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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, 2017 | May 31, 2016 | May 31, 2017 | May 31, 2016 | Aug. 31, 2016
Segment Reporting Information [Line Items] |  |  |  |  |  |
Net sales |  | $ 1,382,616 | $ 1,227,390 | $ 3,607,300 | $ 3,401,946 |
Adjusted operating profit (loss) from continuing operations |  | 64,848 | 60,940 | 140,471 | 146,969 |
Total assets |  | 3,274,599 |  | 3,274,599 |  | $ 3,130,869
Continuing Operations |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |
Net sales |  | 1,382,616 | 1,227,390 | 3,607,300 | 3,401,946 |
Adjusted operating profit (loss) from continuing operations |  | 64,848 | 60,940 |  | 146,969 |
Total assets | [1] | 3,274,163 |  | 3,274,163 |  | 3,124,082
Americas Recycling |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |
Net sales |  | 247,896 | 156,352 | 590,760 | 430,829 |
Adjusted operating profit (loss) from continuing operations |  | 9,286 | (1,978) | 11,954 | (16,171) |
Total assets | [1] | 282,042 |  | 282,042 |  | 188,873
Americas Mills |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |
Net sales |  | 243,934 | 227,736 | 667,872 | 634,926 |
Adjusted operating profit (loss) from continuing operations |  | 50,734 | 54,976 | 139,002 | 164,739 |
Total assets | [1] | 919,923 |  | 919,923 |  | 798,481
Americas Fabrication |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |
Net sales |  | 377,188 | 382,607 | 1,013,847 | 1,096,049 |
Adjusted operating profit (loss) from continuing operations |  | 1,808 | 22,794 | 9,025 | 58,964 |
Total assets | [1] | 706,319 |  | 706,319 |  | 659,165
International Mill |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |
Net sales |  | 167,399 | 141,043 | 435,714 | 368,949 |
Adjusted operating profit (loss) from continuing operations |  | 12,953 | 5,467 | 32,356 | 10,189 |
Total assets | [1] | 431,284 |  | 431,284 |  | 372,492
International Marketing and Distribution |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |
Net sales |  | 344,290 | 315,067 | 891,606 | 867,084 |
Adjusted operating profit (loss) from continuing operations |  | 10,164 | 892 | 15,341 | (3,570) |
Total assets | [1] | 637,953 |  | 637,953 |  | 564,068
Corporate |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |
Net sales |  | 1,909 | 4,585 | 7,501 | 4,109 |
Adjusted operating profit (loss) from continuing operations |  | (20,880) | (22,542) | (67,210) | (69,415) |
Total assets | [1] | 871,040 |  | 871,040 |  | 1,034,053
Eliminations |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |
Net sales |  | 0 | 0 | 0 | 0 |
Adjusted operating profit (loss) from continuing operations |  | 783 | 1,331 | 3 | 2,233 |
Total assets | [1] | (574,398) |  | (574,398) |  | (493,050)
Segments | Continuing Operations |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |
Net sales |  | 1,382,616 | 1,227,390 | 3,607,300 | 3,401,946 |
Adjusted operating profit (loss) from continuing operations |  |  |  | 140,471 |  |
Segments | Americas Recycling |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |
Net sales |  | 294,166 | 182,477 | 694,202 | 510,030 |
Segments | Americas Mills |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |
Net sales |  | 427,276 | 396,481 | 1,151,034 | 1,117,442 |
Segments | Americas Fabrication |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |
Net sales |  | 379,976 | 385,080 | 1,022,202 | 1,103,538 |
Segments | International Mill |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |
Net sales |  | 167,629 | 141,438 | 436,335 | 369,344 |
Segments | International Marketing and Distribution |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |
Net sales |  | 347,113 | 319,604 | 897,568 | 879,517 |
Segments | Corporate |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |
Net sales |  | 1,909 | 4,585 | 7,501 | 4,109 |
Segments | Eliminations |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |
Net sales |  | (235,453) | (202,275) | (601,542) | (582,034) |
Intersegment | Continuing Operations |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |
Net sales |  | 0 | 0 | 0 | 0 |
Intersegment | Americas Recycling |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |
Net sales |  | 46,270 | 26,125 | 103,442 | 79,201 |
Intersegment | Americas Mills |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |
Net sales |  | 183,342 | 168,745 | 483,162 | 482,516 |
Intersegment | Americas Fabrication |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |
Net sales |  | 2,788 | 2,473 | 8,355 | 7,489 |
Intersegment | International Mill |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |
Net sales |  | 230 | 395 | 621 | 395 |
Intersegment | International Marketing and Distribution |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |
Net sales |  | 2,823 | 4,537 | 5,962 | 12,433 |
Intersegment | Corporate |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |
Net sales |  | 0 | 0 | 0 | 0 |
Intersegment | Eliminations |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |
Net sales |  | (235,453) | $ (202,275) | (601,542) | $ (582,034) |
Discontinued operations |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |
Disposal Group, Including Discontinued Operation, Assets |  | $ 400 |  | $ 400 |  | $ 6,800
[1] | Excludes total assets from discontinued operations of $0.4 million at May 31, 2017 and $6.8 million at August 31, 2016.

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