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LEASES - RIGHT-OF-USE ASSETS AND LEASE LIABILITIES (Details) - USD ($) $ in Thousands | Mar. 31, 2024 | Sep. 30, 2023
--- | --- | ---
Noncurrent |  |
Operating lease assets | $ 177,176 | $ 175,740
Finance Lease, Right-of-Use Asset, Statement of Financial Position [Extensible Enumeration] | Utility plant, at cost | Utility plant, at cost
Finance lease assets | $ 27,168 | $ 28,248
Total lease assets | 204,344 | 203,988
Current |  |
Operating lease liabilities | $ 4,780 | $ 4,772
Finance Lease, Liability, Current, Statement of Financial Position [Extensible Enumeration] | Current maturities of long-term debt | Current maturities of long-term debt
Finance lease liabilities | $ 8,816 | $ 8,477
Noncurrent |  |
Operating lease liabilities | $ 150,971 | $ 148,023
Finance Lease, Liability, Noncurrent, Statement of Financial Position [Extensible Enumeration] | Long-term debt | Long-term debt
Finance lease liabilities | $ 18,661 | $ 22,875
Total lease liabilities | $ 183,228 | $ 184,147

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- Definition Present value of lessee's discounted obligation for lease payments from finance lease, classified as current. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 842 -SubTopic 20 -Name Accounting Standards Codification -Section 45 -Paragraph 1 -Subparagraph (b) -Publisher FASB -URI https://asc.fasb.org//1943274/2147479041/842-20-45-1 + Details
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- Definition Present value of lessee's discounted obligation for lease payments from finance lease, classified as noncurrent. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 842 -SubTopic 20 -Name Accounting Standards Codification -Section 45 -Paragraph 1 -Subparagraph (b) -Publisher FASB -URI https://asc.fasb.org//1943274/2147479041/842-20-45-1 + Details
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- Definition Amount, after accumulated amortization, of right-of-use asset from finance lease. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 842 -SubTopic 20 -Name Accounting Standards Codification -Section 45 -Paragraph 1 -Subparagraph (a) -Publisher FASB -URI https://asc.fasb.org//1943274/2147479041/842-20-45-1 + Details
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