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Earnings Per Share (Tables)
6 Months Ended
Feb. 29, 2012
Earnings Per Share [Abstract]  
Calculation Of Basic And Diluted Earnings Per Share
    Three months ended   Six months ended
    February 29, February 28,   February 29, February 28,
    2012   2011   2012   2011
Numerator:                
Net income $ 1,677 $ 4,348 $ 7,176 $ 11,590
Denominator:                
Weighted average common shares                
outstanding – basic   60,579   61,687   61,136   61,663
Effect of dilutive employee stock options and                
unvested restricted stock units   23   178   34   146
Weighted average common shares – diluted   60,602   61,865   61,170   61,809
 
Net income per common share – basic $ 0.03 $ 0.07 $ 0.12 $ 0.19
Net income per common share – diluted $ 0.03 $ 0.07 $ 0.12 $ 0.19
 
Anti-dilutive securities excluded(1)   7,279   6,363   7,212   6,703

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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.