GOODWILL AND OTHER INTANGIBLES (Changes in the Carrying Amount of Goodwill) (Details) - USD ($) $ in Thousands	9 Months Ended
	May 31, 2024	Aug. 31, 2023
Goodwill [Roll Forward]
Goodwill, gross, beginning balance	$ 396,002
Segment reassignment	0
Acquisition adjustments(1)	(2,305)
Foreign currency translation	391
Goodwill, gross, ending balance	394,088
Accumulated impairment losses, beginning balance	10,181
Segment reassignment	0
Accumulated impairment, foreign currency translation	(7)
Accumulated impairment losses, ending balance	10,188
Goodwill, net, beginning balance	385,821
Segment reassignment	0
Foreign currency translation	384
Goodwill, net, ending balance	383,900
North America
Goodwill [Roll Forward]
Goodwill, gross, beginning balance	351,441
Segment reassignment	(351,441)
Foreign currency translation	0
Goodwill, gross, ending balance	0
Accumulated impairment losses, beginning balance	10,036
Segment reassignment		$ (10,036)
Accumulated impairment, foreign currency translation	0
Accumulated impairment losses, ending balance	0
Goodwill, net, beginning balance	341,405
Segment reassignment	(341,405)
Foreign currency translation	0
Goodwill, net, ending balance	0
Europe
Goodwill [Roll Forward]
Goodwill, gross, beginning balance	44,561
Segment reassignment	(44,561)
Foreign currency translation	0
Goodwill, gross, ending balance	0
Accumulated impairment losses, beginning balance	145
Segment reassignment		$ (145)
Accumulated impairment, foreign currency translation	0
Accumulated impairment losses, ending balance	0
Goodwill, net, beginning balance	44,416
Segment reassignment	(44,416)
Foreign currency translation	0
Goodwill, net, ending balance	0
North America Steel Group
Goodwill [Roll Forward]
Goodwill, gross, beginning balance	0
Segment reassignment	126,915
Foreign currency translation	0
Goodwill, gross, ending balance	126,915
Accumulated impairment losses, beginning balance	0
Segment reassignment	(9,542)
Accumulated impairment, foreign currency translation	0
Accumulated impairment losses, ending balance	9,542
Goodwill, net, beginning balance	0
Segment reassignment	117,373
Foreign currency translation	0
Goodwill, net, ending balance	117,373
Europe Steel Group
Goodwill [Roll Forward]
Goodwill, gross, beginning balance	0
Segment reassignment	4,075
Foreign currency translation	193
Goodwill, gross, ending balance	4,268
Accumulated impairment losses, beginning balance	0
Segment reassignment	(146)
Accumulated impairment, foreign currency translation	(7)
Accumulated impairment losses, ending balance	153
Goodwill, net, beginning balance	0
Segment reassignment	3,929
Foreign currency translation	186
Goodwill, net, ending balance	4,115
Emerging Businesses Group
Goodwill [Roll Forward]
Goodwill, gross, beginning balance	0
Segment reassignment	265,012
Acquisition adjustments(1)	(2,305)
Foreign currency translation	198
Goodwill, gross, ending balance	262,905
Accumulated impairment losses, beginning balance	0
Segment reassignment	(493)
Accumulated impairment, foreign currency translation	0
Accumulated impairment losses, ending balance	493
Goodwill, net, beginning balance	0
Segment reassignment	264,519
Foreign currency translation	198
Goodwill, net, ending balance	$ 262,412