OTHER LONG-TERM ASSETS (Details) - USD ($) $ in Thousands	Jun. 30, 2020	Sep. 30, 2019
Other long-term assets [Abstract]
Long-term right of use asset	$ 31,241	$ 0
Long-term vendor contract assets	3,346	1,164
Long-term SERP investment	1,147	980
Prepaid unamortized debt issuance cost - revolver	580	709
Other long-term assets	3,182	2,858
Total	$ 39,496	$ 5,711