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BUSINESS SEGMENTS (Summary of Certain Financial Information from Continuing Operations by Reportable Segment) (Details) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended |
--- | --- | --- | ---
May 31, 2020 | May 31, 2019 | May 31, 2020 | May 31, 2019 | Aug. 31, 2019
Segment Reporting Information [Line Items] |  |  |  |  |
Net sales | $ 1,341,683 | $ 1,605,872 | $ 4,067,354 | $ 4,285,997 |
Adjusted EBITDA from continuing operations | 146,782 | 143,971 | 444,308 | 278,840 |
Total assets | 3,954,887 |  | 3,954,887 |  | $ 3,758,771
Continuing Operations |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Net sales | 1,341,683 | 1,605,872 | 4,067,354 | 4,285,997 |
Americas Recycling |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Net sales | 148,021 | 228,786 | 499,707 | 694,855 |
Americas Mills |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Net sales | 451,278 | 536,035 | 1,396,837 | 1,382,501 |
Americas Fabrication |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Net sales | 567,782 | 629,510 | 1,648,540 | 1,590,746 |
International Mill |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Net sales | 173,465 | 209,022 | 518,161 | 610,640 |
Corporate |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Net sales | 1,137 | 2,519 | 4,109 | 7,255 |
Intersegment | Continuing Operations |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Net sales | 0 | 0 | 0 | 0 |
Intersegment | Americas Recycling |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Net sales | 55,134 | 60,229 | 173,793 | 183,244 |
Intersegment | Americas Mills |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Net sales | 289,534 | 330,868 | 844,908 | 860,964 |
Intersegment | Americas Fabrication |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Net sales | 1,466 | 3,537 | 4,303 | 10,248 |
Intersegment | International Mill |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Net sales | 352 | 343 | 1,124 | 947 |
Intersegment | Corporate |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Net sales | (346,486) | (394,977) | (1,024,128) | (1,055,403) |
Segments | Continuing Operations |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Net sales | 1,341,683 | 1,605,872 | 4,067,354 | 4,285,997 |
Adjusted EBITDA from continuing operations | 146,782 | 143,971 | 444,308 | 278,840 |
Total assets | 3,954,887 |  | 3,954,887 |  | 3,758,771
Segments | Americas Recycling |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Net sales | 203,155 | 289,015 | 673,500 | 878,099 |
Adjusted EBITDA from continuing operations | (1,664) | 12,331 | 7,507 | 37,889 |
Total assets | 216,270 |  | 216,270 |  | 257,517
Segments | Americas Mills |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Net sales | 740,812 | 866,903 | 2,241,745 | 2,243,465 |
Adjusted EBITDA from continuing operations | 133,174 | 158,114 | 413,890 | 384,383 |
Total assets | 1,609,574 |  | 1,609,574 |  | 1,667,366
Segments | Americas Fabrication |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Net sales | 569,248 | 633,047 | 1,652,843 | 1,600,994 |
Adjusted EBITDA from continuing operations | 31,896 | (23,289) | 65,437 | (109,863) |
Total assets | 1,052,324 |  | 1,052,324 |  | 1,106,420
Segments | International Mill |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Net sales | 173,817 | 209,365 | 519,285 | 611,587 |
Adjusted EBITDA from continuing operations | 14,270 | 24,120 | 39,080 | 77,436 |
Total assets | 506,192 |  | 506,192 |  | 464,177
Segments | Corporate |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Net sales | (345,349) | (392,458) | (1,020,019) | (1,048,148) |
Adjusted EBITDA from continuing operations | (30,894) | $ (27,305) | (81,606) | $ (111,005) |
Total assets | $ 570,527 |  | $ 570,527 |  | $ 263,291

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