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LEASES - RIGHT-OF-USE ASSETS AND LEASE LIABILITIES (Details) - USD ($) $ in Thousands	Jun. 30, 2025	Sep. 30, 2024
Noncurrent
Operating lease assets	$ 191,851	$ 184,485
Finance Lease, Right-of-Use Asset, Statement of Financial Position [Extensible Enumeration]	Utility plant, at cost	Utility plant, at cost
Finance lease assets	$ 24,784	$ 26,088
Total lease assets	216,635	210,573
Current
Operating lease liabilities	$ 6,006	$ 4,945
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	$ 6,278	$ 7,534
Noncurrent
Operating lease liabilities	$ 168,645	$ 159,303
Finance Lease, Liability, Noncurrent, Statement of Financial Position [Extensible Enumeration]	Long-term debt	Long-term debt
Finance lease liabilities	$ 10,980	$ 16,026
Total lease liabilities	$ 191,909	$ 187,808

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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
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