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CHANGES IN BUSINESS (Narrative) (Details) $ in Thousands | 9 Months Ended | 12 Months Ended |
--- | --- | --- | ---
May 31, 2018 USD ($) | Aug. 31, 2019 USD ($) | Aug. 31, 2018 USD ($) | Aug. 31, 2017 USD ($) | Nov. 05, 2018 fabrication_facility
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |
Number of rebar fabrication facilities | fabrication_facility |  |  |  |  | 33
Inventory write-downs |  | $ 723 | $ 1,407 | $ 21,529 |
Provision for losses on receivables, net |  | 388 | 2,510 | 6,049 |
Severance expense related to discontinued operations |  | 900 | 6,700 | 17,500 |
Structural Steel Fabrication Operations |  |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |
Proceeds from sale of business |  |  | 20,300 |  |
Nonrecurring impairment charge |  | $ 13,700 |  |  |
Australian Steel Trading Business |  |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |
Pre-tax gain (loss) | $ (5,300) |  |  |  |
Currency translation gain (loss) |  |  | (2,100) | (4,200) |
International Marketing and Distribution |  |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |
Inventory write-downs |  |  | $ 1,200 | 20,700 |
Provision for losses on receivables, net |  |  |  | $ 5,100 |

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