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Stockholders' Equity (Narrative) (Details) - USD ($) | 12 Months Ended
--- | ---
Mar. 31, 2018 | Mar. 31, 2017 | Mar. 31, 2016
Stock-Based Awards |  |  |
Total intrinsic value of options exercised | $ 9,000,000 | $ 7,200,000 | $ 9,200,000
Unamortized stock-based compensation expense related to unvested stock awards | $ 63,900,000 |  |
Weighted average period of recognition for unrecognized compensation costs (in years) | 2 years 180 days |  |
Employee Stock Purchase Plan |  |  |
Unamortized stock-based compensation expense related to unvested stock awards | $ 500,000 |  |
Weighted average period of recognition for unrecognized compensation costs (in years) | 180 days |  |
Percentage of market value price of common stock under Employee Stock Purchase Plan | 85.00% |  |
Maximum contribution percentage amount of employee's base compensation | 10.00% |  |

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