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STOCKHOLDERS’ EQUITY AND EARNINGS PER SHARE ATTRIBUTABLE TO CMC (Narrative) (Details) - USD ($) | 3 Months Ended | 9 Months Ended |
--- | --- | --- | ---
May 31, 2017 | May 31, 2016 | May 31, 2017 | May 31, 2016 | Nov. 30, 2014
Earnings Per Share [Abstract] |  |  |  |  |
Stock repurchase program, authorized amount |  |  |  |  | $ 100,000,000.0
Stock repurchase program, shares purchased (shares) | 0 | 0 | 0 | 2,255,069 |
Stock repurchase program, average purchase price per share (in USD per share) |  |  |  | $ 13.57 |
Stock repurchase program, remaining authorized repurchase amount | $ 27,600,000 |  | $ 27,600,000 |  |

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