LEASES - Supplemental Cash Flow Information (Details) - USD ($) $ in Thousands	6 Months Ended
	Mar. 31, 2021	Mar. 31, 2020
Cash paid for amounts included in the measurement of lease liabilities:
Operating cash flows from operating leases	$ 22,099	$ 21,582
Financing cash flows from finance leases	1,865	1,940
Total	$ 23,964	$ 23,522