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Income Taxes (Schedule Of Differences Between Statutory Tax Rate And Effective Tax Rate) (Details)
12 Months Ended
Mar. 31, 2016
Mar. 31, 2015
Mar. 31, 2014
Income Tax Expense Reconciliation [Line Items]      
Statutory federal tax expense (benefit) rate 35.00% 35.00% 35.00%
State taxes, net of federal benefit 0.50% 0.10% (242.90%)
Differences between statutory rate and foreign effective tax rate (22.10%) (22.30%) (142.90%)
Valuation allowance (51.70%) (9.20%) 936.50%
Research and development credits (0.60%) (1.10%) (128.60%)
Unremitted earnings of foreign subsidiaries 4.90%    
Resolution of tax matters with authorities 0.00% (0.50%) (657.10%)
Non-deductible stock-based compensation 3.10% 3.50% 385.70%
Acquisition-related contingent consideration 0.00% (0.20%) (185.70%)
Other (0.90%) 0.10% (14.30%)
Effective tax expense (benefit) rate (31.80%) 5.40% (14.30%)