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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, 2017	Nov. 30, 2016	Aug. 31, 2017
Segment Reporting Information [Line Items]
Net sales		$ 1,238,519	$ 994,091
Adjusted operating profit (loss) from continuing operations		57,097	20,555
Total assets		2,898,576		$ 2,975,131
Continuing Operations
Segment Reporting Information [Line Items]
Net sales		1,238,519	994,091
Adjusted operating profit (loss) from continuing operations			20,555
Total assets	[1]	2,880,981		2,948,572
Americas Recycling
Segment Reporting Information [Line Items]
Net sales		274,330	154,362
Adjusted operating profit (loss) from continuing operations		9,928	(5,098)
Total assets	[1]	284,905		234,350
Americas Mills
Segment Reporting Information [Line Items]
Net sales		246,733	203,331
Adjusted operating profit (loss) from continuing operations		40,764	36,949
Total assets	[1]	1,008,618		933,022
Americas Fabrication
Segment Reporting Information [Line Items]
Net sales		330,552	335,277
Adjusted operating profit (loss) from continuing operations		(4,782)	6,711
Total assets	[1]	671,457		683,609
International Mill
Segment Reporting Information [Line Items]
Net sales		220,200	134,190
Adjusted operating profit (loss) from continuing operations		23,393	9,973
Total assets	[1]	461,021		462,190
International Marketing and Distribution
Segment Reporting Information [Line Items]
Net sales		162,506	165,181
Adjusted operating profit (loss) from continuing operations		10,531	(3,758)
Total assets	[1]	302,051		351,716
Corporate
Segment Reporting Information [Line Items]
Net sales		4,198	1,750
Adjusted operating profit (loss) from continuing operations		(21,168)	(24,013)
Total assets	[1]	661,769		677,691
Eliminations
Segment Reporting Information [Line Items]
Net sales		0	0
Adjusted operating profit (loss) from continuing operations		(1,569)	(209)
Total assets	[1]	(508,840)		(394,006)
Intersegment | Continuing Operations
Segment Reporting Information [Line Items]
Net sales		0	0
Intersegment | Americas Recycling
Segment Reporting Information [Line Items]
Net sales		45,004	22,346
Intersegment | Americas Mills
Segment Reporting Information [Line Items]
Net sales		166,785	143,834
Intersegment | Americas Fabrication
Segment Reporting Information [Line Items]
Net sales		2,227	3,123
Intersegment | International Mill
Segment Reporting Information [Line Items]
Net sales		267	211
Intersegment | International Marketing and Distribution
Segment Reporting Information [Line Items]
Net sales		792	1,656
Intersegment | Corporate
Segment Reporting Information [Line Items]
Net sales		0	0
Intersegment | Eliminations
Segment Reporting Information [Line Items]
Net sales		(215,075)	(171,170)
Segments | Continuing Operations
Segment Reporting Information [Line Items]
Net sales		1,238,519	994,091
Adjusted operating profit (loss) from continuing operations		57,097
Segments | Americas Recycling
Segment Reporting Information [Line Items]
Net sales		319,334	176,708
Segments | Americas Mills
Segment Reporting Information [Line Items]
Net sales		413,518	347,165
Segments | Americas Fabrication
Segment Reporting Information [Line Items]
Net sales		332,779	338,400
Segments | International Mill
Segment Reporting Information [Line Items]
Net sales		220,467	134,401
Segments | International Marketing and Distribution
Segment Reporting Information [Line Items]
Net sales		163,298	166,837
Segments | Corporate
Segment Reporting Information [Line Items]
Net sales		4,198	1,750
Segments | Eliminations
Segment Reporting Information [Line Items]
Net sales		(215,075)	$ (171,170)
Discontinued operations
Segment Reporting Information [Line Items]
Assets from discontinued operations		$ 17,600		$ 26,600
[1] Excludes total assets from discontinued operations of $17.6 million at November 30, 2017 and $26.6 million at August 31, 2017.

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