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Note 9 - Goodwill (Tables)
 9 Months Ended
May 31, 2019
Notes Tables  
Schedule of Goodwill [Table Text Block]
(in
thousands)
  
U.S.
    
Europe
    
Asia Pacific
    
Total
  
Balance at August 31, 2018
   $
386,195
     $
312,694
     $
2,944
     $
701,833
  
Foreign currency translations
    
—
      
(10,940
)
    
63
      
(10,877
)
Balance at May 31, 2019
   $
386,195
     $
301,754
     $
3,007
     $
690,956