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Other Assets Schedule of Goodwill (Details) - USD ($)
$ in Thousands
12 Months Ended
Aug. 31, 2015
Aug. 31, 2014
Aug. 31, 2013
Goodwill [Line Items]      
Goodwill $ 150,115 $ 158,696 $ 85,063
Goodwill, Acquired During Period, Net of Purchase Accounting Adjustments (3,283)    
Goodwill, Acquired During Period 423 72,913  
Goodwill, Translation Adjustments (5,298) 720  
Energy [Member]      
Goodwill [Line Items]      
Goodwill 552 552 552
Goodwill, Acquired During Period, Net of Purchase Accounting Adjustments 0    
Goodwill, Acquired During Period   0  
Goodwill, Translation Adjustments 0 0  
Ag [Member]      
Goodwill [Line Items]      
Goodwill 142,665 151,246 77,613
Goodwill, Acquired During Period, Net of Purchase Accounting Adjustments (3,283)    
Goodwill, Acquired During Period   72,913  
Goodwill, Translation Adjustments (5,298) 720  
Corporate and Other [Member]      
Goodwill [Line Items]      
Goodwill 6,898 6,898 $ 6,898
Goodwill, Acquired During Period, Net of Purchase Accounting Adjustments 0    
Goodwill, Acquired During Period   0  
Goodwill, Translation Adjustments $ 0 $ 0