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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, 2019 | May 31, 2018 | May 31, 2017
Effective Income Tax Rate Reconciliation, Percent [Abstract] |  |  |
Computed federal statutory provision | 21.00% | 29.20% | 35.00%
State income tax provision, net of federal income tax benefit | 25.70% | 37.10% | 3.30%
Difference in effective tax rates on earnings of foreign subsidiaries | 2.30% | (1.30%) | 0.00%
GILTI inclusion | 3.40% | 0.00% | 0.00%
Charitable contributions | (0.60%) | 28.60% | (0.30%)
Tax credits | (3.10%) | 42.80% | (0.50%)
Valuation allowances | 2.30% | 68.10% | 0.10%
Uncertain positions | (6.30%) | 110.30% | 2.90%
Remeasurement of deferred tax balances | 0.00% | (371.30%) | 0.00%
Permanent differences | 0.10% | (177.60%) | (0.30%)
Other - net | (4.80%) | 0.80% | 0.10%
Effective tax rates | 40.00% | (233.30%) | 40.30%
Total provision for income taxes | $ 10.4 | $ 3.5 | $ 35.4

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