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