v3.26.1
Taxes - Schedule of effective income tax rate reconciliation prior to ASU 2023-09 (Details) - USD ($)
$ in Millions
12 Months Ended
May 31, 2026
May 31, 2025
May 31, 2024
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 7.80% (66.50%) (3.00%)
Difference in effective tax rates on earnings of foreign subsidiaries   (61.40%) (0.10%)
GILTI inclusion 3.30% 0.00% 0.10%
Foreign derived intangible income deduction (3.30%)    
Various tax credits   62.10% (6.60%)
Valuation allowances, excluding state   93.80% 2.90%
Changes in unrecognized tax benefits 1.60% 40.70% 0.40%
Transaction costs   0.00% 12.00%
Equity and other compensation   51.60% (3.70%)
Return to provision and other adjustments   (132.80%) (5.10%)
Other nontaxable or nondeductible items 0.90% 29.00% 1.30%
Other, net   (0.20%) 0.10%
Effective tax rates 33.40% (46.20%) 25.30%
Provision (benefit) for income taxes $ 28.5 $ 0.6 $ 4.1