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Income Taxes (Schedule Of Differences Between Statutory Tax Rate And Effective Tax Rate) (Details)
12 Months Ended
Mar. 31, 2013
Mar. 31, 2012
Mar. 31, 2011
Income Tax Expense Reconciliation [Line Items]      
Statutory federal tax expense (benefit) rate 35.00% 35.00% (35.00%)
State taxes, net of federal benefit (5.00%) (33.50%) (5.80%)
Differences between statutory rate and foreign effective tax rate (15.20%) (33.50%) 12.30%
Valuation allowance 35.00% (195.10%) 23.70%
Research and development credits (8.60%) (39.20%) (2.40%)
Non-deductible acquisition-related costs and tax expense from integration restructurings    16.70%   
Differences between book and tax loss on strategic investments (15.20%) 0.00% (8.60%)
Expiration of statutes of limitations    (266.80%)   
Non-deductible stock-based compensation 21.50% 205.60% 12.10%
Acquisition-related contingent consideration (16.50%)      
Other (1.50%) (11.40%) 2.60%
Effective tax benefit rate 29.50% (322.20%) (1.10%)