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Derivative Financial Instruments Foreign Currency Contracts (Details) (Foreign Exchange Contract [Member], Not Designated as Hedging Instrument [Member], Cost of goods and services sold [Member], USD $)
In Thousands, unless otherwise specified
3 Months Ended 6 Months Ended
Sep. 30, 2013
Sep. 30, 2012
Sep. 30, 2013
Sep. 30, 2012
Foreign Exchange Contract [Member] | Not Designated as Hedging Instrument [Member] | Cost of goods and services sold [Member]
       
Derivative Instruments, Gain (Loss) [Line Items]        
Gain (Loss) Recognized in Income $ 607 $ (295) $ (2,673) $ (13,250)