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Military Privatization (Details) - Contracted services:	12 Months Ended
	Dec. 31, 2022
Military Privatization
Period of fixed price contracts to maintain water systems at various military bases	50 years
Number of Operating Segments	8

X

- Definition

Number of bases served with EPAs approved

+ References

No definition available.

+ Details

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Namespace Prefix:	awr_
Data Type:	xbrli:integerItemType
Balance Type:	na
Period Type:	duration

X

- Definition

Represents the period of fixed price contracts to operate and maintain the water and/or wastewater systems at various military bases.

+ References

No definition available.

+ Details

Name:	awr_PeriodOfFixedPriceContractsToMaintainWaterSystemsAtVariousMilitaryBases
Namespace Prefix:	awr_
Data Type:	xbrli:durationItemType
Balance Type:	na
Period Type:	duration

X

- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

+ References

No definition available.

+ Details

Name:	us-gaap_AccountsNotesAndLoansReceivableLineItems
Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

X

- Details

Name:	us-gaap_StatementBusinessSegmentsAxis=awr_ContractedServicesMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type: