LEASES - Reconciliation of future undiscounted cash flows to the operating and finance lease liabilities, and the related ROU assets (Details) - USD ($) $ in Thousands	Jun. 30, 2023	Sep. 30, 2022
Operating leases
2023 (excluding the nine months ended June 30, 2023)	$ 1,796
2024	6,458
2025	5,168
2026	4,300
2027 and thereafter	36,913
Total minimum lease payments	54,635
Less: amounts representing interest	12,570
Present value of net minimum lease payments	42,065
Less: current portion of lease obligations	5,250
Non-current portion of lease obligations	36,815	$ 24,853
ROU assets	$ 40,314	$ 29,150
Location of operating lease liabilities included on Consolidated Balance Sheets	Accrued other expenses, Other liabilities
Location of operating lease ROU assets included on Consolidated Balance Sheets	ROU assets
Finance leases
2023 (excluding the nine months ended June 30, 2023)	$ 566
2024	2,315
2025	2,370
2026	2,434
2027 and thereafter	18,997
Total minimum lease payments	26,682
Less: amounts representing interest	6,491
Present value of net minimum lease payments	20,191
Less: current portion of lease obligations	1,415
Non-current portion of lease obligations	18,776
ROU assets	$ 16,164
Location of finance lease liabilities included on Consolidated Balance Sheets	Accrued other expenses, Other liabilities
Location of finance lease ROU assets included on Consolidated Balance Sheets	Property, Plant and Equipment, Net