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STOCKHOLDERS’ EQUITY AND EARNINGS PER SHARE ATTRIBUTABLE TO CMC (Calculations of the Basic and Diluted Earnings Per Share) (Details) - USD ($)
$ / shares in Units, $ in Thousands
3 Months Ended 6 Months Ended
Feb. 28, 2019
Feb. 28, 2018
Feb. 28, 2019
Feb. 28, 2018
Earnings Per Share [Abstract]        
Earnings from continuing operations $ 14,928 $ 9,781 $ 34,348 $ 41,652
Basic earnings per share:        
Shares outstanding for basic earnings per share (shares) 117,854,335 116,808,838 117,677,422 116,524,630
Basic earnings per share attributable to CMC: (in USD per share) $ 0.13 $ 0.08 $ 0.29 $ 0.36
Diluted earnings per share:        
Shares outstanding for basic earnings per share (shares) 117,854,335 116,808,838 117,677,422 116,524,630
Effect of dilutive securities:        
Stock-based incentive/purchase plans (shares) 1,088,423 1,460,883 1,319,005 1,625,185
Shares outstanding for diluted earnings per share (shares) 118,942,758 118,269,721 118,996,427 118,149,815
Diluted earnings per share attributable to CMC: (in USD per share) $ 0.13 $ 0.08 $ 0.29 $ 0.35