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Stock Plans - Additional Information (Detail) $ / shares in Units, shares in Thousands, $ in Thousands |  |  | 3 Months Ended | 12 Months Ended
--- | --- | --- | --- | ---
Oct. 22, 2020 shares | Oct. 01, 2019 | Dec. 31, 2020 $ / shares shares | Mar. 31, 2021 USD ($) stock_plan $ / shares shares | Mar. 31, 2020 USD ($) | Mar. 31, 2019 USD ($)
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |
Stock options granted, vesting period |  |  |  | 3 years |  |
Unrecognized stock-based compensation expense | $ |  |  |  | $ 120,658 |  |
Awards expected to be recognized over a weighted average period (in years) |  |  |  | 1 year 10 months 17 days |  |
Total intrinsic value of options exercised | $ |  |  |  | $ 4,306 | $ 13,428 | $ 39,502
Total fair value of restricted stock units - vested | $ |  |  |  | 72,544 | 48,221 | 82,957
Restructuring | $ |  |  |  | $ 23,471 | $ 21,348 | $ 14,765
Restricted stock units |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |
Weighted average grant date fair value, granted (in dollars per share) | $ / shares |  |  |  | $ 42.04 |  |
2016 Incentive Plan |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |
Maximum number of shares of common stock that may be delivered under plan (in shares) | shares | 8,050 |  |  |  |  |
Addition shares authorized (in shares) | shares | 1,000 |  |  |  |  |
Options available for future grant (in shares) | shares |  |  |  | 2,110 |  |
2006 Long-Term Stock Inventive Plan |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |
Number of stock incentive plans | stock_plan |  |  |  | 1 |  |
Hedvig, Inc. | Restricted stock units |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |
Number of shares Issued in acquisition | shares |  |  | 1,018 |  |  |
Weighted average grant date fair value, granted (in dollars per share) | $ / shares |  |  | $ 44.49 |  |  |
Stock options granted, vesting period |  | 3 years |  |  |  |

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