LEASES - Additional information related to leases (Details) - USD ($) $ in Thousands	3 Months Ended
	Dec. 31, 2020	Dec. 31, 2019
Cash paid for amounts included in the measurement of lease liabilities
Operating cash flows from operating leases	$ 1,425	$ 1,408
Operating cash flows from finance leases	313	138
Financing cash flows from finance leases	417	351
Right-of-use assets obtained in exchange for lease liabilities
Operating leases	$ 0	$ 22,014
Weighted-average remaining lease term
Operating leases	5 years 10 months 24 days	6 years 6 months
Finance leases	12 years 3 months 18 days	13 years 2 months 12 days
Weighted-average discount rate
Operating leases	3.10%	3.14%
Finance leases	4.30%	4.28%