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STOCKHOLDERS’ EQUITY AND EARNINGS PER SHARE ATTRIBUTABLE TO CMC (Narrative) (Details) - USD ($) | 3 Months Ended | 9 Months Ended |
--- | --- | --- | ---
May. 31, 2015 | May. 31, 2015 | Oct. 27, 2014
Earnings Per Share [Abstract] |  |  |
Stock repurchase program, authorized amount |  |  | $ 100,000,000.0
Stock repurchase program, shares purchased (shares) | 139,383 | 2,902,218 |
Stock repurchase program, average purchase price per share (in USD per share) | $ 15.97 | $ 14.40 |
Stock repurchase program, remaining authorized repurchase amount | $ 58,200,000 | $ 58,200,000 |

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