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Goodwill and Other Intangible Assets Goodwill by Segment (Details) - USD ($)
$ in Thousands
9 Months Ended
May 31, 2019
Mar. 01, 2019
Aug. 31, 2018
Goodwill [Roll Forward]      
Goodwill $ 199,822   $ 138,464
Goodwill, Acquired During Period 61,358    
remainingownershipacquired   75.00%  
Energy      
Goodwill [Roll Forward]      
Goodwill 552   552
Ag      
Goodwill [Roll Forward]      
Goodwill 188,696   127,338
Goodwill, Acquired During Period 61,358    
Corporate and Other      
Goodwill [Roll Forward]      
Goodwill $ 10,574   $ 10,574