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LEASES (Tables) | 9 Months Ended
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Jun. 30, 2025
Leases [Abstract] |
Schedule of Lease, Cost | The following table presents the Company's lease costs included in the Unaudited Condensed Consolidated Statements of Operations:
|  | Three Months Ended | Nine Months Ended
|  | June 30, | June 30,
(Thousands) | Income Statement Location | 2025 | 2024 | 2025 | 2024
Operating lease cost (1) | Operation and maintenance | $ | 2,830 |  | $ | 2,595 |  | $ | 8,350 |  | $ | 7,659 |
Finance lease cost |  |  |  |  |
Amortization of right-of-use assets | Depreciation and amortization | 382 |  | 540 |  | 1,304 |  | 1,620 |
Interest on lease liabilities | Interest expense, net of capitalized interest | 147 |  | 222 |  | 492 |  | 710 |
Total finance lease cost |  | 529 |  | 762 |  | 1,796 |  | 2,330 |
Variable lease cost | Operation and maintenance | 227 |  | 105 |  | 611 |  | 551 |
Total lease cost |  | $ | 3,586 |  | $ | 3,462 |  | $ | 10,757 |  | $ | 10,540 |
(1)Net of capitalized costs. The following table presents supplemental cash flow information related to leases:
| Nine Months Ended
| June 30,
(Thousands) | 2025 | 2024
Cash paid for amounts included in the measurement of lease liabilities |  |
Operating cash flows for operating leases | $ | 6,666 |  | $ | 5,947 |
Operating cash flows for finance leases | $ | 492 |  | $ | 710 |
Financing cash flows for finance leases | $ | 6,249 |  | $ | 5,820 |
Schedule of Assets and Liabilities, Lessee | The following table presents the balance and classifications of the Company's right of use assets and lease liabilities included in the Unaudited Condensed Consolidated Balance Sheets:
(Thousands) | Balance Sheet Location | June 30, 2025 | September 30, 2024
Assets |  |  |
Noncurrent |  |  |
Operating lease assets | Operating lease assets | $ | 191,851 |  | $ | 184,485 |
Finance lease assets | Utility plant | 24,784 |  | 26,088 |
Total lease assets |  | $ | 216,635 |  | $ | 210,573 |
Liabilities |  |  |
Current |  |  |
Operating lease liabilities | Operating lease liabilities | $ | 6,006 |  | $ | 4,945 |
Finance lease liabilities | Current maturities of long-term debt | 6,278 |  | 7,534 |
Noncurrent |  |  |
Operating lease liabilities | Operating lease liabilities | 168,645 |  | 159,303 |
Finance lease liabilities | Long-term debt | 10,980 |  | 16,026 |
Total lease liabilities |  | $ | 191,909 |  | $ | 187,808 |

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- Definition Assets And Liabilities, Lessee [Table Text Block] + References No definition available. + Details
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- Definition Tabular disclosure of lessee's lease cost. Includes, but is not limited to, interest expense for finance lease, amortization of right-of-use asset for finance lease, operating lease cost, short-term lease cost, variable lease cost and sublease income. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 842 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 4 -Publisher FASB -URI https://asc.fasb.org/1943274/2147478964/842-20-50-4 + Details
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- References No definition available. + Details
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