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 6 Months Ended
Nov. 30, 2012
Nov. 30, 2011
Nov. 30, 2012
Nov. 30, 2011
Basic And Diluted Earnings Per Share (Textual)        
Common stock issued related to exercises or vesting of stock-based awards 0.3 0 1.1 0.3