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Equity - Stock Options (Details) - USD ($)
$ / shares in Units, $ in Millions
 12 Months Ended
May 31, 2025
May 31, 2024
May 31, 2023
Stock options, additional disclosures      
Weighted-average remaining term (in years) for options outstanding 6 years 1 month 6 days 6 years 4 months 24 days 6 years 2 months 12 days
Weighted-average remaining term (in years) for options exercisable 5 years 6 months 5 years 6 months 5 years 2 months 12 days
Employee Stock Option      
Assumptions used in the Black-Scholes option pricing models to estimate the fair value of each stock option grant      
Risk-free interest rate 4.20% 4.10% 3.10%
Expected volatility of common stock 36.00% 42.30% 42.20%
Dividend yield 0.00% 0.00% 0.00%
Expected option term in years 4 years 10 months 24 days 5 years 1 month 6 days 5 years 2 months 12 days
Shares      
Outstanding at beginning of year (in shares) 1,004,000 1,573,000 2,045,000
Granted (in shares) 157,310 141,545 221,900
Exercised (in shares) (212,000) (706,000) (631,000)
Cancelled (in shares) (14,000) (5,000) (63,000)
Outstanding at end of year (in shares) 935,000 1,004,000 1,573,000
Options exercisable at end of year (in shares) 635,000 696,000 1,018,000
Weighted Average Exercise Price      
Outstanding at beginning of year (in dollars per share) $ 38.49 $ 33.24 $ 29.86
Exercise price (in dollars per share) 67.02 58.27 41.88
Exercised (in dollars per share) 29.81 30.67 25.31
Cancelled (in dollars per share) 60.59 48.4 33.25
Outstanding at end of year (in dollars per share) 44.94 38.49 33.24
Options exercisable at end of year (in dollars per share) $ 38.13 $ 33.95 $ 35.09
Stock options, additional disclosures      
Total fair value of stock options vested $ 2.9 $ 3.3 $ 3.6
Total intrinsic value of stock options exercised 8.0 22.5 15.5
Aggregate intrinsic value of options outstanding 16.3 32.7  
Unearned compensation not yet recognized $ 3.9    
Average remaining expensed period of unearned compensation 1 year 8 months 12 days    
Employee Stock Option | Selling, general and administrative expenses      
Stock options, additional disclosures      
Compensation expense $ 3.5 $ 3.0 $ 3.5