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Note 9 - Goodwill (Tables)
 6 Months Ended
Feb. 28, 2019
Notes Tables  
Schedule of Goodwill [Table Text Block]
(i
n
thousands
)
  
U.S.
    
Europe
    
Asia Pacific
    
Total
  
Balance at August 31, 2018
   $
386,195
     $
312,694
     $
2,944
     $
701,833
  
Foreign currency translations
    
—
      
(1,793
 )    
(11
 )    
(1,804
 )
Balance at February 28, 2019
   $
386,195
     $
310,901
     $
2,933
     $
700,029