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GOODWILL AND OTHER INTANGIBLES (Changes in the Carrying Amount of Goodwill) (Details) - USD ($)
$ in Thousands
May 31, 2020
Aug. 31, 2019
Goodwill [Line Items]    
Goodwill, gross $ 74,312  
Accumulated impairment losses (10,186)  
Goodwill, net 64,126 $ 64,138
Americas Recycling    
Goodwill [Line Items]    
Goodwill, gross 9,543  
Accumulated impairment losses (9,543)  
Goodwill, net 0  
Americas Mills    
Goodwill [Line Items]    
Goodwill, gross 4,970  
Accumulated impairment losses 0  
Goodwill, net 4,970  
Americas Fabrication    
Goodwill [Line Items]    
Goodwill, gross 57,428  
Accumulated impairment losses (493)  
Goodwill, net 56,935  
International Mill    
Goodwill [Line Items]    
Goodwill, gross 2,371  
Accumulated impairment losses (150)  
Goodwill, net $ 2,221