LEASES - Additional information related to leases (Details) $ in Thousands	3 Months Ended	9 Months Ended
	Jun. 30, 2020 USD ($)	Jun. 30, 2020 USD ($)
Cash paid for amounts included in the measurement of lease liabilities
Operating cash flows from operating leases	$ 1,452	$ 4,334
Operating cash flows from finance leases	319	655
Financing cash flows from finance leases	418	1,145
Right-of-use assets obtained in exchange for lease liabilities
Operating leases	$ 53	$ 22,072
Weighted-average remaining lease term
Operating leases	6 years 7 months 20 days	6 years 7 months 20 days
Finance leases	12 years 9 months 3 days	12 years 9 months 3 days
Weighted-average discount rate
Operating leases	3.14%	3.14%
Finance leases	4.29%	4.29%