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Summary of Significant Accounting Policies: (Details) customer in Thousands | 3 Months Ended | 9 Months Ended |  |
--- | --- | --- | --- | ---
Mar. 31, 2018 USD ($) customer registrant | Mar. 31, 2017 USD ($) | Sep. 30, 2017 | Dec. 31, 2017 USD ($) | Oct. 31, 2015 USD ($)
Basis of Presentation: |  |  |  |  |
Number of registrants filing combined report | registrant | 2 |  |  |  |
Related Party Transactions |  |  |  |  |
Notes payable to bank | $ 69,000,000 |  |  | $ 59,000,000 |
Sales and Use Taxes: |  |  |  |  |
Non-income tax assessments accounted on a gross basis | 4,799,000 | $ 4,566,000 |  |  |
AWR | Promissory Note | Notes Receivable |  |  |  |  |
Sales and Use Taxes: |  |  |  |  |
Notes receivable | 0 | 0 |  |  |
AWR | Syndicated Credit Facility |  |  |  |  |
Related Party Transactions |  |  |  |  |
Maximum borrowing capacity on line of credit | 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 |  |  |
Sales and Use Taxes: |  |  |  |  |
Cost of reimbursable expense | 853,000 | 827,000 |  |  |
Non-income tax assessments accounted on a gross basis | 4,386,000 | $ 4,190,000 |  |  |
GOLDEN STATE WATER COMPANY | Promissory Note |  |  |  |  |
Related Party Transactions |  |  |  |  |
Debt instrument, face amount |  |  |  |  | $ 40,000,000
Debt instrument, maximum borrowing capacity |  |  |  |  | 40,000,000
GOLDEN STATE WATER COMPANY | Notes Payable 6.7 Percent Due 2019 [Member] |  |  |  |  |
Sales and Use Taxes: |  |  |  |  |
Debt and Capital Lease Obligations | $ 40,000,000 |  |  |  |
Debt Instrument, Interest Rate, Stated Percentage | 6.70% |  |  |  |
GOLDEN STATE WATER COMPANY | Water Service Utility Operations |  |  |  |  |
Nature of Operations: |  |  |  |  |
Number of customers | customer | 259 |  |  |  |
GOLDEN STATE WATER COMPANY | Electric Service Utility Operations |  |  |  |  |
Nature of Operations: |  |  |  |  |
Number of customers | customer | 24 |  |  |  |
ASUS | Promissory Note |  |  |  |  |
Related Party Transactions |  |  |  |  |
Debt instrument, face amount |  |  |  |  | 10,000,000
Debt instrument, maximum borrowing capacity |  |  |  |  | $ 10,000,000
ASUS | Contracted Services |  |  |  |  |
Nature of Operations: |  |  |  |  |
Period of fixed price contracts to operate and maintain water systems at various military bases | 50 years |  |  |  |
Sales and Use Taxes: |  |  |  |  |
Period of fixed price contracts to operate and maintain water systems at various military bases | 50 years |  |  |  |
Fort Riley |  |  |  |  |
Nature of Operations: |  |  |  |  |
Period of fixed price contracts to operate and maintain water systems at various military bases |  |  | 50 years |  |
Sales and Use Taxes: |  |  |  |  |
Period of fixed price contracts to operate and maintain water systems at various military bases |  |  | 50 years |  |
Sales | GOLDEN STATE WATER COMPANY | Water Service Utility Operations |  |  |  |  |
Nature of Operations: |  |  |  |  |
Concentration Risk, Percentage | 90.00% | 90.00% |  |  |
Sales | GOLDEN STATE WATER COMPANY | Electric Service Utility Operations |  |  |  |  |
Nature of Operations: |  |  |  |  |
Concentration Risk, Percentage | 85.00% |  |  |  |
Minimum | Fort Riley |  |  |  |  |
Summary of significant accounting policies |  |  |  |  |
Period of Transition to Operate and Maintain Water Systems at New Military Base | 6 months |  |  |  |
Maximum | Fort Riley |  |  |  |  |
Summary of significant accounting policies |  |  |  |  |
Period of Transition to Operate and Maintain Water Systems at New Military Base | 12 months |  |  |  |

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