LEASES - Additional information related to leases (Details) $ in Thousands	3 Months Ended	6 Months Ended
	Mar. 31, 2020 USD ($)	Mar. 31, 2020 USD ($)
Cash paid for amounts included in the measurement of lease liabilities
Operating cash flows from operating leases	$ 1,380	$ 2,717
Operating cash flows from finance leases	198	335
Financing cash flows from finance leases	376	727
Right-of-use assets obtained in exchange for lease liabilities
Operating leases	$ 1,566	$ 22,268
Weighted-average remaining lease term
Operating leases	6 years 4 months 13 days	6 years 4 months 13 days
Finance leases	12 years 11 months 19 days	12 years 11 months 19 days
Weighted-average discount rate
Operating leases	3.14%	3.14%
Finance leases	4.29%	4.29%