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SEGMENT INFORMATION (External Net Sales from Continuing Operations by Major Product) (Details) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Aug. 31, 2025 | Aug. 31, 2024 | Aug. 31, 2023
Entity-Wide Information, Revenue from External Customer [Line Items] |  |  |
Net sales | $ 7,798,480 | $ 7,925,972 | $ 8,799,533
Segments |  |  |
Entity-Wide Information, Revenue from External Customer [Line Items] |  |  |
Net sales | 7,749,655 | 7,875,693 | 8,754,842
Eliminations |  |  |
Entity-Wide Information, Revenue from External Customer [Line Items] |  |  |
Net sales | 128,388 | 109,777 | 118,677
North America Steel Group |  |  |
Entity-Wide Information, Revenue from External Customer [Line Items] |  |  |
Net sales | 6,150,802 | 6,383,106 | 6,797,827
North America Steel Group | Segments |  |  |
Entity-Wide Information, Revenue from External Customer [Line Items] |  |  |
Net sales | 6,083,849 | 6,309,730 | 6,704,305
North America Steel Group | Eliminations |  |  |
Entity-Wide Information, Revenue from External Customer [Line Items] |  |  |
Net sales | 66,953 | 73,376 | 93,522
Emerging Businesses Group |  |  |
Entity-Wide Information, Revenue from External Customer [Line Items] |  |  |
Net sales | 806,082 | 750,754 | 744,548
Emerging Businesses Group | Segments |  |  |
Entity-Wide Information, Revenue from External Customer [Line Items] |  |  |
Net sales | 747,486 | 717,397 | 721,746
Emerging Businesses Group | Eliminations |  |  |
Entity-Wide Information, Revenue from External Customer [Line Items] |  |  |
Net sales | 58,596 | 33,357 | 22,802
Europe Steel Group |  |  |
Entity-Wide Information, Revenue from External Customer [Line Items] |  |  |
Net sales | 921,159 | 851,610 | 1,331,144
Europe Steel Group | Segments |  |  |
Entity-Wide Information, Revenue from External Customer [Line Items] |  |  |
Net sales | 918,320 | 848,566 | 1,328,791
Europe Steel Group | Eliminations |  |  |
Entity-Wide Information, Revenue from External Customer [Line Items] |  |  |
Net sales | 2,839 | 3,044 | 2,353
Corporate and Other |  |  |
Entity-Wide Information, Revenue from External Customer [Line Items] |  |  |
Net sales | (79,563) | (59,498) | (73,986)
Corporate and Other | Segments |  |  |
Entity-Wide Information, Revenue from External Customer [Line Items] |  |  |
Net sales | 48,825 | 50,279 | 44,691
Raw materials | Segments |  |  |
Entity-Wide Information, Revenue from External Customer [Line Items] |  |  |
Net sales | 1,328,612 | 1,329,938 | 1,345,383
Raw materials | North America Steel Group | Segments |  |  |
Entity-Wide Information, Revenue from External Customer [Line Items] |  |  |
Net sales | 1,305,753 | 1,311,995 | 1,324,373
Raw materials | Emerging Businesses Group | Segments |  |  |
Entity-Wide Information, Revenue from External Customer [Line Items] |  |  |
Net sales | 0 | 0 | 0
Raw materials | Europe Steel Group | Segments |  |  |
Entity-Wide Information, Revenue from External Customer [Line Items] |  |  |
Net sales | 22,859 | 17,943 | 21,010
Raw materials | Corporate and Other | 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 | 3,291,479 | 3,237,358 | 3,845,702
Steel products | North America Steel Group | Segments |  |  |
Entity-Wide Information, Revenue from External Customer [Line Items] |  |  |
Net sales | 2,564,107 | 2,564,472 | 2,776,572
Steel products | Emerging Businesses Group | Segments |  |  |
Entity-Wide Information, Revenue from External Customer [Line Items] |  |  |
Net sales | 0 | 0 | 0
Steel products | Europe Steel Group | Segments |  |  |
Entity-Wide Information, Revenue from External Customer [Line Items] |  |  |
Net sales | 727,372 | 672,886 | 1,069,130
Steel products | Corporate and Other | 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 | 2,287,011 | 2,496,696 | 2,729,780
Downstream products | North America Steel Group | Segments |  |  |
Entity-Wide Information, Revenue from External Customer [Line Items] |  |  |
Net sales | 1,993,761 | 2,217,621 | 2,417,045
Downstream products | Emerging Businesses Group | Segments |  |  |
Entity-Wide Information, Revenue from External Customer [Line Items] |  |  |
Net sales | 163,409 | 157,644 | 118,321
Downstream products | Europe Steel Group | Segments |  |  |
Entity-Wide Information, Revenue from External Customer [Line Items] |  |  |
Net sales | 129,841 | 121,431 | 194,414
Downstream products | Corporate and Other | Segments |  |  |
Entity-Wide Information, Revenue from External Customer [Line Items] |  |  |
Net sales | 0 | 0 | 0
Construction products | Segments |  |  |
Entity-Wide Information, Revenue from External Customer [Line Items] |  |  |
Net sales | 304,130 | 290,304 | 332,940
Construction products | North America Steel Group | Segments |  |  |
Entity-Wide Information, Revenue from External Customer [Line Items] |  |  |
Net sales | 0 | 0 | 0
Construction products | Emerging Businesses Group | Segments |  |  |
Entity-Wide Information, Revenue from External Customer [Line Items] |  |  |
Net sales | 304,130 | 290,304 | 332,940
Construction products | Europe Steel Group | Segments |  |  |
Entity-Wide Information, Revenue from External Customer [Line Items] |  |  |
Net sales | 0 | 0 | 0
Construction products | Corporate and Other | Segments |  |  |
Entity-Wide Information, Revenue from External Customer [Line Items] |  |  |
Net sales | 0 | 0 | 0
Ground stabilization solutions | Segments |  |  |
Entity-Wide Information, Revenue from External Customer [Line Items] |  |  |
Net sales | 261,738 | 250,941 | 256,148
Ground stabilization solutions | North America Steel Group | Segments |  |  |
Entity-Wide Information, Revenue from External Customer [Line Items] |  |  |
Net sales | 0 | 0 | 0
Ground stabilization solutions | Emerging Businesses Group | Segments |  |  |
Entity-Wide Information, Revenue from External Customer [Line Items] |  |  |
Net sales | 261,738 | 250,941 | 256,148
Ground stabilization solutions | Europe Steel Group | Segments |  |  |
Entity-Wide Information, Revenue from External Customer [Line Items] |  |  |
Net sales | 0 | 0 | 0
Ground stabilization solutions | Corporate and Other | 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 | 325,510 | 320,735 | 289,580
Other | North America Steel Group | Segments |  |  |
Entity-Wide Information, Revenue from External Customer [Line Items] |  |  |
Net sales | 220,228 | 215,642 | 186,315
Other | Emerging Businesses Group | Segments |  |  |
Entity-Wide Information, Revenue from External Customer [Line Items] |  |  |
Net sales | 18,209 | 18,508 | 14,337
Other | Europe Steel Group | Segments |  |  |
Entity-Wide Information, Revenue from External Customer [Line Items] |  |  |
Net sales | 38,248 | 36,306 | 44,237
Other | Corporate and Other | Segments |  |  |
Entity-Wide Information, Revenue from External Customer [Line Items] |  |  |
Net sales | $ 48,825 | $ 50,279 | $ 44,691

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