The aggregate amount of write-downs for impairments recognized during the period for long lived assets held for use (including those held for disposal by means other than sale).

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 45
-Paragraph 28
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=109223946&loc=d3e3602-108585

Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 360
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=109226691&loc=d3e2921-110230

Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 958
-SubTopic 220
-Section 45
-Paragraph 11
-Subparagraph (a)
-URI http://asc.fasb.org/extlink&oid=114873921&loc=SL114875236-224282

Reference 4: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 360
-SubTopic 10
-Section 45
-Paragraph 4
-URI http://asc.fasb.org/extlink&oid=109226348&loc=d3e2420-110228

Name:	us-gaap_ImpairmentOfLongLivedAssetsHeldForUse
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

LONG-LIVED ASSET IMPAIRMENTS Long-lived Asset Impairments (Details) - USD ($) $ in Thousands	3 Months Ended	12 Months Ended
	Aug. 31, 2017	Aug. 31, 2018	Aug. 31, 2017	Aug. 31, 2016
Restructuring Cost and Reserve [Line Items]
Goodwill impairment		$ (515)
Nonrecurring impairment charge		2,100	$ 4,200	$ 15,800
Americas Recycling
Restructuring Cost and Reserve [Line Items]
Goodwill impairment		0
Impairment of long-lived assets	$ 38,900
Structural Steel Fabrication Operations
Restructuring Cost and Reserve [Line Items]
Asset impairment charges		(13,100)
Nonrecurring impairment charge		$ (13,700)