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Note 9 - Goodwill (Tables)
 6 Months Ended
Feb. 28, 2018
Notes Tables  
Schedule of Goodwill [Table Text Block]
(i
n
thousands
)
  
U.S.
    
Europe
    
Asia Pacific
    
Total
  
Balance at August 31, 2017
   $
386,835
     $
317,759
     $
2,966
     $
707,560
  
Foreign currency translations
    
—
      
11,460
      
93
      
11,553
  
Other adjustments
    
(640
 )    
(1,561
 )    
—
      
(2,201
 )
Balance at February 28, 2018
   $
386,195
     $
327,658
     $
3,059
     $
716,912