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BUSINESS SEGMENTS (Summary of Certain Financial Information from Continuing Operations by Reportable Segment) (Details) - USD ($) $ in Thousands		3 Months Ended		6 Months Ended
		Feb. 29, 2016	Feb. 28, 2015	Feb. 29, 2016	Feb. 28, 2015	Aug. 31, 2015
Segment Reporting Information [Line Items]
Net sales		$ 1,019,697	$ 1,391,117	$ 2,174,556	$ 3,071,107
Adjusted operating profit (loss)		29,968	37,885	86,029	104,876
Total assets		3,043,511		3,043,511		$ 3,445,588
Continuing Operations
Segment Reporting Information [Line Items]
Net sales		1,019,697	1,391,117	2,174,556	3,071,107
Adjusted operating profit (loss)		29,968	37,885	86,029	104,876
Total assets	[1]	3,027,360		3,027,360		3,414,063
Americas Recycling
Segment Reporting Information [Line Items]
Net sales		119,641	227,499	274,477	497,301
Adjusted operating profit (loss)		(7,645)	(9,657)	(14,193)	(11,609)
Total assets	[1]	215,705		215,705		261,676
Americas Mills
Segment Reporting Information [Line Items]
Net sales		189,549	247,727	407,190	551,586
Adjusted operating profit (loss)		50,699	59,470	109,763	132,118
Total assets	[1]	764,480		764,480		738,669
Americas Fabrication
Segment Reporting Information [Line Items]
Net sales		333,961	341,679	713,442	749,916
Adjusted operating profit (loss)		14,825	(5,769)	36,170	(9,950)
Total assets	[1]	652,267		652,267		713,860
International Mill
Segment Reporting Information [Line Items]
Net sales		107,458	138,449	227,906	316,078
Adjusted operating profit (loss)		1,951	819	4,722	5,042
Total assets	[1]	349,463		349,463		403,706
International Marketing and Distribution
Segment Reporting Information [Line Items]
Net sales		271,955	433,046	552,017	952,677
Adjusted operating profit (loss)		(2,293)	7,385	(4,462)	24,054
Total assets	[1]	642,286		642,286		798,914
Corporate
Segment Reporting Information [Line Items]
Net sales		(2,867)	2,717	(476)	3,549
Adjusted operating profit (loss)		(28,801)	(16,400)	(46,873)	(36,011)
Total assets	[1]	849,478		849,478		1,049,815
Eliminations
Segment Reporting Information [Line Items]
Net sales		0	0	0	0
Adjusted operating profit (loss)		1,232	2,037	902	1,232
Total assets	[1]	(446,319)		(446,319)		$ (552,577)
Segments | Continuing Operations
Segment Reporting Information [Line Items]
Net sales		1,019,697	1,391,117	2,174,556	3,071,107
Segments | Americas Recycling
Segment Reporting Information [Line Items]
Net sales		148,346	259,079	327,553	575,138
Segments | Americas Mills
Segment Reporting Information [Line Items]
Net sales		336,429	428,845	720,961	953,696
Segments | Americas Fabrication
Segment Reporting Information [Line Items]
Net sales		336,144	344,410	718,458	756,898
Segments | International Mill
Segment Reporting Information [Line Items]
Net sales		107,458	138,449	227,906	316,078
Segments | International Marketing and Distribution
Segment Reporting Information [Line Items]
Net sales		276,876	465,238	559,913	1,003,044
Segments | Corporate
Segment Reporting Information [Line Items]
Net sales		(2,867)	2,717	(476)	3,549
Segments | Eliminations
Segment Reporting Information [Line Items]
Net sales		(182,689)	(247,621)	(379,759)	(537,296)
Intersegment | Continuing Operations
Segment Reporting Information [Line Items]
Net sales		0	0	0	0
Intersegment | Americas Recycling
Segment Reporting Information [Line Items]
Net sales		28,705	31,580	53,076	77,837
Intersegment | Americas Mills
Segment Reporting Information [Line Items]
Net sales		146,880	181,118	313,771	402,110
Intersegment | Americas Fabrication
Segment Reporting Information [Line Items]
Net sales		2,183	2,731	5,016	6,982
Intersegment | International Mill
Segment Reporting Information [Line Items]
Net sales		0	0	0	0
Intersegment | International Marketing and Distribution
Segment Reporting Information [Line Items]
Net sales		4,921	32,192	7,896	50,367
Intersegment | Corporate
Segment Reporting Information [Line Items]
Net sales		0	0	0	0
Intersegment | Eliminations
Segment Reporting Information [Line Items]
Net sales		$ (182,689)	$ (247,621)	$ (379,759)	$ (537,296)
[1] Excludes total assets from discontinued operations of $16.2 million at February 29, 2016 and $31.5 million at August 31, 2015.

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