XML 108 R92.htm IDEA: XBRL DOCUMENT v3.20.4

Commitments Commitments 2 (Details) - Bear Valley Electric Service, Inc.	12 Months Ended
	Dec. 31, 2020 unit
Purchase Commitment, Excluding Long-term Commitment [Line Items]
Number of renewable energy credits that would be purchased	578,000
Minimum
Purchase Commitment, Excluding Long-term Commitment [Line Items]
Derivative, Term of Contract	3 years
Maximum
Purchase Commitment, Excluding Long-term Commitment [Line Items]
Derivative, Term of Contract	5 years

X

- Definition

Represents the number of renewable energy credits that would be purchased over a contractual period of time.

+ References

No definition available.

+ Details

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

X

- Definition

Period the derivative contract is outstanding, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

+ References

No definition available.

+ Details

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

X

- Details

Name:	dei_LegalEntityAxis=awr_BearValleyElectricServiceIncMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	srt_RangeAxis=srt_MinimumMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	srt_RangeAxis=srt_MaximumMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type: