LEASES - Supplemental cash flow information (Details) - USD ($) $ in Thousands	12 Months Ended
	Sep. 30, 2021	Sep. 30, 2020
Cash paid for amounts included in the measurement of lease liabilities:
Operating cash flows from operating leases	$ 43,444	$ 48,141
Financing cash flows from finance leases	3,815	4,122
Total	$ 47,259	$ 52,263