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Derivatives/Hedges, Gain (Loss) by Hedging Relationship, by Income Statement Location, (Details) (USD $)
In Thousands, unless otherwise specified
 3 Months Ended
Jun. 30, 2012
Jun. 30, 2011
Derivative Instruments, Gain (Loss) [Line Items]    
Loss Recognized in Other Comprehensive Income (Loss) $ 2,366 $ 1,777
Derivative Instruments Gain Loss Reclassification From Accumulated O C I To Income 780 (269)
Amount of Loss (Gain) Recognized in Income 1,523  
Foreign Exchange Contract [Member]
    
Derivative Instruments, Gain (Loss) [Line Items]    
Loss Recognized in Other Comprehensive Income (Loss) 0  
Income Statement Location of Gain (Loss) Reclassified from Accumulated OCI Other income - net  
Derivative Instruments Gain Loss Reclassification From Accumulated O C I To Income 0  
Amount of Loss (Gain) Recognized in Income (436)  
Commodity Derivatives [Member]
    
Derivative Instruments, Gain (Loss) [Line Items]    
Loss Recognized in Other Comprehensive Income (Loss) 2,366 1,777
Income Statement Location of Gain (Loss) Reclassified from Accumulated OCI Cost of sales Cost of sales
Derivative Instruments Gain Loss Reclassification From Accumulated O C I To Income 780  
Cost of Sales [Member]
    
Derivative Instruments, Gain (Loss) [Line Items]    
Amount of Loss (Gain) Recognized in Income 1,959  
Cost of Sales [Member] | Commodity Derivatives [Member]
    
Derivative Instruments, Gain (Loss) [Line Items]    
Derivative Instruments Gain Loss Reclassification From Accumulated O C I To Income   $ (269)