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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

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