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v3.25.2

Equity - Stock based compensation and stock options (Details) | 12 Months Ended
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May 31, 2025 item $ / shares shares | May 31, 2024 $ / shares shares | May 31, 2023 $ / shares shares
2013 Stock Plan |  |  |
Stock-Based Compensation |  |  |
Total number of shares granted since inception | 6,735,595 |  |
Shares available for future grant | 1,685,319 |  |
Employee Stock Option |  |  |
Stock-Based Compensation |  |  |
Expiration term | 10 years |  |
Number of equal annual increments in which stock options are exercisable | item | 3 |  |
Commencement period after the date of grant for annual increments of stock options becoming exercisable | 1 year |  |
Granted (in shares) | 157,310 | 141,545 | 221,900
Weighted average fair value of stock options granted (in dollars per share) | $ / shares | $ 25.51 | $ 25.31 | $ 17.61
Restricted stock | Minimum |  |  |
Stock-Based Compensation |  |  |
Vesting period | 1 year |  |
Restricted stock | Maximum |  |  |
Stock-Based Compensation |  |  |
Vesting period | 3 years |  |
Performance Shares |  |  |
Stock-Based Compensation |  |  |
Vesting period | 3 years |  |

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