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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
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)