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BUSINESS SEGMENTS (Summary of Certain Financial Information from Continuing Operations by Reportable Segment) (Details) - USD ($) $ in Thousands | 3 Months Ended |
--- | --- | ---
Nov. 30, 2018 | Nov. 30, 2017 | Aug. 31, 2018
Segment Reporting Information [Line Items] |  |  |
Net sales | $ 1,277,342 | $ 1,076,533 |
Adjusted EBITDA from continuing operations | 65,536 | 79,267 |
Total assets | 3,708,650 |  | $ 3,328,304
Continuing Operations |  |  |
Segment Reporting Information [Line Items] |  |  |
Net sales | 1,277,342 | 1,076,533 |
Adjusted EBITDA from continuing operations | 65,536 | 79,267 |
Total assets | 3,708,650 |  | 3,328,304
Americas Recycling |  |  |
Segment Reporting Information [Line Items] |  |  |
Net sales | 240,181 | 274,337 |
Adjusted EBITDA from continuing operations | 15,434 | 15,005 |
Total assets | 264,142 |  | 291,838
Americas Mills |  |  |
Segment Reporting Information [Line Items] |  |  |
Net sales | 373,671 | 246,733 |
Adjusted EBITDA from continuing operations | 113,873 | 55,166 |
Total assets | 1,701,353 |  | 1,115,339
Americas Fabrication |  |  |
Segment Reporting Information [Line Items] |  |  |
Net sales | 434,558 | 330,552 |
Adjusted EBITDA from continuing operations | (36,996) | 2,032 |
Total assets | 1,145,705 |  | 739,151
International Mill |  |  |
Segment Reporting Information [Line Items] |  |  |
Net sales | 226,673 | 220,212 |
Adjusted EBITDA from continuing operations | 32,779 | 30,944 |
Total assets | 501,886 |  | 485,548
Corporate |  |  |
Segment Reporting Information [Line Items] |  |  |
Net sales | 2,259 | 4,699 |
Adjusted EBITDA from continuing operations | (59,554) | (23,880) |
Total assets | 95,564 |  | $ 696,428
Segments | Continuing Operations |  |  |
Segment Reporting Information [Line Items] |  |  |
Net sales | 1,277,342 | 1,076,533 |
Segments | Americas Recycling |  |  |
Segment Reporting Information [Line Items] |  |  |
Net sales | 302,009 | 319,341 |
Segments | Americas Mills |  |  |
Segment Reporting Information [Line Items] |  |  |
Net sales | 601,853 | 413,518 |
Segments | Americas Fabrication |  |  |
Segment Reporting Information [Line Items] |  |  |
Net sales | 437,111 | 332,779 |
Segments | International Mill |  |  |
Segment Reporting Information [Line Items] |  |  |
Net sales | 227,024 | 220,478 |
Segments | Corporate |  |  |
Segment Reporting Information [Line Items] |  |  |
Net sales | (290,655) | (209,583) |
Intersegment | Continuing Operations |  |  |
Segment Reporting Information [Line Items] |  |  |
Net sales | 0 | 0 |
Intersegment | Americas Recycling |  |  |
Segment Reporting Information [Line Items] |  |  |
Net sales | 61,828 | 45,004 |
Intersegment | Americas Mills |  |  |
Segment Reporting Information [Line Items] |  |  |
Net sales | 228,182 | 166,785 |
Intersegment | Americas Fabrication |  |  |
Segment Reporting Information [Line Items] |  |  |
Net sales | 2,553 | 2,227 |
Intersegment | International Mill |  |  |
Segment Reporting Information [Line Items] |  |  |
Net sales | 351 | 266 |
Intersegment | Corporate |  |  |
Segment Reporting Information [Line Items] |  |  |
Net sales | $ (292,914) | $ (214,282) |

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