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Regulatory Matters - Regulatory Proceedings (Details) - USD ($) $ in Thousands |  |  |  |  |  |  | 1 Months Ended | 3 Months Ended
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Dec. 07, 2023 | Sep. 21, 2023 | Aug. 01, 2023 | Jun. 22, 2023 | Apr. 27, 2023 | Feb. 03, 2023 | Aug. 24, 2023 | Feb. 28, 2021 | Sep. 30, 2023
Apple Valley Water System |  |  |  |  |  |  |  |  |
Regulatory Liabilities [Line Items] |  |  |  |  |  |  |  |  |
Approved revenue increase |  |  |  |  |  | $ 1,494 |  |  |
Park Water System |  |  |  |  |  |  |  |  |
Regulatory Liabilities [Line Items] |  |  |  |  |  |  |  |  |
Approved revenue increase |  |  |  |  |  | $ 1,105 |  |  |
CalPeco Electric System |  |  |  |  |  |  |  |  |
Regulatory Liabilities [Line Items] |  |  |  |  |  |  |  |  |
Approved revenue increase |  |  |  |  | $ 26,979 |  |  |  |
St. Lawrence Gas |  |  |  |  |  |  |  |  |
Regulatory Liabilities [Line Items] |  |  |  |  |  |  |  |  |
Approved revenue increase |  |  |  | $ 5,249 |  |  |  |  |
Pine Bluff Water |  |  |  |  |  |  |  |  |
Regulatory Liabilities [Line Items] |  |  |  |  |  |  |  |  |
Approved revenue increase |  |  |  |  |  |  | $ 3,400 |  |
Gas New Brunswick |  |  |  |  |  |  |  |  |
Regulatory Liabilities [Line Items] |  |  |  |  |  |  |  |  |
Approved revenue increase |  | $ 700 |  |  |  |  |  |  |
Empire Electric |  |  |  |  |  |  |  |  |
Regulatory Liabilities [Line Items] |  |  |  |  |  |  |  |  |
Approved revenue increase | $ 5,300 |  |  |  |  |  |  |  |
Securitization of qualified extraordinary costs affirmed |  |  | $ 290,383 |  |  |  |  |  |
Public utilities, incurred cost one-time net gain (loss) |  |  |  |  |  |  |  | $ 63,495 | $ 48,452

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