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REVENUE RECOGNITION - Revenue Recognition Method (Details) - Americas Fabrication
3 Months Ended
Nov. 30, 2019
Recognized as Amounts are Billed  
Disaggregation of Revenue [Line Items]  
Contract as percent of total segment revenue (percent) 51.00%
Fabricated Product and Installation Services | Recognized over Time  
Disaggregation of Revenue [Line Items]  
Contract as percent of total segment revenue (percent) 26.00%
Fabricated Product without Installation Services | Recognized over Time  
Disaggregation of Revenue [Line Items]  
Contract as percent of total segment revenue (percent) 23.00%