Months | (1.1) |
Available-for-sale securities, Fair Value, 12 months or longer | 6.7 | 44.5
Available-for-sale Securities, Gross Unrealized Losses, 12 months or longer | (0.6) | (1.3)
Available-for-sale securities, Fair Value, Total | 47.2 | 44.5
Available-for-sale Securities, Gross Unrealized Losses, Total | $ (1.7) | $ (1.3)

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