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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. 28, 2019 | Feb. 28, 2018 | Feb. 28, 2019 | Feb. 28, 2018 | Aug. 31, 2018
Segment Reporting Information [Line Items] |  |  |  |  |
Net sales | $ 1,402,783 | $ 1,054,268 | $ 2,680,125 | $ 2,130,801 |
Adjusted EBITDA from continuing operations | 69,333 | 64,876 | 134,869 | 144,143 |
Total assets | 3,728,692 |  | 3,728,692 |  | $ 3,328,304
Continuing Operations |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Net sales | 1,402,783 | 1,054,268 | 2,680,125 | 2,130,801 |
Adjusted EBITDA from continuing operations | 69,333 | 64,876 | 134,869 | 144,143 |
Total assets | 3,728,692 |  | 3,728,692 |  | 3,328,304
Americas Recycling |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Net sales | 225,888 | 265,432 | 466,069 | 539,769 |
Adjusted EBITDA from continuing operations | 10,124 | 17,216 | 25,558 | 32,221 |
Total assets | 275,106 |  | 275,106 |  | 291,838
Americas Mills |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Net sales | 472,795 | 262,703 | 846,466 | 509,436 |
Adjusted EBITDA from continuing operations | 112,396 | 50,219 | 226,269 | 105,385 |
Total assets | 1,730,523 |  | 1,730,523 |  | 1,115,339
Americas Fabrication |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Net sales | 526,678 | 310,199 | 961,236 | 640,751 |
Adjusted EBITDA from continuing operations | (49,578) | (8,611) | (86,574) | (6,579) |
Total assets | 1,085,078 |  | 1,085,078 |  | 739,151
International Mill |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Net sales | 174,945 | 211,484 | 401,618 | 431,696 |
Adjusted EBITDA from continuing operations | 20,537 | 32,135 | 53,316 | 63,079 |
Total assets | 507,775 |  | 507,775 |  | 485,548
Corporate |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Net sales | 2,477 | 4,450 | 4,736 | 9,149 |
Adjusted EBITDA from continuing operations | (24,146) | (26,083) | (83,700) | (49,963) |
Total assets | 130,210 |  | 130,210 |  | $ 696,428
Segments | Continuing Operations |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Net sales | 1,402,783 | 1,054,268 | 2,680,125 | 2,130,801 |
Segments | Americas Recycling |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Net sales | 287,075 | 320,627 | 589,084 | 639,968 |
Segments | Americas Mills |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Net sales | 774,709 | 425,887 | 1,376,562 | 839,405 |
Segments | Americas Fabrication |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Net sales | 530,836 | 312,973 | 967,947 | 645,752 |
Segments | International Mill |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Net sales | 175,198 | 211,765 | 402,222 | 432,242 |
Segments | Corporate |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Net sales | (365,035) | (216,984) | (655,690) | (426,566) |
Intersegment | Continuing Operations |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Net sales | 0 | 0 | 0 | 0 |
Intersegment | Americas Recycling |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Net sales | 61,187 | 55,195 | 123,015 | 100,199 |
Intersegment | Americas Mills |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Net sales | 301,914 | 163,184 | 530,096 | 329,969 |
Intersegment | Americas Fabrication |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Net sales | 4,158 | 2,774 | 6,711 | 5,001 |
Intersegment | International Mill |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Net sales | 253 | 281 | 604 | 546 |
Intersegment | Corporate |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Net sales | $ (367,512) | $ (221,434) | $ (660,426) | $ (435,715) |

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