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) (USD $)
In Millions, unless otherwise specified
3 Months Ended 6 Months Ended
Nov. 30, 2013
Nov. 30, 2012
Nov. 30, 2013
Nov. 30, 2012
Basic And Diluted Earnings Per Share (Textual)        
Common stock issued in connection with the exercise or vesting of stock-based awards 0.9 0.3 2.8 1.1
Stock repurchase program, Authorized amount     $ 350  
Stock repurchased and retired during period, Shares 1.9   4.0  
Stock repurchased and retired during period, Value $ 75.2   $ 159.1