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Contingencies and Gain on Sale of Assets Loss Contingencies Number of Customer Served (Details) | Jun. 08, 2017 USD ($)
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Ojai Water System |
Loss Contingencies [Line Items] |
Loss contingency number of customers served | 2,900

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- Definition Represents the number of customers served by the entity. + References No definition available. + Details
Name: | awr_LossContingencyNumberOfCustomersServed
Namespace Prefix: | awr_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | duration

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- 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_LossContingenciesLineItems
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Details
Name: | us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsAxis=awr_OjaiWaterSystemMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |