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Financing Arrangement (Convertible Note Hedge and Warrants Issuance) (Details) - $ / shares
shares in Thousands
12 Months Ended
Mar. 31, 2017
Mar. 31, 2016
Jul. 14, 2011
Financing Arrangement [Line Items]      
Investment Warrants Expiration Date Range End Jan. 12, 2017    
Exercise of convertible note hedge 2,900    
Convertible Note Hedge - Underlying [Member]      
Financing Arrangement [Line Items]      
Shares covered by warrants issuance     19,900
Warrants - Underlying [Member]      
Financing Arrangement [Line Items]      
Shares covered by warrants issuance     19,900
Warrant [Member]      
Financing Arrangement [Line Items]      
Strike price of warrants     $ 41.14
Convertible Debt      
Financing Arrangement [Line Items]      
Debt Instrument, Convertible, Conversion Price     $ 31.74
Common Stock      
Financing Arrangement [Line Items]      
Settlement of warrants 9,645    
Exercise of convertible note hedge 2,917 7,823