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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, 2019	Aug. 31, 2018	Aug. 31, 2017
Goodwill [Line Items]
Goodwill, beginning	$ 74,509	$ 77,310
Dispositions, impairments and foreign currency translation		(819)
Foreign currency translation	(184)
Reclassification to assets of discontinued operations		(1,982)
Goodwill, ending	74,325	74,509
Accumulated impairment loss, beginning	(10,199)	(12,395)
Dispositions, impairments and foreign currency translation	12	214
Accumulated impairment loss, ending	(10,187)	(10,199)
Goodwill, net	64,138	64,310	$ 64,915
Dispositions, impairments and foreign currency translation	(172)	(605)
Goodwill impairment		1,982
Goodwill, net	64,138	64,310
Americas Recycling
Goodwill [Line Items]
Goodwill, beginning	9,543	9,751
Dispositions, impairments and foreign currency translation		(208)
Foreign currency translation	0
Reclassification to assets of discontinued operations		0
Goodwill, ending	9,543	9,543
Accumulated impairment loss, beginning	(9,543)	(9,751)
Dispositions, impairments and foreign currency translation	0	208
Accumulated impairment loss, ending	(9,543)	(9,543)
Goodwill, net	0	0	0
Dispositions, impairments and foreign currency translation	0	0
Goodwill impairment		0
Goodwill, net	0	0
Americas Mills
Goodwill [Line Items]
Goodwill, beginning	4,970	4,970
Dispositions, impairments and foreign currency translation		0
Foreign currency translation	0
Reclassification to assets of discontinued operations		0
Goodwill, ending	4,970	4,970
Accumulated impairment loss, beginning	0	0
Dispositions, impairments and foreign currency translation	0	0
Accumulated impairment loss, ending	0	0
Goodwill, net	4,970	4,970	4,970
Dispositions, impairments and foreign currency translation	0	0
Goodwill impairment		0
Goodwill, net	4,970	4,970
Americas Fabrication
Goodwill [Line Items]
Goodwill, beginning	57,428	57,943
Dispositions, impairments and foreign currency translation		(515)
Foreign currency translation	0
Reclassification to assets of discontinued operations		0
Goodwill, ending	57,428	57,428
Accumulated impairment loss, beginning	(493)	(493)
Dispositions, impairments and foreign currency translation	0	0
Accumulated impairment loss, ending	(493)	(493)
Goodwill, net	56,935	56,935	57,450
Dispositions, impairments and foreign currency translation	0	(515)
Goodwill impairment		0
Goodwill, net	56,935	56,935
International Mill
Goodwill [Line Items]
Goodwill, beginning	2,568	2,664
Dispositions, impairments and foreign currency translation		(96)
Foreign currency translation	(184)
Reclassification to assets of discontinued operations		0
Goodwill, ending	2,384	2,568
Accumulated impairment loss, beginning	(163)	(169)
Dispositions, impairments and foreign currency translation	12	6
Accumulated impairment loss, ending	(151)	(163)
Goodwill, net	2,233	2,405	2,495
Dispositions, impairments and foreign currency translation	(172)	(90)
Goodwill impairment		0
Goodwill, net	2,233	2,405
International Marketing and Distribution
Goodwill [Line Items]
Goodwill, beginning	0	1,982
Dispositions, impairments and foreign currency translation		0
Foreign currency translation	0
Reclassification to assets of discontinued operations		(1,982)
Goodwill, ending	0	0
Accumulated impairment loss, beginning	0	(1,982)
Dispositions, impairments and foreign currency translation	0	0
Accumulated impairment loss, ending	0	0
Goodwill, net	0	0	$ 0
Dispositions, impairments and foreign currency translation	0	0
Goodwill impairment		1,982
Goodwill, net	$ 0	$ 0

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