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Taxes (Details) - Schedule of effective income tax rate reconciliation - USD ($) $ in Millions | 12 Months Ended
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May 31, 2021 | May 31, 2020 | May 31, 2019
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 | (10.40%) | 2.00% | 25.70%
Difference in effective tax rates on earnings of foreign subsidiaries | 7.00% | 1.80% | (2.40%)
Rate differential on net operating loss carrybacks | 19.30% | 34.20% | 0.00%
GILTI inclusion | (2.70%) | (2.40%) | 3.40%
Various tax credits | 6.50% | 0.80% | (3.10%)
Valuation allowances | 25.70% | (1.10%) | 2.30%
Uncertain positions | (14.60%) | (2.30%) | (6.30%)
Equity and other compensation | (8.70%) | (0.60%) | 2.40%
Other, net | (3.00%) | (2.10%) | (3.00%)
Effective tax rates | 40.10% | 51.30% | 40.00%
Total provision (benefit) for income taxes | $ (7.3) | $ (46.0) | $ 10.4

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