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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, 2017	Feb. 29, 2016	Feb. 28, 2017	Feb. 29, 2016
Earnings Per Share [Abstract]
Earnings from continuing operations attributable to CMC	$ 29,639	$ 10,849	$ 36,813	$ 36,482
Basic earnings per share:
Shares outstanding for basic earnings per share (shares)	115,736,369	115,429,550	115,415,662	115,725,896
Basic earnings per share attributable to CMC: (in USD per share)	$ 0.25	$ 0.09	$ 0.32	$ 0.32
Diluted earnings per share:
Shares outstanding for basic earnings per share (shares)	115,736,369	115,429,550	115,415,662	115,725,896
Effect of dilutive securities:
Stock-based incentive/purchase plans (shares)	1,383,839	1,078,041	1,592,296	1,276,926
Shares outstanding for diluted earnings per share (shares)	117,120,208	116,507,591	117,007,958	117,002,822
Diluted earnings per share attributable to CMC: (in USD per share)	$ 0.25	$ 0.09	$ 0.31	$ 0.31
Anti-dilutive shares not included above (shares)	0	714,342	0	714,342

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