GOODWILL AND OTHER INTANGIBLE ASSETS (Narrative) (Details) - USD ($)	12 Months Ended
	Aug. 31, 2015	Aug. 31, 2014	Aug. 31, 2013
Goodwill impairment charges	$ 7,267,000	$ 0	$ 6,400,000
Accumulated goodwill impairment charges	10,404,000	9,808,000	9,495,000
Goodwill	66,383,000	74,319,000	69,579,000
Amortization expense for intangible assets	$ 6,900,000	5,100,000	4,900,000
Favorable land leases
Weighted average remaining useful lives	50 years
Intangible assets excluding favorable land leases
Weighted average remaining useful lives	8 years
Australia
Foreign currency translation gain related to goodwill impairment		600,000
One reporting unit within Americas Fabrication
Goodwill	$ 51,300,000	$ 51,300,000	$ 51,300,000