Quarterly report pursuant to Section 13 or 15(d)

Basic and Diluted Earnings Per Share (Details Textuals)

 v2.3.0.11
Basic and Diluted Earnings Per Share (Details Textuals)
In Millions
3 Months Ended
Aug. 31, 2011
Aug. 31, 2010
Basic and Diluted Earnings Per Share (Textuals) [Abstract]    
Common stock issued related to exercises or vesting of stock-based awards 0.3 0.2