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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, 2023 | May 31, 2022 | May 31, 2021
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 | 4.60% | 3.10% | (10.40%)
Difference in effective tax rates on earnings of foreign subsidiaries | 0.00% | (0.20%) | 7.00%
Rate differential on net operating loss carrybacks | 0.00% | 0.00% | 19.30%
GILTI inclusion | 0.40% | 0.00% | (2.70%)
Foreign derived intangible income deduction | (1.70%) | 0.00% | 0.00%
Various tax credits | (1.50%) | (1.90%) | 6.50%
Valuation allowances | 0.00% | 0.20% | 25.70%
Uncertain positions | (0.80%) | (8.10%) | (14.60%)
Equity and other compensation | 2.90% | 1.20% | (8.70%)
Return to provision adjustments | (1.30%) | (4.40%) | 0.00%
Other, net | (0.60%) | (1.20%) | (3.00%)
Effective tax rates | 23.00% | 9.70% | 40.10%
Total provision (benefit) for income taxes | $ 25.9 | $ 8.7 | $ (7.3)

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