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CHANGES IN BUSINESS (Narrative) (Details) $ in Thousands, t in Millions |  | 9 Months Ended | 12 Months Ended
--- | --- | --- | ---
Dec. 29, 2017 USD ($) fabrication_facility t | May 31, 2018 USD ($) | Aug. 31, 2018 USD ($) | Aug. 31, 2017 USD ($) | Aug. 31, 2016 USD ($)
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |
Annual melt capacity | t | 7.2 |  |  |  |
Nonrecurring impairment charge |  |  | $ 2,100 | $ 4,200 | $ 15,800
Inventory write-downs |  |  | 1,407 | 21,529 | 15,555
Provision for losses on receivables, net |  |  | 2,510 | 6,049 | 6,878
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) | (15,800)
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 | 8,000
Provision for losses on receivables, net |  |  |  | $ 5,100 |
Stock compensation expense |  |  |  |  | $ 4,400
U.S. Rebar Steel Mill and Fabrication Assets [Member] |  |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |
Cash paid for acquisition | $ 600,000 |  |  |  |
Number of rebar fabrication facilities | fabrication_facility | 33 |  |  |  |
Annual melt capacity | t | 2.7 |  |  |  |

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