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REVENUE RECOGNITION - Disaggregation of Revenue (Details) - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended
--- | --- | ---
Feb. 29, 2020 | Feb. 28, 2019 | Feb. 29, 2020 | Feb. 28, 2019
Disaggregation of Revenue [Line Items] |  |  |  |
Net sales | $ 1,340,963 | $ 1,402,783 | $ 2,725,671 | $ 2,680,125
Steel Products |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Net sales | 1,050,836 | 1,075,026 | 2,149,785 | 2,015,807
Ferrous Scrap |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Net sales | 77,074 | 114,252 | 142,336 | 235,323
Nonferrous Scrap |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Net sales | 118,646 | 125,836 | 237,212 | 260,032
Construction Materials |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Net sales | 66,122 | 60,190 | 133,588 | 117,361
Other |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Net sales | 28,285 | 27,479 | 62,750 | 51,602
Americas Recycling |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Net sales | 179,535 | 225,888 | 351,686 | 466,069
Americas Recycling | Steel Products |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Net sales | 140 | 202 | 255 | 441
Americas Recycling | Ferrous Scrap |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Net sales | 66,040 | 105,253 | 124,342 | 216,907
Americas Recycling | Nonferrous Scrap |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Net sales | 112,862 | 120,004 | 226,080 | 248,079
Americas Recycling | Construction Materials |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Net sales | 0 | 0 | 0 | 0
Americas Recycling | Other |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Net sales | 493 | 429 | 1,009 | 642
Americas Mills |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Net sales | 471,367 | 472,795 | 945,559 | 846,466
Americas Mills | Steel Products |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Net sales | 437,648 | 444,327 | 878,811 | 792,292
Americas Mills | Ferrous Scrap |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Net sales | 10,874 | 8,744 | 17,622 | 17,886
Americas Mills | Nonferrous Scrap |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Net sales | 3,535 | 3,308 | 6,890 | 6,488
Americas Mills | Construction Materials |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Net sales | 0 | 0 | 0 | 0
Americas Mills | Other |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Net sales | 19,310 | 16,416 | 42,236 | 29,800
Americas Fabrication |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Net sales | 510,381 | 526,678 | 1,080,758 | 961,236
Americas Fabrication | Steel Products |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Net sales | 441,765 | 462,963 | 941,492 | 837,770
Americas Fabrication | Ferrous Scrap |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Net sales | 1 | 0 | 1 | 0
Americas Fabrication | Nonferrous Scrap |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Net sales | 0 | 0 | 0 | 0
Americas Fabrication | Construction Materials |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Net sales | 66,122 | 60,190 | 133,588 | 117,361
Americas Fabrication | Other |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Net sales | 2,493 | 3,525 | 5,677 | 6,105
International Mill |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Net sales | 179,656 | 174,945 | 344,696 | 401,618
International Mill | Steel Products |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Net sales | 171,283 | 167,534 | 329,227 | 385,304
International Mill | Ferrous Scrap |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Net sales | 159 | 255 | 371 | 530
International Mill | Nonferrous Scrap |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Net sales | 2,249 | 2,524 | 4,242 | 5,465
International Mill | Construction Materials |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Net sales | 0 | 0 | 0 | 0
International Mill | Other |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Net sales | 5,965 | 4,632 | 10,856 | 10,319
Corporate |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Net sales | 24 | 2,477 | 2,972 | 4,736
Corporate | Steel Products |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Net sales | 0 | 0 | 0 | 0
Corporate | Ferrous Scrap |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Net sales | 0 | 0 | 0 | 0
Corporate | Nonferrous Scrap |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Net sales | 0 | 0 | 0 | 0
Corporate | Construction Materials |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Net sales | 0 | 0 | 0 | 0
Corporate | Other |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Net sales | $ 24 | $ 2,477 | $ 2,972 | $ 4,736

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