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REVENUE RECOGNITION - Disaggregation of Revenue (Details) - USD ($) $ in Thousands | 3 Months Ended
--- | ---
Nov. 30, 2019 | Nov. 30, 2018
Disaggregation of Revenue [Line Items] |  |
Net sales | $ 1,384,708 | $ 1,277,342
Steel Products |  |
Disaggregation of Revenue [Line Items] |  |
Net sales | 1,098,949 | 940,781
Ferrous Scrap |  |
Disaggregation of Revenue [Line Items] |  |
Net sales | 65,262 | 121,071
Nonferrous Scrap |  |
Disaggregation of Revenue [Line Items] |  |
Net sales | 118,566 | 134,196
Construction Materials |  |
Disaggregation of Revenue [Line Items] |  |
Net sales | 67,466 | 57,171
Other |  |
Disaggregation of Revenue [Line Items] |  |
Net sales | 34,465 | 24,123
Americas Recycling |  |
Disaggregation of Revenue [Line Items] |  |
Net sales | 172,151 | 240,181
Americas Recycling | Steel Products |  |
Disaggregation of Revenue [Line Items] |  |
Net sales | 115 | 239
Americas Recycling | Ferrous Scrap |  |
Disaggregation of Revenue [Line Items] |  |
Net sales | 58,302 | 111,654
Americas Recycling | Nonferrous Scrap |  |
Disaggregation of Revenue [Line Items] |  |
Net sales | 113,218 | 128,075
Americas Recycling | Construction Materials |  |
Disaggregation of Revenue [Line Items] |  |
Net sales | 0 | 0
Americas Recycling | Other |  |
Disaggregation of Revenue [Line Items] |  |
Net sales | 516 | 213
Americas Mills |  |
Disaggregation of Revenue [Line Items] |  |
Net sales | 474,192 | 373,671
Americas Mills | Steel Products |  |
Disaggregation of Revenue [Line Items] |  |
Net sales | 441,163 | 347,965
Americas Mills | Ferrous Scrap |  |
Disaggregation of Revenue [Line Items] |  |
Net sales | 6,748 | 9,142
Americas Mills | Nonferrous Scrap |  |
Disaggregation of Revenue [Line Items] |  |
Net sales | 3,355 | 3,180
Americas Mills | Construction Materials |  |
Disaggregation of Revenue [Line Items] |  |
Net sales | 0 | 0
Americas Mills | Other |  |
Disaggregation of Revenue [Line Items] |  |
Net sales | 22,926 | 13,384
Americas Fabrication |  |
Disaggregation of Revenue [Line Items] |  |
Net sales | 570,377 | 434,558
Americas Fabrication | Steel Products |  |
Disaggregation of Revenue [Line Items] |  |
Net sales | 499,727 | 374,807
Americas Fabrication | Ferrous Scrap |  |
Disaggregation of Revenue [Line Items] |  |
Net sales | 0 | 0
Americas Fabrication | Nonferrous Scrap |  |
Disaggregation of Revenue [Line Items] |  |
Net sales | 0 | 0
Americas Fabrication | Construction Materials |  |
Disaggregation of Revenue [Line Items] |  |
Net sales | 67,466 | 57,171
Americas Fabrication | Other |  |
Disaggregation of Revenue [Line Items] |  |
Net sales | 3,184 | 2,580
International Mill |  |
Disaggregation of Revenue [Line Items] |  |
Net sales | 165,040 | 226,673
International Mill | Steel Products |  |
Disaggregation of Revenue [Line Items] |  |
Net sales | 157,944 | 217,770
International Mill | Ferrous Scrap |  |
Disaggregation of Revenue [Line Items] |  |
Net sales | 212 | 275
International Mill | Nonferrous Scrap |  |
Disaggregation of Revenue [Line Items] |  |
Net sales | 1,993 | 2,941
International Mill | Construction Materials |  |
Disaggregation of Revenue [Line Items] |  |
Net sales | 0 | 0
International Mill | Other |  |
Disaggregation of Revenue [Line Items] |  |
Net sales | 4,891 | 5,687
Corporate |  |
Disaggregation of Revenue [Line Items] |  |
Net sales | 2,948 | 2,259
Corporate | Steel Products |  |
Disaggregation of Revenue [Line Items] |  |
Net sales | 0 | 0
Corporate | Ferrous Scrap |  |
Disaggregation of Revenue [Line Items] |  |
Net sales | 0 | 0
Corporate | Nonferrous Scrap |  |
Disaggregation of Revenue [Line Items] |  |
Net sales | 0 | 0
Corporate | Construction Materials |  |
Disaggregation of Revenue [Line Items] |  |
Net sales | 0 | 0
Corporate | Other |  |
Disaggregation of Revenue [Line Items] |  |
Net sales | $ 2,948 | $ 2,259

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