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BUSINESS SEGMENTS (Summary of Certain Financial Information from Continuing Operations by Reportable Segment) (Details) - USD ($) $ in Thousands		3 Months Ended		9 Months Ended
		May. 31, 2015	May. 31, 2014	May. 31, 2015	May. 31, 2014	Aug. 31, 2014
Segment Reporting Information [Line Items]
Net sales		$ 1,506,002	$ 1,738,593	$ 4,577,109	$ 4,953,129
Adjusted operating profit (loss)		125,978	58,135	311,491	163,908
Total assets		3,579,726		3,579,726		$ 3,688,520
Continuing Operations
Segment Reporting Information [Line Items]
Net sales		1,506,002	1,738,593	4,577,109	4,953,129
Adjusted operating profit (loss)		125,978	58,135	311,491	163,908
Total assets	[1]	3,501,641		3,501,641		3,681,510
Americas Recycling
Segment Reporting Information [Line Items]
Net sales		194,081	287,533	691,382	874,155
Adjusted operating profit (loss)		(1,970)	(1,085)	(3,285)	(1,109)
Total assets	[1]	266,913		266,913		296,564
Americas Mills
Segment Reporting Information [Line Items]
Net sales		244,632	308,878	796,218	878,013
Adjusted operating profit (loss)		84,237	74,063	258,108	183,939
Total assets	[1]	706,229		706,229		647,437
Americas Fabrication
Segment Reporting Information [Line Items]
Net sales		415,763	406,066	1,165,679	1,082,630
Adjusted operating profit (loss)		22,878	1,244	31,642	(1,869)
Total assets	[1]	730,285		730,285		691,765
International Mill
Segment Reporting Information [Line Items]
Net sales		156,286	207,364	472,364	617,101
Adjusted operating profit (loss)		6,146	2,047	11,188	25,647
Total assets	[1]	414,914		414,914		466,449
International Marketing and Distribution
Segment Reporting Information [Line Items]
Net sales		494,639	528,559	1,447,316	1,489,686
Adjusted operating profit (loss)		37,669	2,023	71,599	8,552
Total assets	[1]	953,750		953,750		949,016
Corporate
Segment Reporting Information [Line Items]
Net sales		601	193	4,150	11,544
Adjusted operating profit (loss)		(19,502)	(18,227)	(55,513)	(51,340)
Total assets	[1]	1,001,085		1,001,085		1,100,995
Eliminations
Segment Reporting Information [Line Items]
Net sales		0	0	0	0
Adjusted operating profit (loss)		(3,480)	(1,930)	(2,248)	88
Total assets	[1]	(571,535)		(571,535)		$ (470,716)
Segments | Continuing Operations
Segment Reporting Information [Line Items]
Net sales		1,506,002	1,738,593	4,577,109	4,953,129
Segments | Americas Recycling
Segment Reporting Information [Line Items]
Net sales		225,096	335,104	800,234	1,015,574
Segments | Americas Mills
Segment Reporting Information [Line Items]
Net sales		446,821	527,574	1,400,517	1,465,574
Segments | Americas Fabrication
Segment Reporting Information [Line Items]
Net sales		417,895	409,425	1,174,793	1,093,533
Segments | International Mill
Segment Reporting Information [Line Items]
Net sales		156,318	207,558	472,396	618,070
Segments | International Marketing and Distribution
Segment Reporting Information [Line Items]
Net sales		518,244	549,745	1,521,288	1,533,551
Segments | Corporate
Segment Reporting Information [Line Items]
Net sales		601	193	4,150	11,544
Segments | Eliminations
Segment Reporting Information [Line Items]
Net sales		(258,973)	(291,006)	(796,269)	(784,717)
Intersegment | Continuing Operations
Segment Reporting Information [Line Items]
Net sales		0	0	0	0
Intersegment | Americas Recycling
Segment Reporting Information [Line Items]
Net sales		31,015	47,571	108,852	141,419
Intersegment | Americas Mills
Segment Reporting Information [Line Items]
Net sales		202,189	218,696	604,299	587,561
Intersegment | Americas Fabrication
Segment Reporting Information [Line Items]
Net sales		2,132	3,359	9,114	10,903
Intersegment | International Mill
Segment Reporting Information [Line Items]
Net sales		32	194	32	969
Intersegment | International Marketing and Distribution
Segment Reporting Information [Line Items]
Net sales		23,605	21,186	73,972	43,865
Intersegment | Corporate
Segment Reporting Information [Line Items]
Net sales		0	0	0	0
Intersegment | Eliminations
Segment Reporting Information [Line Items]
Net sales		$ (258,973)	$ (291,006)	$ (796,269)	$ (784,717)
[1] Excludes total assets from discontinued operations of $78.1 million at May 31, 2015 and $7.0 million at August 31, 2014.

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