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LEASES - Right-of-use lease assets and lease liabilities (Details) - USD ($) $ in Thousands | Mar. 31, 2023 | Sep. 30, 2022
--- | --- | ---
Right-of-use lease assets and lease liabilities |  |
Operating ROU assets, net | $ 42,014 | $ 32,489
Current portion of operating lease liabilities | 10,061 | 7,982
Long-term operating lease liabilities | 32,730 | 24,854
Total operating lease liabilities | 42,791 | 32,836
Finance ROU assets, net | $ 65 | $ 79
Finance Lease, Right-of-Use Asset, Statement of Financial Position [Extensible Enumeration] | Other Assets, Noncurrent | Other Assets, Noncurrent
Current portion of long-term finance lease | $ 39 | $ 43
Finance Lease, Liability, Current, Statement of Financial Position [Extensible Enumeration] | Accrued Liabilities, Current | Accrued Liabilities, Current
Long-term finance lease liabilities | $ 34 | $ 41
Finance Lease, Liability, Noncurrent, Statement of Financial Position [Extensible Enumeration] | Other Liabilities, Noncurrent | Other Liabilities, Noncurrent
Total finance lease liabilities | $ 73 | $ 84

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