LEASES - Supplemental Cash Flow Information (Details) - USD ($) $ in Thousands	9 Months Ended
	Jun. 30, 2021	Jun. 30, 2020
Leases [Abstract]
Payments on operating lease obligations	$ 12,072	$ 18,820
Payments for interest on finance lease obligations	174	853
Payments on finance lease obligations	808	1,034
Total	$ 13,054	$ 20,707