LEASES - RIGHT-OF-USE ASSETS AND LEASE LIABILITIES (Details) - USD ($) $ in Thousands	Jun. 30, 2020	Sep. 30, 2019
NONCURRENT ASSETS
Operating lease assets	$ 101,657	$ 0
Finance lease assets	72,357
Total lease assets	174,014
Current
Operating lease liabilities	4,458	0
Finance lease liabilities	10,645
Noncurrent
Operating lease liabilities	96,118	$ 0
Finance lease liabilities	66,944
Total lease liabilities	$ 178,165