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OPERATING SEGMENTS (External Net Sales from Continuing Operations by Major Product) (Details) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Aug. 31, 2022 | Aug. 31, 2021 | Aug. 31, 2020
Entity-Wide Information, Revenue from External Customer [Line Items] |  |  |
Net sales | $ 8,913,481 | $ 6,729,760 | $ 5,476,486
Segments | North America |  |  |
Entity-Wide Information, Revenue from External Customer [Line Items] |  |  |
Net sales | 7,298,632 | 5,670,976 | 4,769,933
Segments | Europe |  |  |
Entity-Wide Information, Revenue from External Customer [Line Items] |  |  |
Net sales | 1,621,642 | 1,049,059 | 699,140
Intersegment |  |  |
Entity-Wide Information, Revenue from External Customer [Line Items] |  |  |
Net sales | 0 | 0 | 0
Intersegment | North America |  |  |
Entity-Wide Information, Revenue from External Customer [Line Items] |  |  |
Net sales | 1,989 | 0 | 0
Intersegment | Europe |  |  |
Entity-Wide Information, Revenue from External Customer [Line Items] |  |  |
Net sales | 2,071 | 1,814 | 1,509
Corporate | Segments |  |  |
Entity-Wide Information, Revenue from External Customer [Line Items] |  |  |
Net sales | (6,793) | 9,725 | 7,413
Corporate | Intersegment |  |  |
Entity-Wide Information, Revenue from External Customer [Line Items] |  |  |
Net sales | (4,060) | (1,814) | (1,509)
Unaffiliated Customers | Segments |  |  |
Entity-Wide Information, Revenue from External Customer [Line Items] |  |  |
Net sales | 8,913,481 | 6,729,760 | 5,476,486
Unaffiliated Customers | Segments | North America |  |  |
Entity-Wide Information, Revenue from External Customer [Line Items] |  |  |
Net sales | 7,296,643 | 5,670,976 | 4,769,933
Unaffiliated Customers | Segments | Europe |  |  |
Entity-Wide Information, Revenue from External Customer [Line Items] |  |  |
Net sales | 1,619,571 | 1,047,245 | 697,631
Unaffiliated Customers | Corporate | Segments |  |  |
Entity-Wide Information, Revenue from External Customer [Line Items] |  |  |
Net sales | (2,733) | 11,539 | 8,922
Raw material products | Segments |  |  |
Entity-Wide Information, Revenue from External Customer [Line Items] |  |  |
Net sales | 1,529,366 | 1,182,838 | 728,205
Raw material products | Segments | North America |  |  |
Entity-Wide Information, Revenue from External Customer [Line Items] |  |  |
Net sales | 1,504,107 | 1,162,997 | 718,513
Raw material products | Segments | Europe |  |  |
Entity-Wide Information, Revenue from External Customer [Line Items] |  |  |
Net sales | 25,259 | 19,841 | 9,692
Raw material products | Corporate | Segments |  |  |
Entity-Wide Information, Revenue from External Customer [Line Items] |  |  |
Net sales | 0 | 0 | 0
Steel products | Segments |  |  |
Entity-Wide Information, Revenue from External Customer [Line Items] |  |  |
Net sales | 4,190,812 | 3,098,637 | 2,285,603
Steel products | Segments | North America |  |  |
Entity-Wide Information, Revenue from External Customer [Line Items] |  |  |
Net sales | 2,955,121 | 2,289,975 | 1,738,556
Steel products | Segments | Europe |  |  |
Entity-Wide Information, Revenue from External Customer [Line Items] |  |  |
Net sales | 1,235,691 | 808,662 | 547,047
Steel products | Corporate | Segments |  |  |
Entity-Wide Information, Revenue from External Customer [Line Items] |  |  |
Net sales | 0 | 0 | 0
Downstream products | Segments |  |  |
Entity-Wide Information, Revenue from External Customer [Line Items] |  |  |
Net sales | 2,537,870 | 2,006,367 | 2,062,358
Downstream products | Segments | North America |  |  |
Entity-Wide Information, Revenue from External Customer [Line Items] |  |  |
Net sales | 2,245,734 | 1,814,192 | 1,943,126
Downstream products | Segments | Europe |  |  |
Entity-Wide Information, Revenue from External Customer [Line Items] |  |  |
Net sales | 292,136 | 192,175 | 119,232
Downstream products | Corporate | Segments |  |  |
Entity-Wide Information, Revenue from External Customer [Line Items] |  |  |
Net sales | 0 | 0 | 0
Other | Segments |  |  |
Entity-Wide Information, Revenue from External Customer [Line Items] |  |  |
Net sales | 174,637 | 152,274 | 124,505
Other | Segments | North America |  |  |
Entity-Wide Information, Revenue from External Customer [Line Items] |  |  |
Net sales | 138,164 | 114,168 | 93,923
Other | Segments | Europe |  |  |
Entity-Wide Information, Revenue from External Customer [Line Items] |  |  |
Net sales | 39,206 | 26,567 | 21,660
Other | Corporate | Segments |  |  |
Entity-Wide Information, Revenue from External Customer [Line Items] |  |  |
Net sales | (2,733) | 11,539 | 8,922
Construction Related Solutions | Segments |  |  |
Entity-Wide Information, Revenue from External Customer [Line Items] |  |  |
Net sales | 480,796 | 289,644 | 275,815
Construction Related Solutions | Segments | North America |  |  |
Entity-Wide Information, Revenue from External Customer [Line Items] |  |  |
Net sales | 453,517 | 289,644 | 275,815
Construction Related Solutions | Segments | Europe |  |  |
Entity-Wide Information, Revenue from External Customer [Line Items] |  |  |
Net sales | 27,279 | 0 | 0
Construction Related Solutions | Corporate | Segments |  |  |
Entity-Wide Information, Revenue from External Customer [Line Items] |  |  |
Net sales | $ 0 | $ 0 | $ 0

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