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Note 6 - Other Comprehensive (Loss) Income and Accumulated Other Comprehensive Loss (Tables)
 12 Months Ended
Aug. 31, 2018
Notes Tables  
Reclassification out of Accumulated Other Comprehensive Income [Table Text Block]
   
August 31,
2018
    
August 31,
2017
    
August 31,
2016
  
(in thousands)
  
Pre-tax
    
Net of tax
    
Pre-tax
    
Net of tax
    
Pre-tax
    
Net of tax
  
Foreign currency translation adjustments
   $
(9,431
 )   $
(9,431
 )   $
28,816
     $
28,816
     $
(23,644
 )   $
(23,644
 )
Realized (gain) loss on cash flow hedges reclassified to earnings
(1)
    
(3,106
 )    
(2,128
 )    
2,883
      
1,813
      
451
      
284
  
Unrealized (loss) gain on cash flow hedges recognized in AOCL
    
(7,700
 )    
(5,160
 )    
5,183
      
3,204
      
(1,806
 )    
(1,141
 )
Other comprehensive
income
(loss)
   $
(20,237
 )   $
(16,719
 )   $
36,882
     $
33,833
     $
(24,999
 )   $
(24,501
 )
Schedule of Accumulated Other Comprehensive Income (Loss) [Table Text Block]
(in thousands)
  
August 31,
2018
    
August 31,
2017
  
Accumulated unrealized (gain) losses on cash flow hedges, net of tax
   $
(3,486
 )   $
3,802
  
Accumulated foreign currency translation adjustments
    
(47,953
 )    
(38,522
 )
Total accumulated other comprehensive loss
   $
(51,439
 )   $
(34,720
 )