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Equity Compensation Plans - Additional Information (Detail) - USD ($) | 12 Months Ended
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May 31, 2023 | May 31, 2022 | May 31, 2021
Share-Based Compensation Arrangement by Share-Based Payment Award [Line Items] |  |  |
Number of shares available for grant | 2,871,000 | 5,386,000 | 6,355,000
Options Exercisable, Weighted Average Exercise Price | $ 31.54 | $ 30.24 | $ 28.10
Compensation expense related to share based awards | $ 10,177,000 | $ 7,154,000 | $ 6,437,000
Remaining compensation cost to be expensed in future periods for non-vested options | $ 11,729,000 |  |
Weighted average expense recognition period | 2 years 4 months 24 days |  |
Weighted average grant date fair value | $ 13.83 | $ 37.28 | $ 34.21
Number of shares purchased by employees | 94,604 | 43,456 | 38,406
Restricted Stock Units (RSUs) |  |  |
Share-Based Compensation Arrangement by Share-Based Payment Award [Line Items] |  |  |
Weighted average expense recognition period | 2 years 8 months 12 days |  |
Restricted stock units vested- fair value | $ 820,000 | $ 1,032,000 | $ 0
Share-based Payment Arrangement, Nonvested Award, Excluding Option, Cost Not yet Recognized, Amount | $ 10,839,000 |  |
Employee Stock Purchase Plan | 2011 Employee Stock Purchase Plan |  |  |
Share-Based Compensation Arrangement by Share-Based Payment Award [Line Items] |  |  |
Number of shares available for grant | 881,323 |  |
Number of shares authorized for grant | 1,000,000 |  |
Annual maximum limit percentage of compensation to purchase shares | 5.00% |  |
Employee stock purchase plan stock price percentage | 10.00% |  |
Minimum |  |  |
Share-Based Compensation Arrangement by Share-Based Payment Award [Line Items] |  |  |
Stock option vesting period | 3 years |  |
Stock option contractual terms | 5 years |  |
Minimum | 2018 Omnibus Incentive Plan | Restricted Stock Units (RSUs) |  |  |
Share-Based Compensation Arrangement by Share-Based Payment Award [Line Items] |  |  |
Stock option vesting period | 3 years |  |
Average |  |  |
Share-Based Compensation Arrangement by Share-Based Payment Award [Line Items] |  |  |
Stock option contractual terms | 7 years |  |
Maximum |  |  |
Share-Based Compensation Arrangement by Share-Based Payment Award [Line Items] |  |  |
Stock option vesting period | 5 years |  |
Stock option contractual terms | 10 years |  |
Maximum | 2018 Omnibus Incentive Plan | Restricted Stock Units (RSUs) |  |  |
Share-Based Compensation Arrangement by Share-Based Payment Award [Line Items] |  |  |
Stock option vesting period | 5 years |  |

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