Quarterly report pursuant to Section 13 or 15(d)

Basic and Diluted Earnings Per Share (Details Textuals)

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Basic and Diluted Earnings Per Share (Details Textuals)
In Millions, unless otherwise specified
6 Months Ended
Nov. 30, 2011
Nov. 30, 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