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Derivative Financial Instruments Balances in the Statement of Financial Position (Details) (USD $)
In Thousands, unless otherwise specified
Mar. 31, 2013
Sep. 30, 2012
Derivatives, Fair Value [Line Items]    
Derivative Credit Risk Valuation Adjustment, Derivative Assets $ 13 $ 46
Derivative Asset, Fair Value, Gross Asset 3,364 3,237
Derivative Liability, Fair Value, Gross Liability 5,533 9,965
Accumulated other comprehensive loss (50,208) (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 3,257 3,196
Derivative Liability, Fair Value, Gross Liability 1,491 3,072
Cash Flow Hedging [Member] | Commodity Contract [Member]
   
Derivatives, Fair Value [Line Items]    
Derivative, Nonmonetary Notional Amount 10,000  
Price Risk Cash Flow Hedge Unrealized Gain (Loss) to be Reclassified During Next 12 Months (502)  
Accumulated other comprehensive loss (503)  
Accumulated Other Comprehensive Income, Tax Effect (79)  
Derivative, Notional Amount 19,887  
Cash Flow Hedging [Member] | Commodity Contract [Member] | Other Current Assets [Member]
   
Derivatives, Fair Value [Line Items]    
Derivative Asset, Fair Value, Gross Asset 61 985
Cash Flow Hedging [Member] | Commodity Contract [Member] | Accounts Payable [Member]
   
Derivatives, Fair Value [Line Items]    
Derivative Liability, Fair Value, Gross Liability 680 9
Cash Flow Hedging [Member] | Commodity Contract [Member] | Other Liabilities [Member]
   
Derivatives, Fair Value [Line Items]    
Derivative Liability, Fair Value, Gross Liability 67 0
Cash Flow Hedging [Member] | Commodity Contract [Member] | Other Assets [Member]
   
Derivatives, Fair Value [Line Items]    
Derivative Asset, Fair Value, Gross Asset 68 1,017
Cash Flow Hedging [Member] | Foreign Exchange Contract [Member]
   
Derivatives, Fair Value [Line Items]    
Accumulated other comprehensive loss 1,797  
Accumulated Other Comprehensive Income, Tax Effect 587  
Foreign Currency Cash Flow Hedge Gain (Loss) to be Reclassified During Next 12 Months 1,829  
Derivative, Notional Amount 147,027  
Cash Flow Hedging [Member] | Foreign Exchange Contract [Member] | Other Current Assets [Member]
   
Derivatives, Fair Value [Line Items]    
Derivative Asset, Fair Value, Gross Asset 2,981 1,194
Cash Flow Hedging [Member] | Foreign Exchange Contract [Member] | Accounts Payable [Member]
   
Derivatives, Fair Value [Line Items]    
Derivative Liability, Fair Value, Gross Liability 681 3,063
Cash Flow Hedging [Member] | Foreign Exchange Contract [Member] | Other Liabilities [Member]
   
Derivatives, Fair Value [Line Items]    
Derivative Liability, Fair Value, Gross Liability 63 0
Cash Flow Hedging [Member] | Foreign Exchange Contract [Member] | Other Assets [Member]
   
Derivatives, Fair Value [Line Items]    
Derivative Asset, Fair Value, Gross Asset 147 0
Fair Value Hedging [Member]
   
Derivatives, Fair Value [Line Items]    
Derivative, Notional Amount 132,206 172,581
Fair Value Hedging [Member] | Foreign Exchange Contract [Member] | Accounts Payable [Member]
   
Derivatives, Fair Value [Line Items]    
Derivative Liability, Fair Value, Gross Liability 3,234 3,967
Fair Value Hedging [Member] | Foreign Exchange Contract [Member] | Other Liabilities [Member]
   
Derivatives, Fair Value [Line Items]    
Derivative Liability, Fair Value, Gross Liability 808 2,926
Fair Value Hedging [Member] | Foreign Exchange [Member] | Other Current Assets [Member]
   
Derivatives, Fair Value [Line Items]    
Derivative Asset, Fair Value, Gross Asset $ 107 $ 41