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Derivative Financial Instruments - Fair Value of Outstanding Derivative Contracts in Consolidated Balance Sheets (Detail) (USD $)
In Thousands, unless otherwise specified
Sep. 30, 2012
Sep. 30, 2011
Derivatives, Fair Value [Line Items]    
Total asset derivatives $ 200,667 $ 52,335
Total liability derivatives 1,551,733 1,400,568
Derivatives designated as hedging instruments [Member]
    
Derivatives, Fair Value [Line Items]    
Total asset derivatives 3,196 3,463
Total liability derivatives 3,072 5,884
Derivatives designated as hedging instruments [Member] | Commodity contracts [Member] | Receivables [Member]
    
Derivatives, Fair Value [Line Items]    
Total asset derivatives 985 274
Derivatives designated as hedging instruments [Member] | Commodity contracts [Member] | Deferred charges and other assets [Member]
    
Derivatives, Fair Value [Line Items]    
Total asset derivatives 1,017  
Derivatives designated as hedging instruments [Member] | Commodity contracts [Member] | Accounts payable [Member]
    
Derivatives, Fair Value [Line Items]    
Total liability derivatives 9 1,228
Derivatives designated as hedging instruments [Member] | Commodity contracts [Member] | Other liabilities [Member]
    
Derivatives, Fair Value [Line Items]    
Total liability derivatives   4
Derivatives designated as hedging instruments [Member] | Foreign exchange contracts [Member] | Receivables [Member]
    
Derivatives, Fair Value [Line Items]    
Total asset derivatives 1,194 3,189
Derivatives designated as hedging instruments [Member] | Foreign exchange contracts [Member] | Accounts payable [Member]
    
Derivatives, Fair Value [Line Items]    
Total liability derivatives 3,063 2,698
Derivatives designated as hedging instruments [Member] | Interest rate contracts [Member] | Accounts payable [Member]
    
Derivatives, Fair Value [Line Items]    
Total liability derivatives   1,246
Derivatives designated as hedging instruments [Member] | Interest rate contracts [Member] | Accrued and other current liabilities [Member]
    
Derivatives, Fair Value [Line Items]    
Total liability derivatives   708
Derivatives not designated as hedging instruments [Member]
    
Derivatives, Fair Value [Line Items]    
Total asset derivatives 3,237 3,463
Total liability derivatives 241,915 104,215
Derivatives not designated as hedging instruments [Member] | Equity conversion feature of preferred stock [Member]
    
Derivatives, Fair Value [Line Items]    
Total liability derivatives 231,950 75,350
Derivatives not designated as hedging instruments [Member] | Foreign exchange contracts [Member] | Receivables [Member]
    
Derivatives, Fair Value [Line Items]    
Total asset derivatives 41  
Derivatives not designated as hedging instruments [Member] | Foreign exchange contracts [Member] | Accounts payable [Member]
    
Derivatives, Fair Value [Line Items]    
Total liability derivatives 3,967 10,945
Derivatives not designated as hedging instruments [Member] | Foreign exchange contracts [Member] | Other liabilities [Member]
    
Derivatives, Fair Value [Line Items]    
Total liability derivatives $ 2,926 $ 12,036