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Share-Based Compensation (Details) (USD $)
In Millions, unless otherwise specified
3 Months Ended 9 Months Ended
May 31, 2012
May 31, 2011
May 31, 2012
May 31, 2011
Share-Based Compensation [Abstract]        
Share-based compensation expense $ 0.8 $ 0.8 $ 2.6 $ 2.4