OTHER LONG-TERM ASSETS (Details) - USD ($) $ in Thousands	Sep. 30, 2020	Sep. 30, 2019
Other long-term assets [Abstract]
Long-term right of use assets	$ 30,999	$ 0
Long-term vendor contract assets	2,889	1,164
Long-term SERP investments	1,214	980
Prepaid unamortized debt issuance costs - revolver	537	709
Other long-term assets	4,368	2,858
Total	$ 40,007	$ 5,711