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BUSINESS SEGMENTS (Summary of Certain Financial Information from Continuing Operations by Reportable Segment and Major Product) (Details) - USD ($) $ in Thousands | 3 Months Ended |
--- | --- | ---
Nov. 30, 2020 | Nov. 30, 2019 | Aug. 31, 2020
Segment Reporting Information [Line Items] |  |  |
Net sales | $ 1,391,803 | $ 1,384,708 |
Adjusted EBITDA from continuing operations | 143,633 | 159,805 |
Total assets | 4,016,668 |  | $ 4,081,728
Segments |  |  |
Segment Reporting Information [Line Items] |  |  |
Net sales | 1,391,803 | 1,384,708 |
Segments | Unaffiliated Customers |  |  |
Segment Reporting Information [Line Items] |  |  |
Net sales | 1,391,803 | 1,384,708 |
Segments | Raw material products |  |  |
Segment Reporting Information [Line Items] |  |  |
Net sales | 213,067 | 183,828 |
Segments | Steel Products |  |  |
Segment Reporting Information [Line Items] |  |  |
Net sales | 609,112 | 570,907 |
Segments | Downstream products |  |  |
Segment Reporting Information [Line Items] |  |  |
Net sales | 471,502 | 527,927 |
Segments | Other |  |  |
Segment Reporting Information [Line Items] |  |  |
Net sales | 98,122 | 102,046 |
Segments | Continuing Operations |  |  |
Segment Reporting Information [Line Items] |  |  |
Adjusted EBITDA from continuing operations | 143,633 | 159,805 |
Total assets | 4,016,668 |  | 4,081,728
Segments | North America |  |  |
Segment Reporting Information [Line Items] |  |  |
Net sales | 1,195,013 | 1,216,720 |
Adjusted EBITDA from continuing operations | 155,634 | 174,732 |
Total assets | 2,871,933 |  | 2,862,805
Segments | North America | Unaffiliated Customers |  |  |
Segment Reporting Information [Line Items] |  |  |
Net sales | 1,195,013 | 1,216,720 |
Segments | North America | Raw material products |  |  |
Segment Reporting Information [Line Items] |  |  |
Net sales | 210,237 | 181,623 |
Segments | North America | Steel Products |  |  |
Segment Reporting Information [Line Items] |  |  |
Net sales | 457,657 | 441,163 |
Segments | North America | Downstream products |  |  |
Segment Reporting Information [Line Items] |  |  |
Net sales | 437,029 | 499,727 |
Segments | North America | Other |  |  |
Segment Reporting Information [Line Items] |  |  |
Net sales | 90,090 | 94,207 |
Segments | Europe |  |  |
Segment Reporting Information [Line Items] |  |  |
Net sales | 194,596 | 165,389 |
Adjusted EBITDA from continuing operations | 14,470 | 11,359 |
Total assets | 526,023 |  | 532,850
Segments | Europe | Unaffiliated Customers |  |  |
Segment Reporting Information [Line Items] |  |  |
Net sales | 194,185 | 165,040 |
Segments | Europe | Raw material products |  |  |
Segment Reporting Information [Line Items] |  |  |
Net sales | 2,830 | 2,205 |
Segments | Europe | Steel Products |  |  |
Segment Reporting Information [Line Items] |  |  |
Net sales | 151,455 | 129,744 |
Segments | Europe | Downstream products |  |  |
Segment Reporting Information [Line Items] |  |  |
Net sales | 34,473 | 28,200 |
Segments | Europe | Other |  |  |
Segment Reporting Information [Line Items] |  |  |
Net sales | 5,427 | 4,891 |
Segments | Corporate |  |  |
Segment Reporting Information [Line Items] |  |  |
Net sales | 2,194 | 2,599 |
Adjusted EBITDA from continuing operations | (26,471) | (26,286) |
Total assets | 618,712 |  | $ 686,073
Segments | Corporate | Unaffiliated Customers |  |  |
Segment Reporting Information [Line Items] |  |  |
Net sales | 2,605 | 2,948 |
Segments | Corporate | Raw material products |  |  |
Segment Reporting Information [Line Items] |  |  |
Net sales | 0 | 0 |
Segments | Corporate | Steel Products |  |  |
Segment Reporting Information [Line Items] |  |  |
Net sales | 0 | 0 |
Segments | Corporate | Downstream products |  |  |
Segment Reporting Information [Line Items] |  |  |
Net sales | 0 | 0 |
Segments | Corporate | Other |  |  |
Segment Reporting Information [Line Items] |  |  |
Net sales | 2,605 | 2,948 |
Intersegment |  |  |
Segment Reporting Information [Line Items] |  |  |
Net sales | 0 | 0 |
Intersegment | North America |  |  |
Segment Reporting Information [Line Items] |  |  |
Net sales | 0 | 0 |
Intersegment | Europe |  |  |
Segment Reporting Information [Line Items] |  |  |
Net sales | 411 | 349 |
Intersegment | Corporate |  |  |
Segment Reporting Information [Line Items] |  |  |
Net sales | $ (411) | $ (349) |

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