REVENUE RECOGNITION - Revenue Recognition Method (Details) - Americas Fabrication	3 Months Ended
	Nov. 30, 2020	Nov. 30, 2019
Recognized as Amounts are Billed
Disaggregation of Revenue [Line Items]
Contract as percent of total segment revenue (percent)	(77.00%)	77.00%
Fabricated Product and Installation Services | Recognized over Time
Disaggregation of Revenue [Line Items]
Contract as percent of total segment revenue (percent)	14.00%	12.00%
Fabricated Product without Installation Services | Recognized over Time
Disaggregation of Revenue [Line Items]
Contract as percent of total segment revenue (percent)	9.00%	11.00%