Financial Instruments (Derivative Instruments In The Consolidated Balance Sheets Utilized For Foreign Currency Risk Management Purposes) (Details) (Foreign Exchange Contract [Member], USD $) In Thousands	Sep. 30, 2011	Mar. 31, 2011
Other Current Assets [Member] | Derivative Designated As Hedging Instruments [Member]
Derivatives, Fair Value [Line Items]
Asset Derivatives	$ 1,491	$ 19,579
Other Current Assets [Member] | Derivative Not Designated As Hedging Instruments [Member]
Derivatives, Fair Value [Line Items]
Asset Derivatives	25,002	4,492
Other Current Liabilities [Member] | Derivative Designated As Hedging Instruments [Member]
Derivatives, Fair Value [Line Items]
Liability Derivatives	(33,953)	(778)
Other Current Liabilities [Member] | Derivative Not Designated As Hedging Instruments [Member]
Derivatives, Fair Value [Line Items]
Liability Derivatives	$ (23,414)	$ (6,122)