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Net Earnings Per Share (Schedule Of Anti-Dilutive Securities Excluded From Computation Of Earnings Per Share) (Details)
3 Months Ended 6 Months Ended
Feb. 29, 2012
Feb. 28, 2011
Feb. 29, 2012
Feb. 28, 2011
Stock Options [Member]
       
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]        
Anti-dilutive securities excluded from the computation of earnings per share 36,079    24,222   
Restricted Stock Units [Member]
       
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]        
Anti-dilutive securities excluded from the computation of earnings per share 2,119    6,483 4,125