REVENUE RECOGNITION - Revenue Recognition Method (Details) - Americas Fabrication	3 Months Ended	6 Months Ended
	Feb. 28, 2019	Feb. 28, 2019
Recognized as Amounts are Billed
Disaggregation of Revenue [Line Items]
Contract as percent of total segment revenue (percent)	44.00%	45.00%
Fabricated Product and Installation Services | Recognized over Time
Disaggregation of Revenue [Line Items]
Contract as percent of total segment revenue (percent)	29.00%	29.00%
Fabricated Product without Installation Services | Recognized over Time
Disaggregation of Revenue [Line Items]
Contract as percent of total segment revenue (percent)	27.00%	26.00%