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SEGMENT INFORMATION (External Net Sales from Continuing Operations by Major Product) (Details) - USD ($) $ in Thousands | 12 Months Ended
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Aug. 31, 2024 | Aug. 31, 2023 | Aug. 31, 2022
Entity-Wide Information, Revenue from External Customer [Line Items] |  |  |
Net sales to external customers: | $ 7,925,972 | $ 8,799,533 | $ 8,913,481
Segments |  |  |
Entity-Wide Information, Revenue from External Customer [Line Items] |  |  |
Net sales to external customers: | 7,875,693 | 8,754,842 | 8,916,213
Intersegment net sales, eliminated in consolidation |  |  |
Entity-Wide Information, Revenue from External Customer [Line Items] |  |  |
Net sales to external customers: | 0 | 0 | 0
North America Steel Group |  |  |
Entity-Wide Information, Revenue from External Customer [Line Items] |  |  |
Net sales to external customers: | 6,383,106 | 6,797,827 | 6,908,900
North America Steel Group | Segments |  |  |
Entity-Wide Information, Revenue from External Customer [Line Items] |  |  |
Net sales to external customers: | 6,309,730 | 6,704,305 | 6,798,405
North America Steel Group | Intersegment net sales, eliminated in consolidation |  |  |
Entity-Wide Information, Revenue from External Customer [Line Items] |  |  |
Net sales to external customers: | 73,376 | 93,522 | 110,495
Europe Steel Group |  |  |
Entity-Wide Information, Revenue from External Customer [Line Items] |  |  |
Net sales to external customers: | 851,610 | 1,331,144 | 1,594,323
Europe Steel Group | Segments |  |  |
Entity-Wide Information, Revenue from External Customer [Line Items] |  |  |
Net sales to external customers: | 848,566 | 1,328,791 | 1,592,292
Europe Steel Group | Intersegment net sales, eliminated in consolidation |  |  |
Entity-Wide Information, Revenue from External Customer [Line Items] |  |  |
Net sales to external customers: | 3,044 | 2,353 | 2,031
Emerging Businesses Group |  |  |
Entity-Wide Information, Revenue from External Customer [Line Items] |  |  |
Net sales to external customers: | 750,754 | 744,548 | 532,389
Emerging Businesses Group | Segments |  |  |
Entity-Wide Information, Revenue from External Customer [Line Items] |  |  |
Net sales to external customers: | 717,397 | 721,746 | 525,516
Emerging Businesses Group | Intersegment net sales, eliminated in consolidation |  |  |
Entity-Wide Information, Revenue from External Customer [Line Items] |  |  |
Net sales to external customers: | 33,357 | 22,802 | 6,873
Corporate and Other |  |  |
Entity-Wide Information, Revenue from External Customer [Line Items] |  |  |
Net sales to external customers: | (59,498) | (73,986) | (122,131)
Corporate and Other | Segments |  |  |
Entity-Wide Information, Revenue from External Customer [Line Items] |  |  |
Net sales to external customers: | 50,279 | 44,691 | (2,732)
Corporate and Other | Intersegment net sales, eliminated in consolidation |  |  |
Entity-Wide Information, Revenue from External Customer [Line Items] |  |  |
Net sales to external customers: | (109,777) | (118,677) | (119,399)
Raw materials |  |  |
Entity-Wide Information, Revenue from External Customer [Line Items] |  |  |
Net sales to external customers: | 1,329,938 | 1,345,383 | 1,543,740
Raw materials | North America Steel Group | Segments |  |  |
Entity-Wide Information, Revenue from External Customer [Line Items] |  |  |
Net sales to external customers: | 1,311,995 | 1,324,373 | 1,517,962
Raw materials | Europe Steel Group | Segments |  |  |
Entity-Wide Information, Revenue from External Customer [Line Items] |  |  |
Net sales to external customers: | 17,943 | 21,010 | 25,778
Raw materials | Emerging Businesses Group | Segments |  |  |
Entity-Wide Information, Revenue from External Customer [Line Items] |  |  |
Net sales to external customers: | 0 | 0 | 0
Raw materials | Corporate and Other | Segments |  |  |
Entity-Wide Information, Revenue from External Customer [Line Items] |  |  |
Net sales to external customers: | 0 | 0 | 0
Steel products |  |  |
Entity-Wide Information, Revenue from External Customer [Line Items] |  |  |
Net sales to external customers: | 3,237,358 | 3,845,702 | 4,179,595
Steel products | North America Steel Group | Segments |  |  |
Entity-Wide Information, Revenue from External Customer [Line Items] |  |  |
Net sales to external customers: | 2,564,472 | 2,776,572 | 2,942,741
Steel products | Europe Steel Group | Segments |  |  |
Entity-Wide Information, Revenue from External Customer [Line Items] |  |  |
Net sales to external customers: | 672,886 | 1,069,130 | 1,236,854
Steel products | Emerging Businesses Group | Segments |  |  |
Entity-Wide Information, Revenue from External Customer [Line Items] |  |  |
Net sales to external customers: | 0 | 0 | 0
Steel products | Corporate and Other | Segments |  |  |
Entity-Wide Information, Revenue from External Customer [Line Items] |  |  |
Net sales to external customers: | 0 | 0 | 0
Downstream products |  |  |
Entity-Wide Information, Revenue from External Customer [Line Items] |  |  |
Net sales to external customers: | 2,496,696 | 2,729,780 | 2,540,243
Downstream products | North America Steel Group | Segments |  |  |
Entity-Wide Information, Revenue from External Customer [Line Items] |  |  |
Net sales to external customers: | 2,217,621 | 2,417,045 | 2,161,004
Downstream products | Europe Steel Group | Segments |  |  |
Entity-Wide Information, Revenue from External Customer [Line Items] |  |  |
Net sales to external customers: | 121,431 | 194,414 | 285,836
Downstream products | Emerging Businesses Group | Segments |  |  |
Entity-Wide Information, Revenue from External Customer [Line Items] |  |  |
Net sales to external customers: | 157,644 | 118,321 | 93,403
Downstream products | Corporate and Other | Segments |  |  |
Entity-Wide Information, Revenue from External Customer [Line Items] |  |  |
Net sales to external customers: | 0 | 0 | 0
Construction products |  |  |
Entity-Wide Information, Revenue from External Customer [Line Items] |  |  |
Net sales to external customers: | 290,304 | 332,940 | 322,486
Construction products | North America Steel Group | Segments |  |  |
Entity-Wide Information, Revenue from External Customer [Line Items] |  |  |
Net sales to external customers: | 0 | 0 | 0
Construction products | Europe Steel Group | Segments |  |  |
Entity-Wide Information, Revenue from External Customer [Line Items] |  |  |
Net sales to external customers: | 0 | 0 | 0
Construction products | Emerging Businesses Group | Segments |  |  |
Entity-Wide Information, Revenue from External Customer [Line Items] |  |  |
Net sales to external customers: | 290,304 | 332,940 | 322,486
Construction products | Corporate and Other | Segments |  |  |
Entity-Wide Information, Revenue from External Customer [Line Items] |  |  |
Net sales to external customers: | 0 | 0 | 0
Ground stabilization solutions |  |  |
Entity-Wide Information, Revenue from External Customer [Line Items] |  |  |
Net sales to external customers: | 250,941 | 256,148 | 100,072
Ground stabilization solutions | North America Steel Group | Segments |  |  |
Entity-Wide Information, Revenue from External Customer [Line Items] |  |  |
Net sales to external customers: | 0 | 0 | 0
Ground stabilization solutions | Europe Steel Group | Segments |  |  |
Entity-Wide Information, Revenue from External Customer [Line Items] |  |  |
Net sales to external customers: | 0 | 0 | 0
Ground stabilization solutions | Emerging Businesses Group | Segments |  |  |
Entity-Wide Information, Revenue from External Customer [Line Items] |  |  |
Net sales to external customers: | 250,941 | 256,148 | 100,072
Ground stabilization solutions | Corporate and Other | Segments |  |  |
Entity-Wide Information, Revenue from External Customer [Line Items] |  |  |
Net sales to external customers: | 0 | 0 | 0
Other |  |  |
Entity-Wide Information, Revenue from External Customer [Line Items] |  |  |
Net sales to external customers: | 320,735 | 289,580 | 227,345
Other | North America Steel Group | Segments |  |  |
Entity-Wide Information, Revenue from External Customer [Line Items] |  |  |
Net sales to external customers: | 215,642 | 186,315 | 176,698
Other | Europe Steel Group | Segments |  |  |
Entity-Wide Information, Revenue from External Customer [Line Items] |  |  |
Net sales to external customers: | 36,306 | 44,237 | 43,824
Other | Emerging Businesses Group | Segments |  |  |
Entity-Wide Information, Revenue from External Customer [Line Items] |  |  |
Net sales to external customers: | 18,508 | 14,337 | 9,555
Other | Corporate and Other | Segments |  |  |
Entity-Wide Information, Revenue from External Customer [Line Items] |  |  |
Net sales to external customers: | $ 50,279 | $ 44,691 | $ (2,732)

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