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OTHER LONG-TERM ASSETS (Tables)
 6 Months Ended
Mar. 31, 2020
Deferred Costs, Capitalized, Prepaid, and Other Assets Disclosure [Abstract]  
Other long-term assets
Other long-term assets consisted of the following:
March 31, 2020September 30, 2019
Long-term right of use asset$29,715  $—  
Long-term contract assets3,776  1,164  
Long-term SERP investment1,036  980  
Prepaid unamortized debt issuance cost - revolver623  709  
Other long-term assets2,574  2,858  
Total$37,724  $5,711