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GOODWILL AND OTHER INTANGIBLES (Changes in the Carrying Amount of Goodwill) (Details) - USD ($) $ in Thousands | May 31, 2020 | Aug. 31, 2019
--- | --- | ---
Goodwill [Line Items] |  |
Goodwill, gross | $ 74,312 |
Accumulated impairment losses | (10,186) |
Goodwill, net | 64,126 | $ 64,138
Americas Recycling |  |
Goodwill [Line Items] |  |
Goodwill, gross | 9,543 |
Accumulated impairment losses | (9,543) |
Goodwill, net | 0 |
Americas Mills |  |
Goodwill [Line Items] |  |
Goodwill, gross | 4,970 |
Accumulated impairment losses | 0 |
Goodwill, net | 4,970 |
Americas Fabrication |  |
Goodwill [Line Items] |  |
Goodwill, gross | 57,428 |
Accumulated impairment losses | (493) |
Goodwill, net | 56,935 |
International Mill |  |
Goodwill [Line Items] |  |
Goodwill, gross | 2,371 |
Accumulated impairment losses | (150) |
Goodwill, net | $ 2,221 |

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