Annual report pursuant to Section 13 and 15(d)

Income Taxes (Details Textual)

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Income Taxes (Details Textual) (USD $)
In Millions, unless otherwise specified
12 Months Ended
May 31, 2013
May 31, 2014
Income Taxes (Details Textual) [Abstract]    
Total reserve for uncertain tax positions $ 19.8 $ 29.8
Total reserve for uncertain tax positions included in long-term liabilities 19.7 28.6
Reserve for uncertain tax positions, increase in May 2013 21.2  
Impact of uncertain tax positions, if recognized, on company's effective income tax rate $ 14.6 $ 24.6