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Summary of Significant Accounting Policies: (Details) customer in Thousands | 3 Months Ended | 6 Months Ended | 9 Months Ended |
--- | --- | --- | --- | ---
Jun. 30, 2018 USD ($) | Jun. 30, 2017 USD ($) | Jun. 30, 2018 USD ($) customer registrant | Jun. 30, 2017 USD ($) | Sep. 30, 2017 | Dec. 31, 2017 USD ($)
Basis of Presentation: |  |  |  |  |  |
Number of registrants filing combined report | registrant |  |  | 2 |  |  |
Related Party Transactions |  |  |  |  |  |
Notes payable to bank | $ 77,000,000 |  | $ 77,000,000 |  |  | $ 0
AWR | Syndicated Credit Facility |  |  |  |  |  |
Related Party Transactions |  |  |  |  |  |
Maximum borrowing capacity on line of credit | 150,000,000 |  | 150,000,000 |  |  |
GOLDEN STATE WATER COMPANY |  |  |  |  |  |
Related Party Transactions |  |  |  |  |  |
Payments to affiliate for corporate office administrative and general costs | 1,000,000 | $ 1,000,000 | 2,000,000 | $ 2,000,000 |  |
GOLDEN STATE WATER COMPANY | Notes Payable 6.7 Percent Due 2019 [Member] |  |  |  |  |  |
Related Party Transactions |  |  |  |  |  |
Debt and Capital Lease Obligations | $ 40,000,000 |  | $ 40,000,000 |  |  |
Debt Instrument, Interest Rate, Stated Percentage | 6.70% |  | 6.70% |  |  |
GOLDEN STATE WATER COMPANY | Water Service Utility Operations |  |  |  |  |  |
Nature of Operations: |  |  |  |  |  |
Number of customers | customer |  |  | 260 |  |  |
GOLDEN STATE WATER COMPANY | Electric Service Utility Operations [Member] |  |  |  |  |  |
Nature of Operations: |  |  |  |  |  |
Number of customers | customer |  |  | 24 |  |  |
American States Utility Services [Member] | Contracted Services [Member] |  |  |  |  |  |
Nature of Operations: |  |  |  |  |  |
Period of fixed price contracts to operate and maintain the water and/or wastewater systems at various military bases |  |  | 50 years |  |  |
Fort Riley [Member] | Contracted Services [Member] |  |  |  |  |  |
Nature of Operations: |  |  |  |  |  |
Period of fixed price contracts to operate and maintain the water and/or wastewater systems at various military bases |  |  |  |  | 50 years |

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