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Earnings Per Share (Narrative) (Details)
12 Months Ended 3 Months Ended
Aug. 31, 2012
Aug. 31, 2012
Stock Options [Member]
Aug. 31, 2011
Stock Options [Member]
Aug. 31, 2010
Stock Options [Member]
Nov. 14, 2012
Knowledge Capital [Member]
Aug. 31, 2011
Knowledge Capital [Member]
Earnings Per Share [Line Items]            
Shares outstanding not included in the computation of diluted EPS 6,200,000 700,000 700,000 500,000    
Common stock warrants outstanding 4,300,000          
Common stock warrant exercise price 8.00          
Common stock warrant expiration date March 2013          
Common stock warrants issued 6,200,000       1,000,000 1,913,402
Common stock issued from treasury stock for warrant exercise         340,877 596,116