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Regulatory Matters - Regulatory Proceedings (Details) - USD ($) $ in Thousands | May 30, 2024 | Oct. 17, 2023 | Jul. 12, 2023 | Feb. 14, 2023 | Mar. 18, 2022 | Sep. 30, 2021
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General Rate Case ("GRC") | BELCO |  |  |  |  |  |
Regulatory Liabilities [Line Items] |  |  |  |  |  |
Approved revenue increase |  |  |  |  | $ 22,800 |
Rate of return (percent) |  |  |  |  | 7.16% |
Equity interest (percent) |  |  |  |  | 62.00% |
Return on equity (percent) |  |  |  |  | 8.92% |
General Rate Case ("GRC") | BELCO | Revenue Allowance Application, 2022 |  |  |  |  |  |
Regulatory Liabilities [Line Items] |  |  |  |  |  |
Requested increase |  |  |  |  |  | $ 34,800
Revenue allowance |  |  |  |  | $ 224,100 |
General Rate Case ("GRC") | BELCO | Revenue Allowance Application, 2023 |  |  |  |  |  |
Regulatory Liabilities [Line Items] |  |  |  |  |  |
Requested increase |  |  |  |  |  | $ 6,100
Revenue allowance |  |  |  |  | $ 226,200 |
GRC | BELCO |  |  |  |  |  |
Regulatory Liabilities [Line Items] |  |  |  |  |  |
Requested increase |  | $ 59,100 |  |  |  |
Requested weighted average cost of capital (percent) |  | 10.13% |  |  |  |
GRC | BELCO | Revenue Allowance Application, 2024 |  |  |  |  |  |
Regulatory Liabilities [Line Items] |  |  |  |  |  |
Approved revenue increase | $ 33,600 |  |  |  |  |
GRC | BELCO | Revenue Allowance Application, 2025 |  |  |  |  |  |
Regulatory Liabilities [Line Items] |  |  |  |  |  |
Approved weighted average cost of capital (percent) | 7.79% |  |  |  |  |
Empire Electric |  |  |  |  |  |
Regulatory Liabilities [Line Items] |  |  |  |  |  |
Approved revenue increase |  |  | $ 5,300 |  |  |
Equity interest (percent) |  |  |  | 56.00% |  |
Return on equity (percent) |  |  |  | 10.25% |  |
Securitization of qualified extraordinary costs affirmed |  |  |  | $ 7,300 |  |

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