OTHER LONG-TERM ASSETS (Details) - USD ($) $ in Thousands	Mar. 31, 2020	Sep. 30, 2019
Other long-term assets [Abstract]
Long-term right of use asset	$ 29,715
Long-term contract assets	3,776	$ 1,164
Long-term SERP investment	1,036	980
Prepaid unamortized debt issuance cost - revolver	623	709
Other long-term assets	2,574	2,858
Total	$ 37,724	$ 5,711