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REVENUE RECOGNITION - Disaggregation of Revenue (Details) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended
--- | --- | ---
May 31, 2019 | May 31, 2018 | May 31, 2019 | May 31, 2018
Disaggregation of Revenue [Line Items] |  |  |  |
Net sales | $ 1,605,872 | $ 1,204,484 | $ 4,285,997 | $ 3,335,285
Steel Products |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Net sales | 1,256,266 | 802,186 | 3,272,073 | 2,203,194
Ferrous Scrap |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Net sales | 115,847 | 153,213 | 351,170 | 408,935
Nonferrous Scrap |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Net sales | 128,873 | 155,820 | 388,905 | 470,221
Construction Materials |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Net sales | 71,228 | 70,436 | 188,589 | 180,641
Other |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Net sales | 33,658 | 22,829 | 85,260 | 72,294
Americas Recycling |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Net sales | 228,786 | 292,679 | 694,855 | 832,448
Americas Recycling | Steel Products |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Net sales | 238 | 319 | 679 | 894
Americas Recycling | Ferrous Scrap |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Net sales | 106,404 | 144,398 | 323,311 | 383,358
Americas Recycling | Nonferrous Scrap |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Net sales | 121,581 | 147,683 | 369,660 | 447,060
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 | 563 | 279 | 1,205 | 1,136
Americas Mills |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Net sales | 536,035 | 332,459 | 1,382,501 | 841,895
Americas Mills | Steel Products |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Net sales | 501,925 | 305,390 | 1,294,217 | 766,976
Americas Mills | Ferrous Scrap |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Net sales | 8,916 | 8,462 | 26,802 | 24,605
Americas Mills | Nonferrous Scrap |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Net sales | 4,080 | 4,851 | 10,568 | 12,734
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 | 21,114 | 13,756 | 50,914 | 37,580
Americas Fabrication |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Net sales | 629,510 | 375,183 | 1,590,746 | 1,015,934
Americas Fabrication | Steel Products |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Net sales | 554,672 | 303,363 | 1,392,442 | 830,172
Americas Fabrication | Ferrous Scrap |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Net sales | 2 | 2 | 2 | 2
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 | 71,228 | 70,436 | 188,589 | 180,641
Americas Fabrication | Other |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Net sales | 3,608 | 1,382 | 9,713 | 5,119
International Mill |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Net sales | 209,022 | 201,438 | 610,640 | 633,134
International Mill | Steel Products |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Net sales | 199,431 | 193,114 | 584,735 | 605,152
International Mill | Ferrous Scrap |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Net sales | 525 | 351 | 1,055 | 970
International Mill | Nonferrous Scrap |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Net sales | 3,212 | 3,286 | 8,677 | 10,427
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 | 5,854 | 4,687 | 16,173 | 16,585
Corporate |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Net sales | 2,519 | 2,725 | 7,255 | 11,874
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 | $ 2,519 | $ 2,725 | $ 7,255 | $ 11,874

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