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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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