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REVENUE RECOGNITION - Revenue Recognition Method (Details) - Americas Fabrication - Recognized over Time
12 Months Ended
Aug. 31, 2021
Aug. 31, 2020
Aug. 31, 2019
Fabricated Product and Installation Services      
Disaggregation of Revenue [Line Items]      
Contract as percent of total segment revenue (percent) 10.00% 12.00% 12.00%
Fabricated Product without Installation Services      
Disaggregation of Revenue [Line Items]      
Contract as percent of total segment revenue (percent) 9.00% 11.00% 9.00%