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Utility Regulatory Assets and Liabilities and Regulatory Matters - Narrative (Details) - USD ($) $ in Thousands |  |  |  |  |  |  |  |  |  | 6 Months Ended | 12 Months Ended |
--- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | ---
Mar. 06, 2023 | Jan. 27, 2023 | Nov. 16, 2022 | Nov. 01, 2022 | Sep. 15, 2022 | Jul. 29, 2022 | Jan. 28, 2022 | Nov. 09, 2021 | Feb. 08, 2021 | Mar. 31, 2023 | Mar. 31, 2022 | Sep. 30, 2022 | Dec. 01, 2022
Regulatory Assets |  |  |  |  |  |  |  |  |  |  |  |  |
Net unrealized gains |  |  |  |  |  |  |  |  |  | $ (1,713,000) | $ 341,000 |  |
Pilot program duration |  |  |  | 5 years |  |  |  |  |  |  |  |  |
WVPSC |  |  |  |  |  |  |  |  |  |  |  |  |
Regulatory Assets |  |  |  |  |  |  |  |  |  |  |  |  |
Under-recovery of gas cost |  |  |  |  |  |  |  |  |  |  |  |  | $ 12,000
Gas Utility |  |  |  |  |  |  |  |  |  |  |  |  |
Regulatory Assets |  |  |  |  |  |  |  |  |  |  |  |  |
Net unrealized gains |  |  |  |  |  |  |  |  |  | $ (17,000) | $ 21,000 | $ 5,000 |
Gas Utility | PAPUC |  |  |  |  |  |  |  |  |  |  |  |  |
Regulatory Assets |  |  |  |  |  |  |  |  |  |  |  |  |
Requested rate increase (decrease) |  |  |  |  |  |  | $ 83,000 |  |  |  |  |  |
Gas Utility | PAPUC | Joint Petition |  |  |  |  |  |  |  |  |  |  |  |  |
Regulatory Assets |  |  |  |  |  |  |  |  |  |  |  |  |
Requested rate increase (decrease) |  |  |  |  | $ 49,000 |  |  |  |  |  |  |  |
Approved rate |  |  |  | 3.00% |  |  |  |  |  |  |  |  |
Property, plant and equipment, net threshold |  |  |  | $ 3,368 |  |  |  |  |  |  |  |  |
Gas Utility | PAPUC | Beginning October 29, 2022 |  |  |  |  |  |  |  |  |  |  |  |  |
Regulatory Assets |  |  |  |  |  |  |  |  |  |  |  |  |
Requested rate increase (decrease) |  |  |  |  | 38,000 |  |  |  |  |  |  |  |
Gas Utility | PAPUC | Beginning October 1, 2023 |  |  |  |  |  |  |  |  |  |  |  |  |
Regulatory Assets |  |  |  |  |  |  |  |  |  |  |  |  |
Requested rate increase (decrease) |  |  |  |  | $ 11,000 |  |  |  |  |  |  |  |
Gas Utility | PAPUC | Weather Normalization Adjustment Rider |  |  |  |  |  |  |  |  |  |  |  |  |
Regulatory Assets |  |  |  |  |  |  |  |  |  |  |  |  |
Rate period |  |  |  | 5 years |  |  |  |  |  |  |  |  |
Approved rate |  |  |  | 3.00% |  |  |  |  |  |  |  |  |
Utilities | PAPUC |  |  |  |  |  |  |  |  |  |  |  |  |
Regulatory Assets |  |  |  |  |  |  |  |  |  |  |  |  |
Requested rate increase (decrease) |  | $ 11,000 |  |  |  |  |  |  | $ 9,000 |  |  |  |
Approved rate increase |  |  |  |  |  |  |  | $ 6,000 |  |  |  |  |
Mountaineer | WVPSC | Net Revenue Increase |  |  |  |  |  |  |  |  |  |  |  |  |
Regulatory Assets |  |  |  |  |  |  |  |  |  |  |  |  |
Requested rate increase (decrease) | $ 20,000 |  |  |  |  |  |  |  |  |  |  |  |
Mountaineer | WVPSC | Base Rate Case, Base Rate |  |  |  |  |  |  |  |  |  |  |  |  |
Regulatory Assets |  |  |  |  |  |  |  |  |  |  |  |  |
Requested rate increase (decrease) | 38,000 |  |  |  |  |  |  |  |  |  |  |  |
Mountaineer | WVPSC | Base Rate Case, Infrastructure Rider |  |  |  |  |  |  |  |  |  |  |  |  |
Regulatory Assets |  |  |  |  |  |  |  |  |  |  |  |  |
Requested rate increase (decrease) | $ (18,000) |  |  |  |  |  |  |  |  |  |  |  |
Mountaineer | WVPSC | Over 2023 - 2027 |  |  |  |  |  |  |  |  |  |  |  |  |
Regulatory Assets |  |  |  |  |  |  |  |  |  |  |  |  |
Requested rate increase (decrease) |  |  |  |  |  | $ 354,000 |  |  |  |  |  |  |
Mountaineer | WVPSC | Calendar Year 2023 |  |  |  |  |  |  |  |  |  |  |  |  |
Regulatory Assets |  |  |  |  |  |  |  |  |  |  |  |  |
Requested rate increase (decrease) |  |  |  |  |  | $ 64,000 |  |  |  |  |  |  |
Mountaineer | WVPSC | 2023 IREP |  |  |  |  |  |  |  |  |  |  |  |  |
Regulatory Assets |  |  |  |  |  |  |  |  |  |  |  |  |
Requested rate increase (decrease) |  |  | $ 22,000 |  |  |  |  |  |  |  |  |  |
Mountaineer | WVPSC | 2021 IREP |  |  |  |  |  |  |  |  |  |  |  |  |
Regulatory Assets |  |  |  |  |  |  |  |  |  |  |  |  |
Requested rate increase (decrease) |  |  | $ 1,000 |  |  |  |  |  |  |  |  |  |

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