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ACCOUNTING POLICIES - Changes to Accounting Policies (Details) - USD ($)
$ / shares in Units, $ in Thousands
 3 Months Ended 9 Months Ended
May 31, 2016
May 31, 2015
May 31, 2016
May 31, 2015
New Accounting Pronouncements or Change in Accounting Principle [Line Items]        
Earnings from continuing operations $ 35,111 $ 39,156 $ 71,593 $ 86,886
Net earnings attributable to CMC $ 19,328 $ 28,709 $ 54,893 $ 67,090
Earnings from continuing operations (in USD per share) $ 0.31 $ 0.34 $ 0.62 $ 0.74
Net earnings (in USD per share) 0.17 0.25 0.48 0.57
Earnings from continuing operations (in USD per share) 0.30 0.34 0.61 0.74
Net earnings (in USD per share) $ 0.17 $ 0.25 $ 0.47 $ 0.57
As Originally Reported        
New Accounting Pronouncements or Change in Accounting Principle [Line Items]        
Earnings from continuing operations $ 34,121 $ 67,128 $ 99,843 $ 167,181
Net earnings attributable to CMC $ 18,338 $ 56,681 $ 83,143 $ 147,385
Earnings from continuing operations (in USD per share) $ 0.30 $ 0.58 $ 0.86 $ 1.43
Net earnings (in USD per share) 0.16 0.49 0.72 1.26
Earnings from continuing operations (in USD per share) 0.29 0.58 0.85 1.42
Net earnings (in USD per share) $ 0.16 $ 0.49 $ 0.71 $ 1.25
Effect of Change        
New Accounting Pronouncements or Change in Accounting Principle [Line Items]        
Earnings from continuing operations $ 990 $ (27,972) $ (28,250) $ (80,295)
Net earnings attributable to CMC $ 990 $ (27,972) $ (28,250) $ (80,295)
Earnings from continuing operations (in USD per share) $ 0.01 $ (0.24) $ (0.24) $ (0.69)
Net earnings (in USD per share) 0.01 (0.24) (0.24) (0.69)
Earnings from continuing operations (in USD per share) 0.01 (0.24) (0.24) (0.68)
Net earnings (in USD per share) $ 0.01 $ (0.24) $ (0.24) $ (0.68)