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Taxes (Details) - Schedule of effective income tax rate reconciliation - USD ($) $ in Millions	12 Months Ended
	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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