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Stockholders' Equity Stock-Based Compensation Expense By Statement Of Operations (Details) - USD ($) $ in Thousands | 12 Months Ended
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Mar. 31, 2018 | Mar. 31, 2017 | Mar. 31, 2016
Stock-based employee compensation expense related to employee stock options and employee stock purchases, net of tax | $ 29,176 | $ 21,462 | $ 16,334
Cost of service revenue |  |  |
Stock-based employee compensation expense related to employee stock options and employee stock purchases, net of tax | 1,821 | 1,732 | 1,159
Cost of product revenue |  |  |
Stock-based employee compensation expense related to employee stock options and employee stock purchases, net of tax | 0 | 0 | 0
Research and development |  |  |
Stock-based employee compensation expense related to employee stock options and employee stock purchases, net of tax | 6,418 | 3,762 | 2,914
Sales and marketing |  |  |
Stock-based employee compensation expense related to employee stock options and employee stock purchases, net of tax | 11,654 | 8,832 | 6,133
General and administrative |  |  |
Stock-based employee compensation expense related to employee stock options and employee stock purchases, net of tax | $ 9,283 | $ 7,136 | $ 6,128

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- Definition The amount of expense, net of income tax, recognized during the period arising from equity-based compensation arrangements (for example, shares of stock, unit, stock options or other equity instruments) with employees, directors and certain consultants qualifying for treatment as employees. + References No definition available. + Details
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