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GOODWILL AND OTHER INTANGIBLE ASSETS (Changes in the Carrying Amount of Goodwill) (Details) - USD ($) $ in Thousands	12 Months Ended
	Aug. 31, 2018	Aug. 31, 2017	Aug. 31, 2016
Goodwill [Line Items]
Goodwill, beginning	$ 77,310	$ 76,772
Acquisitions		306
Foreign currency translation	(96)	232
Dispositions	(208)
Impairments	(515)
Reclassification to assets of discontinued operations	(1,982)
Goodwill, ending	74,509	77,310
Accumulated impairment loss, beginning	(12,395)	(10,399)
Dispositions	208
Foreign currency translation	6	(14)
Reclassification to assets of discontinued operations	1,982
Accumulated impairment loss, ending	(10,199)	(12,395)
Goodwill, net	64,310	64,915	$ 66,373
Acquisitions		306
Foreign currency translation	(90)	218
Impairment	(515)	(1,982)
Goodwill, net	64,310	64,915
Americas Recycling
Goodwill [Line Items]
Goodwill, beginning	9,751	9,751
Acquisitions		0
Foreign currency translation	0	0
Dispositions	(208)
Impairments	0
Reclassification to assets of discontinued operations	0
Goodwill, ending	9,543	9,751
Accumulated impairment loss, beginning	(9,751)	(9,751)
Dispositions	208
Foreign currency translation	0	0
Reclassification to assets of discontinued operations	0
Accumulated impairment loss, ending	(9,543)	(9,751)
Goodwill, net	0	0	0
Acquisitions		0
Foreign currency translation	0	0
Impairment	0	0
Goodwill, net	0	0
Americas Mills
Goodwill [Line Items]
Goodwill, beginning	4,970	4,970
Acquisitions		0
Foreign currency translation	0	0
Dispositions	0
Impairments	0
Reclassification to assets of discontinued operations	0
Goodwill, ending	4,970	4,970
Accumulated impairment loss, beginning	0	0
Dispositions	0
Foreign currency translation	0	0
Reclassification to assets of discontinued operations	0
Accumulated impairment loss, ending	0	0
Goodwill, net	4,970	4,970	4,970
Acquisitions		0
Foreign currency translation	0	0
Impairment	0	0
Goodwill, net	4,970	4,970
Americas Fabrication
Goodwill [Line Items]
Goodwill, beginning	57,943	57,637
Acquisitions		306
Foreign currency translation	0	0
Dispositions	0
Impairments	(515)
Reclassification to assets of discontinued operations	0
Goodwill, ending	57,428	57,943
Accumulated impairment loss, beginning	(493)	(493)
Dispositions	0
Foreign currency translation	0	0
Reclassification to assets of discontinued operations	0
Accumulated impairment loss, ending	(493)	(493)
Goodwill, net	56,935	57,450	57,144
Acquisitions		306
Foreign currency translation	0	0
Impairment	(515)	0
Goodwill, net	56,935	57,450
International Mill
Goodwill [Line Items]
Goodwill, beginning	2,664	2,432
Acquisitions		0
Foreign currency translation	(96)	232
Dispositions	0
Impairments	0
Reclassification to assets of discontinued operations	0
Goodwill, ending	2,568	2,664
Accumulated impairment loss, beginning	(169)	(155)
Dispositions	0
Foreign currency translation	6	(14)
Reclassification to assets of discontinued operations	0
Accumulated impairment loss, ending	(163)	(169)
Goodwill, net	2,405	2,495	2,277
Acquisitions		0
Foreign currency translation	(90)	218
Impairment	0	0
Goodwill, net	2,405	2,495
International Marketing and Distribution
Goodwill [Line Items]
Goodwill, beginning	1,982	1,982
Acquisitions		0
Foreign currency translation	0	0
Dispositions	0
Impairments	0
Reclassification to assets of discontinued operations	(1,982)
Goodwill, ending	0	1,982
Accumulated impairment loss, beginning	(1,982)	0
Dispositions	0
Foreign currency translation	0	0
Reclassification to assets of discontinued operations	1,982
Accumulated impairment loss, ending	0	(1,982)
Goodwill, net	0	0	$ 1,982
Acquisitions		0
Foreign currency translation	0	0
Impairment	0	(1,982)
Goodwill, net	$ 0	$ 0

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