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Stockholders' Equity (Narrative) (Details) - USD ($) | 12 Months Ended
--- | ---
Mar. 31, 2016 | Mar. 31, 2015 | Mar. 31, 2014
Cash received from option exercises and purchases of shares under the Purchase Plans | $ 4,800,000 | $ 4,500,000 | $ 5,200,000
Stock-Based Awards |  |  |
Total intrinsic value of options exercised | 9,200,000 | $ 8,100,000 | 8,200,000
Unamortized stock-based compensation expense related to unvested stock awards | 34,800,000 |  |
Weighted average period of recognition for unrecognized compensation costs (in years) |  | 2 years 212 days |
Tax benefit attributable to stock options exercised | $ 224,000 | $ 151,000 | $ 142,000
Employee Stock Purchase Plan |  |  |
Employee Stock Purchase Plan Shares Issued | 365,555 | 282,062 | 301,303
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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