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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 |

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