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Note 6 - Other Comprehensive (Loss) Income and Accumulated Other Comprehensive Loss (Tables)
 12 Months Ended
Aug. 31, 2017
Notes Tables  
Reclassification out of Accumulated Other Comprehensive Income [Table Text Block]
   
Aug
ust 31,
201
7
    
August 31,
201
6
    
August 31,
2015
  
(in thousands)
  
Pre-tax
    
Net of tax
    
Pre-tax
    
Net of tax
    
Pre-tax
    
Net of tax
  
Foreign currency translation adjustments
   $
28,816
     $
28,816
     $
(23,644
 )   $
(23,644
 )   $
(25,263
 )   $
(25,263
 )
Realized loss on cash flow hedges reclassified to earnings
(1)
    
2,883
      
1,813
      
451
      
284
      
559
      
352
  
Unrealized
gain (loss) on cash flow hedges recognized in AOCL
    
5,183
      
3,204
      
(1,806
 )    
(1,141
 )    
(1,939
 )    
(1,220
 )
Other comprehensive (loss) income
   $
36,882
     $
33,833
     $
(24,999
 )   $
(24,501
 )   $
(26,643
 )   $
(26,131
 )
Schedule of Accumulated Other Comprehensive Income (Loss) [Table Text Block]
(in thousands)
  
Aug
ust 31,
201
7
    
August 31,
201
6
  
Accumulated unrealized losses on cash flow hedges, net of tax
   $
3,802
     $
(1,215
 )
Accumulated foreign currency translation adjustments
    
(38,522
 )    
(67,338
 )
Total accumulated other comprehensive loss
   $
(34,720
 )   $
(68,553
 )