LEASES - LEASE COST (Details) - USD ($) $ in Thousands	3 Months Ended	6 Months Ended
	Mar. 31, 2020	Mar. 31, 2020
Leases [Abstract]
Amortization of right-of-use assets	$ 1,299	$ 2,460
Interest on lease liabilities	301	548
Total finance lease cost	1,600	3,008
Operating lease cost	1,719	3,111
Short-term lease cost	172	626
Variable lease cost	403	1,110
Total lease cost	$ 3,894	$ 7,855