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CHANGES IN BUSINESS (Narrative) (Details)
$ in Thousands, t in Millions
 9 Months Ended 12 Months Ended
Dec. 29, 2017
USD ($)
fabrication_facility
t
May 31, 2018
USD ($)
Aug. 31, 2018
USD ($)
Aug. 31, 2017
USD ($)
Aug. 31, 2016
USD ($)
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]          
Annual melt capacity | t 7.2        
Nonrecurring impairment charge     $ 2,100 $ 4,200 $ 15,800
Inventory write-downs     1,407 21,529 15,555
Provision for losses on receivables, net     2,510 6,049 6,878
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) (15,800)
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 8,000
Provision for losses on receivables, net       $ 5,100  
Stock compensation expense         $ 4,400
U.S. Rebar Steel Mill and Fabrication Assets [Member]          
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]          
Cash paid for acquisition $ 600,000        
Number of rebar fabrication facilities | fabrication_facility 33        
Annual melt capacity | t 2.7