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CHANGES IN BUSINESS - Additional Information (Details)
t in Millions, $ in Millions
3 Months Ended 9 Months Ended 12 Months Ended
Dec. 29, 2017
USD ($)
fabrication_facility
t
May 31, 2018
USD ($)
May 31, 2018
USD ($)
Aug. 31, 2017
USD ($)
Business Acquisition [Line Items]        
Annual melt capacity | t 7.2      
U.S. Rebar Steel Mill and Fabrication Assets        
Business Acquisition [Line Items]        
Cash purchase price of acquisition $ 600.0      
Number of rebar fabrication facilities acquired | fabrication_facility 33      
Annual melt capacity | t 2.7      
Structural Steel Fabrication Operations        
Business Acquisition [Line Items]        
Non-recurring impairment charge   $ 0.9 $ 13.0  
Australian Steel Trading Business        
Business Acquisition [Line Items]        
Loss on disposal of certain assets and liabilities     $ 5.3  
Impairment charges related to accumulated foreign currency translation       $ 4.2