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ACCOUNTING POLICIES - Changes to Accounting Method (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 | Aug. 31, 2015
Condensed Consolidated Statement of Earnings for the quarter and YTD period: |  |  |  |  |
Cost of goods sold | $ 884,876 | $ 1,244,042 | $ 1,882,118 | $ 2,744,109 |
Income taxes | 2,064 | 4,756 | 13,836 | 17,974 |
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 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 |
Earnings Per Share, Diluted, Other Disclosures [Abstract] |  |  |  |  |
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 |
Condensed Consolidated Balance Sheet as of August 31, 2015: |  |  |  |  |
Inventories, net | $ 753,695 |  | $ 753,695 |  | $ 880,484
Current deferred tax assets | 0 |  | 0 |  | 3,310
Accrued expenses and other payables | 210,670 |  | 210,670 |  | 290,677
Retained earnings | 1,381,294 |  | 1,381,294 |  | 1,373,568
Condensed Consolidated Statement of Cash Flows for the six months ended February 28, 2015: |  |  |  |  |
Net earnings | 10,502 | $ 6,197 | 35,565 | $ 38,381 |
Deferred income taxes |  |  | (4,614) | (8,946) |
Inventories working capital change |  |  | 111,544 | (174,990) |
Accounts payable, accrued expenses and other payables working capital change |  |  | (115,002) | (159,978) |
As Originally Reported |  |  |  |  |
Condensed Consolidated Statement of Earnings for the quarter and YTD period: |  |  |  |  |
Cost of goods sold |  | 1,169,703 |  | 2,663,472 |
Income taxes |  | 30,841 |  | 46,288 |
Earnings from continuing operations | $ 27,625 | 61,719 | $ 65,721 | 100,053 |
Net earnings attributable to CMC |  | $ 54,451 |  | $ 90,704 |
Basic earnings 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 |
Earnings Per Share, Diluted, Other Disclosures [Abstract] |  |  |  |  |
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 |
Condensed Consolidated Balance Sheet as of August 31, 2015: |  |  |  |  |
Inventories, net |  |  |  |  | 781,371
Current deferred tax assets |  |  |  |  | 29,137
Accrued expenses and other payables |  |  |  |  | 279,415
Retained earnings |  |  |  |  | 1,311,544
Condensed Consolidated Statement of Cash Flows for the six months ended February 28, 2015: |  |  |  |  |
Net earnings |  |  |  | $ 90,704 |
Deferred income taxes |  |  |  | 20,401 |
Inventories working capital change |  |  |  | (252,430) |
Accounts payable, accrued expenses and other payables working capital change |  |  |  | (160,628) |
Effect of Change |  |  |  |  |
Condensed Consolidated Statement of Earnings for the quarter and YTD period: |  |  |  |  |
Cost of goods sold |  | $ 74,339 |  | 80,637 |
Income taxes |  | (26,085) |  | (28,314) |
Earnings from continuing operations | $ (16,776) | (48,254) | $ (29,239) | (52,323) |
Net earnings attributable to CMC |  | $ (48,254) |  | $ (52,323) |
Basic earnings 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) |
Earnings Per Share, Diluted, Other Disclosures [Abstract] |  |  |  |  |
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) |
Condensed Consolidated Balance Sheet as of August 31, 2015: |  |  |  |  |
Inventories, net |  |  |  |  | 99,113
Current deferred tax assets |  |  |  |  | (25,827)
Accrued expenses and other payables |  |  |  |  | 11,262
Retained earnings |  |  |  |  | $ 62,024
Condensed Consolidated Statement of Cash Flows for the six months ended February 28, 2015: |  |  |  |  |
Net earnings |  |  |  | $ (52,323) |
Deferred income taxes |  |  |  | (29,347) |
Inventories working capital change |  |  |  | 77,440 |
Accounts payable, accrued expenses and other payables working capital change |  |  |  | $ 650 |

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