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GOODWILL AND OTHER INTANGIBLE ASSETS (Changes in the Carrying Amount of Goodwill) (Details)
$ in Thousands
 3 Months Ended
Nov. 30, 2017
USD ($)
Goodwill [Roll Forward]  
Balance at August 31, 2017 $ 77,310
Foreign currency translation 27
Balance at November 30, 2017 77,337
Foreign currency translation (12,395)
Foreign currency translation (2)
Accumulated impairment losses (12,397)
Balance at August 31, 2017 64,915
Foreign currency translation 25
Balance at November 30, 2017 64,940
Americas Recycling  
Goodwill [Roll Forward]  
Balance at August 31, 2017 9,751
Foreign currency translation 0
Balance at November 30, 2017 9,751
Foreign currency translation (9,751)
Foreign currency translation 0
Accumulated impairment losses (9,751)
Balance at August 31, 2017 0
Foreign currency translation 0
Balance at November 30, 2017 0
Americas Mills  
Goodwill [Roll Forward]  
Balance at August 31, 2017 4,970
Foreign currency translation 0
Balance at November 30, 2017 4,970
Foreign currency translation 0
Foreign currency translation 0
Accumulated impairment losses 0
Balance at August 31, 2017 4,970
Foreign currency translation 0
Balance at November 30, 2017 4,970
Americas Fabrication  
Goodwill [Roll Forward]  
Balance at August 31, 2017 57,943
Foreign currency translation 0
Balance at November 30, 2017 57,943
Foreign currency translation (493)
Foreign currency translation 0
Accumulated impairment losses (493)
Balance at August 31, 2017 57,450
Foreign currency translation 0
Balance at November 30, 2017 57,450
International Mill  
Goodwill [Roll Forward]  
Balance at August 31, 2017 2,664
Foreign currency translation 27
Balance at November 30, 2017 2,691
Foreign currency translation (169)
Foreign currency translation (2)
Accumulated impairment losses (171)
Balance at August 31, 2017 2,495
Foreign currency translation 25
Balance at November 30, 2017 2,520
International Marketing and Distribution  
Goodwill [Roll Forward]  
Balance at August 31, 2017 1,982
Foreign currency translation 0
Balance at November 30, 2017 1,982
Foreign currency translation (1,982)
Foreign currency translation 0
Accumulated impairment losses (1,982)
Balance at August 31, 2017 0
Foreign currency translation 0
Balance at November 30, 2017 $ 0