Stock-Based Compensation - Summary of Stock Options Available for Grant (Detail) - shares |
12 Months Ended | |
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Mar. 31, 2018 |
Mar. 31, 2017 |
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| Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Available for Grant [Roll Forward] | ||
| Shares Available for Grant, Beginning balance | 27,238,814 | 28,418,808 |
| Granted | (1,779,904) | (1,179,994) |
| Shares Available for Grant, Ending balance | 25,458,910 | 27,238,814 |
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- Definition Share Based Compensation Arrangement By Share Based Payment Award Number Of Shares Available For Grant Granted In Period No definition available.
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- Definition Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Available for Grant [Roll Forward] No definition available.
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- Definition The difference between the maximum number of shares (or other type of equity) authorized for issuance under the plan (including the effects of amendments and adjustments), and the sum of: 1) the number of shares (or other type of equity) already issued upon exercise of options or other equity-based awards under the plan; and 2) shares (or other type of equity) reserved for issuance on granting of outstanding awards, net of cancellations and forfeitures, if applicable. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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