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Interest and other expense, net
 12 Months Ended
Sep. 30, 2019
Other Income and Expenses [Abstract]  
Interest and other expense, net
Note 15 — Interest and other expense, net
Interest and other expense, net, consists of the following:
 
Year Ended September 30,
 
  
2019
 
  
2018
 
  
2017
 
Interest income
  $
6,225
    $
6,602
    $
7,972
 
Interest expense
   
(3,911
 )    
(2,764
 )    
(1,600
 )
Foreign exchange loss
   
(7,860
 )    
(6,173
 )    
(8,246
 )
Other, net
   
3,687
     
(4,431
 )    
(2,547
 )
                         
   $
(1,859
 )   $
(6,766
 )   $
(4,421
 )