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ACCOUNTING POLICIES - Changes to Accounting Method (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
Aug. 31, 2015
New Accounting Pronouncements or Change in Accounting Principle [Line Items]          
Cost of goods sold $ 1,051,910 $ 1,313,854 $ 2,934,028 $ 4,057,963  
Income taxes 10,676 22,126 24,512 40,100  
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  
Inventories, net $ 661,563   $ 661,563   $ 880,484
Current deferred tax assets 0   0   3,310
Accrued expenses and other payables 236,009   236,009   290,677
Retained earnings 1,386,875   1,386,875   1,373,568
Net earnings 19,328 $ 28,709 54,893 $ 67,090  
Deferred income taxes     9,744 (19,594)  
Inventories working capital change     205,717 2,934  
Accounts payable, accrued expenses and other payables working capital change     (64,676) (128,065)  
As Originally Reported          
New Accounting Pronouncements or Change in Accounting Principle [Line Items]          
Cost of goods sold   1,270,044   3,933,516  
Income taxes   37,964   84,252  
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  
Inventories, net         781,371
Current deferred tax assets         29,137
Accrued expenses and other payables         279,415
Retained earnings         1,311,544
Net earnings       $ 147,385  
Deferred income taxes       26,396  
Inventories working capital change       (111,675)  
Accounts payable, accrued expenses and other payables working capital change       (129,322)  
Effect of Change          
New Accounting Pronouncements or Change in Accounting Principle [Line Items]          
Cost of goods sold   $ 43,810   124,447  
Income taxes   (15,838)   (44,152)  
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)  
Inventories, net         99,113
Current deferred tax assets         (25,827)
Accrued expenses and other payables         11,262
Retained earnings         $ 62,024
Net earnings       $ (80,295)  
Deferred income taxes       (45,990)  
Inventories working capital change       114,609  
Accounts payable, accrued expenses and other payables working capital change       $ 1,257