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
May 31, 2012
May 31, 2011
Income Taxes (Textual) [Abstract]    
Total reserve for uncertain tax positions $ 36.8 $ 34.4
Total reserve for uncertain tax positions included in long-term liabilities 35.9 34.1
Impact of uncertain tax positions, if recognized, on company's effective income tax rate $ 31.6 $ 29.2