Stock Award Plans and Stock-Based Compensation - Additional Information (Detail) - USD ($)
$ / shares in Units, $ in Thousands |
1 Months Ended |
12 Months Ended |
May 31, 2019 |
May 31, 2018 |
May 31, 2017 |
Mar. 31, 2020 |
Mar. 31, 2019 |
Mar. 31, 2018 |
| Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |
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| Aggregate intrinsic value of options exercised in period |
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$ 15,000
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$ 174,000
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$ 66,400
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| Proceeds from the exercise of stock options |
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$ 3,748
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$ 12,949
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$ 9,303
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| Expected dividend yield |
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0.00%
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| 2015 Stock Incentive Plan |
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| Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |
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| Stock option conversion description |
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Each share of stock issued pursuant to a stock option or stock appreciation right counts as one share against the maximum number of shares issuable under the 2015 Plan, while each share of stock issued pursuant to any other type of award counts as 1.8 shares against the maximum number of shares issuable under the 2015 Plan.
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| Shares available for future issuance under the Plan |
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3,609,512
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| Employee Stock Option |
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| Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |
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| Stock award plans, outstanding stock options expiration period |
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10 years
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| Vesting period |
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3 years
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| Unrecognized stock-based compensation expense |
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$ 12,900
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| Unrecognized stock-based compensation expense, weighted-average recognition period |
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1 year 9 months 18 days
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| Expected dividend yield |
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0.00%
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| Restricted Stock Units |
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| Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |
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| Vesting period |
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3 years
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| Unrecognized stock-based compensation expense |
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$ 23,800
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| Unrecognized stock-based compensation expense, weighted-average recognition period |
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1 year 6 months
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| Weighted average grant-date fair value |
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$ 258.59
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$ 376.95
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$ 137.40
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| Fair value of units vested |
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$ 99,300
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$ 171,300
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$ 51,000
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| Restricted share unit issued |
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161,000
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| Non-vested shares, outstanding |
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320,000
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620,000
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| Performance and Market-Based Restricted Stock Units |
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| Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |
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| Unrecognized stock-based compensation expense |
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$ 4,500
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| Unrecognized stock-based compensation expense, weighted-average recognition period |
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1 year 1 month 6 days
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| Performance Based Restricted Stock Units |
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| Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |
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| Restricted share unit issued |
196,580
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114,000
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159,000
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| Performance Based Restricted Stock Units Issued in May 2018 |
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| Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |
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| Non-vested shares, outstanding |
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47,000
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| Performance Based Restricted Stock Units Issued in May 2017 |
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| Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |
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| Non-vested shares, outstanding |
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43,000
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| Performance Based Restricted Stock Units Issued in May 2019 |
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| Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |
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| Non-vested shares, outstanding |
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0
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| Employee Stock Purchase Plan |
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| Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |
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| ESPP, exercise price as a percentage of its market price |
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85.00%
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