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Business Segments: (Details)
$ in Thousands
3 Months Ended 9 Months Ended
Mar. 31, 2018
USD ($)
segment
Mar. 31, 2017
USD ($)
Sep. 30, 2017
Dec. 31, 2017
USD ($)
Details of reportable segment        
Total operating revenues $ 94,728 $ 98,810    
Operating income (loss) 18,691 24,576    
Interest expense, net 5,387 5,646    
Utility plant 1,218,830 1,137,159   $ 1,204,992
Depreciation and amortization expense 9,666 9,683    
Income tax expense (benefit) 2,564 6,855    
Capital additions $ 30,364 23,994    
AWR        
Details of reportable segment        
Number of reportable segments | segment 3      
GOLDEN STATE WATER COMPANY        
Details of reportable segment        
Public Utilities Property Plant and Equipment Depreciation on Transportation Equipment $ 60 61    
Number of reportable segments | segment 2      
Total operating revenues $ 74,244 76,906    
Operating income (loss) 16,297 21,876    
Utility plant 1,209,299     $ 1,197,940
Depreciation and amortization expense 9,334 9,438    
Income tax expense (benefit) $ 2,115 6,273    
Fort Riley [Member]        
Details of reportable segment        
Period of fixed price contracts to operate and maintain water systems at various military bases     50 years  
ASUS | Contracted Services        
Details of reportable segment        
Period of fixed price contracts to operate and maintain water systems at various military bases 50 years      
Reportable Legal Entities | GOLDEN STATE WATER COMPANY | Water Service Utility Operations        
Details of reportable segment        
Total operating revenues $ 64,412 66,404    
Operating income (loss) 14,058 19,097    
Interest expense, net 5,009 5,145    
Utility plant 1,149,038 1,075,513    
Depreciation and amortization expense 8,769 8,901    
Income tax expense (benefit) 1,649 5,485    
Capital additions 26,618 22,984    
Reportable Legal Entities | GOLDEN STATE WATER COMPANY | Electric Service Utility Operations        
Details of reportable segment        
Total operating revenues 9,832 10,502    
Operating income (loss) 2,239 2,779    
Interest expense, net 370 375    
Utility plant 60,261 56,015    
Depreciation and amortization expense 565 537    
Income tax expense (benefit) 466 788    
Capital additions 974 723    
Reportable Legal Entities | ASUS | Contracted Services        
Details of reportable segment        
Total operating revenues 20,484 21,904    
Operating income (loss) 2,397 2,704    
Interest expense, net (66) (74)    
Utility plant 9,531 5,631    
Depreciation and amortization expense 332 245    
Income tax expense (benefit) 554 861    
Capital additions 2,772 287    
Intersegment Eliminations | AWR        
Details of reportable segment        
Total operating revenues 0 0    
Operating income (loss) (3) (4)    
Interest expense, net 74 (52)    
Utility plant 0 0    
Depreciation and amortization expense 0 0    
Income tax expense (benefit) (105) (279)    
Capital additions $ 0 $ 0    
Minimum | Fort Riley [Member]        
Details of reportable segment        
Period of Transition to Operate and Maintain Water Systems at New Military Base 6 months      
Maximum | Fort Riley [Member]        
Details of reportable segment        
Period of Transition to Operate and Maintain Water Systems at New Military Base 12 months