XML 52 R39.htm IDEA: XBRL DOCUMENT
v3.24.2.u1

Income Taxes: (Details) | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2024 | Jun. 30, 2023 | Jun. 30, 2024 | Jun. 30, 2023
GSWC |  |  |  |
Effective income tax rate |  |  |  |
ETRs ( as a percent) | 25.20% | 26.20% | 25.00% | 25.50%
Parent |  |  |  |
Effective income tax rate |  |  |  |
ETRs ( as a percent) | 24.50% | 25.50% | 24.40% | 24.70%

X
- Definition -- None. No documentation exists for this element. -- + References No definition available. + Details
Name: | awr_EffectiveIncomeTaxRateLineItems
Namespace Prefix: | awr_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Definition Percentage of current income tax expense (benefit) and deferred income tax expense (benefit) pertaining to continuing operations. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 740 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 12 -Publisher FASB -URI https://asc.fasb.org//1943274/2147482685/740-10-50-12 + Details
Name: | us-gaap_EffectiveIncomeTaxRateContinuingOperations
Namespace Prefix: | us-gaap_
Data Type: | dtr-types:percentItemType
Balance Type: | na
Period Type: | duration

X
- Details
Name: | dei_LegalEntityAxis=awr_GoldenStateWaterCompanyMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | srt_ConsolidatedEntitiesAxis=us-gaap_ParentMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |