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Taxes (Details) - Schedule of effective income tax rate reconciliation - USD ($) $ in Millions	12 Months Ended
	May 31, 2017	May 31, 2016	May 31, 2015
Effective Income Tax Rate Reconciliation, Percent [Abstract]
Computed federal statutory provision	35.00%	35.00%	35.00%
State income tax provision, net of federal income tax benefit	3.30%	3.70%	4.20%
Difference in effective tax rates on earnings of foreign subsidiaries	0.00%	1.20%	3.70%
Charitable contributions	(0.30%)	(0.40%)	(1.10%)
Tax credits	(0.50%)	(0.30%)	(0.50%)
Valuation allowances	0.10%	(0.70%)	2.40%
Uncertain Positions	2.90%	3.90%	11.50%
Other - net	(0.20%)	(6.40%)	(7.00%)
Effective tax rates	40.30%	36.00%	48.20%
Total provision for income taxes	$ 35.4	$ 24.7	$ 14.4

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Percentage of charitable contributions tax rate reconciliation.

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