Quarterly report pursuant to Section 13 or 15(d)

Basic and Diluted Earnings Per Share (Details Textual)

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Basic and Diluted Earnings Per Share (Details Textual)
In Millions, unless otherwise specified
3 Months Ended
Aug. 31, 2012
Aug. 31, 2011
Basic And Diluted Earnings Per Share (Textual) [Abstract]    
Common stock issued related to exercises or vesting of stock-based awards 0.8 0.3