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Income Taxes (Narrative) (Details) - May. 31, 2015 - USD ($)
$ in Millions
Total
Income Taxes [Abstract]  
Unrecognized tax benefits $ 3.3
Unrecognized tax benefits in interest and penalties 0.4
Increase in unrecognized tax benefits 0.9
Possible change in unrecognized tax benefits, lower bound 0.1
Possible change in unrecognized tax benefits, upper bound $ (2.7)