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Accumulated Other Comprehensive Loss (Tables)
 12 Months Ended
Aug. 31, 2020
Accumulated Other Comprehensive Loss [Abstract]  
Changes in accumulated other comprehensive loss
Changes in accumulated other comprehensive loss are as follows:

  
Foreign
currency
translation
adjustment
  
Cash-flow
hedge
  
Accumulated
other
comprehensive
loss
 
          
Balance as at September 1, 2017
 
$
(40,874
)
 
$
1,909
  
$
(38,965
)
Foreign currency translation adjustment
  
(6,491
)
  
–
   
(6,491
)
Changes in unrealized gains/losses on forward exchange contracts, net of deferred income taxes
  
–
   
(1,894
)
  
(1,894
)
             
Balance as at August 31, 2018
  
(47,365
)
  
15
   
(47,350
)
Foreign currency translation adjustment
  
(4,177
)
  
–
   
(4,177
)
Changes in unrealized gains/losses on forward exchange contracts, net of deferred income taxes
  
–
   
16
   
16
 
             
Balance as at August 31, 2019
  
(51,542
)
  
31
   
(51,511
)
             
Foreign currency translation adjustment
  
5,994
   
–
   
5,994
 
Changes in unrealized gains/losses on forward exchange contracts, net of deferred income taxes
  
–
   
1,743
   
1,743
 
             
Balance as at August 31, 2020
 
$
(45,548
)
 
$
1,774
  
$
(43,774
)