LEASES - Summary of Future Maturities of Lease Payments for Operating Leases (Details) - USD ($) $ in Thousands	Dec. 31, 2020	Sep. 30, 2020
Operating Leases
2021	$ 28,990
2021	34,154
2022	25,804
2023	18,956
2024	17,138
2025	11,739
Thereafter	63,844
Total lease payments	200,625
Less: Imputed Interest	(36,687)
Present value of lease liabilities	163,938	$ 167,902
Finance Leases
2021	3,317
2021	2,732
2022	2,395
2023	2,122
2024	2,074
2025	2,074
Thereafter	7,777
Total lease payments	22,491
Less: Imputed Interest	(4,460)
Present value of lease liabilities	$ 18,031	$ 18,691