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REVENUE RECOGNITION - Disaggregation of Revenue (Details) - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended
--- | --- | ---
Feb. 28, 2019 | Feb. 28, 2018 | Feb. 28, 2019 | Feb. 28, 2018
Disaggregation of Revenue [Line Items] |  |  |  |
Net sales | $ 1,402,783 | $ 1,054,268 | $ 2,680,125 | $ 2,130,801
Steel Products |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Net sales | 1,075,026 | 699,646 | 2,015,807 | 1,401,008
Ferrous Scrap |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Net sales | 114,252 | 123,706 | 235,323 | 255,722
Nonferrous Scrap |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Net sales | 125,836 | 155,785 | 260,032 | 314,401
Construction Materials |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Net sales | 60,190 | 51,174 | 117,361 | 110,205
Other |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Net sales | 27,479 | 23,957 | 51,602 | 49,465
Americas Recycling |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Net sales | 225,888 | 265,432 | 466,069 | 539,769
Americas Recycling | Steel Products |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Net sales | 202 | 277 | 441 | 575
Americas Recycling | Ferrous Scrap |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Net sales | 105,253 | 116,313 | 216,907 | 238,960
Americas Recycling | Nonferrous Scrap |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Net sales | 120,004 | 148,425 | 248,079 | 299,377
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 | 429 | 417 | 642 | 857
Americas Mills |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Net sales | 472,795 | 262,703 | 846,466 | 509,436
Americas Mills | Steel Products |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Net sales | 444,327 | 240,024 | 792,292 | 461,586
Americas Mills | Ferrous Scrap |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Net sales | 8,744 | 7,095 | 17,886 | 16,143
Americas Mills | Nonferrous Scrap |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Net sales | 3,308 | 3,902 | 6,488 | 7,883
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 | 16,416 | 11,682 | 29,800 | 23,824
Americas Fabrication |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Net sales | 526,678 | 310,199 | 961,236 | 640,751
Americas Fabrication | Steel Products |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Net sales | 462,963 | 257,167 | 837,770 | 526,809
Americas Fabrication | Ferrous Scrap |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Net sales | 0 | 0 | 0 | 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 | 60,190 | 51,174 | 117,361 | 110,205
Americas Fabrication | Other |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Net sales | 3,525 | 1,858 | 6,105 | 3,737
International Mill |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Net sales | 174,945 | 211,484 | 401,618 | 431,696
International Mill | Steel Products |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Net sales | 167,534 | 202,178 | 385,304 | 412,038
International Mill | Ferrous Scrap |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Net sales | 255 | 298 | 530 | 619
International Mill | Nonferrous Scrap |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Net sales | 2,524 | 3,458 | 5,465 | 7,141
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 | 4,632 | 5,550 | 10,319 | 11,898
Corporate |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Net sales | 2,477 | 4,450 | 4,736 | 9,149
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 | $ 2,477 | $ 4,450 | $ 4,736 | $ 9,149

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