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OTHER LONG-TERM ASSETS (Tables)
 9 Months Ended
Jun. 30, 2018
OTHER LONG-TERM ASSETS [Abstract]  
Other Long Term Assets
Other long-term assets consisted of the following:

  
June 30,
2018
  
September 30,
2017
 
       
Auction rate securities (ARS)
 
$
3,975
  
$
5,319
 
Long-term contract assets
  
1,809
   
2,115
 
Other long-term assets
  
2,026
   
2,154
 
Other long-term investments
  
1,089
   
929
 
Total
 
$
8,899
  
$
10,517