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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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