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v3.25.1

Equity - Narrative (Details) $ in Millions | Apr. 29, 2022 USD ($)
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Equity [Abstract] |
Maximum consideration on transaction | $ 350.0
Sale of stock, agreement term | 3 years

X
- Definition Sale of Stock, Agreement Term + References No definition available. + Details
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Namespace Prefix: | cwt_
Data Type: | xbrli:durationItemType
Balance Type: | na
Period Type: | duration

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- Definition Sale of Stock, Maximum Consideration On Transaction + References No definition available. + Details
Name: | cwt_SaleOfStockMaximumConsiderationOnTransaction
Namespace Prefix: | cwt_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

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- References No definition available. + Details
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Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration