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BUSINESS SEGMENTS (Summary of Certain Financial Information from Continuing Operations by Reportable Segment) (Details) - USD ($) $ in Thousands	3 Months Ended
	Nov. 30, 2018	Nov. 30, 2017	Aug. 31, 2018
Segment Reporting Information [Line Items]
Net sales	$ 1,277,342	$ 1,076,533
Adjusted EBITDA from continuing operations	65,536	79,267
Total assets	3,708,650		$ 3,328,304
Continuing Operations
Segment Reporting Information [Line Items]
Net sales	1,277,342	1,076,533
Adjusted EBITDA from continuing operations	65,536	79,267
Total assets	3,708,650		3,328,304
Americas Recycling
Segment Reporting Information [Line Items]
Net sales	240,181	274,337
Adjusted EBITDA from continuing operations	15,434	15,005
Total assets	264,142		291,838
Americas Mills
Segment Reporting Information [Line Items]
Net sales	373,671	246,733
Adjusted EBITDA from continuing operations	113,873	55,166
Total assets	1,701,353		1,115,339
Americas Fabrication
Segment Reporting Information [Line Items]
Net sales	434,558	330,552
Adjusted EBITDA from continuing operations	(36,996)	2,032
Total assets	1,145,705		739,151
International Mill
Segment Reporting Information [Line Items]
Net sales	226,673	220,212
Adjusted EBITDA from continuing operations	32,779	30,944
Total assets	501,886		485,548
Corporate
Segment Reporting Information [Line Items]
Net sales	2,259	4,699
Adjusted EBITDA from continuing operations	(59,554)	(23,880)
Total assets	95,564		$ 696,428
Segments | Continuing Operations
Segment Reporting Information [Line Items]
Net sales	1,277,342	1,076,533
Segments | Americas Recycling
Segment Reporting Information [Line Items]
Net sales	302,009	319,341
Segments | Americas Mills
Segment Reporting Information [Line Items]
Net sales	601,853	413,518
Segments | Americas Fabrication
Segment Reporting Information [Line Items]
Net sales	437,111	332,779
Segments | International Mill
Segment Reporting Information [Line Items]
Net sales	227,024	220,478
Segments | Corporate
Segment Reporting Information [Line Items]
Net sales	(290,655)	(209,583)
Intersegment | Continuing Operations
Segment Reporting Information [Line Items]
Net sales	0	0
Intersegment | Americas Recycling
Segment Reporting Information [Line Items]
Net sales	61,828	45,004
Intersegment | Americas Mills
Segment Reporting Information [Line Items]
Net sales	228,182	166,785
Intersegment | Americas Fabrication
Segment Reporting Information [Line Items]
Net sales	2,553	2,227
Intersegment | International Mill
Segment Reporting Information [Line Items]
Net sales	351	266
Intersegment | Corporate
Segment Reporting Information [Line Items]
Net sales	$ (292,914)	$ (214,282)

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