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STOCK-BASED COMPENSATION PLANS	6 Months Ended
STOCK-BASED COMPENSATION PLANS	Feb. 29, 2016
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]
Stock-based compensation plans	NOTE 12. STOCK-BASED COMPENSATION PLANS The Company's stock-based compensation plans are described, and informational disclosures are provided, in Note 15, Stock-Based Compensation Plans, to the consolidated financial statements in the Company's Annual Report on Form 10-K for the fiscal year ended August 31, 2015. During the six months ended February 29, 2016 and February 28, 2015, restricted stock units and performance stock units totaling 1.6 million and 1.0 million, respectively, were granted at a weighted-average fair value of $15.83 and $15.92, respectively. During the six months ended February 29, 2016 and February 28, 2015, the Company granted 464,782 and 392,517 equivalent shares, respectively, of performance stock units and restricted stock units accounted for as liability awards. The fair value of these liability awards is remeasured each reporting period and is recognized ratably over the service period. As of February 29, 2016, the Company had 917,968 equivalent shares in liability awards outstanding. The Company expects 873,789 equivalent shares to vest. In general, the restricted stock units granted during fiscal 2016 and 2015 vest ratably over a period of three years. However, certain restricted stock units granted during fiscal 2015 either vest after a period of three years or vest after a specified service period. One-third of each such award vests on the second anniversary of the grant date, and the remaining two-thirds of each such award vest on the third anniversary of the grant date. In addition, certain restricted stock units granted during fiscal 2014 vest after a specified service period. For each such award, 25% vests on the second anniversary of the grant date; 25% vests on the third anniversary of the grant date and the remaining 50% vests on the fourth anniversary of the grant date. Subject to the achievement of performance targets established by the Compensation Committee of CMC's Board of Directors, the performance stock units granted during fiscal 2016 and fiscal 2015 will vest after a period of three years. Stock-based compensation expense for the three and six months ended February 29, 2016 of $6.8 million and $13.1 million, respectively, and $6.1 million and $11.8 million for the three and six months ended February 28, 2015, respectively, was included in selling, general and administrative expenses on the Company's condensed consolidated statements of earnings.