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ACCOUNTING POLICIES - Changes to Earnings (Details) - USD ($) $ / shares in Units, $ in Thousands | 3 Months Ended | 6 Months Ended
--- | --- | ---
Feb. 29, 2016 | Feb. 28, 2015 | Feb. 29, 2016 | Feb. 28, 2015
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |
Earnings from continuing operations | $ 10,849 | $ 13,465 | $ 36,482 | $ 47,730
Net earnings attributable to CMC |  | $ 6,197 | $ 35,565 | $ 38,381
Basic earnings (loss) per share attributable to CMC: |  |  |  |
Earnings from continuing operations (in USD per share) | $ 0.09 | $ 0.12 | $ 0.32 | $ 0.41
Net earnings (in USD per share) | 0.09 | 0.06 | 0.31 | 0.33
Diluted earnings (loss) per share attributable to CMC: |  |  |  |
Earnings from continuing operations (in USD per share) | 0.09 | 0.11 | 0.31 | 0.40
Net earnings (in USD per share) | $ 0.09 | $ 0.05 | $ 0.30 | $ 0.32
As Computed Under LIFO |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |
Earnings from continuing operations | $ 27,625 | $ 61,719 | $ 65,721 | $ 100,053
Net earnings attributable to CMC |  | $ 54,451 |  | $ 90,704
Basic earnings (loss) per share attributable to CMC: |  |  |  |
Earnings from continuing operations (in USD per share) | $ 0.24 | $ 0.53 | $ 0.57 | $ 0.85
Net earnings (in USD per share) | 0.24 | 0.47 | 0.56 | 0.77
Diluted earnings (loss) per share attributable to CMC: |  |  |  |
Earnings from continuing operations (in USD per share) | 0.23 | 0.52 | 0.56 | 0.85
Net earnings (in USD per share) | $ 0.23 | $ 0.46 | $ 0.55 | $ 0.77
Effect of Change |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |
Earnings from continuing operations | $ (16,776) | $ (48,254) | $ (29,239) | $ (52,323)
Net earnings attributable to CMC |  | $ (48,254) |  | $ (52,323)
Basic earnings (loss) per share attributable to CMC: |  |  |  |
Earnings from continuing operations (in USD per share) | $ (0.15) | $ (0.41) | $ (0.25) | $ (0.44)
Net earnings (in USD per share) | (0.15) | (0.41) | (0.25) | (0.44)
Diluted earnings (loss) per share attributable to CMC: |  |  |  |
Earnings from continuing operations (in USD per share) | (0.14) | (0.41) | (0.25) | (0.45)
Net earnings (in USD per share) | $ (0.14) | $ (0.41) | $ (0.25) | $ (0.45)
Retained Earnings |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |
Net earnings attributable to CMC | $ 10,502 |  |  |
Retained Earnings | As Computed Under LIFO |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |
Net earnings attributable to CMC | 27,278 |  | $ 64,804 |
Retained Earnings | Effect of Change |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |
Net earnings attributable to CMC | $ (16,776) |  | $ (29,239) |

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