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Earnings (Loss) Per Share Attributable To CMC (Narrative) (Details) In Millions, unless otherwise specified	12 Months Ended
	Aug. 31, 2013	Aug. 31, 2012	Aug. 31, 2011
Earnings Per Share [Abstract]
Number of antidilutive securities excluded from computation of diluted earnings per share	1.5	2.8	2.3

Securities (including those issuable pursuant to contingent stock agreements) that could potentially dilute basic earnings per share (EPS) or earnings per unit (EPU) in the future that were not included in the computation of diluted EPS or EPU because to do so would increase EPS or EPU amounts or decrease loss per share or unit amounts for the period presented.

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