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SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES (Tables) | 9 Months Ended
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Jun. 30, 2025
Accounting Policies [Abstract] |
Schedule of Restricted Cash | The following table provides a reconciliation of cash and cash equivalents and restricted cash reported in the Unaudited Condensed Consolidated Balance Sheets to the total amounts in the Unaudited Condensed Consolidated Statements of Cash Flows as follows:
(Thousands) | June 30, 2025 | September 30, 2024 | June 30, 2024 |
Balance Sheet |  |  |  |
Cash and cash equivalents | $ | 931 |  | $ | 1,017 |  | $ | 22,399 |  |
Restricted cash in other noncurrent assets | $ | 1,058 |  | $ | 595 |  | $ | 735 |  |
Statements of Cash Flow |  |  |  |
Cash, cash equivalents and restricted cash | $ | 1,989 |  | $ | 1,612 |  | $ | 23,134 |  |
Schedule of Natural Gas in Storage | The following table summarizes natural gas in storage, at average cost by segment as of:
| June 30, 2025 | September 30, 2024
($ in thousands) | Natural Gas in Storage | Bcf | Natural Gas in Storage | Bcf
NJNG |  | $ | 131,098 |  | 22.7 |  |  | $ | 177,655 |  | 30.8 |
ES |  | 36,530 |  | 13.7 |  |  | 21,378 |  | 13.1 |
S&T |  | 528 |  | 0.2 |  |  | 92 |  | — |
Total |  | $ | 168,157 |  | 36.6 |  |  | $ | 199,125 |  | 43.9 |
Schedule of Software Costs Included in the Consolidated Financial Statements | The following tables present the software costs included in the Unaudited Condensed Consolidated Financial Statements:
(Thousands) | June 30, 2025 | September 30, 2024
Balance Sheets |  |
Utility plant, at cost | $ | 133,498 |  | $ | 133,158 |
Construction work in progress | $ | 64,854 |  | $ | 26,659 |
Nonutility plant and equipment, at cost | $ | 344 |  | $ | 344 |
Accumulated depreciation and amortization, utility plant | $ | (22,357) |  | $ | (13,632) |
Accumulated depreciation and amortization, nonutility plant and equipment | $ | (56) |  | $ | (48) |
Software costs | $ | 10,784 |  | $ | 10,522 |
| Three Months Ended | Nine Months Ended
| June 30, | June 30,
Statements of Operations | 2025 | 2024 | 2025 | 2024
Operation and maintenance | $ | 1,335 |  | $ | 4,048 |  | $ | 5,221 |  | $ | 9,975 |
Depreciation and amortization | $ | 3,190 |  | $ | 1,507 |  | $ | 8,733 |  | $ | 3,761 |
Schedule of Accumulated Other Comprehensive (Loss) Income | The following table presents the changes in the components of accumulated other comprehensive (loss) income, net of related tax effects during the three months ended June 30, 2025 and 2024:
(Thousands) | Cash Flow Hedges | Postemployment Benefit Obligation | Total
Balance as of March 31, 2025 | $ | (5,689) |  |  | $ | (697) |  |  | $ | (6,386) |
Other comprehensive income (loss), net of tax |  |  |  |  |
Amounts reclassified from accumulated other comprehensive loss, net of tax of $(79), $58, $(21), respectively | 264 |  |  | (196) |  | (1) | 68 |
Balance as of June 30, 2025 | $ | (5,425) |  |  | $ | (893) |  |  | $ | (6,318) |
Balance as of March 31, 2024 | $ | (6,743) |  |  | $ | 7,065 |  |  | $ | 322 |
Other comprehensive income, net of tax |  |  |  |  |
Amounts reclassified from accumulated other comprehensive loss, net of tax of $(79), $112 and $33, respectively | 264 |  |  | (369) |  | (1) | (105) |
Balance as of June 30, 2024 | $ | (6,479) |  |  | $ | 6,696 |  |  | $ | 217 |
(1)Included in the computation of net periodic pension cost, a component of O&M on the Unaudited Condensed Consolidated Statements of Operations. The following table presents the changes in the components of accumulated other comprehensive (loss) income, net of related tax effects during the nine months ended June 30, 2025 and 2024:
(Thousands) | Cash Flow Hedges | Postemployment Benefit Obligation | Total
Balance as of September 30, 2024 | $ | (6,215) |  |  | $ | (306) |  |  | $ | (6,521) |
Other comprehensive income (loss), net of tax |  |  |  |  |
Amounts reclassified from accumulated other comprehensive loss, net of tax of $(238), $174 and $(64), respectively | 790 |  |  | (587) |  | (1) | 203 |
Balance as of June 30, 2025 | $ | (5,425) |  |  | $ | (893) |  |  | $ | (6,318) |
Balance as of September 30, 2023 | $ | (7,269) |  |  | $ | (2,690) |  |  | $ | (9,959) |
Other comprehensive income, net of tax |  |  |  |  |
Other comprehensive income, before reclassifications, net of tax of $0, $(3,020) and $(3,020), respectively | — |  |  | 9,992 |  |  | 9,992 |
Amounts reclassified from accumulated other comprehensive loss, net of tax of $(238), $184 and $(54), respectively | 790 |  |  | (606) |  | (1) | 184 |
Net current-period other comprehensive income, net of tax of $(238), $(2,836) and $(3,074), respectively | 790 |  |  | 9,386 |  |  | 10,176 |
Balance as of June 30, 2024 | $ | (6,479) |  |  | $ | 6,696 |  |  | $ | 217 |
(1)Included in the computation of net periodic pension cost, a component of O&M on the Unaudited Condensed Consolidated Statements of Operations.

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