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v3.19.3

Subsequent Event (Details) - Subsequent Event $ in Millions | Oct. 08, 2019 USD ($)
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Subsequent Event [Line Items] |
Current projects amount | $ 200.0
Advice letter authorizations | $ 148.0
Water main replacement rate | 0.76%
Minimum |
Subsequent Event [Line Items] |
New projects amount | $ 609.0
Capital investments | 809.0
Maximum |
Subsequent Event [Line Items] |
New projects amount | 628.0
Capital investments | $ 828.0

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- Definition Settlement Agreement, Advice Letter Authorizations + References No definition available. + Details
Name: | cwt_SettlementAgreementAdviceLetterAuthorizations
Namespace Prefix: | cwt_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

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- Definition Settlement Agreement, Capital Investments + References No definition available. + Details
Name: | cwt_SettlementAgreementCapitalInvestments
Namespace Prefix: | cwt_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

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- Definition Settlement Agreement, Current Projects Amount + References No definition available. + Details
Name: | cwt_SettlementAgreementCurrentProjectsAmount
Namespace Prefix: | cwt_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

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- Definition Settlement Agreement, New Projects Amount + References No definition available. + Details
Name: | cwt_SettlementAgreementNewProjectsAmount
Namespace Prefix: | cwt_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

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- Definition Settlement Agreement, Water Main Replacement Rate + References No definition available. + Details
Name: | cwt_SettlementAgreementWaterMainReplacementRate
Namespace Prefix: | cwt_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | instant

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- Definition Detail information of subsequent event by type. User is expected to use existing line items from elsewhere in the taxonomy as the primary line items for this disclosure, which is further associated with dimension and member elements pertaining to a subsequent event. + References No definition available. + Details
Name: | us-gaap_SubsequentEventLineItems
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Details
Name: | us-gaap_SubsequentEventTypeAxis=us-gaap_SubsequentEventMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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

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