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Earnings Per Share (Tables)
3 Months Ended
Nov. 30, 2012
Earnings Per Share [Abstract]  
Computation Of Basic And Diluted Earnings Per Share
  Three months ended
November 30,
 
  2012 2011
Numerator:        
Net income $ 6,133 $ 5,499
Denominator:        
Weighted average common shares outstanding – basic   57,672   61,693
Effect of dilutive employee stock options and unvested restricted        
stock units   413   44
Weighted average common shares – diluted   58,085   61,737
 
Net income per common share – basic $ 0.11 $ 0.09
Net income per common share – diluted $ 0.11 $ 0.09
 
Anti-dilutive securities excluded(1)   4,567   7,146

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(1) Anti-dilutive securities consist of stock options and unvested restricted stock units that were not included in the computation of diluted earnings per share because either the exercise price of the options was greater than the average market price of the common stock or the total assumed proceeds under the treasury stock method resulted in negative incremental shares and thus the inclusion would have been anti-dilutive.