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Stockholders' Equity and Earnings (Loss) Per Share Attributable to CMC (Tables)
 3 Months Ended
Nov. 30, 2011
Stockholders' Equity and Earnings (Loss) Per Share Attributable to CMC [Abstract]  
Reconciliation of the denominators of the earnings (loss) per share
                 
    Three Months Ended
November 30,		  
    2011     2010  

Shares outstanding for basic earnings per share

     115,530,545       114,319,017  

Effect of dilutive securities:

                

Stock based incentive/purchase plans

     918,938       904,676  
   

 

 

    

 

 

  

Shares outstanding for diluted earnings per share

     116,449,483       115,223,693