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Equity - Stock based compensation and stock options (Details)	12 Months Ended
	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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