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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, 2018 | May 31, 2017 | May 31, 2016
Effective Income Tax Rate Reconciliation, Percent [Abstract] |  |  |
Computed federal statutory provision | 29.20% | 35.00% | 35.00%
State income tax provision, net of federal income tax benefit | 37.10% | 3.30% | 3.70%
Difference in effective tax rates on earnings of foreign subsidiaries | (1.30%) | 0.00% | 1.20%
Charitable contributions | 28.60% | (0.30%) | (0.40%)
Tax credits | 42.80% | (0.50%) | (0.30%)
Valuation allowances | 68.10% | 0.10% | (0.70%)
Uncertain Positions | 110.30% | 2.90% | 3.90%
Remeasurement of deferred tax balances | (371.30%) | 0.00% | 0.00%
Permanent Differences | (177.60%) | (0.30%) | (6.00%)
Other - net | 0.80% | 0.10% | (0.40%)
Effective tax rates | (233.30%) | 40.30% | 36.00%
Total provision for income taxes | $ 3.5 | $ 35.4 | $ 24.7

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