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Derivative Financial Instruments - Summary of Gain (Loss) Recognized in Income on Derivatives (Detail) (USD $)
In Millions, unless otherwise specified
3 Months Ended
Dec. 30, 2012
Jan. 01, 2012
Derivative Instruments, Gain (Loss) [Line Items]    
Gain (Loss) Recognized in Income on Derivatives $ 73.0 $ 11.3
Equity conversion feature of preferred stock [Member] | Gain from the change in the fair value of the equity conversion feature of preferred stock [Member]
   
Derivative Instruments, Gain (Loss) [Line Items]    
Gain (Loss) Recognized in Income on Derivatives 68.9 27.9
Foreign exchange contracts [Member] | Other (expense) income, net [Member]
   
Derivative Instruments, Gain (Loss) [Line Items]    
Gain (Loss) Recognized in Income on Derivatives (4.1) 7.3
Call options [Member] | Net investment gains [Member]
   
Derivative Instruments, Gain (Loss) [Line Items]    
Gain (Loss) Recognized in Income on Derivatives (20.9) 19.9
Futures contracts [Member] | Net investment gains [Member]
   
Derivative Instruments, Gain (Loss) [Line Items]    
Gain (Loss) Recognized in Income on Derivatives (4.7) 14.9
FIA embedded derivatives [Member] | Benefits and other changes in policy reserves [Member]
   
Derivative Instruments, Gain (Loss) [Line Items]    
Gain (Loss) Recognized in Income on Derivatives $ 33.8 $ (58.7)