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Taxes (Details) - Schedule of effective income tax rate reconciliation - USD ($) $ in Millions	12 Months Ended
	May 31, 2016	May 31, 2015	May 31, 2014
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	3.70%	4.20%	43.90%
Difference in effective tax rates on earnings of foreign subsidiaries	1.20%	3.70%	(82.80%)
Charitable contributions	(0.40%)	(1.10%)	25.40%
Tax credits	(0.30%)	(0.50%)	5.90%
Valuation allowances	(0.70%)	2.40%	(16.00%)
Uncertain Positions	3.90%	11.50%	601.90%
Other - net	(6.40%)	(7.00%)	65.00%
Effective tax rates	36.00%	48.20%	678.30%
Total provision for income taxes	$ 24.7	$ 14.4	$ (15.6)

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Percentage of charitable contributions tax rate reconciliation.

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