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BUSINESS SEGMENTS (Summary of Certain Financial Information from Continuing Operations by Reportable Segment) (Details) - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended |
--- | --- | --- | ---
Feb. 29, 2020 | Feb. 28, 2019 | Feb. 29, 2020 | Feb. 28, 2019 | Aug. 31, 2019
Segment Reporting Information [Line Items] |  |  |  |  |
Net sales | $ 1,340,963 | $ 1,402,783 | $ 2,725,671 | $ 2,680,125 |
Adjusted EBITDA from continuing operations | 137,721 | 69,333 | 297,526 | 134,869 |
Total assets | 3,907,938 |  | 3,907,938 |  | $ 3,758,771
Continuing Operations |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Net sales | 1,340,963 | 1,402,783 | 2,725,671 | 2,680,125 |
Americas Recycling |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Net sales | 179,535 | 225,888 | 351,686 | 466,069 |
Americas Mills |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Net sales | 471,367 | 472,795 | 945,559 | 846,466 |
Americas Fabrication |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Net sales | 510,381 | 526,678 | 1,080,758 | 961,236 |
International Mill |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Net sales | 179,656 | 174,945 | 344,696 | 401,618 |
Corporate |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Net sales | 24 | 2,477 | 2,972 | 4,736 |
Intersegment | Continuing Operations |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Net sales | 0 | 0 | 0 | 0 |
Intersegment | Americas Recycling |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Net sales | 68,549 | 61,187 | 118,659 | 123,015 |
Intersegment | Americas Mills |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Net sales | 260,673 | 301,914 | 555,374 | 530,096 |
Intersegment | Americas Fabrication |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Net sales | 1,367 | 4,158 | 2,837 | 6,711 |
Intersegment | International Mill |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Net sales | 423 | 253 | 772 | 604 |
Intersegment | Corporate |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Net sales | (331,012) | (367,512) | (677,642) | (660,426) |
Segments | Continuing Operations |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Net sales | 1,340,963 | 1,402,783 | 2,725,671 | 2,680,125 |
Adjusted EBITDA from continuing operations | 137,721 | 69,333 | 297,526 | 134,869 |
Total assets | 3,907,938 |  | 3,907,938 |  | 3,758,771
Segments | Americas Recycling |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Net sales | 248,084 | 287,075 | 470,345 | 589,084 |
Adjusted EBITDA from continuing operations | 5,754 | 10,124 | 9,171 | 25,558 |
Total assets | 261,611 |  | 261,611 |  | 257,517
Segments | Americas Mills |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Net sales | 732,040 | 774,709 | 1,500,933 | 1,376,562 |
Adjusted EBITDA from continuing operations | 125,691 | 112,396 | 280,716 | 226,269 |
Total assets | 1,680,295 |  | 1,680,295 |  | 1,667,366
Segments | Americas Fabrication |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Net sales | 511,748 | 530,836 | 1,083,595 | 967,947 |
Adjusted EBITDA from continuing operations | 16,060 | (49,578) | 33,541 | (86,574) |
Total assets | 1,065,676 |  | 1,065,676 |  | 1,106,420
Segments | International Mill |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Net sales | 180,079 | 175,198 | 345,468 | 402,222 |
Adjusted EBITDA from continuing operations | 13,451 | 20,537 | 24,810 | 53,316 |
Total assets | 521,678 |  | 521,678 |  | 464,177
Segments | Corporate |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Net sales | (330,988) | (365,035) | (674,670) | (655,690) |
Adjusted EBITDA from continuing operations | (23,235) | $ (24,146) | (50,712) | $ (83,700) |
Total assets | $ 378,678 |  | $ 378,678 |  | $ 263,291

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