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Derivative Financial Instruments - Fair Value of Outstanding Derivative Contracts in Condensed Consolidated Balance Sheets (Detail) (USD $)
Dec. 30, 2012
Sep. 30, 2012
Derivatives, Fair Value [Line Items]    
Total asset derivatives $ 156,400,000 $ 200,700,000
Derivatives designated as hedging instruments [Member]
    
Derivatives, Fair Value [Line Items]    
Total asset derivatives 2,400,000 3,200,000
Total liability derivatives 2.1 3.1
Derivatives designated as hedging instruments [Member] | Commodity swap and option agreements [Member] | Receivables, net [Member]
    
Derivatives, Fair Value [Line Items]    
Total asset derivatives 1,100,000 1,000,000
Derivatives designated as hedging instruments [Member] | Commodity swap and option agreements [Member] | Other assets [Member]
    
Derivatives, Fair Value [Line Items]    
Total asset derivatives 700,000 1,000,000
Derivatives designated as hedging instruments [Member] | Foreign exchange forward agreements [Member] | Receivables, net [Member]
    
Derivatives, Fair Value [Line Items]    
Total asset derivatives 600,000 1,200,000
Derivatives designated as hedging instruments [Member] | Foreign exchange forward agreements [Member] | Accounts payable and other current liabilities [Member]
    
Derivatives, Fair Value [Line Items]    
Total liability derivatives 2.1 3.1
Derivatives not designated as hedging instruments [Member]
    
Derivatives, Fair Value [Line Items]    
Total asset derivatives 158,800,000 203,900,000
Total liability derivatives 1,690.7 1,793.7
Derivatives not designated as hedging instruments [Member] | Equity conversion feature of preferred stock [Member]
    
Derivatives, Fair Value [Line Items]    
Total liability derivatives 163.1 232.0
Derivatives not designated as hedging instruments [Member] | Foreign exchange forward agreements [Member] | Accounts payable and other current liabilities [Member]
    
Derivatives, Fair Value [Line Items]    
Total liability derivatives 5.7 4.0
Derivatives not designated as hedging instruments [Member] | Foreign exchange forward agreements [Member] | Other liabilities [Member]
    
Derivatives, Fair Value [Line Items]    
Total liability derivatives 2.8 2.9
Derivatives not designated as hedging instruments [Member] | Call options [Member] | Derivative investments [Member]
    
Derivatives, Fair Value [Line Items]    
Total asset derivatives 152,500,000 200,700,000
Derivatives not designated as hedging instruments [Member] | FIA embedded derivatives [Member] | Contractholder funds [Member]
    
Derivatives, Fair Value [Line Items]    
Total liability derivatives 1,517.0 1,550.8
Derivatives not designated as hedging instruments [Member] | Futures contracts [Member] | Derivative investments [Member]
    
Derivatives, Fair Value [Line Items]    
Total asset derivatives 3,900,000  
Derivatives not designated as hedging instruments [Member] | Futures contracts [Member] | Other liabilities [Member]
    
Derivatives, Fair Value [Line Items]    
Total liability derivatives   $ 0.9