REVENUE RECOGNITION - Revenue Recognition Method (Details) - Americas Fabrication	3 Months Ended	9 Months Ended
	May 31, 2019	May 31, 2019
Recognized as Amounts are Billed
Disaggregation of Revenue [Line Items]
Contract as percent of total segment revenue (percent)	54.00%	51.00%
Fabricated Product and Installation Services | Recognized over Time
Disaggregation of Revenue [Line Items]
Contract as percent of total segment revenue (percent)	27.00%	27.00%
Fabricated Product without Installation Services | Recognized over Time
Disaggregation of Revenue [Line Items]
Contract as percent of total segment revenue (percent)	19.00%	22.00%