CAPITAL STOCK	12 Months Ended
Aug. 31, 2016
Stockholders' Equity Note [Abstract]
CAPITAL STOCK	NOTE 17. CAPITAL STOCK Treasury Stock During the first quarter of fiscal 2015, CMC's Board of Directors authorized a new share repurchase program under which the Company may repurchase up to $100.0 million of CMC's outstanding shares of common stock. The share repurchase program does not require us to acquire any dollar amount or number of shares of CMC's common stock and may be modified, suspended, extended or terminated at any time without prior notice. During the years ended August 31, 2016 and 2015, the Company purchased 2,255,069 and 2,902,218 shares of CMC common stock, respectively, at an average purchase price of $13.57 and $14.40 per share, respectively. The Company had remaining authorization to purchase $27.6 million of its common stock at August 31, 2016. Preferred Stock Preferred stock has a par value of $1.00 per share, with 2,000,000 shares authorized. It may be issued in series, and the shares of each series have such rights and preferences as may be fixed by CMC's Board of Directors when authorizing the issuance of that particular series. There are no shares of preferred stock outstanding.

CAPITAL STOCK

12 Months Ended

Aug. 31, 2016

Stockholders' Equity Note [Abstract]

NOTE 17. CAPITAL STOCK

Treasury Stock

During the first quarter of fiscal 2015, CMC's Board of Directors authorized a new share repurchase program under which the Company may repurchase up to $100.0 million of CMC's outstanding shares of common stock. The share repurchase program does not require us to acquire any dollar amount or number of shares of CMC's common stock and may be modified, suspended, extended or terminated at any time without prior notice. During the years ended August 31, 2016 and 2015, the Company purchased 2,255,069 and 2,902,218 shares of CMC common stock, respectively, at an average purchase price of $13.57 and $14.40 per share, respectively. The Company had remaining authorization to purchase $27.6 million of its common stock at August 31, 2016.

Preferred Stock

Preferred stock has a par value of $1.00 per share, with 2,000,000 shares authorized. It may be issued in series, and the shares of each series have such rights and preferences as may be fixed by CMC's Board of Directors when authorizing the issuance of that particular series. There are no shares of preferred stock outstanding.