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Taxes (Details) - Schedule of effective income tax rate reconciliation - USD ($)
$ in Millions
12 Months Ended
May. 31, 2015
May. 31, 2014
May. 31, 2013
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 4.20% 43.90% (9.90%)
Difference in effective tax rates on earnings of foreign subsidiaries 3.70% (82.80%) (3.00%)
Charitable contributions (1.10%) 25.40% (36.00%)
Tax credits (0.50%) 5.90% (2.90%)
Valuation allowances 2.40% (16.00%) 70.60%
Uncertain Positions 11.50% 601.90% 0.00%
Other - net (7.00%) 65.00% (28.00%)
Effective tax rates 48.20% 678.30% 25.80%
Total provision for income taxes $ 14.4 $ (15.6) $ 1.7