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Note 10 - Goodwill (Tables)
 12 Months Ended
Aug. 31, 2018
Notes Tables  
Schedule of Goodwill [Table Text Block]
(in thousands)
  
U.S.
    
Europe
    
Asia Pacific
    
Total
  
Balance at August 31, 2016
   $
367,480
     $
82,280
     $
3,155
     $
452,915
  
Acquisitions and other adjustments
    
19,355
      
216,047
      
—
      
235,402
  
Foreign currency translations
    
—
      
19,432
      
(189
 )    
19,243
  
Balance at August 31, 2017
   $
386,835
     $
317,759
     $
2,966
     $
707,560
  
Acquisitions and other adjustments
    
(640
 )    
(1,562
 )    
—
      
(2,202
 )
Foreign currency translations
    
—
      
(3,503
 )    
(22
 )    
(3,525
 )
Balance at August 31, 2018
   $
386,195
     $
312,694
     $
2,944
     $
701,833