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REVENUE RECOGNITION - Disaggregation of Revenue (Details) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended
--- | --- | ---
May 31, 2020 | May 31, 2019 | May 31, 2020 | May 31, 2019
Disaggregation of Revenue [Line Items] |  |  |  |
Net sales | $ 1,341,683 | $ 1,605,872 | $ 4,067,354 | $ 4,285,997
Steel Products |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Net sales | 1,080,518 | 1,256,266 | 3,230,303 | 3,272,073
Ferrous Scrap |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Net sales | 72,494 | 115,847 | 214,830 | 351,170
Nonferrous Scrap |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Net sales | 89,179 | 128,873 | 326,391 | 388,905
Construction Materials |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Net sales | 72,637 | 71,228 | 206,225 | 188,589
Other |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Net sales | 26,855 | 33,658 | 89,605 | 85,260
Americas Recycling |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Net sales | 148,021 | 228,786 | 499,707 | 694,855
Americas Recycling | Steel Products |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Net sales | 204 | 238 | 459 | 679
Americas Recycling | Ferrous Scrap |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Net sales | 63,735 | 106,404 | 188,077 | 323,311
Americas Recycling | Nonferrous Scrap |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Net sales | 83,650 | 121,581 | 309,730 | 369,660
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 | 432 | 563 | 1,441 | 1,205
Americas Mills |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Net sales | 451,278 | 536,035 | 1,396,837 | 1,382,501
Americas Mills | Steel Products |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Net sales | 420,169 | 501,925 | 1,298,980 | 1,294,217
Americas Mills | Ferrous Scrap |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Net sales | 8,698 | 8,916 | 26,320 | 26,802
Americas Mills | Nonferrous Scrap |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Net sales | 3,091 | 4,080 | 9,981 | 10,568
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 | 19,320 | 21,114 | 61,556 | 50,914
Americas Fabrication |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Net sales | 567,782 | 629,510 | 1,648,540 | 1,590,746
Americas Fabrication | Steel Products |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Net sales | 494,519 | 554,672 | 1,436,011 | 1,392,442
Americas Fabrication | Ferrous Scrap |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Net sales | 0 | 2 | 1 | 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 | 72,637 | 71,228 | 206,225 | 188,589
Americas Fabrication | Other |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Net sales | 626 | 3,608 | 6,303 | 9,713
International Mill |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Net sales | 173,465 | 209,022 | 518,161 | 610,640
International Mill | Steel Products |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Net sales | 165,626 | 199,431 | 494,853 | 584,735
International Mill | Ferrous Scrap |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Net sales | 61 | 525 | 432 | 1,055
International Mill | Nonferrous Scrap |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Net sales | 2,438 | 3,212 | 6,680 | 8,677
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 | 5,340 | 5,854 | 16,196 | 16,173
Corporate |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Net sales | 1,137 | 2,519 | 4,109 | 7,255
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 | $ 1,137 | $ 2,519 | $ 4,109 | $ 7,255

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