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Income Taxes (Schedule Of Differences Between Statutory Tax Rate And Effective Tax Rate) (Details)
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12 Months Ended | ||
|---|---|---|---|
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Mar. 31, 2015
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Mar. 31, 2014
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Mar. 31, 2013
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| Income Tax Expense Reconciliation [Line Items] | |||
| Statutory federal tax expense (benefit) rate | 35.00% | 35.00% | 35.00% |
| State taxes, net of federal benefit | 0.10% | (242.90%) | (5.00%) |
| Differences between statutory rate and foreign effective tax rate | (22.30%) | (142.90%) | (15.20%) |
| Valuation allowance | (9.20%) | 936.50% | 35.00% |
| Research and development credits | (1.10%) | (128.60%) | (8.60%) |
| Differences between book and tax loss on strategic investments | 0.00% | 0.00% | (15.20%) |
| Effective Income Tax Rate Reconciliation, Tax Settlement, Percent | (0.50%) | (657.10%) | 0.00% |
| Non-deductible stock-based compensation | 3.50% | 385.70% | 21.50% |
| Acquisition-related contingent consideration | (0.20%) | (185.70%) | (16.50%) |
| Other | 0.10% | (14.30%) | (1.50%) |
| Effective tax expense (benefit) rate | 5.40% | (14.30%) | 29.50% |