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Regulatory Matters - Narrative (Details) |  |  |  | 3 Months Ended | 9 Months Ended | 12 Months Ended |  |
--- | --- | --- | --- | --- | --- | --- | --- | ---
Jul. 31, 2023 | Jun. 30, 2023 | Jun. 29, 2023 | Mar. 31, 2023 USD ($) | Sep. 30, 2023 USD ($) | Dec. 31, 2024 | Sep. 30, 2023 USD ($) | Sep. 30, 2022 | Apr. 10, 2023 USD ($) | Dec. 31, 2022 USD ($)
Regulatory matters: |  |  |  |  |  |  |  |  |  |
Regulatory asset not accruing carrying costs |  |  |  |  | $ 67,100,000 |  | $ 67,100,000 |  |  |
Net regulatory Assets |  |  |  |  | 77,667,000 |  | 77,667,000 |  |  | $ (25,454,000)
Regulatory asset amount billed to customers as surcharges |  |  |  |  | $ 0 |  |  |  |  |
Cost of capital proceeding |  |  |  |  |  |  |  |  |  |
Regulatory matters: |  |  |  |  |  |  |  |  |  |
Adjustment to return on equity, if more than 100 basis point change |  |  |  |  | 0.5 |  |  |  |  |
Threshold percentage of Moody's average bond rate used adjusting return on equity and rate of return on rate base, increase (decrease) |  |  |  |  | 0.0100 |  |  |  |  |
GSWC |  |  |  |  |  |  |  |  |  |
Regulatory matters: |  |  |  |  |  |  |  |  |  |
Net regulatory Assets |  |  |  |  | $ 60,866,000 |  | 60,866,000 |  |  | (26,574,000)
Approved equity capital structure (in percent) |  |  | 57.00% |  |  |  |  |  |  |
Approved debt capital structure (in percent) |  |  | 43.00% |  |  |  |  |  |  |
Approved debt capital structure, percentage previously authorized |  |  |  |  | 6.60% |  |  |  |  |
Approved return on equity previously authorized (in percent) |  |  |  |  | 8.90% |  |  |  |  |
Regulatory asset-CEMA |  |  |  |  | $ 3,500,000 |  | $ 3,500,000 |  |  |
GSWC | Cost of capital proceeding |  |  |  |  |  |  |  |  |  |
Regulatory matters: |  |  |  |  |  |  |  |  |  |
Approved debt capital structure in May 2021 cost of capital application (in percent) |  |  |  |  | 5.10% |  |  |  |  |
Approved return on equity in May 2021 cost of capital application (in percent) |  | 8.85% |  |  |  |  |  |  |  |
Term for the cost of capital proceeding |  |  |  |  | 3 years |  |  |  |  |
Revenue impact due to lower cost of debt |  |  |  |  | $ 6,400,000 |  |  |  |  |
Triggers for the WCMA adjustment, impact of 103 Basis Point increase in Moody's Rate (in percent) |  |  |  |  |  |  | 0.01397 | 0.01028 |  |
Requested return on equity (in percent) | 9.36% |  |  |  |  |  |  |  |  |
GSWC | Cost of capital proceeding | Subsequent Event |  |  |  |  |  |  |  |  |  |
Regulatory matters: |  |  |  |  |  |  |  |  |  |
Approved return on equity in May 2021 cost of capital application (in percent) |  |  |  |  |  | 9.36% |  |  |  |
Requested return on equity (in percent) |  |  |  |  |  | 10.06% |  |  |  |
BVES |  |  |  |  |  |  |  |  |  |
Regulatory matters: |  |  |  |  |  |  |  |  |  |
Regulatory asset-CEMA |  |  |  |  | 500,000 |  | $ 500,000 |  | $ 0 |
Regulatory Asset -incremental vegetation management costs |  |  |  |  | 10,900,000 |  | 10,900,000 |  |  |
Regulatory asset- wildfire mitigation plans (WMP) |  |  |  |  | 5,500,000 |  | 5,500,000 |  |  |
Regulatory asset CEMA - Storm |  |  |  |  | 1,300,000 |  | 1,300,000 |  |  |
2022/2023 general rate case memorandum accounts (unbilled revenue) | GSWC |  |  |  |  |  |  |  |  |  |
Regulatory matters: |  |  |  |  |  |  |  |  |  |
Net regulatory Assets |  |  |  |  | $ 55,140,000 |  | $ 55,140,000 |  |  | 0
Amortization period |  |  |  |  | 36 months |  | 36 months |  |  |
Water revenue adjustment mechanism, net of modified cost balancing account |  |  |  |  |  |  |  |  |  |
Regulatory matters: |  |  |  |  |  |  |  |  |  |
Increase (decrease) in other regulatory assets |  |  |  | $ (9,800,000) | $ 34,900,000 |  |  |  |  |
Regulatory asset recovery periods |  |  |  |  | 24 months |  |  |  |  |
Water revenue adjustment mechanism, net of modified cost balancing account | GSWC |  |  |  |  |  |  |  |  |  |
Regulatory matters: |  |  |  |  |  |  |  |  |  |
Net regulatory Assets |  |  |  |  | $ 46,597,000 |  | $ 46,597,000 |  |  | 31,803,000
Commercial paper, term |  |  |  |  | 90 days |  |  |  |  |
Excess deferred income taxes |  |  |  |  |  |  |  |  |  |
Regulatory matters: |  |  |  |  |  |  |  |  |  |
Regulatory asset not accruing carrying costs |  |  |  |  | $ 74,400,000 |  | 74,400,000 |  |  |
Excess deferred income taxes | GSWC |  |  |  |  |  |  |  |  |  |
Regulatory matters: |  |  |  |  |  |  |  |  |  |
Net regulatory Assets |  |  |  |  | (70,515,000) |  | (70,515,000) |  |  | (71,870,000)
Derivative instrument memorandum account (Note 5) |  |  |  |  |  |  |  |  |  |
Regulatory matters: |  |  |  |  |  |  |  |  |  |
Regulatory asset not accruing carrying costs |  |  |  |  | 1,500,000 |  | 1,500,000 |  |  |
Derivative instrument memorandum account (Note 5) | BVES |  |  |  |  |  |  |  |  |  |
Regulatory matters: |  |  |  |  |  |  |  |  |  |
Net regulatory Assets |  |  |  |  | (1,525,000) |  | (1,525,000) |  |  | $ (11,847,000)
Pension Costs and Other Postretirement Benefit Costs [Member] |  |  |  |  |  |  |  |  |  |
Regulatory matters: |  |  |  |  |  |  |  |  |  |
Regulatory asset not accruing carrying costs |  |  |  |  | 2,600,000 |  | 2,600,000 |  |  |
Modified Cost Balancing account ("MCBA") | GSWC |  |  |  |  |  |  |  |  |  |
Regulatory matters: |  |  |  |  |  |  |  |  |  |
Net regulatory Assets |  |  |  |  | (4,600,000) |  | (4,600,000) |  |  |
Water Revenue Adjustment Mechanism ("WRAM") | GSWC |  |  |  |  |  |  |  |  |  |
Regulatory matters: |  |  |  |  |  |  |  |  |  |
Net regulatory Assets |  |  |  |  | $ 51,200,000 |  | $ 51,200,000 |  |  |

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