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Summary of Significant Accounting Policies: (Details) (USD $)	0 Months Ended	3 Months Ended		6 Months Ended				3 Months Ended		6 Months Ended				3 Months Ended		6 Months Ended						6 Months Ended	12 Months Ended
	May 20, 2013	Jun. 30, 2014	Jun. 30, 2013	Jun. 30, 2014 registrant	Jun. 30, 2013	May 31, 2013 AWR Promissory Note	Jun. 30, 2014 AWR Syndicated Credit Facility	Jun. 30, 2014 GSWC	Jun. 30, 2013 GSWC	Jun. 30, 2014 GSWC	Jun. 30, 2013 GSWC	Jun. 30, 2014 GSWC Purchase, production, distribution and sale of water customer	Jun. 30, 2014 GSWC Electricity distribution customer	Jun. 30, 2014 ASUS	Jun. 30, 2013 ASUS	Jun. 30, 2014 ASUS	Jun. 30, 2013 ASUS	Jun. 30, 2014 ASUS Contracts	May 23, 2013 Fourth Amendment to Revolving Credit Agreement AWR Syndicated Credit Facility	Jun. 30, 2014 6.87% Medium-Term Notes Series A GSWC	Jun. 30, 2014 7.00% Medium-Term Notes Series A GSWC	Jun. 30, 2014 Sales GSWC Purchase, production, distribution and sale of water	Jul. 15, 2015 Subsequent Event 6.87% Medium-Term Notes Series A GSWC
Nature of Operations:
Number of customers served												257,000	24,000
Percentage of total revenue																						90.00%
Period of fixed price contracts to operate and maintain the water and/or wastewater systems at various military bases																		50 years
Term of contract with US Military Bases				50 years
Basis of Presentation:
Number of registrants filing combined report				2
Stock split, conversion ratio	2
Related Party Transactions
Debt instrument, face amount						$ 20,000,000.0														$ 5,000,000	$ 10,000,000
Debt instrument, maximum borrowing capacity						20,000,000.0
Maximum borrowing capacity on line of credit							100,000,000												100,000,000.0
Long term debt
Rate of interest																				6.87%	7.00%
Debt instrument, face amount						20,000,000.0														5,000,000	10,000,000
Repurchase amount																							100.00%
Notes Payable to Banks:
Maximum borrowing capacity on line of credit							100,000,000												100,000,000.0
Maximum borrowing capacity on line of credit, potential election to increase																			50,000,000.0
Sales and Use Taxes:
Franchise fees billed to customers and recorded as operating revenue								975,000	947,000	1,800,000	1,800,000
Period of fixed price contracts to operate and maintain the water and/or wastewater systems at various military bases																		50 years
Non-income tax assessments accounted on a gross basis		$ 3,965,000	$ 3,748,000	$ 8,290,000	$ 7,896,000			$ 3,530,000	$ 3,375,000	$ 7,426,000	$ 7,091,000			$ 157,000	$ 169,000	$ 306,000	$ 331,000

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