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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, 2017 | Nov. 30, 2016 | Aug. 31, 2017
Segment Reporting Information [Line Items] |  |  |  |
Net sales |  | $ 1,238,519 | $ 994,091 |
Adjusted operating profit (loss) from continuing operations |  | 57,097 | 20,555 |
Total assets |  | 2,898,576 |  | $ 2,975,131
Continuing Operations |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Net sales |  | 1,238,519 | 994,091 |
Adjusted operating profit (loss) from continuing operations |  |  | 20,555 |
Total assets | [1] | 2,880,981 |  | 2,948,572
Americas Recycling |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Net sales |  | 274,330 | 154,362 |
Adjusted operating profit (loss) from continuing operations |  | 9,928 | (5,098) |
Total assets | [1] | 284,905 |  | 234,350
Americas Mills |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Net sales |  | 246,733 | 203,331 |
Adjusted operating profit (loss) from continuing operations |  | 40,764 | 36,949 |
Total assets | [1] | 1,008,618 |  | 933,022
Americas Fabrication |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Net sales |  | 330,552 | 335,277 |
Adjusted operating profit (loss) from continuing operations |  | (4,782) | 6,711 |
Total assets | [1] | 671,457 |  | 683,609
International Mill |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Net sales |  | 220,200 | 134,190 |
Adjusted operating profit (loss) from continuing operations |  | 23,393 | 9,973 |
Total assets | [1] | 461,021 |  | 462,190
International Marketing and Distribution |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Net sales |  | 162,506 | 165,181 |
Adjusted operating profit (loss) from continuing operations |  | 10,531 | (3,758) |
Total assets | [1] | 302,051 |  | 351,716
Corporate |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Net sales |  | 4,198 | 1,750 |
Adjusted operating profit (loss) from continuing operations |  | (21,168) | (24,013) |
Total assets | [1] | 661,769 |  | 677,691
Eliminations |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Net sales |  | 0 | 0 |
Adjusted operating profit (loss) from continuing operations |  | (1,569) | (209) |
Total assets | [1] | (508,840) |  | (394,006)
Intersegment | Continuing Operations |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Net sales |  | 0 | 0 |
Intersegment | Americas Recycling |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Net sales |  | 45,004 | 22,346 |
Intersegment | Americas Mills |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Net sales |  | 166,785 | 143,834 |
Intersegment | Americas Fabrication |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Net sales |  | 2,227 | 3,123 |
Intersegment | International Mill |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Net sales |  | 267 | 211 |
Intersegment | International Marketing and Distribution |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Net sales |  | 792 | 1,656 |
Intersegment | Corporate |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Net sales |  | 0 | 0 |
Intersegment | Eliminations |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Net sales |  | (215,075) | (171,170) |
Segments | Continuing Operations |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Net sales |  | 1,238,519 | 994,091 |
Adjusted operating profit (loss) from continuing operations |  | 57,097 |  |
Segments | Americas Recycling |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Net sales |  | 319,334 | 176,708 |
Segments | Americas Mills |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Net sales |  | 413,518 | 347,165 |
Segments | Americas Fabrication |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Net sales |  | 332,779 | 338,400 |
Segments | International Mill |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Net sales |  | 220,467 | 134,401 |
Segments | International Marketing and Distribution |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Net sales |  | 163,298 | 166,837 |
Segments | Corporate |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Net sales |  | 4,198 | 1,750 |
Segments | Eliminations |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Net sales |  | (215,075) | $ (171,170) |
Discontinued operations |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Assets from discontinued operations |  | $ 17,600 |  | $ 26,600
[1] | Excludes total assets from discontinued operations of $17.6 million at November 30, 2017 and $26.6 million at August 31, 2017.

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