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Derivative Financial Instruments Balances in the Statement of Financial Position (Details) (USD $)
In Thousands, unless otherwise specified
Jun. 30, 2013
Sep. 30, 2012
Derivatives, Fair Value [Line Items]    
Derivative Credit Risk Valuation Adjustment, Derivative Assets $ 36 $ 46
Derivative Asset, Fair Value, Gross Asset 5,879 3,237
Derivative Liability, Fair Value, Gross Liability 5,991 9,965
Accumulated other comprehensive loss (56,310) (33,435)
Other Current Assets [Member]
   
Derivatives, Fair Value [Line Items]    
Collateral Already Posted, Aggregate Fair Value 450 50
Cash Flow Hedging [Member]
   
Derivatives, Fair Value [Line Items]    
Derivative Asset, Fair Value, Gross Asset 5,855 3,196
Derivative Liability, Fair Value, Gross Liability 1,392 3,072
Cash Flow Hedging [Member] | Commodity Contract [Member]
   
Derivatives, Fair Value [Line Items]    
Price Risk Cash Flow Hedge Unrealized Gain (Loss) to be Reclassified During Next 12 Months (1,010)  
Accumulated other comprehensive loss (1,068)  
Accumulated Other Comprehensive Income, Tax Effect (127)  
Cash Flow Hedging [Member] | Commodity Contract [Member] | Other Current Assets [Member]
   
Derivatives, Fair Value [Line Items]    
Derivative Asset, Fair Value, Gross Asset 21 985
Cash Flow Hedging [Member] | Commodity Contract [Member] | Accounts Payable [Member]
   
Derivatives, Fair Value [Line Items]    
Derivative Liability, Fair Value, Gross Liability 1,174 9
Cash Flow Hedging [Member] | Commodity Contract [Member] | Other Liabilities [Member]
   
Derivatives, Fair Value [Line Items]    
Derivative Liability, Fair Value, Gross Liability 79 0
Cash Flow Hedging [Member] | Commodity Contract [Member] | Other Assets [Member]
   
Derivatives, Fair Value [Line Items]    
Derivative Asset, Fair Value, Gross Asset 16 1,017
Cash Flow Hedging [Member] | Foreign Exchange Contract [Member]
   
Derivatives, Fair Value [Line Items]    
Accumulated other comprehensive loss 4,138  
Accumulated Other Comprehensive Income, Tax Effect 1,541  
Foreign Currency Cash Flow Hedge Gain (Loss) to be Reclassified During Next 12 Months 3,697  
Derivative, Notional Amount 228,419  
Cash Flow Hedging [Member] | Foreign Exchange Contract [Member] | Other Current Assets [Member]
   
Derivatives, Fair Value [Line Items]    
Derivative Asset, Fair Value, Gross Asset 5,197 1,194
Cash Flow Hedging [Member] | Foreign Exchange Contract [Member] | Accounts Payable [Member]
   
Derivatives, Fair Value [Line Items]    
Derivative Liability, Fair Value, Gross Liability 126 3,063
Cash Flow Hedging [Member] | Foreign Exchange Contract [Member] | Other Liabilities [Member]
   
Derivatives, Fair Value [Line Items]    
Derivative Liability, Fair Value, Gross Liability 13 0
Cash Flow Hedging [Member] | Foreign Exchange Contract [Member] | Other Assets [Member]
   
Derivatives, Fair Value [Line Items]    
Derivative Asset, Fair Value, Gross Asset 621 0
Fair Value Hedging [Member]
   
Derivatives, Fair Value [Line Items]    
Derivative, Notional Amount 112,737 172,581
Fair Value Hedging [Member] | Foreign Exchange Contract [Member] | Accounts Payable [Member]
   
Derivatives, Fair Value [Line Items]    
Derivative Liability, Fair Value, Gross Liability 3,324 3,967
Fair Value Hedging [Member] | Foreign Exchange Contract [Member] | Other Liabilities [Member]
   
Derivatives, Fair Value [Line Items]    
Derivative Liability, Fair Value, Gross Liability 1,078 2,926
Fair Value Hedging [Member] | Foreign Exchange [Member] | Other Current Assets [Member]
   
Derivatives, Fair Value [Line Items]    
Derivative Asset, Fair Value, Gross Asset 24 41
Zinc [Member] | Cash Flow Hedging [Member] | Commodity Contract [Member]
   
Derivatives, Fair Value [Line Items]    
Derivative, Nonmonetary Notional Amount 10,000  
Derivative, Notional Amount $ 20,372