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Taxes - Schedule of effective income tax rate reconciliation (Details) - USD ($) $ in Millions | 12 Months Ended
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May 31, 2024 | May 31, 2023 | May 31, 2022
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 | (3.00%) | 4.60% | 3.10%
Difference in effective tax rates on earnings of foreign subsidiaries | (0.10%) | 0.00% | (0.20%)
GILTI inclusion | 0.10% | 0.40% | 0.00%
Foreign derived intangible income deduction | 0.00% | (1.70%) | 0.00%
Various tax credits | (6.60%) | (1.50%) | (1.90%)
Valuation allowances | 2.90% | 0.00% | 0.20%
Uncertain positions | 0.40% | (0.80%) | (8.10%)
Transaction costs | 12.00% | 0.00% | 0.00%
Equity and other compensation | 2.30% | 2.90% | 1.20%
Return to provision adjustments | (5.10%) | (1.30%) | (4.40%)
Other, net | 1.40% | (0.60%) | (1.20%)
Effective tax rates | 25.30% | 23.00% | 9.70%
Total provision (benefit) for income taxes | $ 4.1 | $ 25.9 | $ 8.7

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