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Taxes - Schedule of effective income tax rate reconciliation (Details) - USD ($)
$ in Millions
 12 Months Ended
May 31, 2025
May 31, 2024
May 31, 2023
Effective Income Tax Rate Reconciliation, Percent [Abstract]      
Computed federal statutory provision 21.00% 21.00% 21.00%
State income tax provision, net of federal income tax benefit (66.50%) (3.00%) 4.60%
Difference in effective tax rates on earnings of foreign subsidiaries (61.40%) (0.10%) 0.20%
GILTI inclusion 0.00% 0.10% 0.40%
Foreign derived intangible income deduction 0.00% 0.00% (1.70%)
Various tax credits 62.10% (6.60%) (1.50%)
Valuation allowances, excluding state 93.80% 2.90% 0.00%
Uncertain positions 40.70% 0.40% (0.80%)
Transaction costs 0.00% 12.00% 0.00%
Equity and other compensation 51.60% (3.70%) 1.90%
Section 162(m) limitation (83.50%) 6.00% 1.00%
Return to provision and other adjustments (132.80%) (5.10%) (1.30%)
Permanent differences 29.00% 1.30% (0.60%)
Other, net (0.20%) 0.10% (0.20%)
Effective tax rates (46.20%) 25.30% 23.00%
Total provision (benefit) for income taxes $ 0.6 $ 4.1 $ 25.9