GOODWILL AND OTHER INTANGIBLE ASSETS (Changes in the Carrying Amount of Goodwill) (Details) - USD ($) $ in Thousands	3 Months Ended
	Nov. 30, 2015	Aug. 31, 2015
Goodwill [Line Items]
Goodwill	$ 76,623	$ 76,787
Accumulated impairment losses	(10,393)	(10,404)
Goodwill [Roll Forward]
Balance at August 31, 2015	66,383
Foreign currency translation	(153)
Balance at November 30, 2015	66,230
Americas Recycling
Goodwill [Line Items]
Goodwill	9,751	9,751
Accumulated impairment losses	(9,751)	(9,751)
Goodwill [Roll Forward]
Balance at August 31, 2015	0
Foreign currency translation	0
Balance at November 30, 2015	0
Americas Mills
Goodwill [Line Items]
Goodwill	4,970	4,970
Accumulated impairment losses	0	0
Goodwill [Roll Forward]
Balance at August 31, 2015	4,970
Foreign currency translation	0
Balance at November 30, 2015	4,970
Americas Fabrication
Goodwill [Line Items]
Goodwill	57,637	57,637
Accumulated impairment losses	(493)	(493)
Goodwill [Roll Forward]
Balance at August 31, 2015	57,144
Foreign currency translation	0
Balance at November 30, 2015	57,144
International Mill
Goodwill [Line Items]
Goodwill	2,351	2,517
Accumulated impairment losses	(149)	(160)
Goodwill [Roll Forward]
Balance at August 31, 2015	2,357
Foreign currency translation	(155)
Balance at November 30, 2015	2,202
International Marketing and Distribution
Goodwill [Line Items]
Goodwill	1,914	1,912
Accumulated impairment losses	0	$ 0
Goodwill [Roll Forward]
Balance at August 31, 2015	1,912
Foreign currency translation	2
Balance at November 30, 2015	$ 1,914