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CHANGES IN BUSINESS (Narrative) (Details)
$ in Thousands
9 Months Ended 12 Months Ended
May 31, 2018
USD ($)
Aug. 31, 2019
USD ($)
Aug. 31, 2018
USD ($)
Aug. 31, 2017
USD ($)
Nov. 05, 2018
fabrication_facility
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]          
Number of rebar fabrication facilities | fabrication_facility         33
Inventory write-downs   $ 723 $ 1,407 $ 21,529  
Provision for losses on receivables, net   388 2,510 6,049  
Severance expense related to discontinued operations   900 6,700 17,500  
Structural Steel Fabrication Operations          
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]          
Proceeds from sale of business     20,300    
Nonrecurring impairment charge   $ 13,700      
Australian Steel Trading Business          
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]          
Pre-tax gain (loss) $ (5,300)        
Currency translation gain (loss)     (2,100) (4,200)  
International Marketing and Distribution          
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]          
Inventory write-downs     $ 1,200 20,700  
Provision for losses on receivables, net       $ 5,100