GOODWILL AND OTHER INTANGIBLE ASSETS (Changes in the Carrying Amount of Goodwill) (Details) $ in Thousands	9 Months Ended
	May. 31, 2015 USD ($)
Goodwill [Roll Forward]
Balance at August 31, 2014	$ 74,319
Foreign currency translation	(557)
Balance at May 31, 2015	73,762
Americas Recycling
Goodwill [Roll Forward]
Balance at August 31, 2014	7,267
Foreign currency translation	0
Balance at May 31, 2015	7,267
Americas Mills
Goodwill [Roll Forward]
Balance at August 31, 2014	4,970
Foreign currency translation	0
Balance at May 31, 2015	4,970
Americas Fabrication
Goodwill [Roll Forward]
Balance at August 31, 2014	57,144
Foreign currency translation	0
Balance at May 31, 2015	57,144
International Mill
Goodwill [Roll Forward]
Balance at August 31, 2014	2,776
Foreign currency translation	(398)
Balance at May 31, 2015	2,378
International Marketing and Distribution
Goodwill [Roll Forward]
Balance at August 31, 2014	2,162
Foreign currency translation	(159)
Balance at May 31, 2015	$ 2,003