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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, 2020 | May 31, 2019 | May 31, 2018
Effective Income Tax Rate Reconciliation, Percent [Abstract] |  |  |
Computed federal statutory provision | 21.00% | 21.00% | 29.20%
State income tax provision, net of federal income tax benefit | 2.00% | 25.70% | 37.10%
Difference in effective tax rates on earnings of foreign subsidiaries | 1.80% | 2.30% | (1.30%)
Rate differential on net operating loss carrybacks | 34.20% |  |
GILTI inclusion | (2.40%) | 3.40% | 0.00%
Charitable contributions | 0.10% | (0.60%) | 28.60%
Tax credits | 0.80% | (3.10%) | 42.80%
Valuation allowances | (1.10%) | 2.30% | 68.10%
Uncertain positions | (2.30%) | (6.30%) | 110.30%
Remeasurement of deferred tax balances | 0.00% | 0.00% | (371.30%)
Permanent differences | (1.10%) | 0.10% | (177.60%)
Other | (1.70%) | (4.80%) | 0.80%
Effective tax rates | 51.30% | 40.00% | (233.30%)
Total provision (benefit) for income taxes | $ (46.0) | $ 10.4 | $ 3.5

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