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SEGMENT INFORMATION (External Net Sales from Continuing Operations by Major Product) (Details) - USD ($) $ in Thousands	12 Months Ended
	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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