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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. 28, 2017	Feb. 29, 2016	Feb. 28, 2017	Feb. 29, 2016	Aug. 31, 2016
Segment Reporting Information [Line Items]
Net sales		$ 1,149,621	$ 1,019,697
Adjusted operating profit (loss) from continuing operations		52,271	29,968	$ 75,623	$ 86,029
Total assets		3,131,833		3,131,833		$ 3,130,869
Continuing Operations
Segment Reporting Information [Line Items]
Net sales		1,149,621	1,019,697	2,224,684	2,174,556
Adjusted operating profit (loss) from continuing operations		52,271	29,968	75,623	86,029
Total assets	[1]	3,130,874		3,130,874		3,124,082
Americas Recycling
Segment Reporting Information [Line Items]
Net sales		188,502	119,641	342,864	274,477
Adjusted operating profit (loss) from continuing operations		7,766	(7,645)	2,668	(14,193)
Total assets	[1]	214,630		214,630		188,873
Americas Mills
Segment Reporting Information [Line Items]
Net sales		220,607	189,549	423,938	407,190
Adjusted operating profit (loss) from continuing operations		51,319	50,699	88,268	109,763
Total assets	[1]	865,428		865,428		798,481
Americas Fabrication
Segment Reporting Information [Line Items]
Net sales		301,382	333,961	636,659	713,442
Adjusted operating profit (loss) from continuing operations		506	14,825	7,217	36,170
Total assets	[1]	657,917		657,917		659,165
International Mill
Segment Reporting Information [Line Items]
Net sales		134,125	107,458	268,315	227,906
Adjusted operating profit (loss) from continuing operations		9,430	1,951	19,403	4,722
Total assets	[1]	389,184		389,184		372,492
International Marketing and Distribution
Segment Reporting Information [Line Items]
Net sales		301,163	271,955	547,316	552,017
Adjusted operating profit (loss) from continuing operations		6,143	(2,293)	5,177	(4,462)
Total assets	[1]	591,769		591,769		564,068
Corporate
Segment Reporting Information [Line Items]
Net sales		3,842	(2,867)	5,592	(476)
Adjusted operating profit (loss) from continuing operations		(22,317)	(28,801)	(46,330)	(46,873)
Total assets	[1]	935,452		935,452		1,034,053
Eliminations
Segment Reporting Information [Line Items]
Net sales		0	0	0	0
Adjusted operating profit (loss) from continuing operations		(576)	1,232	(780)	902
Total assets	[1]	(523,506)		(523,506)		(493,050)
Segments | Continuing Operations
Segment Reporting Information [Line Items]
Net sales		1,149,621	1,019,697	2,224,684	2,174,556
Segments | Americas Recycling
Segment Reporting Information [Line Items]
Net sales		223,328	148,346	400,036	327,553
Segments | Americas Mills
Segment Reporting Information [Line Items]
Net sales		376,593	336,429	723,758	720,961
Segments | Americas Fabrication
Segment Reporting Information [Line Items]
Net sales		303,826	336,144	642,226	718,458
Segments | International Mill
Segment Reporting Information [Line Items]
Net sales		134,305	107,458	268,706	227,906
Segments | International Marketing and Distribution
Segment Reporting Information [Line Items]
Net sales		302,295	276,876	550,455	559,913
Segments | Corporate
Segment Reporting Information [Line Items]
Net sales		3,842	(2,867)	5,592	(476)
Segments | Eliminations
Segment Reporting Information [Line Items]
Net sales		(194,568)	(182,689)	(366,089)	(379,759)
Intersegment | Continuing Operations
Segment Reporting Information [Line Items]
Net sales		0	0	0	0
Intersegment | Americas Recycling
Segment Reporting Information [Line Items]
Net sales		34,826	28,705	57,172	53,076
Intersegment | Americas Mills
Segment Reporting Information [Line Items]
Net sales		155,986	146,880	299,820	313,771
Intersegment | Americas Fabrication
Segment Reporting Information [Line Items]
Net sales		2,444	2,183	5,567	5,016
Intersegment | International Mill
Segment Reporting Information [Line Items]
Net sales		180	0	391	0
Intersegment | International Marketing and Distribution
Segment Reporting Information [Line Items]
Net sales		1,132	4,921	3,139	7,896
Intersegment | Corporate
Segment Reporting Information [Line Items]
Net sales		0	0	0	0
Intersegment | Eliminations
Segment Reporting Information [Line Items]
Net sales		(194,568)	$ (182,689)	(366,089)	$ (379,759)
Discontinued operations
Segment Reporting Information [Line Items]
Disposal Group, Including Discontinued Operation, Assets		$ 1,000		$ 1,000		$ 6,800
[1] Excludes total assets from discontinued operations of $1.0 million at February 28, 2017 and $6.8 million at August 31, 2016.

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