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Segment Information - Segment Operating Income Reconciliation to Consolidated (Details) - USD ($)
$ in Thousands
3 Months Ended
Nov. 30, 2018
Nov. 30, 2017
Segment Reporting Information [Line Items]    
Operating income $ 22,689 $ 26,423
Restructuring charges and other exit-related activities (202) (100)
Interest expense (1,906) (2,059)
Other income, net 23 849
Income from continuing operations before income taxes 20,806 25,213
Operating Segments    
Segment Reporting Information [Line Items]    
Operating income 34,935 43,648
Operating Segments | Auto and Metals Recycling    
Segment Reporting Information [Line Items]    
Operating income 23,017 35,172
Operating Segments | Cascade Steel and Scrap    
Segment Reporting Information [Line Items]    
Operating income 11,918 8,476
Segment Reconciling Items    
Segment Reporting Information [Line Items]    
Restructuring charges and other exit-related activities (202) (100)
Corporate and eliminations    
Segment Reporting Information [Line Items]    
Operating income $ (12,044) $ (17,125)